Insights into methionine S-methylation in diverse organisms.

Insights into methionine S-methylation in diverse organisms.
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深入了解不同生物体中的蛋氨酸 S-甲基化

DOI:
10.1038/s41467-022-30491-5
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发表时间:
2022-05-26
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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二甲基磺基丙酸酯(DMSP)是一种重要的海洋抗应激化合物,在全球营养循环、趋化性和潜在的气候调节中起着关键作用。最近,各种海洋放线菌,α-和γ-变形菌被证明通过甲硫氨酸(Met)S-甲基转移酶(MmtN)启动DMSP合成,产生S-甲基-Met(SMM)。在这里,我们的特点玫瑰细菌MmtN,提供结构和机制的见解,这DMSP合成酶。我们建议,MmtN使用的接近和去溶剂化机制的Met S-甲基化与两个相邻的MmtN单体组成的Met结合位点。我们还确定了不同的功能MmtN酶在潜在的共生古菌Escheridatus Woesearchaeota和候选门辐射(CPR)细菌,和animalcule Adineta steineri,预计不会产生SMM和/或DMSP。这些不同的MmtN酶,以及具有与MmtN同源的N-末端的较大植物MMT酶,可能利用相同的邻近和去溶剂化机制。这项研究提供了重要的见解SMM和/或DMSP生产的催化机制,并提出了这些化合物在次级代谢产物的生产,SMM循环在不同的生物体和环境中的作用。S-甲基蛋氨酸(SMM)是合成二甲基磺基丙酸酯(DMSP)的关键分子,DMSP是一种重要的海洋抗应激化合物,在全球营养循环中发挥重要作用。在这里,作者确定了SMM合成的机制,并发现了SMM在古细菌,CPR细菌和动物中的意想不到的作用。
Dimethylsulfoniopropionate (DMSP) is an important marine anti-stress compound, with key roles in global nutrient cycling, chemotaxis and, potentially, climate regulation. Recently, diverse marine Actinobacteria, α- and γ-proteobacteria were shown to initiate DMSP synthesis via the methionine (Met) S-methyltransferase enzyme (MmtN), generating S-methyl-Met (SMM). Here we characterize a roseobacterial MmtN, providing structural and mechanistic insights into this DMSP synthesis enzyme. We propose that MmtN uses the proximity and desolvation mechanism for Met S-methylation with two adjacent MmtN monomers comprising the Met binding site. We also identify diverse functional MmtN enzymes in potentially symbiotic archaeal Candidatus Woesearchaeota and Candidate Phyla Radiation (CPR) bacteria, and the animalcule Adineta steineri, not anticipated to produce SMM and/or DMSP. These diverse MmtN enzymes, alongside the larger plant MMT enzyme with an N-terminus homologous to MmtN, likely utilize the same proximity and desolvation mechanism. This study provides important insights into the catalytic mechanism of SMM and/or DMSP production, and proposes roles for these compounds in secondary metabolite production, and SMM cycling in diverse organisms and environments. S-methyl methionine (SMM) is a key molecule in production of dimethylsulfoniopropionate (DMSP), an important marine anti-stress compound, with roles in global nutrient cycling. Here, the authors determine the mechanism of SMM synthesis and uncover unexpected roles for SMM in archaea, CPR bacteria and animals.
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发表时间: 2000-08-01
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发表时间: 2015-08-11
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