Redox regulation of protein tyrosine phosphatase 1B (PTP1B): Importance of steric and electronic effects on the unusual cyclization of the sulfenic acid intermediate to a sulfenyl amide
作者:Bani Kanta Sarma
DOI:10.1016/j.molstruc.2013.05.044
日期:2013.9
phenylsulfenic acids that can induce steric environment and alter the electronic properties around the sulfenicacid moiety by S⋯N or S⋯O nonbonded interactions destabilize the sulfenicacids by inducing strain in the molecule. This may lead to efficient the cyclization of such sulfenicacids. This model study suggests that the amino acid residues in the close proximity of the sulfenicacid moiety in PTP1B
N-Hydroxyalkyl derivatives of 1,2-benzisothiazol-3(2H)-one and 1,2-benzisothiazol-3(2H)-thione have been prepared and their antifungal and antibacterial activity evaluated. Several compounds were active against selected fungi and Gram-positive microorganisms. Interesting activity was observed against the anaerobic strain Clostridium perfringens. Generally the more active compounds belong to the class of 1,2-benzisothiazol-3(2H)-ones. The retardation matches R(M) of the compounds was also evaluated but the results obtained show that lipophilicity has only a minor effect on the antimicrobial activity.
Redox Regulation of Protein Tyrosine Phosphatase 1B (PTP1B): A Biomimetic Study on the Unexpected Formation of a Sulfenyl Amide Intermediate
作者:Bani Kanta Sarma、Govindasamy Mugesh
DOI:10.1021/ja070410o
日期:2007.7.1
nonbonded S...O/N interactions on the cyclization reactions of amide substituted benzene sulfenic acids are described. The reaction profiles and the role of different substituents on the cyclization are investigated in detail by theoretical calculations. It is shown that the synthetic thiols having ortho-amide substituents may serve as good models for the enforced proximity of the amide and cysteine