Radical SAM-dependent carbon insertion into the nitrogenase M-cluster.
Radical SAM-dependent carbon insertion into the nitrogenase M-cluster.
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DOI:
10.1126/science.1224603
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发表时间:
2012-09-28
期刊:
影响因子:
--
通讯作者:
Ribbe MW
中科院分区:
文献类型:
--
作者:
Wiig JA;Hu Y;Chung Lee C;Ribbe MW
The active site of nitrogenase, M-cluster, is a metal-sulfur cluster containing a carbide at its core. Using radiolabeling experiments, we show that this carbide originates from the methyl group of S-adenosylmethionine (SAM) and that it is inserted into the M-cluster by the assembly protein NifB. Our SAM cleavage and deuterium substitution analyses suggest similarity between the mechanism of carbon insertion by NifB and the proposed mechanism of RNA methylation by the radical SAM enzymes RlmN and Cfr, which involves methyl transfer from one SAM equivalent, followed by hydrogen atom abstraction from the methyl group by a 5′-deoxyadenosyl radical generated from a second SAM equivalent. This work is an initial step toward unraveling the significance of the interstitial carbide and providing insights into the nitrogenase mechanism.
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DOI:
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发表时间:
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期刊:
Science (New York, N.Y.)
影响因子:
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发表时间:
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影响因子:
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