MODULATION OF PROTEIN-TYROSINE PHOSPHORYLATION DURING G(1) S TRANSITION IN ACTIVATED HUMAN T-LYMPHOBLASTS/

We report that in activated human T-lymphoblasts synchronized early in the G1-phase of the cell cycle, addition of interleukin 2 (IL-2) stim ulates transition into S-phase in conjunction with specific and reprod ucible protein tyrosine phosphorylation events. Prominent among these was de novo phosphorylation of the p56lck tyrosine kinase, which appea red as a single polypeptide on SDS-polyacrylamide gel electrophoresis prior to the addition of IL-2, but as a doublet of approximately 56 an d 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 l abeled with P-32i, antiphosphotyrosine antisera identified a major 56- kDa tyrosine-phosphorylated protein, whereas antisera to lck showed th at phosphorylation of lck occurred on both the 56- and 59-kDa forms. P hosphoamino acid analyses identified phosphoserine as the major phosph oamino 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 ex hibited autocatalytic activity. Furthermore, the 59-kDa form neither d isplayed autocatalytic activity, nor was it a substrate for phosphoryl ation by the 56-kDa form. We conclude that entry into S-phase in activ ated human T-lymphoblasts is associated with tyrosine phosphorylation of a limited number of proteins and suggest that p56lck activity is re gulated during G1/S.