Structure of the cyclomodulin Cif from pathogenic Escherichia coli.

Structure of the cyclomodulin Cif from pathogenic Escherichia coli.
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DOI:
10.1016/j.jmb.2008.09.051
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发表时间:
2008-12-12
影响因子:
5.6
通讯作者:
Stebbins, C. Erec
Stebbins, C. Erec
中科院分区:
生物学2区
文献类型:
--
作者:
Hsu, Yun;Jubelin, Gregory;Taieb, Frederic;Nougayrede, Jean-Philippe;Oswald, Eric;Stebbins, C. Erec

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细菌病原体已经进化出一系列复杂的毒力因子来调节宿主细胞生物学。肠源性和肠出血性大肠杆菌(EPEC和EHEC)使用III型蛋白分泌系统(T3SS)将微生物蛋白注入宿主细胞。EPEC和EHEC产生的T3SS效应周期抑制因子(Cif)能够阻断宿主真核细胞周期进程。我们在这里展示了Cif的晶体结构,揭示了它是包括半胱氨酸蛋白酶和乙酰基转移酶在内的酶超家族中一个不同的成员,它们共享一个共同的催化三联体。这些保守的活性位点残基的突变会取消Cif阻止细胞周期进展的能力。最后,我们证明了不可逆半胱氨酸蛋白酶抑制剂不能消除Cif的细胞病变效应,这表明另一种酶活性可能是该毒力因子的生物学活性的基础。
Bacterial pathogens have evolved a sophisticated arsenal of virulence factors to modulate host cell biology. Enteropathogenic and enterohemorrhagic Escherichia coli (EPEC and EHEC) use a type III protein secretion system (T3SS) to inject microbial proteins into host cells. The T3SS effector cycle inhibiting factor (Cif) produced by EPEC and EHEC is able to block host eukaryotic cell-cycle progression. We present here a crystal structure of Cif, revealing it to be a divergent member of the superfamily of enzymes including cysteine proteases and acetyltransferases that share a common catalytic triad. Mutation of these conserved active site residues abolishes the ability of Cif to block cell-cycle progression. Finally, we demonstrate that irreversible cysteine protease inhibitors do not abolish the Cif cytopathic effect, suggesting that another enzymatic activity may underlie the biological activity of this virulence factor.
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发表时间: 2003-12-01
影响因子: 3.6
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通讯作者: Oswald, E
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期刊: SCIENCE
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