构象异构
胱氨酸
半胱氨酸
化学
吉布斯自由能
异构化
结晶学
超球体
计算化学
热力学
分子
有机化学
物理
几何学
催化作用
酶
数学
作者
Naoki Kishimoto,Hiroki Waizumi
标识
DOI:10.1016/j.cplett.2017.07.029
摘要
Stable conformers of l-cysteine and l,l-cystine were explored using an automated and efficient conformational searching method. The Gibbs energies of the stable conformers of l-cysteine and l,l-cystine were calculated with G4 and MP2 methods, respectively, at 450, 298.15, and 150 K. By assuming thermodynamic equilibrium and the barrier energies for the conformational isomerization pathways, the estimated ratios of the stable conformers of l-cysteine were compared with those determined by microwave spectroscopy in a previous study. Equilibrium structures of 1:1 and 2:1 cystine–Fe complexes were also calculated, and the energy of insertion of Fe into the disulfide bond was obtained.
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