Intriguing cellular processing of a fluorinated amino acid during protein biosynthesis in Escherichia coli
作者:Mark D. Vaughan、Zhengding Su、Elisabeth Daub、J. F. Honek
DOI:10.1039/c6ob01690a
日期:——
Unusualin vivoprocessing of a fluorinated amino acid provides unexpected dual protein labeling inE. coli.
在大肠杆菌中,氟化氨基酸的异常in vivo处理提供了意想不到的双蛋白质标记。
Substitution reactions of [Pt(dien)Cl]+, [Pt(dien)(GSMe)]2+, cis-[PtCl2(NH3)2] and cis-[Pt(NH3)2(GSMe)2]2+ (GSMe =S-methylglutathione) with some sulfur-bonding chemoprotective agents
作者:Kelemu Lemma、Sofi K. C. Elmroth、Lars I. Elding
DOI:10.1039/b110138m
日期:——
using stopped-flow and conventional UV/VIS spectrophotometry. The reactions of 1 with 2-mercaptoethanesulfonate (mesna) and 2-mercaptoethylamine (cysteamine), which is the parent compound of 2-(3-aminopropylamino)ethylphosphorothioic acid (WR2721), and of cis-[Pt(NH3)2(GSMe)2]2+ with thiosulfate have also been studied. The reactionsbetween cisplatin and DDTC, thiourea and thiosulfate were investigated
Mechanism of Inhibition of Aliphatic Epoxide Carboxylation by the Coenzyme M Analog 2-Bromoethanesulfonate
作者:Jeffrey M. Boyd、Daniel D. Clark、Melissa A. Kofoed、Scott A. Ensign
DOI:10.1074/jbc.m110.144410
日期:2010.8
The flavin thiol Cys(87) was not alkylated by BES under reducing conditions, and no amino acid residues were modified by BES in the oxidized enzyme. The UV-visible spectrum of BES-modifed 2-KPCC showed the characteristic charge transfer absorbance expected with alkylation at Cys(82). These results identify BES as a reactive CoM analog that specifically alkylates the interchange thiol that facilitates
A role for coenzyme M (2-mercaptoethanesulfonic acid) in a bacterial pathway of aliphatic epoxide carboxylation
作者:Jeffrey R. Allen、Daniel D. Clark、Jonathan G. Krum、Scott A. Ensign
DOI:10.1073/pnas.96.15.8432
日期:1999.7.20
methyl group carrier and activator, has been identified as the thiol and central cofactor of aliphatic epoxide carboxylation in the Gram-negative bacterium Xanthobacter strain Py2. Component I catalyzed the addition of coenzyme M to epoxypropane to form a beta-hydroxythioether, 2-(2-hydroxypropylthio)ethanesulfonate. Components III and IV catalyzed the NAD(+)-dependent stereoselective dehydrogenation
短链脂肪族烯烃的细菌代谢通过氧化成环氧烷烃然后羧化成β-酮酸而发生。环氧烷烃羧化需要四种酶(组分 I-IV)、NADPH、NAD(+) 和以前未识别的亲核硫醇。在目前的工作中,辅酶 M(2-巯基乙磺酸)是一种以前仅在产甲烷古细菌中发现的化合物,它作为甲基载体和活化剂,已被确定为革兰氏脂肪族环氧化物羧化的硫醇和中心辅助因子- 阴性细菌 Xanthobacter 菌株 Py2。组分I催化辅酶M与环氧丙烷加成形成β-羟基硫醚,2-(2-羟基丙硫基)乙磺酸盐。组分 III 和 IV 催化 2-(2-hydroxypropylthio)ethanesulfonate 的 R-和 S-对映体依赖于 NAD(+) 的立体选择性脱氢,形成 2-(2-ketopropylthio)ethanesulfonate。组分 II 催化 β-酮硫醚的 NADPH 依赖性裂解和羧化,形成乙酰乙酸和辅酶 M。这些发现表明辅酶
Kinetic and Microcalorimetric Analysis of Substrate and Cofactor Interactions in Epoxyalkane:CoM Transferase, a Zinc-Dependent Epoxidase
作者:Jonathan G. Krum、Heather Ellsworth、Ryan R. Sargeant、Gregory Rich、Scott A. Ensign
DOI:10.1021/bi0255221
日期:2002.4.1
metabolism, catalyzing the nucleophilicattack of coenzyme M (CoM, 2-mercaptoethanesulfonic acid) on epoxypropane to form the thioether conjugate 2-hydroxypropyl-CoM. The biochemical and molecular properties of EaCoMT suggest that the enzyme belongs to the family of alkyltransferase enzymes for which Zn plays a key role in activating an organic thiol substrate for nucleophilicattack on an alkyl-donating