Biophysics and Molecular Materials

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Strep-Tag II and Monovalent Strep-Tactin as Novel Handles in Single-Molecule Cut-and-Paste

Katherine R. Erlich, Fabian Baumann, Diana A. Pippig, and Hermann E. Gaub
Small Methods July 2017, DOI: 10.1002/smtd.201700169

Directed spatial assembly of single molecules on a surface presents an opportunity to precisely control the positioning, density, and geometry of molecules of interest within an ensemble. In contrast to bulk averaging, this enables detection and analysis of individual behavior within such a designed ensemble. The atomic force microscopy (AFM)-based technique of single-molecule cut-and-paste (SMC&P) facilitates the arrangement of a variety of biomolecules on a surface through different handling strategies...more  PDF



Increasing evidence of mechanical force as a functional regulator in smooth muscle myosin light chain kinase

Fabian Baumann, Magnus Sebastian Bauer, Martin Rees, Alexander Alexandrovich, Mathias Gautel, Diana Angela Pippig, Hermann Eduard Gaub,
eLIFE, 11 July 2017, DOI: 10.7554/eLife.26473.001

Mechanosensitive proteins are key players in cytoskeletal remodeling, muscle contraction, cell migration and differentiation processes. Smooth muscle myosin light chain kinase (smMLCK) is a member of a diverse group of serine/threonine kinases that feature cytoskeletal association. Its catalytic activity is triggered by a conformational change upon Ca2+/calmodulin (Ca2+/CaM) binding....more    PDF



Post-Translational Sortase-Mediated Attachment of High-Strength
Force Spectroscopy Handles

Ellis Durner, Wolfgang Ott, Michael A. Nash and Hermann E. Gaub, ACS Omega, 30 June 2017, DOI: 10.1021/acsomega.7b00478

Single-molecule force spectroscopy greatly benefits from site-specific surface immobilization and specific probing with a functionalized cantilever.Here, we describe a streamlined approach to such experiments by covalently attaching mechanically stable receptors onto proteins of interest (POI) to improve pickup efficiency and specificity. This platform provides improved throughput, allows precise control over the pulling geometry, and allows for multiple constructs to be probed with the same ligand-modified cantilever...more    PDF



Elastin-like Polypeptide Linkers for Single-Molecule Force Spectroscopy

Wolfgang Ott, Markus A. Jobst, Magnus S. Bauer, Ellis Durner, Lukas F. Milles, Michael A. Nash, and Hermann E. Gaub, ACS Nano, 7 June  2017, DOI: 10.1021/acsnano.7b02694

Single-molecule force spectroscopy (SMFS) is by now well established as a standard technique in biophysics and mechanobiology. In recent years, the technique has benefitted greatly from new approaches to bioconjugation of proteins to surfaces. Indeed, optimized immobilization strategies for biomolecules and refined purification schemes are being steadily adapted and improved, which in turn has enhanced data quality. In many previously reported SMFS studies, poly(ethylene glycol) (PEG) was used to anchor molecules of interest to surfaces and/or cantilever tips. The limitation, however, is that PEG exhibits a well-known trans−trans−gauche to all-trans transition, ... more   PDF


grafik science perspectiveMembrane proteins scrambling through a folding landscape

Daniel J. Müller and Hermann E. Gaub, Science Perspective, 3 March 2017 • VOL 355 ISSUE 6328, doi: 10.1126/science.aam8370.

Single-molecule force spectroscopy (SMFS) measures the extension of a molecule when subjected to force. The folding of a protein can be explored by pulling on one terminus to unfold it; upon relaxation, it may refold toward its native states. Transmembrane proteins typically unfold stepwise as structural segments (which can consist of parts of single or multiple secondary structures) are extracted from the membrane (see the figure, top panel). Once extracted, the unfolded segment can insert back into the membrane and fold toward the native protein structure. Complex proteins extracted from the membrane may refold back into the membrane but tend to misfold and require the assistance of chaperones, insertases, or both... more   PDF


grafik nat matAtomic force microscopy-based characterization and design of biointerfaces

David Alsteens, Hermann E. Gaub, Richard Newton, Moritz Pfreundschuh, Christoph Gerber and Daniel J. Müller, Nature Reviews,
doi: 10.1038/natrevmats.2017.8, Published online 14 Mar 2017,

Atomic force microscopy (AFM)-based methods have matured into a powerful nanoscopic platform, enabling the characterization of a wide range of biological and synthetic biointerfaces ranging from tissues, cells, membranes, proteins, nucleic acids and functional materials. Although the unprecedented signal-to-noise ratio of AFM enables the imaging of biological interfaces from the cellular to the molecular scale, AFM-based force spectroscopy allows their mechanical, chemical, conductive or electrostatic, and biological properties to be probed... more   PDF


loef2017jcp_figweb_kleinA Biophysical View on von Willebrand Factor Activation

Achim Löf, Jochen P. Müller, and Maria A. Brehm, Journal of Cellular Physiology,
doi: 10.1002/jcp.25887, March 2017

The process of hemostatic plug formation at sites of vascular injury crucially relies on the large multimeric plasma glycoprotein von Willebrand factor (VWF) and its ability to recruit platelets to the damaged vessel wall via interaction of its A1 domain with platelet GPIbα. Under normal blood flow conditions, VWF multimers exhibit a very low binding affinity for platelets. Only when subjected to increased hydrodynamic forces, which primarily occur in connection with vascular injury, VWF can efficiently bind to platelets. This force-regulation of VWF’s hemostatic activity is not only highly intriguing from a biophysical perspective, but also of eminent physiological importance...  more  PDF



loef_aibr017_figwebsiteBiophysical approaches promote advances in the understanding of von Willebrand factor processing and function

Löf A., Müller J.P., Benoit M., Brehm M.A., Advances in Biological Regulation 2017, Vol 63, pages 81-91.

The large multimeric plasma glycoprotein von Willebrand factor (VWF) is essential for primary hemostasis by recruiting platelets to sites of vascular injury. VWF multimers respond to elevated hydrodynamic forces by elongation, thereby increasing their adhesiveness to platelets. Thus, the activation of VWF is force-induced, as is its inactivation. Due to these attributes, VWF is a highly interesting system from a biophysical point of view, and is well suited for investigation using biophysical approaches. Here, we give an overview on recent studies that predominantly employed biophysical methods to gain novel insights into multiple aspects of VWF: Electron microscopy was used to shed light on the domain structure of VWF and the mechanism of VWF secretion... more   PDF




homepage_figure_millesMechanical Stability of a High-Affinity Toxin Anchor from the Pathogen Clostridium perfringens

Lukas F. Milles, Edward. A. Bayer, Michael A. Nash, Hermann E. Gaub, Journal of Physical Chemistry B - Klaus Schulten Memorial Issue, doi: 10.1021/acs.jpcb.6b09593, November 2016

The opportunistic pathogen Clostridium perfringens assembles its toxins and carbohydrate-active enzymes by the high-affinity cohesin-dockerin (Coh-Doc) interaction. Coh–Doc interactions characterized previously have shown considerable resilience toward mechanical stress. Here, we aimed to determine the mechanics of this interaction from C. perfringens in the context of a pathogen. Using atomic force microscopy based single-molecule force spectroscopy (AFM-SMFS) we probed the mechanical properties of the interaction of a dockerin from the μ-toxin with the GH84C X82 cohesin domain of C. perfringens. Most probable complex rupture forces were found to be approximately 60 pN... more   PDF



2016_schoelerBiasing effects of receptor-ligand complexes on protein-unfolding statistics

Constantin Schoeler, Tobias Verdorfer, Hermann E. Gaub, and Michael A. Nash, Physical Review, Vol. 94, Iss. 4, DOI:, October 2016

Protein receptor-ligand pairs are increasingly used as specific molecular handles in single-molecule protein-unfolding experiments. Further, known marker domains, also referred to as fingerprints, provide unique unfolding signatures to identify specific single-molecule interactions, when receptor-ligand pairs themselves are investigated...  more  PDF



2017_nanoscaleNanoscale Engineering of Designer Cellulosomes

Melissabye Gunnoo, Pierre-André Cazade, Albert Galera-Prat, Michael A. Nash,
Mirjam Czjzek, Marek Cieplak, Beatriz Alvarez , Marina Aguilar, Alon Karpol,
Hermann Gaub, Mariano Carrión-Vázquez, Edward A. Bayer, and Damien Thompson, Advanced Materials, 2016, 28, 5619–5647
doi: 10.1002/adma.201503948, Juli 2016

