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. 1994 Nov 8;91(23):10928–10932. doi: 10.1073/pnas.91.23.10928

Specific interaction of the CD45 protein-tyrosine phosphatase with tyrosine-phosphorylated CD3 zeta chain.

T Furukawa 1, M Itoh 1, N X Krueger 1, M Streuli 1, H Saito 1
PMCID: PMC45139  PMID: 7526385

Abstract

The CD45 transmembrane protein-tyrosine phosphatase (PTPase, EC 3.1.3.48) plays an essential role in T-cell activation by activating the Lck and/or Fyn protein-tyrosine kinases. However, numerous experiments have indicated that CD45 may have both stimulatory and inhibitory roles in T-cell activation. Thus, it is unlikely that the two kinases are the sole substrates of the CD45 PTPase. Furthermore, the complex regulation of the alternative splicing of the extracellular domain in various leukocyte lineages also suggests additional roles for the CD45 PTPase. To identify such functions, it is necessary to identify physiologically relevant substrates of the CD45 PTPase other than the two protein-tyrosine kinases. To this end, we searched for high-affinity substrates of the CD45 PTPase among the tyrosine-phosphorylated T-cell proteins by using purified glutathione S-transferase-CD45 fusion molecules. The enzymatically inactive CD45 C828S mutant protein, in which the cysteine residue at the catalytic center was changed to a serine residue, bound tightly to the phosphorylated CD3 zeta chain. This binding was specific to CD45 PTPase, as neither the leukocyte common antigen-related molecule (LAR) PTPase nor the CD45-LAR hybrid PTPases bound the phosphorylated CD3 zeta chain. Furthermore, phosphorylated CD3 zeta chain was preferentially dephosphorylated by the wild-type CD45 PTPase under conditions that did not significantly dephosphorylate other cellular proteins. Thus, the phosphorylated CD3 zeta chain is a specific and high-affinity substrate of the CD45 PTPase. These results suggest that CD45 is involved in the termination of the T-cell response via dephosphorylation of CD3 zeta chain.

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