Nature Immunology5, 883 - 890 (2004)
Published online: 27 August 2004; | doi:10.1038/ni1106
E3 ubiquitin ligases as T cell anergy factors
Daniel L Mueller
Department of Medicine, Division of Rheumatic and Autoimmune Diseases, Center for Immunology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.
Correspondence should be addressed to Daniel L Mueller muell002@umn.edu
E3 ubiquitin ligases have emerged as key molecular regulators of immune cell function. Three families of proteins with ubiquitin ligase activity have been described (the HECT, RING and U-box proteins), and each may be involved in the regulation of immune responses during infection by targeting specific inhibitory molecules for proteolytic destruction. Several HECT and RING E3 proteins have now also been linked to the induction and maintenance of immune self-tolerance: c-Cbl, Cbl-b, GRAIL, Itch and Nedd4 each negatively regulate T cell growth factor production and proliferation. This review will discuss the relationship between the ubiquitination of select components of the antigen-sensing signaling apparatus in T cells and the development and maintenance of the clonal anergy state.
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