Biocatalysts showcase the upper limit obtainable for high-speed molecular processing and transformation. Efforts to engineer functionality in synthetic nanostructured materials are guided by the increasing knowledge of evolving architectures, which enable controlled molecular motion and precise molecular recognition. The cellulosome is a biological nanomachine, which, as a fundamental component of the plant-digestion machinery from bacterial cells, has a key potential role in the successful development of environmentally-friendly processes to produce biofuels and fine chemicals from the breakdown of biomass waste. Here, the progress toward so-called “designer cellulosomes”, which provide an elegant alternative to enzyme cocktails for lignocellulose breakdown, is reviewed.... more   PDF


muellerloefpH-Dependent Interactions in Dimers Govern the Mechanics and Structure of von Willebrand Factor

Jochen P. Müller, Achim Löf, Salomé Mielke, Tobias Obser, Linda K. Bruetzel, Willem Vanderlinden, Jan Lipfert, Reinhard Schneppenheim, and Martin Benoit, Biophysical Journal, Volume 111, Issue 2, Pages 312–322, doi:10.1016/j.bpj.2016.06.022, 26 July 2016,

Von Willebrand factor (VWF) is a multimeric plasma glycoprotein that is activated for hemostasis by increased hydrodynamic forces at sites of vascular injury. Here, we present data from atomic force microscopy-based single-molecule force measurements, atomic force microscopy imaging, and small-angle x-ray scattering to show that the structure and mechanics of VWF are governed by multiple pH-dependent interactions with opposite trends within dimeric subunits. In particular, the recently discovered strong intermonomer interaction, which induces a firmly closed conformation of dimers and crucially involves the D4 domain...  more  PDF




Sequence-Independent Cloning and Post-Translational Modification
of Repetitive Protein Polymers through Sortase and Sfp-Mediated
Enzymatic Ligation

Wolfgang Ott, Thomas Nicolaus, Hermann E. Gaub, and Michael A. Nash
Biomacromolecules, doi:10.1021/acs.biomac.5b01726, March 2016

Repetitive protein-based polymers are important for many applications in biotechnology and biomaterials development. Here we describe the sequential additive ligation of highly repetitive DNA sequences, their assembly into genes encoding protein–polymers with precisely tunable lengths and compositions, and their end-specific post-translational modification with organic dyes and fluorescent protein domains. Our new Golden Gate-based cloning approach relies on incorporation of only type IIS BsaI restriction enzyme recognition sites using PCR, which allowed us to install ybbR-peptide tags, Sortase c-tags, and cysteine residues... more   PDF




Enzyme- and affinity biomolecule-mediated polymerization systems for biological signal amplification and cell screening

Klara H. Malinowska, Michael A. Nash
Current Opinion in Biotechnology, doi:10.1016/j.copbio.2016.01.007, February 2016

Enzyme-mediated polymerization and polymerization-based signal amplification have emerged as two closely related techniques that are broadly applicable in the nanobio sciences. We review recent progress on polymerization systems mediated by biological molecules (e.g., affinity molecules and enzymes), and highlight newly developed formats and configurations of these systems to perform such tasks as non-instrumented biodetection, synthesis of core–shell nanomaterials, isolation of rare cells, and high-throughput screening... more   PDF




Single-molecule force spectroscopy on polyproteins and receptor–ligand complexes: The current toolbox

Wolfgang Ott, Markus A. Jobst, Constantin Schoeler, Hermann E. Gaub, Michael A. Nash
Journal of Structural Biology, doi:10.1016/j.jsb.2016.02.011, February 2016

Single-molecule force spectroscopy sheds light onto the free energy landscapes governing protein folding and molecular recognition. Since only a single molecule or single molecular complex is probed at any given point in time, the technique is capable of identifying low-probability conformations within a large ensemble of possibilities. It furthermore allows choosing certain unbinding pathways through careful selection of the... more   PDF 




Force sensing by the vascular protein von Willebrand factor is tuned by a strong intermonomer interaction

Jochen P. Müller, Salomé Mielke, Achim Löf, Tobias Obser, Christof Beer, Linda K. Bruetzel, Diana A. Pippig, Willem Vanderlinden, Jan Lipfert, Reinhard Schneppenheim, Martin Benoit
PNAS, doi: 10.1073/pnas.1516214113, January 2016

The large plasma glycoprotein von Willebrand factor (VWF) senses hydrodynamic forces in the bloodstream and responds to elevated forces with abrupt elongation, thereby increasing its adhesiveness to platelets and collagen. Remarkably, forces on VWF are elevated at sites of vascular injury, where VWF’s hemostatic potential is important to mediate platelet aggregation and to recruit platelets to the subendothelial layer... more   PDF 



2015_elife_jobst3_miniResolving dual binding conformations of cellulosome cohesin-dockerin complexes using single-molecule force spectroscopy

Markus A. Jobst, Lukas F. Milles, Constantin Schoeler, Wolfgang Ott, Daniel B. Fried, Edward A. Bayer, Hermann E. Gaub & Michael A. Nash
eLife, DOI:10.7554/eLife.10319.001, October 2015

Receptor-ligand pairs are ordinarily thought to interact through a lock and key mechanism, where a unique molecular conformation is formed upon binding. Contrary to this paradigm, cellulosomal cohesin-dockerin (Coh-Doc) pairs are believed to interact through redundant dual binding modes consisting of two distinct conformations. Here, we combined site- directed mutagenesis and single-molecule force spectroscopy (SMFS) to study the unbinding of Coh:Doc complexes under force. We designed Doc mutations to knock out each binding mode, and compared their single-molecule unfolding patterns as they were dissociated from... more   PDF



ediz1Decoding Cytoskeleton-Anchored and Non-Anchored Receptors from Single-Cell Adhesion Force Data

Ediz Sariisik, Cvetan Popov, Jochen P. Müller, Denitsa Docheva, Hauke Clausen-Schaumann and Martin Benoit
Biophys J. 2015 Oct 6;109(7):1330-3. doi: 10.1016/j.bpj.2015.07.048

Complementary to parameters established for cell-adhesion force curve analysis, we evaluated the slope before a force step together with the distance from the surface at which the step occurs and visualized the result in a two-dimensional density plot. This new tool allows detachment steps of long membrane tethers to be distinguished from shorter jumplike force steps.... more   PDF



2015_monovalentMonovalent Strep-Tactin for strong and site-specific tethering in nano spectroscopy

Fabian Baumann, Magnus S. Bauer, Lukas F. Milles, Alexander Alexandrovich, Hermann E. Gaub & Diana A. Pippig
Nature Nanotechnology, doi:10.1038/nnano.2015.231, October 2015

Strep-Tactin, an engineered form of streptavidin, binds avidly to the genetically encoded peptide Strep-tag II in a manner comparable to streptavidin binding to biotin. These interactions have been used in protein purification and detection applications. However, in single-molecule studies, for example using atomic force microscopy-based single-molecule force spectroscopy (AFM-SMFS), the tetravalency of these systems... more   PDF



2015-klameckaEnergy profile of nanobody-GFP complex under force

Kamila Klamecka, Philip M Severin, Lukas F. Milles, Hermann E. Gaub & Heinrich Leonhardt
Physical Biology, Volume 12, Number 5, doi:10.1088/1478-3975/12/5/056009, September 2015

Nanobodies (Nbs)-the smallest known fully functional and naturally occuring antigen-binding fragments-have attracted a lot of attention throughout the last two decades. Exploring their potential beyond the current use requires more detailed characterization of their binding forces as those cannot be directly derived from the binding affinities. Here we used atomic force microscope to measure rupture force of the Nb-green fluorescent protein (GFP) complex in various pulling geometries and derived the energy profile characterizing the interaction along the direction of the pulling force.... more   PDF



nanolettcover_smallMapping Mechanical Force Propagation through Biomolecular Complexes

Constantin Schoeler, Rafael C. Bernardi, Klara H. Malinowska, Ellis Durner, Wolfgang Ott, Edward A. Bayer, Klaus Schulten, Michael A. Nash, and Hermann E. Gaub
Nano Lett., doi:10.1021/acs.nanolett.5b02727, August 2015

Here we employ single-molecule force spectroscopy with an atomic force microscope (AFM) and steered molecular dynamics (SMD) simulations to reveal force propagation pathways through a mechanically ultrastable multidomain cellulosome protein complex. We demonstrate a new combination of network-based... more   PDF





2015-analchem-malinowskaQuantifying Synergy, Thermostability, and Targeting of Cellulolytic Enzymes and Cellulosomes with Polymerization-Based Amplification

