Mechanical Force Can Fine-Tune Redox Potentials of Disulfide Bonds
نویسندگان
چکیده
منابع مشابه
Tunable nanomechanics of protein disulfide bonds in redox microenvironments.
Disulfide bonds are important chemical cross-links that control the elasticity of fibrous protein materials such as hair, feather, wool and gluten in breadmaking dough. Here we present a novel computational approach using the first-principles-based ReaxFF reactive force field and demonstrate that this approach can be used to show that the fracture strength of disulfide bonds is decreased under ...
متن کاملInfluence of external force on properties and reactivity of disulfide bonds.
The mechanochemistry of the disulfide bridge--that is, the influence of an externally applied force on the reactivity of the sulfur-sulfur bond--is investigated by unrestricted Kohn-Sham theory. Specifically, we apply the COGEF (constrained geometry simulates external force) approach to characterize the mechanochemistry of the disulfide bond in three different chemical environments: dimethyl di...
متن کاملTheoretical determination of the redox potentials of NRH:quinone oxidoreductase 2 using quantum mechanical/molecular mechanical simulations.
NRH:quinone oxidoreductase 2 (NQO2) is a flavoenzyme that catalyzes a one-step two-electron reduction of quinones. During this enzyme catalysis, the 7,8-dimethyl isoalloxazine (flavin) ring of the enzyme-bound cofactor, flavin adenine dinucleotide (FAD), shuttles between reduced and oxidized states as the enzyme passes through multiple cycles of binding/release of alternate substrates. These re...
متن کاملThe influence of disulfide bonds on the mechanical stability of proteins is context dependent.
Disulfide bonds play a crucial role in proteins, modulating their stability and constraining their conformational dynamics. A particularly important case is that of proteins that need to withstand forces arising from their normal biological function and that are often disulfide bonded. However, the influence of disulfides on the overall mechanical stability of proteins is poorly understood. Her...
متن کاملRedox potentials of glutaredoxins and other thiol-disulfide oxidoreductases of the thioredoxin superfamily determined by direct protein-protein redox equilibria.
Glutaredoxins belong to the thioredoxin superfamily of structurally similar thiol-disulfide oxidoreductases catalyzing thiol-disulfide exchange reactions via reversible oxidation of two active-site cysteine residues separated by two amino acids (CX1X2C). Standard state redox potential (E degrees ') values for glutaredoxins are presently unknown, and use of glutathione/glutathione disulfide (GSH...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biophysical Journal
سال: 2012
ISSN: 0006-3495
DOI: 10.1016/j.bpj.2011.12.039