Structural basis of Fic-mediated adenylylation.

Structural basis of Fic-mediated adenylylation.
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DOI:
10.1038/nsmb.1867
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发表时间:
2010-08
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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Fic家族的腺苷基转移酶,由核心HPFx(D/E)GN(G/K)R基序列定义,由2700多种从细菌到人类发现的蛋白质组成。来自细菌病原体somni Histophilus的IbpA含有两个Fic结构域,可使rho家族gtpase的switch1 Tyr残基腺苷化,使细菌能够破坏宿主的防御。在这里,我们展示了IbpA的第二个Fic结构域(IbpAFic2)与其底物Cdc42配合物的结构。IbpAFic2结合的Cdc42模仿Rho GTPases的gdi结合状态,其switch1和switch2区域都被IbpAFic2控制。破坏IbpAFic2-Cdc42界面的突变损害腺苷化和细胞毒性。重要的是,Cdc42的switch1 Tyr在结构中被腺苷化,为这种翻译后修饰提供了第一个结构视图。我们还证明了核苷酸结合机制在Fic蛋白中是保守的,并提出了这个最近发现的酶家族的催化机制。
The Fic family of adenylyltransferases, defined by a core HPFx(D/E)GN(G/K)R motif, consist of over 2700 proteins found from bacteria to humans. IbpA from the bacterial pathogen Histophilus somni contains two Fic domains that adenylylate the switch1 Tyr residue of Rho-family GTPases, allowing the bacteria to subvert host defenses. Here we present the structure of the second Fic domain of IbpA (IbpAFic2) in complex with its substrate, Cdc42. IbpAFic2-bound Cdc42 mimics the GDI-bound state of Rho GTPases, with both its switch1 and switch2 regions gripped by IbpAFic2. Mutations disrupting the IbpAFic2-Cdc42 interface impair adenylylation and cytotoxicity. Importantly, the switch1 Tyr of Cdc42 is adenylylated in the structure, providing the first structural view for this post-translational modification. We also demonstrate that the nucleotide-binding mechanism is conserved among Fic proteins, and propose a catalytic mechanism for this recently discovered family of enzymes.
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发表时间: 2004-03-01
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作者:
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细菌效应器设计和功能的常见主题。
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