Structural basis for methyl transfer by a radical SAM enzyme.
Structural basis for methyl transfer by a radical SAM enzyme.
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自由基 SAM 酶进行甲基转移的结构基础。
DOI:
10.1126/science.1205358
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发表时间:
2011-05-27
期刊:
影响因子:
--
通讯作者:
Rosenzweig AC
中科院分区:
文献类型:
--
作者:
Boal AK;Grove TL;McLaughlin MI;Yennawar NH;Booker SJ;Rosenzweig AC
The radical SAM (RS) enzymes RlmN and Cfr methylate 23S ribosomal RNA, modifying the C2 or C8 position of adenosine 2503. The methyl groups are installed by a two-step sequence involving initial methylation of a conserved Cys residue (RlmN Cys 355) by SAM. Methyl transfer to the substrate requires reductive cleavage of a second equivalent of SAM. Crystal structures of RlmN and RlmN with SAM show that a single molecule of SAM coordinates the [4Fe-4S] cluster. Residue Cys 355 is S-methylated and located proximal to the SAM methyl group, suggesting that SAM involved in the initial methyl transfer binds at the same site. Thus, RlmN accomplishes its complex reaction with structural economy, harnessing the two most important reactivities of SAM within a single site.
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