Klara H. Malinowska, Thomas Rind , Tobias Verdorfer, Hermann E. Gaub , and Michael A. Nash
Anal. Chem.; doi:10.1021/acs.analchem.5b00936, June 2015

We present a polymerization-based assay for determining the potency of cellulolytic enzyme formulations on pretreated biomass substrates. Our system relies on monitoring the autofluorescence of cellulose and measuring the... more   PDF




2015-chemphyschem-aschenbrennerC-5 Propynyl Modifications Enhance the Mechanical Stability of DNA

Daniela Aschenbrenner, Fabian Baumann, Lukas F. Milles, Dr. Diana A. Pippig, and Hermann E. Gaub
ChemPhysChem; doi:10.1002/cphc.201500193, May 2015

Increased thermal or mechanical stability of DNA duplexes is desired for many applications in nanotechnology or -medicine where DNA is used as a programmable building block. Modifications of pyrimidine bases are known to enhance thermal stability and have the advantage of standard base-pairing and... more   PDF






baumann_2015_rsiTip localization of an atomic force microscope in transmission microscopy with nanoscale precision

Fabian Baumann, Stephan F. Heucke, Diana A. Pippig and Hermann E. Gaub
Rev. Sci. Instrum.;, March 2015

Since the atomic force microscope (AFM) has evolved into a general purpose platform for mechanical experiments at the nanoscale, the need for a simple and generally applicable localization of the AFM cantilever in the reference frame of an optical microscope has grown. Molecular manipulations... more   PDF



2014-plosone-aschenbrennerParallel Force Assay for Protein-Protein Interactions

Daniela Aschenbrenner, Diana A. Pippig , Kamila Klamecka, Katja Limmer, Heinrich Leonhardt, Hermann E. Gaub
PLOSone, doi:10.1371/journal.pone.0115049, December 2014

Quantitative proteome research is greatly promoted by high-resolution parallel format assays. A characterization of protein complexes based on binding forces offers an unparalleled dynamic range and allows for the effective discrimination of non-specific interactions. Here we present a DNA-based Molecular Force Assay to quantify... more   PDF



ncomm2014Ultrastable cellulosome-adhesion complex tightens under load

Constantin Schoeler, Klara H. Malinowska, Rafael C. Bernardi, Lukas F. Milles, Markus A. Jobst, Ellis Durner, Wolfgang Ott, Daniel B. Fried, Edward A. Bayer, Klaus Schulten, Hermann E. Gaub & Michael A. Nash
Nature Communications, doi:10.1038/ncomms6635, December 2014

Challenging environments have guided nature in the development of ultrastable protein complexes. Specialized bacteria produce discrete multi-component protein networks called cellulosomes to effectively digest lignocellulosic biomass. While network assembly is enabled by protein interactions with ... more   PDF




From genes to protein mechanics on a chip

Marcus Otten, Wolfgang Ott, Markus A Jobst, Lukas F Milles, Tobias Verdorfer, Diana A Pippig, Michael A Nash & Hermann E Gaub
Nature Methods, doi:10.1038/nmeth.3099, September 2014

Single-molecule force spectroscopy enables mechanical testing of individual proteins, but low experimental throughput limits the ability to screen constructs in parallel. We describe a microfluidic platform for on-chip expression, covalent surface attachment and measurement of single-molecule protein mechanical ... more   PDF




Redox-Initiated Hydrogel System for Detection and Real- Time Imaging of Cellulolytic Enzyme Activity

Klara H. Malinowska, Tobias Verdorfer, Aylin Meinhold, Lukas F. Milles, Victor Funk, Hermann E. Gaub, and Michael A. Nash
ChemSusChem, doi:10.1002/cssc.201402428, August 2014

A hydrogel reagent signaling (HyReS) system converts oligosaccharides produced during biomass hydrolysis into a fluorescent hydrogel. This system for assaying cellulolytic enzyme activity serves as a versatile platform on both soluble and insoluble substrates. When combined with total internal reflection fluorescence microscopy, it provides a spatially resolved method for chemical imaging of .... more   PDF





Functionalization of Cantilever Tips with Nucleotides by
the Phosphoramidite Method

Ralf David, Matthias Erdmann, Ann R. Fornof, and Hermann E. Gaub
ChemMedChem 2014, 9, 2049 – 2051, DOI: 10.1002/cmdc.201402165, July 2014

In atomic force microscopy (AFM) a sharp cantilever tip is used to scan surfaces at the atomic level. One further application is force spectroscopy, in which force–distance curves between binding partners located on the cantilever and substrate surface are determined. This requires specifically immobilized molecules. Herein we describe the covalent binding of single adenosine and thymidine nucleotides on an amino-PEGylated cantilever tip by the phosphoramidite method. Force–distance curves between these cantilever tips and gold surfaces were recorded....more   PDF




Protein–DNA Chimeras for Nano Assembly

Diana A. Pippig, Fabian Baumann, Mathias Strackharn, Daniela Aschenbrenner and Hermann E. Gaub
ACS Nano, Article ASAP, DOI:10.1021/nn501644w, June 2014

In synthetic biology, “understanding by building” requires exquisite control of the molecular constituents and their spatial organization. Site-specific coupling of DNA to proteins allows arrangement of different protein functionalities with emergent properties by self-assembly on origami-like DNA scaffolds  .... more   PDF





Detection of Thermoresponsive Polymer Phase Transition in Dilute Low-Volume Format by Microscale Thermophoretic Depletion

M. Wolff, D. Braun and M.A. Nash
Anal. Chem., DOI:10.1021/ac5008283, May 2014

Environmentally responsive polymers are becoming increasingly important in the biomaterials field for use as diagnostic reagents, drug carriers, and tissue engineering scaffolds. Characterizing polymer phase transitions by cloud point curves typically requires large milliliter volumes of sample at high micromolar solution concentrations. Here we present a method based on quantification of thermophoretic Soret diffusion that allows determination of polymer phase transitions using only 1 μL of liquid at dilute nanomolar concentrations, effectively reducing the amount of sample required by a factor of 106. We prepared an  .... more   PDF





A Force-Based, Parallel Assay for the Quantification of Protein-DNA Interactions

Katja Limmer, Diana A. Pippig, Daniela Aschenbrenner, Hermann E. Gaub
PLOS ONE, DOI: 10.1371/journal.pone.0089626, February 2014

Analysis of transcription factor binding to DNA sequences is of utmost importance to understand the intricate regulatory mechanisms that underlie gene expression. Several techniques exist that quantify DNA-protein affinity .... more   PDF



Placing individual molecules in the center of nanoapertures

Heucke S.F., Baumann F., Acuna G.P., Severin P., Stahl S.W., Strackharn M., Stein I., Altpeter P., Tinnefeld P. and Gaub H.E.
Nano Letters, Volume 14, Issue 2, DOI: 10.1021/nl401517a, February 2014

While nanophotonic devices are unfolding their potential for single-molecule fluorescence studies, metallic quenching and steric hindrance, occurring within these structures, raise the desire for site-specific immobilization of the molecule of interest. Here, we refine the single-molecule cut-and-paste technique by optical superresolution routines to immobilize single fluorescent molecules in the center of nanoapertures. By comparing their fluorescence lifetime and intensity to stochastically immobilized fluorophores, we characterize the .... more   PDF




jove_2013Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy

Markus A. Jobst, Constantin Schoeler, Klara Malinowska, Michael A. Nash
JoVE, DOI: 10.3791/50950, 20 December 2013

Cellulosomes are multienzyme complexes designed for digesting cellulose. AFM-based SMFS was used to study the mechanical properties and folding .... more   PDF



uta_bioj_2013Stamping Vital Cells—a Force-Based Ligand Receptor Assay

Uta Wienken and Hermann E. Gaub
Biophysical Journal, Volume 105, Issue 12, 2687-2694, 17 December 2013

Gaining information about receptor profiles on cells, and subsequently finding the most efficient ligands for these signaling receptors, remain challenging tasks in stem cell and cancer research as well as drug development. We introduce a live-cell method .... more   PDF


cataractIncrease in lens capsule stiffness caused by vital dyes

Christos Haritoglou, MD, Stephan Mauell, MSc, Ricarda G. Schumann, MD, Paul B. Henrich, MD, Armin Wolf, MD, Marcus Kernt, MD, Martin Benoit, PhD
J Cataract Refract Surg 2013; 39:1749–1752 Q 2013 ASCRS and ESCRS, doi:10.1016/j.jcrs.2013.02.057

Cataract surgery was among the first ophthalmic surgical procedures in which dyes were introduced to assist the surgeon in more challenging cases, such as eyes with mature cataract. In mature white cataracts, a controlled capsulorhexis of the anterior capsule is often difficult to performdue to absence of the red fundus reflex. .... more   PDF


exponentialExponential size distribution of von Willebrand factor.

