Glutamine deamidation and dysfunction of ubiquitin/NEDD8 induced by a bacterial effector family.

Glutamine deamidation and dysfunction of ubiquitin/NEDD8 induced by a bacterial effector family.
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DOI:
10.1126/science.1193844
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发表时间:
2010-09-03
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Shao F
Shao F
中科院分区:
其他
文献类型:
--
作者:
Cui J;Yao Q;Li S;Ding X;Lu Q;Mao H;Liu L;Zheng N;Chen S;Shao F

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A family of bacterial effectors including CHBP from Burkholderia pseudomallei and Cif from Enteropathogenic E. Coli (EPEC) adopt a functionally important papain-like hydrolytic fold. Here, CHBP is shown to be a potent inhibitor of the eukaryotic ubiquitination pathway. CHBP acts as a deamidase that specifically and efficiently deamidates Gln-40 in ubiquitin and NEDD8 both in vitro and during Burkholderia infection. Deamidated ubiquitin is impaired in supporting ubiquitin-chain synthesis. Cif selectively deamidates NEDD8, which abolishes rather than stimulates the activity of Cullin-RING ubiquitin ligases (CRLs). Ubiquitin-dependent degradation of multiple CRL substrates including key cell cycle regulators and small GTPase RhoA was impaired by Cif in EPEC-infected cells. Mutations of substrate-contacting residues in Cif abolish or attenuate Cif-induced cytopathic phenotypes of cell cycle arrest and actin stress fibers formation. Thus, NEDD8 deamidation might be the molecular mechanism underlying EPEC-induced cytopathic effect.
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