Effect of stretching on the molecular conformation of oligo (ethylene oxide): a theoretical study
TLDR
In this paper, the force-extension measurements on simple poly(ethylene glycol) molecules in different solvents can be quantitatively explained based on ab initio quantum mechanical calculations of the potential energy surfaces of the polymer segments in vacuum and in the solvated form.Abstract:
The force-extension measurements on simple poly(ethylene glycol) molecules by Oesterfelt et al in different solvents can be quantitatively explained based on ab initio quantum mechanical calculations of the potential energy surfaces of the polymer segments in vacuum and in the solvated form. The proper statistical mechanical calculations of the force-extension relation, both for isothermal-isochoric and isothermal-isobaric conditions (the latter appropriate to the experimental set-up), demonstrate, that in the low-force regime transitions from the amorphous to the helical conformers, and in the high-force regime stretching of the helical to the planar `all-trans' conformer occur. The presence of water affects all but the `all-trans' conformer by shortening and stiffening.read more
Citations
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Force Spectroscopy of Molecular Systems-Single Molecule Spectroscopy of Polymers and Biomolecules.
TL;DR: The intention of this review article is to present a critical evaluation of the actual development of static force spectroscopy, and mainly focuses on experiments dealing with inter- and intramolecular forces-starting with "simple" electrostatic forces, then ligand-receptor systems, and finally the stretching of individual molecules.
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Covalent mechanochemistry: theoretical concepts and computational tools with applications to molecular nanomechanics.
Jordi Ribas-Arino,Dominik Marx +1 more
TL;DR: From Macroscopic Milling to Bond-Selective Manipulation from macroscopic milling to bond-selected Manipulation is described.
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Elasticity of Single Polyelectrolyte Chains and Their Desorption from Solid Supports Studied by AFM Based Single Molecule Force Spectroscopy
Thorsten Hugel,T. Matthias Grosholz,Hauke Clausen-Schaumann,Andreas Pfau,Hermann E. Gaub,Markus Seitz +5 more
TL;DR: In this article, the elasticity of polyvinylamine chains and their desorption from solid surfaces were studied as a function of the polymer's charge density and electrolyte concentration.
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Pathogen Inhibition by Multivalent Ligand Architectures
TL;DR: The main issues and concerns associated with blocking pathogen at interfaces are highlighted, which are dependent on the nature and properties of both multivalent inhibitors and pathogens, such as viruses and bacteria.
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Stretching response of discrete semiflexible polymers
TL;DR: It is demonstrated that semiflexible polymer chains (characterized by a persistence length 𝓁 ) made up of discrete segments or bonds of length b show at large stretching forces a crossover from the standard wormlike chain behavior to a discrete-chain behavior.
References
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Reversible Unfolding of Individual Titin Immunoglobulin Domains by AFM
TL;DR: Single-molecule atomic force microscopy was used to investigate the mechanical properties of titin, the giant sarcomeric protein of striated muscle, and refolding of immunoglobulin domains was observed.
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Single Molecule Force Spectroscopy on Polysaccharides by Atomic Force Microscopy
TL;DR: Dextran filaments linked to a gold surface were probed with the atomic force microscope tip by vertical stretching and the conformational change was found to be reversible and was corroborated by molecular dynamics calculations.
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Intermolecular forces and energies between ligands and receptors
TL;DR: The recognition mechanisms and dissociation pathways of the avidin-biotin complex and of actin monomers in actin filaments were investigated and a model for the correlation among binding forces, intermolecular potential, and molecular function is proposed.
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Sensing Discrete Streptavidin-Biotin Interactions with Atomic Force Microscopy
TL;DR: The atomic force microscope (AFM) is used to study the interaction of a model receptor streptavidin with its ligand biotin under physiological conditions to provide a means to directly study molecular recognition interactions at the molecular level.
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Single molecule force spectroscopy by AFM indicates helical structure of poly(ethylene-glycol) in water
TL;DR: In this article, the resistive force as a function of elongation in different solvents was observed and the molecular response was found to be fully reversible and thus in thermodynamic equilibrium.