对来自Akkermansia muciniphila的CobU的腺基胺-酸 guanylyltransferase活性进行结构洞察
Meiyu Jiang1, Chao Kong1, Qinghao Wei1
1School of Life Sciences, Anhui University, Hefei, 230601, Anhui, China; Institute of Health Sciences and Technology, Anhui University, Hefei, 230601, Anhui, China.
International journal of biological macromolecules
|September 21, 2025
概括
阿克尔曼西亚 (Akkermansia muciniphila) 通过一个救援途径合成胺. 研究人员确定了AmCobUU的身份.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 科巴胺是动物,细菌和古生物的必需营养素.
- 阿克尔曼西亚 (Akkermansia muciniphila) 缺乏新的胺合成,但利用了一个救援途径.
- 在A. muciniphila中,科巴胺前体AdoCbi-P的下游途径以前尚不清楚.
研究的目的:
- 为了阐明A. muciniphila.中的胺前体AdoCbi-P的下游途径.
- 描述AmCobU的酶活性和结构.
主要方法:
- 酶性测试以确定AmCobU活性.
- 进行X射线晶体学以确定AmCobU及其复合物的结构.
主要成果:
- AmCobU表现出AdoCbi-P guanylyltransferase的活性,将AdoCbi-P转化为AdoCbi-GDP. AmCobU具有AdoCbi-P guanylyltransferase的活性,可以将AdoCbi-P转化为AdoCbi-GDP.
- 晶体结构揭示了GTP和AdoCbi-P结合点,并强调了三元化对活性的重要性.
- 在AmCobU的 conformational 变化表明一个触媒机制涉及螺旋α2重新定位.
结论:
- 这项研究澄清了A. muciniphila.中的胺救援途径.
- 对AmCobU的结构洞察力为AdoCbi-P guanylyltransferase机制提供了更深入的理解.
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