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Yersinia virulence factor YopJ acts as a deubiquitinase to inhibit NF-κB activation.

Authors :
Honglin Zhou
Monack, Denise M.
Kayagaki, Nobuhiko
Wertz, Ingrid
Jianpin Yin
Wolf, Beni
Dixit, Vishva M.
Source :
Journal of Experimental Medicine; 11/21/2005, Vol. 202 Issue 10, p1327-1332, 6p
Publication Year :
2005

Abstract

The bacterial pathogens of the genus Yersinia, the causative agents of plague, septicemia, and gastrointestinal syndromes, use a type III secretion system to inject virulence factors into host target cells. One virulence factor, YopJ, is essential for the death of infected macrophages and can block host proinflammatory responses by inhibiting both the nuclear factor κB (NF-κB) and mitogen-activated protein kinase pathways, which might be important for evasion of the host immune response and aid in establishing a systemic infection. Here, we show that YopJ is a promiscuous deubiquitinating enzyme that negatively regulates signaling by removing ubiquitin moieties from critical proteins, such as TRAF2, TRAF6, and IκBα. In contrast to the cylindromatosis tumor suppressor CYLD, which attenuates NF-κB signaling by selectively removing K63-linked polyubiquitin chains that activate IκB kinase, YopJ also cleaves K48-linked chains and thereby inhibits proteasomal degradation of IκBα. YopJ, but not a catalytically inactive YopJ mutant, promoted deubiquitination of cellular proteins and cleaved both K48- and K63-linked polyubiquitin. Moreover, an in vitro assay was established to demonstrate directly the deubiquitinating activity of purified YopJ. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00221007
Volume :
202
Issue :
10
Database :
Supplemental Index
Journal :
Journal of Experimental Medicine
Publication Type :
Academic Journal
Accession number :
19382748
Full Text :
https://doi.org/10.1084/jem.20051194