p56lck phosphorylation by Ca2+/calmodulin-dependent protein kinase type II.

Abstract:

:Ca2+/calmodulin-dependent protein kinases are implicated in regulating the Ca2+ signaling involved in T cell activation and in thymocyte selection. One of the earliest events in signaling through the T cell antigen receptor is activation of the protein tyrosine kinase p56lck. Following T cell activation or signaling through the IL-2 receptor, Ca(2+)-mediated phosphorylation of p56lck occurs on serine/threonine residues. Isoforms of the multifunctional Ca2+/calmodulin-dependent protein kinases, CaM kinase-II and CaM kinase-Gr are found in human T lymphocytes. CaM kinase-II, but not CaM kinase-Gr, phosphorylates the T cell tyrosine kinase p56lck in vitro. Tryptic phosphopeptide maps indicate that CaM kinase-II phosphorylates p56lck on multiple sites in vitro. Kinase assays of p56lck modified by CaM kinase-II indicate that CaM kinase-II modification does not appreciably affect p56lck phosphotransfer activity.

authors

Bland MM,McDonald OB,Carrera AC

doi

10.1006/bbrc.1994.1010

subject

Has Abstract

pub_date

1994-01-14 00:00:00

pages

67-73

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(84)71010-2

journal_volume

198

pub_type

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