A 32-kD GTP-binding protein associated with the CD4-p56lck and CD8-p56lck T-cell receptor complexes
The guanosine triphosphate (GTP)-binding proteins include signal-transducing heterotrimeric G proteins (for example, Gs, Gi), smaller GTP-binding proteins that function in protein sorting, and the oncogenic protein p21ras. The T cell receptor complexes CD4-p56lck and CD8-p56lck were found to include a 32- to 33-kilodalton phosphoprotein (p32) that was recognized by an antiserum to a consensus GTP-binding region in G proteins. Immunoprecipitated CD4 and CD8 complexes bound GTP and hydrolyzed it to guanosine diphosphate (GDP). The p32 protein was covalently linked to [alpha-32P]GTP by ultraviolet photoaffinity labeling. These results demonstrate an interaction between T cell receptor complexes and an intracellular GTP-binding protein.
Janice T. Telfer and C.E. Rudd. "A 32-kD GTP-binding protein associated with the CD4-p56lck and CD8-p56lck T-cell receptor complexes" Science 254 (1991): 439-441.
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