Lippok S, Obser T, Müller JP, Stierle VK, Benoit M, Budde U, Schneppenheim R, Rädler JO.
Biophys J. 2013 Sep 3;105(5):1208-16. doi: 10.1016/j.bpj.2013.07.037.

Von Willebrand Factor (VWF) is a multimeric protein crucial for hemostasis. Under shear flow, it acts as a mechanosensor responding with a size-dependent globule-stretch transition to increasing shear rates. Here, we quantify for the first time, to our knowledge, the size distribution of recombinant VWF and VWF-eGFP using a multilateral approach that involves quantitative gel analysis, fluorescence correlation spectroscopy, and total internal reflection fluorescence microscopy... more   PDF



eye2013Vital dyes increase the rigidity of the internal limiting membrane

Haritoglou C, Mauell S, Benoit M, Schumann RG, Henrich PB, Wolf A and Kampik A
Eye advance online publication, 16 August 2013; doi:10.1038/eye.2013.178

To assess the stiffness of the natural human internal limiting membrane (ILM) and evaluate potential changes of the mechanical properties following staining with brilliant blue (BB) and indocyanine green (ICG).
Methods Unstained ILM specimens were obtained during ophthalmic surgical procedures. After removal, the specimens were dissected into five parts. .... more   PDF


otten_toc_2Protein-DNA force assay in a microfluidic format

Otten M., Wolf P. and Gaub H.E.
Lab Chip, DOI: 10.1039/C3LC50830G, Aug. 2013

The detailed study of protein–DNA interactions is a core effort to elucidate physiological processes, including gene regulation, DNA repair and the immune response. The molecular force .... more   PDF


limmer_paper_01 2013Sequence-specific inhibition of Dicer measured with a force-based microarray for RNA ligands

Limmer K., Aschenbrenner D. and Hermann Gaub H.E.
Nucleic Acids Research,  Vol. 41, No. 6 e69, doi:10.1093/nar/gks1455 (2013)

Malfunction of protein translation causes many severe diseases, and suitable correction strategies may become the basis of effective therapies. One major regulatory element of protein translation is the nuclease Dicer that cuts double-stranded RNA.....more   PDF


heuckeijnthoch2013Nanoapertures for AFM-Based Single-Molecule Force Spectroscopy

Heucke S.F., Puchner E.M., Stahl S.W., Holleitner A.W., Gaub H.E. and Tinnefeld P.
Int. J. Nanotechnology 10, No. 5/6/7, 607–619 (2013)

Simultaneous single-molecule force spectroscopy and microfluorescence binding measurements are often hampered by background fluorescence from the bulk. Zero-Mode Waveguides (ZMW) restrict the excited volume but require a spectial design, which allows the tip of the force probing cantilever to protrude into....... more   PDF


severin_bj_2013 Effects of Cytosine Hydroxymethylation on DNA Strand Separation

Philip M. D. Severin, Xueqing Zou, Klaus Schulten and Hermann E. Gaub
Biophysical Journal, Volume 104 January 2013 208–215, DOI: 10.1016/j.bpj.2012.11.013

Cytosine hydroxymethylation is an epigenetic control factor in higher organisms. New discoveries of the biological roles of hydroxymethylation serve to raise questions about how this epigenetic modification exerts its functions and how organisms discriminate cytosine hydroxymethylation from methylation...........more   PDF



nanoscale_pippig_strackharnNanoscale arrangement of proteins by Single-Molecule Cut & Paste

Strackharn M., Pippig D.A., Meyer P., Stahl S.W., Gaub H.E.
JACS, 134(37), 15193-6 (2012)

Protein-based nanostructures are key to the organization of life and it is their precise arrangement, which determines their specific functions. A single-molecule approach for the directed assembly of protein arrangements allows for a controlled composition of systems based on protein components. Applying antibodies and .......more   PDF



Single-Molecule Adhesion of a Stimuli-Responsive Oligo(ethylene glycol)
Copolymer to Gold

Michael A. Nash and Hermann E. Gaub
ACS Nano, 6 (12), pp 10735–10742 (2012)

Adhesion of environmentally responsive polymers to biocompatible surfaces is an important issue that has been explored in several nanobiotechnology.......more   PDF







12 Severin Small-1-1DNA–Protein Binding Force Chip

Philip M. D. Severin and Hermann E. Gaub
Nano Micro Small 8, No. 21, 3269–3273 (2012)

Force measurements provide new fundamental and complementary information on biomolecular interactions, particularly in the high and low affi nity regimes, which may hardly be obtained otherwise..............more   PDF



stahl_cohdoc-02-01Single-molecule dissection of the high-affinity cohesin–dockerin complex

Stefan W. Stahl, Michael A. Nash, Daniel B. Fried, Michal Slutzki, Yoav Barak, Edward A. Bayer and Hermann E. Gaub
PNAS 109 , No. 50, 20431–20436 (2012)

Cellulose-degrading enzyme systems are of significant interest from both a scientific and technological perspective due to the diversity of cellulase families, their unique.....more   PDF



bild puchner et alSingle-Molecule Mechanoenzymatics

Elias M. Puchner and Hermann E. Gaub
Annual Review Biophysics 41, 497-518 (2012)

The ability of cellular signaling networks to sense, process, and respond to internal and external stimuli relies on their specific detection and trans- duction based on molecular recognition. The molecular mechanisms by which force ............. more   PDF




strackharn nanoletters_2012

Functional Assembly of Aptamer Binding Sites by Single-MoleculeCut-and-Paste

Mathias Strackharn, Stefan W. Stahl, Elias M. Puchner and Hermann E. Gaub
Nano Lett. 12, 2425-2428 (2012)

Bottom up assembly of functional molecular ensembles with novel properties emerging from composition and arrangement of ......more   PDF

pastedgraphic-2Peptide–Antibody Complex as Handle for Single-Molecule Cut & Paste

Mathias Strackharn, Stefan W. Stahl, Philip M. D. Severin, Thomas Nicolaus and Hermann E. Gaub
ChemPhysChem, 13, Issue 4, 914–917 (2012)

Feynman is frequently quoted for having foreseen that individ- ual atoms may be arranged one-by-one to form functional as- semblies. The seminal work by Don Eigler and colleagues convincingly proved the validity of these concepts...........more   PDF



Severin PMD, Ho D, Gaub HE (2011).
A high throughput molecular force assay for protein-DNA interactions.
Lab on a Chip, 11 (5):856-862.

Dufrene YF, Evans E, Engel A, Helenius J, Gaub HE, Muller DJ (2011).
Five challenges to bringing single-molecule force spectroscopy into living cells.
Nature Methods, 8 (2):123-127.

Erdmann M, David R, Fornof AR, Gaub HE (2011).
Electric Glue: Electrically Controlled Polymer-Surface Adhesion.
Nano Letters, 11 (5):1993-1996.

Stahl SW, Puchner EM, Alexandrovich A, Gautel M, Gaub HE (2011).
A conditional gating mechanism assures the integrity of the molecular force-sensor titin kinase.
Biophys J., 101 (8):1978-86."

Te Riet J, Katan AJ, Rankl C, Stahl SW, van Buul AM, Phang IY, Gomez-Casado A, Schön P, Gerritsen JW, Cambi A, Rowan AE, Vancso GJ, Jonkheijm P, Huskens J, Oosterkamp TH, Gaub H, Hinterdorfer P, Figdor CG, Speller S. (2011).
Interlaboratory round robin on cantilever calibration for AFM force spectroscopy.
Ultramicroscopy, 111(12):1659-1669.

Pippig DA, Heucke SF, Klamecka K, Kufer SK, Severin PM, Stahl SW, Strackharn M, Gaub HE (2011)
Single molecule cut and paste for protein based functional assembly.
European Biophysics Journal with Biophysics Letters, 40:p. 221-221

Severin Philip M. D., Zou Xueqing, Gaub Hermann E., et al. (2011).
Cytosine methylation alters DNA mechanical properties.
Nucleic Acids Research, 39 (20):8740-8751

Puchner EM, Gaub HE (2010).
Exploring the Conformation-Regulated Function of Titin Kinase by Mechanical Pump and Probe Experiments with Single Molecules.
Angewandte Chemie-International Edition, 49 (6):1147-1150.

