Cobalt: B12 Enzymes and Coenzymes
Cobalt: B12 Enzymes and Coenzymes
复制标题
钴:B12 酶和辅酶
DOI:
10.1002/9781119951438.eibc0043.pub2
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发表时间:
2013
影响因子:
4.3
通讯作者:
B. Kräutler
中科院分区:
文献类型:
--
作者:
B. Kräutler
Cobalt has its important biological role as metal center of vitamin B12 and of its cofactor variants. The natural B12 derivatives are remarkably complex cobalt-corrins and belong to the larger class of the tetrapyrrolic natural products. The cofactor forms of vitamin B12, the antipernicious anemia factor, are required for human and animal health. With the exception of the (higher) plants, most forms of life appear to depend on vitamin B12 and its natural derivatives. The corrinoids play a particularly basic role in carbon metabolism in archaea and bacteria, which are the only natural sources of the B12 derivatives. These microorganisms have developed extraordinary means for the biosynthesis of the B12 derivatives and for its regulation, in order to cope with the structural and functional complexity of the cobalt-corrinoids. The other B12-dependent forms of life have evolved intricate strategies for the economic and efficient uptake and transport of the corrinoids. The known cofactor functions of the cobalt-corrinoids are due to their extraordinary organometallic chemistry, coupled with their redox chemistry under physiological conditions: adenosylcorrinoids, methylcorrinoids, and reduced corrinoids are the cofactors in various important and unique organometallic enzymes, whose intricate structural and mechanistic properties have been the focus of extensive research activities. The essential role of the corrinoids in organometallic paths of carbon fixation and further carbon metabolism in anerobic microorganisms has attracted particular attention. Indeed, the main chemical reactivity of the corrinoids and their essential biological roles may reflect their possible contributions to the early stages of life on earth. Vitamin B12 and its derivatives thus hold an important position in the life sciences and are at the center of interdisciplinary interests from medicine, biology, chemistry, and physics.
Keywords:
bioorganometallic chemistry;
biosynthesis;
cobalt;
corrin;
electron transfer;
methylation;
methyl transfer;
organometallic chemistry;
radical reactions;
rearrangement reactions;
synthesis;
vitamin B12
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DOI:
10.1074/jbc.274.11.7039
发表时间:
1999
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Lawrence,CC;Gerfen,GJ;Samano,V;Nitsche,R;Robins,MJ;Rétey,J;Stubbe,J
通讯作者:
Stubbe,J
影响因子:
6.8
作者:
Matthews, Rowena G.;Koutmos, Markos;Datta, Supratim
通讯作者:
Datta, Supratim
DOI:
10.1021/ja054374
发表时间:
2006
期刊:
Journal of the American Chemical Society.
影响因子:
--
作者:
Shiang,JosephJ;Cole,AllwynG;Sension,RoseanneJ;Hang,Kun;Weng,Yuxiang;Trommel,JennaS;Marzilli,LuigiG;Lian,Tianquan
通讯作者:
Lian,Tianquan
影响因子:
2.9
作者:
Park,Kiyoung;Mera,PaolaE;Escalante-Semerena,JorgeC;Brunold,ThomasC
通讯作者:
Brunold,ThomasC
影响因子:
2.9
作者:
Taurog, RE;Matthews, RG
通讯作者:
Matthews, RG