title: Association of phosphatidylinositol 3-kinase with SHC in chronic myelogeneous leukemia cells.
abstract: Expression of p210 BCR/abl oncoprotein transforms hematopoietic cells. P210 BCR/abl tyrosine kinase induces tyrosine phosphorylation of Shc, and activation of p21ras and PI 3-Kinase. Here we show that PI 3-Kinase associates with Shc in cells transformed by BCR/abl oncoprotein. Immunoprecipitation of Shc from cells expressing p210 BCR/abl had 7.5-fold increase in PI 3-Kinase activity compared to parental cells. Tyrosine phosphorylated Shc specifically bound to the C-SH2 domain of the p85 subunit of PI 3-Kinase. The p85 SH3 domain also interacted with Shc in cell lysates from parental and transformed cells. The binding of p85 SH3 domain to Shc was substantially higher in BCR/abl transformed than in parental cells. Phenylphosphate blocked p85 SH2 mediated association with Shc but enhanced the binding of the p85 SH3 domain to Shc. The N-terminal proline-rich region of Shc between A263 and N273 specifically blocked the interaction of p85 SH3 domain with Shc. Our results indicate that PI 3-Kinase interacts with Shc directly in hematopoietic cells which express p210 BCR/abl oncoprotein.
authors.affiliation: Department of Medicine, St. Elizabeth's Medical Center, Tufts University School of Medicine, Boston Massachusetts 02135, USA.
authors.forename: D
authors.initials: D
authors.lastname: Harrison-Findik
authors.forename: M
authors.initials: M
authors.lastname: Susa
authors.forename: L
authors.initials: L
authors.lastname: Varticovski
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D016044:Fusion Proteins, bcr-abl / Q000378:metabolism*; D051380:GRB2 Adaptor Protein; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D019869:Phosphatidylinositol 3-Kinases; D010766:Phosphorylation; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000378:metabolism*; D019000:Phosphotyrosine; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism*; D055765:Shc Signaling Adaptor Proteins; D015398:Signal Transduction; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D013329:Structure-Activity Relationship; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D051380:GRB2 Adaptor Protein; C495949:Grb2 protein, mouse; D011506:Proteins; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D019000:Phosphotyrosine; D014443:Tyrosine; D019869:Phosphatidylinositol 3-Kinases; D017853:Phosphotransferases (Alcohol Group Acceptor); D016044:Fusion Proteins, bcr-abl