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循环二核酸c-di-AMP是代谢酶功能的全调节剂

Kamakshi Sureka¹, Philip H Choi², Mimi Precit¹

¹Department of Microbiology, University of Washington, Seattle, WA 98195, USA.

|September 13, 2014

概括

循环二氨酸单酸盐 (c-di-AMP) 对细菌生长至关重要. 这项研究揭示了c-di-AMP通过与pyruvate carboxylase结合来调节细菌代谢,影响感染.

科学领域:

微生物学微生物学
分子生物学分子生物学
生物化学生物化学

背景情况:

循环二氨酸单酸盐 (c-di-AMP) 是细菌中的关键的第二信使,对生长和感染至关重要.
控制c-di-AMP信号通路的精确分子机制在很大程度上仍未被阐明.

研究的目的:

在Listeria monocytogenes中识别新的c-di-AMP相互作用蛋白.
阐明c-di-AMP在细菌代谢和感染中的调节作用.

主要方法:

化学蛋白质学选用于识别c-di-AMP结合蛋白.
生物化学测定和X射线晶体学,以表征蛋白质-连接体相互作用.
基因操纵以评估c-di-AMP耗尽对细菌生理学和感染的影响.

主要成果:

酸盐碳化酶 (LmPC) 被确定为Listeria monocytogenes中的c-di-AMP受体.
在LmPC上特征了一种新型的全调节部位,与活性部位不同,调解c-di-AMP结合并影响催化活性.
破坏c-di-AMP与LmPC结合导致代谢失调,影响细菌生长,溶解和感染负担.

结论:

这项研究揭示了c-di-AMP在通过pyruvate carboxylase调节中央细菌代谢方面以前未知的作用.
这些发现扩大了已知的c-di-AMP信号通路的范围,并突出了其在细菌病变发生过程中的重要性.

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