Conformational rearrangements enable iterative backbone N-methylation in RiPP biosynthesis.

Conformational rearrangements enable iterative backbone N-methylation in RiPP biosynthesis.
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DOI:
10.1038/s41467-021-25575-7
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发表时间:
2021-09-09
影响因子:
16.6
通讯作者:
Freeman MF
Freeman MF
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Miller FS;Crone KK;Jensen MR;Shaw S;Harcombe WR;Elias MH;Freeman MF

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肽骨架α-N-甲基化改变酰胺键的物理化学性质,以提供结构约束和其他有利特征,包括肽的生物膜渗透性。Borosin天然产物途径是目前已知的唯一一条核糖体编码和后修饰的肽(RIPPs)途径,它能在翻译的肽段上引入骨架α-N-甲基化。在这里,我们报告了IV型borosin天然产物途径(称为“分裂borosins”)的发现,具有迭代作用的α-N-甲基转移酶和单独的前体肽底物从金属呼吸细菌希瓦氏菌oneidensis。一系列酶-前体复合物揭示了α-N-甲基转移酶和底物的多种构象状态。沿着突变和动力学分析,我们的研究结果为RIPP迭代成熟的潜在策略提供了罕见的背景。Borosins是核糖体编码和后修饰肽(RiPP)的天然产物,具有酰胺骨架α-N-甲基化。在这里,作者报告了IV型borosin“分裂”途径编码不同的,单独的α-N-甲基转移酶和前体肽底物的发现和表征。
Peptide backbone α-N-methylations change the physicochemical properties of amide bonds to provide structural constraints and other favorable characteristics including biological membrane permeability to peptides. Borosin natural product pathways are the only known ribosomally encoded and posttranslationally modified peptides (RiPPs) pathways to incorporate backbone α-N-methylations on translated peptides. Here we report the discovery of type IV borosin natural product pathways (termed ‘split borosins’), featuring an iteratively acting α-N-methyltransferase and separate precursor peptide substrate from the metal-respiring bacterium Shewanella oneidensis. A series of enzyme-precursor complexes reveal multiple conformational states for both α-N-methyltransferase and substrate. Along with mutational and kinetic analyses, our results give rare context into potential strategies for iterative maturation of RiPPs. Borosins are ribosomally encoded and posttranslationally modified peptide (RiPP) natural products featuring amide-backbone α-N-methylation. Here, the authors report the discovery and characterization of type IV borosin ‘split’ pathways encoding distinct, separate α-N-methyltransferases and precursor peptide substrates.
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影响因子: 11.1
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DOI: 10.1016/s0040-4020(98)00209-9
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