Cobalamin reduction by dithionite. Evidence for the formation of a six-coordinate cobalamin(II) complex

被引：46

作者：

Salnikov, Denis S. ^{[1
,2
]}

Silaghi-Dumitrescu, Radu ^{[3
]}

Makarov, Sergei V. ^{[1
]}

van Eldik, Rudi ^{[2
]}

Boss, Gerry R. ^{[4
]}

机构：

[1] State Univ Chem & Technol, Ivanovo 153000, Russia

[2] Univ Erlangen Nurnberg, Dept Chem & Pharm, D-91058 Erlangen, Germany

[3] Univ Babes Bolyai, RO-400028 Cluj Napoca, Romania

[4] Univ Calif San Diego, Dept Med, La Jolla, CA 92093 USA

来源：

DALTON TRANSACTIONS | 2011年 / 40卷 / 38期

基金：

美国国家卫生研究院;

关键词：

NITRIC-OXIDE; CYTOCHROME-P450; VITAMIN-B-12; MECHANISM; KINETICS; BINDING;

D O I：

10.1039/c1dt10219b

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Evidence for the formation of a unique, six-coordinate cobalamin(II) complex with the anion-radical SO2- during the reduction of aquacobalamin(III) by sodium dithionite, was obtained from spectrophotometric and EPR measurements. The pK(a) value of the weakly coordinated dimethylbenzimidazole group was found to be 4.8 +/- 0.1 at 25 degrees C.

引用

页码：9831 / 9834

页数：4

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