作者: C. Pleiman , W. Hertz , J. Cambier
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摘要: Engagement of antigen receptor complexes induces rapid activation Src-family kinases and association with phosphatidylinositol-3' kinase (PI-3 kinase). Here it was found that the Src homology 3 (SH3) domain Lyn Fyn bound to a proline-rich region (residues 84 99) within 85-kilodalton subunit (p85) PI-3 kinase. The binding SH3 purified led five- sevenfold increase in specific activity Ligand-induced stimulation activated kinase, this blocked by peptide containing residues 99 p85. These data demonstrate mechanism for show domains target sequences can regulate enzymatic activity.