RADIOLABELING OF CATALYTIC SUBUNITS OF PI-3-KINASES WITH 17-BETA-HYDROXY-16-ALPHA-[I-125]IODOWORTMANNIN - IDENTIFICATION OF THE G-BETA-GAMMA-SENSITIVE ISOFORM AS A COMPLEX COMPOSED OF 46-KDA AND 100-KDA SUBUNITS

A fungal metabolite, wortmannin, is a potent inhibitor of phosphatidylinositol (PI) 3-kinases. In the present study, we prepared a radio-labeled derivative of wortmannin, 17 beta-hydroxy-16 alpha-[I-125] iodowortmannin. The compound bound tightly to a 110-kDa subunit in the previously identified isoform of PI 3-kinase (p85/p110), and also to a 100-kDa peptide in a partially purified preparation of another isoform of PI 3-kinase whose activity was markedly stimulated by the beta gamma subunits of GTP-binding proteins (G beta gamma). The binding to both peptides was inhibited by non-radiolabeled wortmannin and also by LY294002, another inhibitor of PI 3-kinases. An antibody against p85 recognized a 46-kDa peptide in the G beta gamma-sensitive isozyme and precipitated the 100-kDa peptide specifically labeled with 17 beta-hydroxy-16 alpha-[I-125] iodowortmannin. These results suggested that the newly found isozyme was a complex composed of 46-kDa and 100-kDa peptides. (C) 1995 Academic Press, Inc.