Erdmann M, David R, Fornof A, Gaub HE (2010).
Electrically controlled DNA adhesion.
Nature Nanotechnology, 5 (2):154-159.

Cordes T, Strackharn M, Stahl SW, Summerer W, Steinhauer C, Forthmann C, Puchner EM, Vogelsang J, Gaub HE, Tinnefeld P (2010).
Resolving Single-Molecule Assembled Patterns with Superresolution Blink-Microscopy.
Nano Letters 10 (2):645-651.

Erdmann M, David R, Fornof AR, Gaub HE (2010).
Electrically induced bonding of DNA to gold.
Nature Chemistry, 2 (9):745-749.

Puchner EM, Gaub HE, Editor(s) Graslund A, Rigler R, Widengren J, (2010).
Mechanoenzymatics and Nanoassembly of Single Molecules.
Single Molecule Spectroscopy in Chemistry, Physics and Biology p:289-303.

Vogelsang J, Cordes T, Forthmann C, Steinhauer C, Tinnefeld P (2010).
Intrinsically Resolution Enhancing Probes for Confocal Microscopy.
Nano Letters, 10(2):672-679.

Cordes T, Vogelsang J, Anaya M, Spagnuolo C, Gietl A, Summerer W, Herrmann A, Mullen K, Tinnefeld P (2010).
Single-Molecule Redox Blinking of Perylene Diimide Derivatives in Water.
Journal of the American Chemical Society, 132(7):2404-2409.

Spalthoff C, Egelhaaf M, Tinnefeld P, Kurtz R (2010).
Localized direction selective responses in the dendrites of visual interneurons of the fly.
BMC Biology, 8 Art No. 36.

Kasper R, Harke B, Forthmann C, Tinnefeld P, Hell SW, Sauer M (2010).
Single-Molecule STED Microscopy with Photostable Organic Fluorophores.
Small, 6(13):1379-1384.

Vogelsang J, Steinhauer C, Forthmann C, Stein IH, Person-Skegro B, Cordes T, Tinnefeld P (2010).
Make them Blink: Probes for Super-Resolution Microscopy.
Chemphyschem, 11(12):2475-2490.

Jungmann R, Steinhauer C, Scheible M, Kuzyk A, Tinnefeld P, Simmel FC (2010).
Single-Molecule Kinetics and Super-Resolution Microscopy by Fluorescence Imaging of Transient Binding on DNA Origami
Nano Letters, 10(11):4756-4761.

Kufer SK, Strackharn M, Stahl SW, Gumpp H, Puchner EM, Gaub HE (2009).
Optically monitoring the mechanical assembly of single molecules.
Nature Nanotechnology 4 (1):45-49.

Ho D, Falter K, Severin P, Gaub HE (2009).
DNA as a Force Sensor in an Aptamer-Based Biochip for Adenosine.
Analytical Chemistry 81 (8):3159-3164.

Ho D, Dose C, Albrecht CH, Severin P, Falter K, Dervan PB, Gaub HE (2009).
Quantitative Detection of Small Molecule/DNA Complexes Employing a Force-Based and Label-Free DNA-Microarray.
Biophysical Journal 96 (11):4661-4671.

Gumpp H, Stahl SW, Strackharn M, Puchner EM, Gaub HE (2009).
Ultrastable combined atomic force and total internal fluorescence microscope.
Review of Scientific Instruments 80 (6): Art No. 063704.

Stahl SW, Puchner EM, Gaub HE (2009).
Photothermal cantilever actuation for fast single-molecule force spectroscopy.
Review of Scientific Instruments, 80(7):Art No. 073702.

Gumpp H, Puchner EM, Zimmermann JL, Gerland U, Gaub HE, Blank K (2009).
Triggering Enzymatic Activity with Force.
Nano Letters 9 (9):3290-3295.

Gaub BM, Kaul C, Zimmermann JL, Carell T, Gaub HE (2009).
Switching the mechanics of dsDNA by Cu salicylic aldehyde complexation.
Nanotechnology, 20 (43): Art No. 434002.

Gumpp H, Stahl SW, Strackharn M, Puchner EM, Gaub HE (2009).
Ultrastable combined atomic force and total internal fluorescence microscope
(vol 80, 063704, 2009).Review of Scientific Instruments, 80 (10): Art No. 109901.

Puchner EM, Gaub HE (2009).
Force and function: probing proteins with AFM-based force spectroscopy.
Current Opinion in Structural Biology, 19 (5):605-614.

Ho D, Zimmermann JL, Dehmelt FA, Steinbach U, Erdmann M, Severin P, Falter K, Gaub HE (2009).
Force-Driven Separation of Short Double-Stranded DNA.
Biophysical Journal 97 (12):3158-3167.

Vogelsang J, Cordes T, Tinnefeld P (2009).
Single-molecule photophysics of oxazines on DNA and its application in a FRET switch.
Photochemical& Photobiological Sciences, 8(4):486-496.

Vogelsang J, Cordes T, Tinnefeld P (2009).
On the Mechanism of Trolox as Antiblinking and Antibleaching Reagent.
Journal of the American Chemical Society, 131(14):5018.

Vogelsang J, Cordes T, Forthmann C, Steinhauer C, Tinnefeld P (2009).
Controlling the fluorescence of ordinary oxazine dyes for single-molecule switching and superresolution microscopy.
Proceedings of the National Academy of Sciences of the United States of America, 106(20):8107-8112.

Person B, Stein IH, Steinhauer C, Vogelsang J, Tinnefeld P (2009).
Correlated Movement and Bending of Nucleic Acid Structures Visualized by Multicolor Single-Molecule Spectroscop.
Chemphyschem, 10(9-10):1455-1460.

Steinhauer C, Jungmann R, Sobey TL, Simmel FC, Tinnefeld P (2009).
DNA Origami as a Nanoscopic Ruler for Super-Resolution Microscopy.
Angewandte Chemie-International Edition, 48(47):8870-8873.

Kufer SK, Puchner EM, Gumpp H, Liedl T, Gaub HE (2008).
Single-molecule cut-and-paste surface assembly.
Science, 319 (5863):594-596

Helenius J, Heisenberg CP, Gaub HE, Muller DJ (2008).
Single-cell force spectroscopy.
Journal of Cell Science, 121 (11):1785-1791

Albrecht CH, Neuert G, Lugmaier RA, Gaub HE (2008).
Molecular force balance measurements reveal that double-stranded DNA unbinds under force in rate-dependent pathways.
Biophysical Journal, 94 (12):4766-4774

Sonnenberg L, Billon L, Gaub HE (2008).
Competitive adhesion reduces the effective bridging length of polymers.
Macromolecules, 41 (10):3688-3691

Engel A, Gaub HE (2008).
Structure and mechanics of membrane proteins.
Annual Review of Biochemistry, 77127-148

Puchner EM, Franzen G, Gautel M, Gaub HE (2008).
Comparing proteins by their unfolding pattern.
Biophysical Journal,95 (1):426-434

Morfill J, Neumann J, Blank K, Steinbach U, Puchner EM, Gottschalk KE, Gaub HE (2008).
Force-based analysis of multidimensional energy landscapes: Application of dynamic force spectroscopy and steered molecular dynamics simulations to an antibody fragment-peptide complex.
Journal of Molecular Biology, 381 (5):1253-1266

Puchner EM, Alexandrovich A, Kho AL, Hensen U, Schafer LV, Brandmeier B, Grater F, Grubmuller H, Gaub HE, Gautel M (2008).
Mechanoenzymatics of titin kinase.
Proceedings of the National Academy of Sciences of the united States of America, 105 (36):13385-13390

David R, Ho D, Gaub HE (2008).
Molecular force balance for the investigation of receptor-ligand-interactions on living cells.
Journal pf Peptide Science, 14 (8):134-134

Puchner EM, Kufer SK, Strackharn M, Stahl SW, Gaub HE (2008).
Nanoparticle Self-Assembly on a DNA-Scaffold Written by Single-Molecule Cut-and-Paste.
Nano Letters, 8 (11):3692-3695

Puchner EM, Alexandrovich A, Kho AL, Hensen U, Schafer LV, Brandmeier B, Grater F, Grubmuller H, Gaub HE, Gautel M (2008).
Mechanoenzymatics of titin kinase
(vol 105, pg 13385, 2008).Proceedings of the National Academy of Sciences of the United States of America, 105 (52):21045-21045

