2026-04-13T03:11:36Zhttps://recercat.cat/oai/request
oai:recercat.cat:2445/1545072025-12-04T20:52:56Zcom_2072_1057col_2072_478796col_2072_478917
RECERCAT author Dopieralski, Przemyslaw author Ribas Ariño, Jordi author Anjukandi, Padmesh author Krupicka, Martin author Marx, Dominik 2020-03-31T09:52:18Z2020-03-31T09:52:18Z2015-12-042020-03-31T09:52:19Z Understanding the impact of tensile forces on disulfide bond cleavage is not only crucial to the breaking of cross-linkers in vulcanized materials such as strained rubber, but also to the regulation of protein activity by disulfide switches. By using ab initio simulations in the condensed phase, we investigated the response of disulfide cleavage by β-elimination to mechanical stress. We reveal that the rate- determining first step of the thermal reaction, which is the abstraction of the β- proton, is insensitive to external forces. However, forces larger than about 1 nN were found to reshape the free-energy landscape of the reaction so dramatically that a second channel is created, where the order of the reaction steps is reversed, turning β-deprotonation into a barrier-free follow-up process to C−S cleavage. This transforms a slow and force-independent process with second-order kinetics into a unimolecular reaction that is greatly accelerated by mechanical forces. (c) Wiley-VCH, 2015 info:eu-repo/semantics/openAccess Polímers Dinàmica molecular Mecanismes de reacció (Química) Polymers Molecular dynamics Reaction mechanisms (Chemistry) Force-induced reversal of beta-eliminations: stressed disulfide bonds in alkaline solution info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion