Single-molecule force spectroscopy measurements of bond elongation during a bimolecular reaction

Journal of the American Chemical Society
Sri Rama Koti AinavarapuJulio M Fernandez

Abstract

It is experimentally challenging to directly obtain structural information of the transition state (TS), the high-energy bottleneck en route from reactants to products, for solution-phase reactions. Here, we use single-molecule experiments as well as high-level quantum chemical calculations to probe the TS of disulfide bond reduction, a bimolecular nucleophilic substitution (S N2) reaction. We use an atomic force microscope in force-clamp mode to apply mechanical forces to a protein disulfide bond and obtain force-dependent rate constants of the disulfide bond reduction initiated by a variety of nucleophiles. We measure distances to the TS or bond elongation (Delta x), along a 1-D reaction coordinate imposed by mechanical force, of 0.31 +/- 0.05 and 0.44 +/- 0.03 A for thiol-initiated and phosphine-initiated disulfide bond reductions, respectively. These results are in agreement with quantum chemical calculations, which show that the disulfide bond at the TS is longer in phosphine-initiated reduction than in thiol-initiated reduction. We also investigate the effect of solvent environment on the TS geometry by incorporating glycerol into the aqueous solution. In this case, the Delta x value for the phosphine-initiated reduction ...Continue Reading

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