The cyclic dinucleotide c-di-AMP is an allosteric regulator of metabolic enzyme function.

The cyclic dinucleotide c-di-AMP is an allosteric regulator of metabolic enzyme function.
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DOI:
10.1016/j.cell.2014.07.046
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发表时间:
2014-09-11
期刊:
影响因子:
64.5
通讯作者:
Woodward JJ
Woodward JJ
中科院分区:
生物学1区
文献类型:
--
作者:
Sureka K;Choi PH;Precit M;Delince M;Pensinger DA;Huynh TN;Jurado AR;Goo YA;Sadilek M;Iavarone AT;Sauer JD;Tong L;Woodward JJ

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环二磷酸腺苷(c-di-AMP)是细菌生长和感染所需的广泛保守的第二信使。然而,c-di-AMP信号传导的分子机制仍然知之甚少。使用化学蛋白质组学筛选c-di-AMP相互作用的蛋白质在病原体单核细胞增生李斯特菌,我们确定了几个广泛保守的蛋白质受体,包括中央代谢酶丙酮酸羧化酶(LmPC)。LmPC-c-di-AMP相互作用的生物化学和晶体学研究揭示了一个以前未被识别的变构调节位点,距离活性位点25 μ m。该位点的突变破坏了c-di-AMP结合,并影响了致病性粪肠球菌的LmPC和PC的酶催化。C-di-AMP耗竭导致L.单核细胞增多症这种代谢失衡的纠正挽救了细菌生长,减少了细菌裂解,并导致感染期间细菌负荷增加。这些发现极大地扩展了c-di-AMP信号库,并揭示了环状二核苷酸的中心代谢调节作用。
Cyclic di-adenosine monophosphate (c-di-AMP) is a broadly conserved second messenger required for bacterial growth and infection. However, the molecular mechanisms of c-di-AMP signaling are still poorly understood. Using a chemical proteomics screen for c-di-AMP interacting proteins in the pathogen Listeria monocytogenes, we identified several broadly conserved protein receptors, including the central metabolic enzyme pyruvate carboxylase (LmPC). Biochemical and crystallographic studies of the LmPC-c-di-AMP interaction revealed a previously unrecognized allosteric regulatory site 25 Å from the active site. Mutations in this site disrupted c-di-AMP binding and affected enzyme catalysis of LmPC as well as PC from pathogenic Enterococcus faecalis. C-di-AMP depletion resulted in altered metabolic activity in L. monocytogenes. Correction of this metabolic imbalance rescued bacterial growth, reduced bacterial lysis, and resulted in enhanced bacterial burdens during infection. These findings greatly expand the c-di-AMP signaling repertoire and reveal a central metabolic regulatory role for a cyclic di-nucleotide.
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