Vogelsang J, Kasper R, Steinhauer C, Person B, Heilemann M, Sauer M, Tinnefeld P (2008).
A reducing and oxidizing system minimizes photobleaching and blinking of fluorescent dyes.
Angewandte Chemie-International Edition, 47(29):5465-5469

Heilemann M, van de Linde S, Schuttpelz M, Kasper R, Seefeldt B, Mukherjee A, Tinnefeld P, Sauer M (2008).
Subdiffraction-resolution fluorescence imaging with conventional fluorescent probes.
Angewandte Chemie-International Edition, 47 (33):6172-6176

Huang S, Xiao Q, He ZK, Liu Y, Tinnefeld P, Su XR, Peng XN (2008).
A high sensitive and specific QDs FRET bioprobe for MNase.
Chemical Communications, (45):5990-5992

Seefeldt B, Kasper R, Seidel T, Tinnefeld P, Dietz KJ, Heilemann M, Sauer M (2008).
Fluorescent proteins for single-molecule fluorescence applications.
Journal of Biophotonics, 1(1):74-82

Steinhauer C, Forthmann C, Vogelsang J, Tinnefeld P (2008).
Superresolution Microscopy on the Basis of Engineered Dark States.
Journal of the American Chemical Society, 130(50):16840

Schmitz J, Gottschalk KE (2008).
Mechanical regulation of cell adhesion.
Soft Matter, 4(7):1373-1387

Schmitz J, Benoit M, Gottschalk KE (2008).
The viscoelasticity of membrane tethers and its importance for cell adhesion.
Biophysical Journal, 95(3):1448-1459

Kuhner F, Lugmaier RA, Mihatsch S, Gaub HE (2007).
Print your atomic force microscope.
Review of Scientific Instruments, 78(7): Art N° 075105

Kuhner F, Morfill J, Neher RA, Blank K, Gaub HE (2007).
Force-induced DNA slippage.
Biophysical Journal, 92(7):2491-2497

Morfill J, Kuhner F, Blank K, Lugmaier RA, Sedlmair J, Gaub HE (2007).
B-S transition in short oligonucleotides.
Biophysical Journal, 93(7):2400-2409

Neuert G, Albrecht CH, Gaub HE (2007).
Predicting the rupture probabilities of molecular bonds in series.
Biophysical Journal, 93 (4):1215-1223

Schafer LV, Muller EM, Gaub HE, Grubmuller H (2007).
Elastic properties of photoswitchable azobenzene polymers from molecular dynamics simulations.
Angewandte Chemie-International Edition, 46 (13):2232-2237

Sonnenberg L, Parvole J, Kuhner F, Billon L, Gaub HE (2007).
Choose sides: Differential polymer adhesion.
Langmuir, 23 (12):6660-6666

Morfill J, Blank K, Zahnd C, Luginbuhl B, Kuhner F, Gottschalk KE, Pluckthun A, Gaub HE (2007).
Affinity-matured recombinant antibody fragments analyzed by single-molecule force Spectroscopy.
Biophysical Journal, 933583-3590

Dose C, Ho D, Gaub HE, Dervan PB, Albrecht CH (2007).
Recognition of "mirror-image" DNA by small molecules.
Angewandte Chemie-International Edition, 468384-8387

Cui SX, Yu J, Kuhner F, Schulten K, Gaub HE (2007).
Double-stranded DNA dissociates into single strands when dragged into a poor solvent.
Journal of the American Chemical Society, 12914710-14716

Sonnenberg L, Luo YF, Schlaad H, Seitz M, Colfen H, Gaub HE (2007).
Quantitative single molecule measurements on the interaction forces of poly(L-glutamic acid) with calcite crystals.
Journal of the American Chemical Society,129 (49):15364-15371

Vogelsang J, Doose S, Sauer M, Tinnefeld P (2007).
Single-molecule fluorescence resonance energy transfer in nanopipets: Improving distance resolution and concentration range.
Analytical Chemistry 797367-7375

Albrecht, Clausen-Schaumnn H, Gaub HE (2006).
Differential analysis of biomolecular forces.
Journal of Physics-Condensed Matter, 18(18):S581–S599.

Blank K, Morfill J, Gumpp H, Gaub HE (2006).
Functional expression of Candida antarctica lipase B in Eschericha coli.
J of Biotechnology, 125(4):474-483.

Blank K, Morfill J, Gaub HE (2006).
Site-specific immobilization of genetically engineered variants of Candida antartica lipase B.
Chembiochem, 7(9):1349–1351.

Cui SX, Albrecht C, Kuhner F, Gaub HE (2006).
Weakly bound water molecules shorten single-stranded DNA.
J of the American Chemical Society, 128(20):6636-6639.

Friedsam C, Gaub HE, Netz RR (2006).
Probing surfaces with single-polymer atomic force microscope ex periments.

Kessler M, Gaub HE(2006).
Unfolding barriers in bacteriorhodopsin probed from the cytoplasmic and the extracellular side by AFM.
Structure, 14(3):521-527.

Kessler M, Gottschalk KE, Janovjak H, Muller DJ, Gaub HE (2006).
Bacteriorhodopsin folds into the membrane against an external force.
J of Molecular Biology, 357(2):644–654.

Kuhner F, Erdmann M, Sonnenberg L, Serr A, Morfill J, Gaub HE (2006).
Friction of single polymers at surfaces.
Langmuir, 22(26):11180–11186.

Kuhner F, Gaub HE (2006).
Modelling cantilever-based force spectroscopy with polymers.
Polymer, 47(7):2555–2563.

Kuhner F, Erdmann M, Gaub HE (2006).
Scaling exponent and Kuhn length of pinned polymers by single molecule force spectroscopy.
Physical Review Letters, 97 Art No. 218301.

Neuert G, Albrecht C, Pamir E, Gaub HE (2006).
Dynamic force spectroscopy of the digoxigenin-antibody complex.
Febs Letters, 580(2):505–509.

Neuert G, Hugel T, Netz RR, Gaub HE (2006).
Elasticity of poly(azobenzene-peptides).
Macromolecules, 39(2):789-797.

Sonnenberg L, Parvole J, Borisov O, Billon L, Gaub HE, Seitz M (2006).
AFM-based single molecule force spectroscopy of end-grafted poly(acrylic acid) monolayers.
Macromolecules, 39(1):281-288.

Friedsam C, Gaub H, and Netz R (2005).
Adsorption energies of single charged polymers.
Europhysics Letters, 72(5):844–850.

Füzesi M, Gottschalk KE, Lindzen M, Shainskaya A, Küster B, Garty H, and Karlish SJ (2005).
Covalent cross-links between the gamma subunit (FXYD2) and alpha and beta subunits of Na,K-ATPase: modeling the alpha-gamma interaction.
J Biol Chem, 280(18):18291–18301.

Gottschalk KE (2005).
A coiled-coil structure of the alphaIIbbeta3 integrin transmembrane and cytoplasmic domains in its resting state.
Structure, 13(5):703–712.

Heilemann M, Margeat E, Kasper R, Sauer M, and Tinnefeld P (2005).
Carbocyanine dyes as efficient reversible single-molecule optical switch.
J Am Chem Soc, 127(11):3801-3806.

Heinlein T, Biebricher A, Schluter P, Roth CM, Herten DP, Wolfrum J, Heilemann M, Muller C, Tinnefeld P, and Sauer M (2005).
High-resolution colocalization of single molecules within the resolution gap of far-field microscopy.
ChemPhysChem, 6(5):949-955.

Hugel T, Rief M, Seitz M, Gaub H, and Netz R (2005).
Highly stretched single polymers: Atomic-force-microscope experiments versus ab-initio theory.
Physical Review Letters, 94(4):048301.

Kirchner C, Liedl T, Kudera S, Pellegrino T, Javier A, Gaub H, Stolzle S, Fertig N, and Parak W (2005).
Cytotoxicity of colloidal CdSe and CdSe/ZnS nanoparticles.
Nano Letters, 5(2):331–338.

Kufer S, Dietz H, Albrecht C, Blank K, Kardinal A, Rief M, and Gaub H (2005).
Covalent immobilization of recombinant fusion proteins with hAGT for single molecule force spectroscopy.
European Biophysics Journal With Biophysics Letters, 35(1):72–78.

Lugmaier R, Hugel T, Benoit M, and Gaub H (2005).
Phase contrast and DIC illumination for AFM hybrids.
Ultramicroscopy, 104(3-4):255–260.

Neuert G, Kufer S, Benoit M, and Gaub H (2005).
Modular multichannel surface plasmon spectrometer.
Review Of Scientific Instruments, 76(5):054303.

