来自肠道细菌的糖原酸化酶的结构和机制多样性
Keigo Shobu1, Mayu Takai1, Hiroki Tanino1
1Division of Advance Pharmaco-Science, School of Pharmaceutical Sciences, The University of Osaka, Suita, Osaka 565-0871, Japan.
概括
肠道细菌的糖原酸化酶 (GPs) 呈现出多样化的结构和调节. 腺单酸盐 (AMP) 影响一些全科医生,影响其活性,并可能主持葡萄糖代谢.
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:
- 糖原酸化酶 (GP) 对于糖原代谢至关重要.
- 哺乳动物的GP结构和调节是众所周知的,但肠道细菌的GP机制却不是.
- 肠道细菌的GP在遗传学上是多样化的,包括来自*大肠杆菌* (EcGP),*Segatella copri* (ScGP) 和*Dorea longicatena* (DlGP) 的.
研究的目的:
- 来自三个不同的基因组群的肠道细菌GPs的结构和调节机制的调查.
- 了解腺单酸盐 (AMP) 如何影响这些细菌GP的活性和寡合化.
- 探索细菌GP多样性对宿主葡萄糖恒温的影响.
主要方法:
- 使用酶性测试来测量酶活性.
- 低温电子显微镜 (cryo-EM) 确定了高分辨率的结构.
- 射线晶体学提供了进一步的结构见解.
主要成果:
- *Sc*GP形成了一个独特的AMP调节的体,在二元化后抑制活性.
- *Ec*GP存在于多个寡合体状态,AMP通过促进四聚体解离来增强活性.
- *Dl*GP 仍然是单质的,对AMP没有反应.
- 寡合体状态和AMP结合显著调节基质可访问性和酶激活.
结论:
- 肠道细菌的全科医生表现出显著的结构和监管多样性,与正规模型不同.
- 细菌性GPs的寡合状态是它们性调节的关键因素.
- 了解细菌的GP调节,可以了解微生物组对宿主葡萄糖平衡和胰岛素敏感性的作用.
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