Regulation of B Cell Antigen Receptor Signal Transduction and Phosphorylation by CD45
Abstract
CD45 is a member of a family of membrane proteins that possess phosphotyrosine phosphatase activity, and is the source of much of the tyrosine phosphatase activity in lymphocytes. In view of its enzymatic activity and high copy number, it seems likely that CD45 functions in transmembrane signal transduction by lymphocyte receptors that are coupled to activation of tyrosine kinases. The B cell antigen receptor was found to transduce a Ca2+-mobilizing signal only if cells expressed CD45. Also, both membrane immunoglobulin M (mIgM) and CD45 were lost from the surface of cells treated with antibody to CD45, suggesting a physical interaction between these proteins. Finally, CD45 dephosphorylated a complex of mIg-associated proteins that appears to function in signal transduction by the antigen receptor. These data indicate that CD45 occurs as a component of a complex of proteins associated with the antigen receptor, and that CD45 may regulate signal transduction by modulating the phosphorylation state of the antigen receptor subunits.
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Science
Volume 252 | Issue 5014
28 June 1991
28 June 1991
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© 1991.
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Published in print: 28 June 1991
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Cited by
- Crystal Structure of Human Protein Tyrosine Phosphatase 1B, Science, 263, 5152, (1397-1404), (1994)./doi/10.1126/science.8128219
- Tyrosine Phosphorylation of CD22 During B Cell Activation, Science, 258, 5084, (1001-1004), (1992)./doi/10.1126/science.1279802
- Protein Tyrosine Phosphatases: A Diverse Family of Intracellular and Transmembrane Enzymes, Science, 253, 5018, (401-406), (1991)./doi/10.1126/science.1650499
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