Strugatsky D, Gottschalk KE, Goldshleger R, and Karlish SJ (2005).
D443 of the N domain of Na+,K+-ATPase interacts with the ATP-Mg2+ complex, possibly via a second Mg2+ ion.
Biochemistry, 44(49):15961–15969.

Tinnefeld P, and Sauer M (2005).
Branching out of single-molecule fluorescence spectroscopy: challenges for chemistry and influence on biology.
Angew Chem Int Ed, 44(18):2642-2671.

Tinnefeld P, Heilemann M, and Sauer M (2005).
Design of molecular photonic wires based on multistep electronic excitation transfer.
ChemPhysChem, 6(2):217-222.

Bell TD, Habuchi S, Masuo S, Österling I, Müllen K, Tinnefeld P, Sauer M, van der Auweraer M, Hofkens J, and De Schryver F (2004).
Single photon emission from a dendrimer containing eight perylene diimide chromophores.
Aust J Chem, 57(12):1169-1173.

Biebricher A, Paul A, Tinnefeld P, Gölzhäuser A, and Sauer M (2004).
Controlled three-dimensional immobilization of biomolecules on chemically patterned surfaces.
J Biotechnol, 112(1-2):97-107.

Blank K, Lankenau A, Mai T, Schiffmann S, Gilbert I, Hirler S, Albrecht C, Benoit M, Gaub H, and Clausen-Schaumann H (2004).
Double-chip protein arrays: force-based multiplex sandwich immunoassays with increased specificity.
Analytical And Bioanalytical Chemistry, 379(7-8):974–981.

Friedsam C, Becares A, Jonas U, Seitz M, and Gaub H (2004).
Adsorption of polyacrylic acid on self-assembled monolayers investigated by single-molecule force spectroscopy.
New Journal Of Physics, 6:9.

Friedsam C, Seitz M, and Gaub H (2004).
Investigation of polyelectrolyte desorption by single molecule force spectroscopy.
Journal Of Physics-Condensed Matter, 16(26):S2369–S2382.

Gilbert L, Schiffmann S, Rubenwolf S, Jensen K, Mail T, Albrecht C, Lankenau A, Beste G, Blank K, Gaub H, and Clausen-Schaumann H (2004).
Double chip protein arrays using recombinant single-chain Fv antibody fragments.
Proteomics, 4(5):1417–1420.

Gottschalk KE (2004).
Structure prediction of small transmembrane helix bundles.
J Mol Graph Model, 23(1):99–110.

Gottschalk KE, and Kessler H (2004).
A computational model of transmembrane integrin clustering.

Structure, 12(6):1109–1116.

Gottschalk KE, and Kessler H (2004).
Evidence for hetero-association of transmembrane helices of integrins.
FEBS Lett, 557(1-3):253–258.

Gottschalk KE, Neuvirth H, and Schreiber G (2004).
A novel method for scoring of docked protein complexes using predicted protein-protein binding sites.
Protein Eng Des Sel, 17(2):183–189.

Gottschalk KE, Soskine M, Schuldiner S, and Kessler H (2004).
A structural model of EmrE, a multi-drug transporter from Escherichia coli.
Biophys J, 86(6):3335–3348.

Heilemann M, Tinnefeld P, Sanchez Mosteiro G, Garcia Parajo M, Van Hulst N, and Sauer M (2004).
Multistep energy transfer in single molecular photonic wires.
J Am Chem Soc, 126(21):6514-6515.

Herten DP, Biebricher A, Heilemann M, Heinlein T, Müller C, Schlüter P, Tinnefeld P, Weston K, Sauer M, and Wolfrum J (2004).
Optical single molecule techniques for analytical and biological applications.
Rec Res Devel Phys Chem, 7:345-368 (invited article).

Kuhner F, Costa L, Bisch P, Thalhammer S, Heckl W, and Gaub H (2004).
LexA-DNA bond strength by single molecule force spectroscopy.
Biophysical Journal, 87(4):2683–2690.

Marinelli L, Gottschalk K, Meyer A, Novellino E, and Kessler H (2004).
Human integrin alphavbeta5: homology modeling and ligand binding.
J Med Chem, 47(17):4166–4177.

Stein B, George M, Gaub H, and Parak W (2004).
Extracellular measurements of averaged ionic currents with the light-addressable potentiometric sensor (LAPS).
Sensors And Actuators B-Chemical, 98(2-3):299–304.

Tinnefeld P, Buschmann V, Weston K, Biebricher A, Herten DP, Piestert O, Heinlein T, Heilemann M, and Sauer M (2004).
How single-molecule photophysical studies complement ensemble methods for a better understanding of chromophores and interchromophore interactions.
Rec Res Devel Phys Chem, 7:95-125 (invited article).

Tinnefeld P, Hofkens J, Herten DP, Masuo S, Vosch T, Cotlet M, Habuchi S, Mullen K, De Schryver F, and Sauer M (2004).
Higher-excited-state photophysical pathways in multichromophoric systems revealed by single-molecule fluorescence spectroscopy.
ChemPhysChem, 5(11):1786-1790.

Vardy E, Arkin I, Gottschalk K, Kaback HR, and Schuldiner S (2004).
Structural conservation in the major facilitator superfamily as revealed by comparative modeling.
Protein Sci, 13(7):1832–1840.

Albrecht C, Blank K, Lalic-Multhaler M, Hirler S, Mai T, Gilbert I, Schiffmann S, Bayer T, Clausen-Schaumann H, and Gaub H (2003).
DNA: A programmable force sensor.
Science, 301(5631):367–370.

Blank K, Mai T, Gilbert I, Schiffmann S, Rankl J, Zivin R, Tackney C, Nicolaus T, Spinnler K, Oesterhelt F, Benoit M, Clausen-Schaumann H, and Gaub H (2003).
A force-based protein biochip.
Proceedings Of The National Academy Of Sciences Of The United States Of America, 100(20):11356–11360.

Friedsam C, Wehle A, Kuhner F, and Gaub H (2003).
Dynamic single-molecule force spectroscopy: bond rupture analysis with variable spacer length.
Journal Of Physics-Condensed Matter, 15(18):S1709–S1723.

Hofkens J, Cotlet M, Vosch T, Tinnefeld P, Weston K, Ego C, Grimsdale A, Mullen K, Beljonne D, Bredas JL, Jordens S, Schweitzer G, Sauer M, and De Schryver F (2003).
Revealing competitive Forster-type resonance energy-transfer pathways in single bichromophoric molecules.
Proc Natl Acad Sci USA, 100(23):13146-13151.

Holland N, Hugel T, Neuert G, Cattani-Scholz A, Renner C, Oesterhelt D, Moroder L, Seitz M, and Gaub H (2003).
Single molecule force spectroscopy of azobenzene polymers: Switching elasticity of single photochromic macromolecules.
Macromolecules, 36(6):2015–2023.

Krautbauer R, Rief M, and Gaub H (2003).
Unzipping DNA oligomers.
Nano Letters, 3(4):493–496.

Kudera M, Eschbaumer C, Gaub H, and Schubert U (2003).
Analysis of metallo-supramolecular systems using single-molecule force spectroscopy.
Advanced Functional Materials, 13(8):615–620.

Marinelli L, Lavecchia A, Gottschalk K, Novellino E, and Kessler H (2003).
Docking studies on alphavbeta3 integrin ligands: pharmacophore refinement and implications for drug design.
J Med Chem, 46(21):4393–4404.

Seitz M, Friedsam C, Jostl W, Hugel T, and Gaub H (2003).
Probing solid surfaces with single polymers.
Chemphyschem, 4(9):986–990.

Stein B, George M, Gaub H, Behrends J, and Parak W (2003).
Spatially resolved monitoring of cellular metabolic activity with a semiconductor-based biosensor.
Biosensors & Bioelectronics, 18(1):31–41.

Strugatsky D, Gottschalk KE, Goldshleger R, Bibi E, and Karlish SJ (2003).
Expression of Na+,K+-ATPase in Pichia pastoris: analysis of wild type and D369N mutant proteins by Fe2+-catalyzed oxidative cleavage and molecular modeling.
J Biol Chem, 278(46):46064–46073.

Tinnefeld P, Buschmann V, Weston K, and Sauer M (2003).
Direct Observation of collective blinking and energy transfer in a bichromophoric system.
J Phys Chem A, 107(3):323-327.

Vosch T, Cotlet M, Hofkens J, van der Biest K, Lor M, Weston K, Tinnefeld P, Sauer M, Latterini L, Müllen K, and De Schryver F (2003).
Probing Förster Type Energy Pathways in a first generation rigid dendrimer bearing two perylene imide chromophores.
J Phys Chem A, 107(36):6920-6931.

