Carbon extension in peptidylnucleoside biosynthesis by radical SAM enzymes.

Carbon extension in peptidylnucleoside biosynthesis by radical SAM enzymes.
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DOI:
10.1038/nchembio.2187
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发表时间:
2016-11
影响因子:
14.8
通讯作者:
Yokoyama K
Yokoyama K
中科院分区:
生物学1区
文献类型:
--
作者:
Lilla EA;Yokoyama K

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尼可霉素和多抗霉素是抗真菌肽基核苷(PN)抗生素,对人类和植物病原体具有活性。在这里,我们报告说,在PN的生物合成链霉菌cacaoi和链霉菌tendae,C5′-延伸的核苷下游结构的多样化是必不可少的催化保守的自由基S-腺苷-L-甲硫氨酸(SAM)酶,PolH或NikJ。这与抗菌核苷的亲核机制不同,代表了核苷天然产物生物合成的一种新机制。
Nikkomycins and polyoxins are antifungal peptidylnucleoside (PN) antibiotics active against human and plant pathogens. Here, we report that during PN biosynthesis in Streptomyces cacaoi and Streptomyces tendae, the C5′-extension of the nucleoside essential for downstream structural diversification is catalyzed by a conserved radical S-adenosyl-L-methionine (SAM) enzyme, PolH or NikJ. This is distinct from the nucleophilic mechanism reported for antibacterial nucleosides and represents a novel mechanism of nucleoside natural product biosynthesis.
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