The BioGRID | PUBLICATION VIEW

	Nat. Immunol. Jan (2004); 5(1):45-54
Two isoforms of otubain 1 regulate T cell anergy via GRAIL.
Soares L, Seroogy C, Skrenta H, Anandasabapathy N, Lovelace P, Chung CD, Engleman E, Fathman CG
Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract: The active ubiquitin E3 ligase GRAIL is crucial in the induction of CD4 T cell anergy. Here we show that GRAIL is associated with and regulated by two isoforms of the ubiquitin-specific protease otubain 1. In lethally irradiated mice reconstituted with bone marrow cells from T cell receptor-transgenic mice retrovirally transduced to express the genes encoding these proteases, otubain 1-expressing cells contained negligible amounts of endogenous GRAIL, proliferated well and produced large amounts of interleukin 2 after antigenic stimulation. In contrast, cells expressing the alternatively spliced isoform, otubain 1 alternative reading frame 1, contained large amounts of endogenous GRAIL and were functionally anergic, and they proliferated poorly and produced undetectable interleukin 2 when stimulated in a similar way. Thus, these two proteins have opposing epistatic functions in controlling the stability of GRAIL expression and the resultant anergy phenotype in T cells.
[PUBMED: 14661020]