The Fic protein Doc uses an inverted substrate to phosphorylate and inactivate EF-Tu.

The Fic protein Doc uses an inverted substrate to phosphorylate and inactivate EF-Tu.
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FIC蛋白DOC使用倒立的底物磷酸化和失活的EF-TU。

DOI:
10.1038/nchembio.1364
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发表时间:
2013-12
影响因子:
14.8
通讯作者:
Zenkin, Nikolay
Zenkin, Nikolay
中科院分区:
生物学1区
文献类型:
--
作者:
Castro-Roa, Daniel;Garcia-Pino, Abel;De Gieter, Steven;van Nuland, Nico A. J.;Loris, Remy;Zenkin, Nikolay

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Fic蛋白普遍存在于生命的所有领域中,并且通过靶蛋白的AMP化(AMP向靶蛋白的转移)在多种细胞过程中发挥关键作用。来自doc/phd毒素/抗毒素模块的Doc是Fic家族的成员,并通过未知机制抑制细菌翻译。在这里,我们表明,在预测的AMPylating活性相反,文件是一种新型的激酶,通过磷酸化的翻译延伸因子EF-Tu的保守的苏氨酸(Thr 382),使其无法结合氨酰化的tRNA抑制细菌翻译。我们提供的证据表明,EF-Tu磷酸化偏离AMP化的NTP相对于保守的Fic催化核心的DOC的催化残基的反平行结合。这些结果为EF-Tu磷酸化在细菌生理学中的机制和作用提供了新的见解,并代表了酶的催化可塑性和新酶活性进化机制的一个例子。
Fic proteins are ubiquitous in all domains of life and play critical roles in multiple cellular processes through AMPylation of (transfer of AMP to) target proteins. Doc from the doc/phd toxin/antitoxin module is a member of the Fic family and inhibits bacterial translation by an unknown mechanism. Here we show that, in contrast to the predicted AMPylating activity, Doc is a new type of kinase that inhibits bacterial translation by phosphorylating the conserved threonine (Thr382) of the translation elongation factor EF-Tu, rendering it unable to bind aminoacylated tRNAs. We provide evidence that EF-Tu phosphorylation diverged from AMPylation by antiparallel binding of the NTP relative to the catalytic residues of the conserved Fic catalytic core of Doc. The results bring insights into the mechanism and role of phosphorylation of EF-Tu in bacterial physiology as well as represent an example of catalytic plasticity of enzymes and a mechanism for the evolution of new enzymatic activities.
DOI: 10.1107/s0021889803012779
发表时间: 2003-10-01
影响因子: 6.1
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