The bacterial arginine glycosyltransferase effector NleB preferentially modifies Fas-associated death domain protein (FADD)
Details
Publication Year 2017, Volume 292, Issue #42, Page 17337-17350
Journal Title
Journal of Biological Chemistry
Publication Type
Journal Article
Abstract
The inhibition of host innate immunity pathways is essential for the persistence of attaching and effacing (A/E) pathogens such as enteropathogenic Escherichia coli (EPEC) and Citrobacter rodentium during mammalian infections. To subvert these pathways and suppress the antimicrobial response, A/E pathogens use type III secretion systems (T3SS) to introduce effectors targeting key signaling pathways in host cells. One such effector is the arginine glycosyltransferase NleB1 (NleBCR in C. rodentium) that modifies conserved arginine residues in death domain-containing host proteins with N-acetylglucosamine (GlcNAc), thereby blocking extrinsic apoptosis signaling. Ectopically expressed NleB1 modifies the host proteins Fas-associated via death domain (FADD), TNFRSF1A-associated via death domain (TRADD), and receptor-interacting serine/threonine kinase 1 (RIPK1). However, the full repertoire of arginine-GlcNAcylation induced by pathogen-delivered NleB1 is unknown. Using an affinity proteomic approach for measuring arginine-GlcNAcylated glycopeptides, we assessed the global profile of arginine-GlcNAcylation during ectopic expression of NleB1, EPEC infection in vitro, or C. rodentium infection in vivo. NleB overexpression resulted in arginine-GlcNAcylation of multiple host proteins. However, NleB delivery during EPEC and C. rodentium infection caused rapid and preferential modification of Arg-117 in FADD. This FADD modification was extremely stable and insensitive to physiological temperatures, glycosidase activies or host cell degradation. Despite its stability and effect on the inhibition of apoptosis, arginine-GlcNAcylation did not elicit any proteomic changes, even in response to prolonged NleB1 expression. We conclude that at normal levels of expression during bacterial infection, NleB1/NleBCR antagonizes death receptor-induced apoptosis of infected cells by modifying FADD in an irreversible manner.
Publisher
ASBMB
WEHI Research Division(s)
Systems Biology And Personalised Medicine
PubMed ID
28860194
Rights Notice
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Creation Date: 2017-09-06 11:18:10
Last Modified: 2018-05-04 12:20:50
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