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Modulation of protein tyrosine phosphorylation during G1/S transition in activated human T-lymphoblasts. by Y Churcher; S E Moss is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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We report that in activated human T-lymphoblasts synchronized early in the G1-phase of the cell cycle, addition of interleukin 2 (IL-2) stimulates transition into S-phase in conjunction with specific and reproducible protein tyrosine phosphorylation events. Prominent among these was de novo phosphorylation of the p56lck tyrosine kinase, which appeared as a single polypeptide on SDS-polyacrylamide gel electrophoresis prior to the addition of IL-2, but as a doublet of approximately 56 and 59 kDa 3 h after IL-2 addition. Although the lck polypeptide doublet persisted into S-phase, the 59-kDa form was virtually undetectable in T-lymphoblasts in log phase growth. In T-lymphoblasts metabolically labeled with 32Pi, antiphosphotyrosine antisera identified a major 56-kDa tyrosine-phosphorylated protein, whereas antisera to lck showed that phosphorylation of lck occurred on both the 56- and 59-kDa forms. Phosphoamino acid analyses identified phosphoserine as the major phosphoamino acid on both of the lck polypeptides, although small amounts of phosphotyrosine were also detected on the 56-kDa form. Immune complex kinase assays revealed that only the lower band of the lck doublet exhibited aut

Who reads Modulation of protein tyrosine phosphorylation during G1/S transition in activated human T-lymphoblasts.?

Author

Y Churcher; S E Moss

Publisher

Elsevier BV

Published

1993

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)