Pseudomonadal itaconate 降解基因集群编码了用于甲基酸盐利用的酶
Lena Gonner1, Eric A Cassens1, Simone König2
1Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany.
Communications biology
|July 24, 2025
概括
这项研究确定了新的酶,使细菌能够利用两种形式的甲基糖酸盐,这是一个关键的代谢中间体. 这些发现突显了甲基糖酸盐的含量.
科学领域:
- 微生物的新陈代谢和生物化学
- 酶学和蛋白质功能的研究
- 细菌生理学 细菌生理学
背景情况:
- 分支链C5-二碳酸和它们的CoA-是重要的细菌代谢中间体.
- 伊塔科纳酸作为一种抗微生物,免疫调节剂和细菌生长基质.
- 伊塔康酸盐降解途径涉及特定的酶,在沙性细菌中发现了额外的基因.
研究的目的:
- 来自Cupriavidus necator和Pseudomonas aeruginosa的伊塔科纳酸降解集群中的其他基因的功能.
- 阐明这些酶在甲基糖酸盐代谢中的作用.
- 为了研究甲基糖酸盐异构酶的流行率和催化机制.
主要方法:
- 来自Cupriavidus necator和Pseudomonas aeruginosa的异质蛋白质的生产.
- 酶分析测试以确定产生的蛋白质的催化活性.
- 甲基糖酸异构酶分布和保存的氨基酸残留物的生物信息分析.
主要成果:
- 已识别的蛋白质催化了 (RS) - 甲基糖-C4-CoA脱酶和 (S) - 甲基糖酸盐异构酶反应.
- 这些酶与伊塔康酸CoA转移酶一起,使得两种甲基糖酸立体异构体的利用成为可能.
- 甲基糖酸异相酶存在于1.6%的被测序 prokaryotes,主要是贝塔蛋白质细菌.
结论:
- 描述的酶扩展了已知的伊塔科纳酸降解途径,包括甲基糖酸利用.
- 甲基糖氨酸异构酶和相关的MmgE/PrpD蛋白可能共享一个共同的催化机制,涉及酸盐中间体.
- 在广泛的伊塔科纳酸降解集群中,甲基糖酸利用基因的同时出现表明了环境意义.
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