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- W2007406511 abstract "Under a stretching force, the sugar ring of polysaccharide molecules switches from the chair to the boat-like or inverted chair conformation. This conformational change can be observed by stretching single polysaccharide molecules with an atomic force microscope. In those early experiments, the molecules were stretched at a constant rate while the resulting force changed over wide ranges. However, because the rings undergo force-dependent transitions, an experimental arrangement where the force is the free variable introduces an undesirable level of complexity in the results. Here we demonstrate the use of force-ramp atomic force microscopy to capture the conformational changes in single polysaccharide molecules. Force-ramp atomic force microscopy readily captures the ring transitions under conditions where the entropic elasticity of the molecule is separated from its conformational transitions, enabling a quantitative analysis of the data with a simple two-state model. This analysis directly provides the physico-chemical characteristics of the ring transitions such as the width of the energy barrier, the relative energy of the conformers, and their enthalpic elasticity. Our experiments enhance the ability of single-molecule force spectroscopy to make high-resolution measurements of the conformations of single polysaccharide molecules under a stretching force, making an important addition to polysaccharide spectroscopy." @default.
- W2007406511 created "2016-06-24" @default.
- W2007406511 creator A5008627573 @default.
- W2007406511 creator A5030144808 @default.
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- W2007406511 date "2002-03-26" @default.
- W2007406511 modified "2023-10-16" @default.
- W2007406511 title "Chair-boat transitions in single polysaccharide molecules observed with force-ramp AFM" @default.
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- W2007406511 doi "https://doi.org/10.1073/pnas.072435699" @default.
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