Benoit M, and Gaub H (2002).
Measuring cell adhesion forces with the atomic force microscope at the molecular level.
Cells Tissues Organs, 172(3):174–189.

Gottschalk K, and Kessler H (2002).
The structures of integrins and integrin-ligand complexes: implications for drug design and signal transduction.
Angew Chem Int Ed Engl, 41(20):3767–3774.

Gottschalk K, Adams P, Brunger A, and Kessler H (2002).
Transmembrane signal transduction of the alpha(IIb)beta(3) integrin.
Protein Sci, 11(7):1800–1812.

Gottschalk K, Günther R, and Kessler H (2002).
A three-state mechanism of integrin activation and signal transduction for integrin alpha(v)beta(3).
Chembiochem, 3(5):470–473.

Heilemann M, Herten D, Heintzmann R, Cremer C, Muller C, Tinnefeld P, Weston K, Wolfrum J, and Sauer M (2002).
High-resolution colocalization of single dye molecules by fluorescence lifetime imaging microscopy.
Anal Chem, 74(14):3511-3517.

Hugel T, Holland N, Cattani A, Moroder L, Seitz M, and Gaub H (2002).
Single-molecule optomechanical cycle.
Science, 296(5570):1103–1106.

Kirchner C, George M, Stein B, Parak W, Gaub H, and Seitz M (2002).
Corrosion protection and long-term chemical functionalization of gallium arsenide in an aqueous environment.
Advanced Functional Materials, 12(4):266–276.

Krautbauer R, Fischerlander S, Allen S, and Gaub H (2002).
Mechanical fingerprints of DNA drug complexes.
Single Molecules, 3(2-3):97–103.

Krautbauer R, Pope L, Schrader T, Allen S, and Gaub H (2002).
Discriminating small molecule DNA binding modes by single molecule force spectroscopy.
Febs Letters, 510(3):154–158.

Krautbauer R, Schrader T, Pope L, Allen S, and Gaub H (2002).
Discriminating small molecule DNA binding modes by single molecule force spectroscopy.
Biophysical Journal, 82(1):141A–142A.

Tinnefeld P, Weston K, Vosch T, Cotlet M, Weil T, Hofkens J, Mullen K, De Schryver F, and Sauer M (2002).
Antibunching in the emission of a single tetrachromophoric dendritic system.
J Am Chem Soc, 124(48):14310-14311.

Urry D, Hugel T, Seitz M, Gaub H, Sheiba L, Dea J, Xu J, and Parker T (2002).
Elastin: a representative ideal protein elastomer.
Philosophical Transactions Of The Royal Society Of London Series B-Biological Sciences, 357(1418):169–184.

Weston K, Dyck M, Tinnefeld P, Muller C, Herten D, and Sauer M (2002).
Measuring the number of independent emitters in single-molecule fluorescence images and trajectories using coincident photons.
Anal Chem, 74(20):5342-5349.

Gaub H (2001).
Unfolding bacteriorhodopsin and unbinding CSA by AFM-related techniques.
Abstracts Of Papers Of The American Chemical Society, 221:U324–U324.

Krautbauer R, Allen S, Tessmer I, Skinner G, Pope L, Schrader T, Molloy J, Tendler SJ, and Gaub H (2001).
Single molecule force spectroscopy investigations of DNA-drug interactions.
Abstracts Of Papers Of The American Chemical Society, 221:U345–U345.

Parak W, George M, Kudera R, Gaub H, and Behrends J (2001).
Effects of semiconductor substrate and glia-free culture on the development of voltage-dependent currents in rat striatal neurones.
European Biophysics Journal With Biophysics Letters, 29(8):607–620.

Tinnefeld P, Herten DP, and Sauer M (2001).
Photophysical dynamics of single molecules studied by spectrally-resolved fluorescence lifetime-imaging microscopy (FLIM).
J Phys Chem A, 105(34):7989-8003.

Tinnefeld P, Müller C, and Sauer M (2001).
Time-varying photon probability distribution of individual molecules at room temperature.
Chem Phys Lett, 345(3-4):252-258.

Benoit M, Gabriel D, Gerisch G, and Gaub H (2000).
Discrete interactions in cell adhesion measured by single-molecule force spectroscopy.
Nature Cell Biology, 2(6):313–317.

Bohm S, Parak W, George M, Gaub H, and Lorke A (2000).
Characterization of the field-effect addressable potentiometric sensor (FAPS).
Sensors And Actuators B-Chemical, 68(1-3):266–273.

Clausen-Schaumann H, Rief M, Tolksdorf C, and Gaub H (2000).
Mechanical stability of single DNA molecules.
Biophysical Journal, 78(4):1997–2007.

Clausen-Schaumann H, Seitz M, Krautbauer R, and Gaub H (2000).
Force spectroscopy with single bio-molecules.
Current Opinion In Chemical Biology, 4(5):524–530.

Dettmann W, Grandbois M, Andre S, Benoit M, Wehle A, Kaltner H, Gabius H, and Gaub H (2000).
Differences in zero-force and force-driven kinetics of ligand dissociation from beta-galactoside-specific proteins (plant and animal lectins, immunoglobulin G) monitored by plasmon resonance and dynamic single molecule force microscopy.
Archives Of Biochemistry And Biophysics, 383(2):157–170.

Gaub H (2000).
Single molecule force spectroscopy with AFM-related techniques (Langmuir lecture).
Abstracts Of Papers Of The American Chemical Society, 220:U260–U260.

George M, Parak W, and Gaub H (2000).
Highly integrated surface potential sensors.
Sensors And Actuators B-Chemical, 69(3):266–275.

George M, Parak W, Gerhardt I, Moritz W, Kaesen F, Geiger H, Eisele I, and Gaub H (2000).
Investigation of the spatial resolution of the light-addressable potentiometric sensor.
Sensors And Actuators A-Physical, 86(3):187–196.

Grandbois M, Dettmann W, Benoit M, and Gaub H (2000).
Affinity imaging of red blood cells using an atomic force microscope.
Journal Of Histochemistry & Cytochemistry, 48(5):719–724.

Herten DP, Tinnefeld P, and Sauer M (2000).
Identification of single fluorescently labelled mononucleotide molecules in solution by spectrally resolved time-correlated single-photon counting.
Appl Phys B, 71:765-771.

Irngartinger H, Fettel PW, Escher T, Tinnefeld P, Nord S, and Sauer M (2000).
Substituent effects on redox properties and photoinduced electron transfer in isoxazolo-fullerenes.
Eur J Org Chem, 3:455-465.

Krautbauer R, Clausen-Schaumann H, and Gaub H (2000).
Cisplatin changes the mechanics of single DNA molecules.
Angewandte Chemie-International Edition, 39(21):3912–+.

Oesterhelt F, Oesterhelt D, Pfeiffer M, Engel A, Gaub H, and Muller D (2000).
Unfolding pathways of individual bacteriorhodopsins.
Science, 288(5463):143–146.

Parak W, Dannohl S, George M, Schuler M, Schaumburger J, Gaub H, Muller O, and Aicher W (2000).
Metabolic activation stimulates acid production in synovial fibroblasts.
Journal Of Rheumatology, 27(10):2312–2322.

Parak W, George M, Domke J, Radmacher M, Behrends J, Denyer M, and Gaub H (2000).
Can the light-addressable potentiometric sensor (LAPS) detect extracellular potentials of cardiac myocytes?
Ieee Transactions On Biomedical Engineering, 47(8):1106–1113.

Rief M, Gautel M, and Gaub H (2000).
Unfolding forces of titin and fibronectin domains directly measured by AFM.
Elastic Filaments Of The Cell, 481:129–141.

Schmitt L, Ludwig M, Gaub H, and Tampe R (2000).
A metal-chelating microscopy tip as a new toolbox for single-molecule experiments by atomic force microscopy.
Biophysical Journal, 78(6):3275–3285.

Tinnefeld P, Buschmann V, Herten DP, Han KT, and Sauer M (2000).
Confocal fluorescence lifetime imaging microscopy (FLIM) at the single molecule level.
Single Mol, 1(3):215-223.

Zhang W, Xu Q, Zou S, Li H, Xu W, Zhang X, Shao Z, Kudera M, and Gaub H (2000).
Single-molecule force spectroscopy on Bombyx mori silk fibroin by atomic force microscopy.
Langmuir, 16(9):4305–4308.