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. 1987 Oct 1;247(1):165–174. doi: 10.1042/bj2470165

Evidence for two distinct phosphatidylinositol kinases in fibroblasts. Implications for cellular regulation.

M Whitman 1, D Kaplan 1, T Roberts 1, L Cantley 1
PMCID: PMC1148384  PMID: 2825654

Abstract

Phosphatidylinositol (PtdIns) kinase activities from non-transformed and polyoma-middle-T-transformed murine fibroblasts were examined. Both normal and transformed 3T3 fibroblasts have two PtdIns kinases, which can be separated by anion-exchange chromatography. One of these activities (Type I) has a Km for ATP of 10 microM, is resistant to inhibition by adenosine, AMP or ADP, and is inhibited by non-ionic detergents. The other activity (Type II) has a somewhat higher Km for ATP (35 microM) and is inhibited competitively by ADP, AMP and adenosine at concentrations suggesting regulation of this activity by the energy charge of the cell. The Type II PtdIns kinase is activated by non-ionic detergents. We have previously reported the specific association of a PtdIns kinase activity with polyoma-middle-T immunoprecipitates [Whitman, Kaplan, Schaffhausen, Cantley & Roberts (1985) Nature (London) 315, 239-242; Kaplan, Whitman, Schaffhausen, Raptis, Garcea, Pallas, Roberts & Cantley (1986) Proc. Natl. Acad. Sci. U.S.A. 83, 3624-3628]. Comparison of the immunoprecipitated PtdIns kinase with the activities identified by ion-exchange chromatography indicates that it is the Type I enzyme which specifically associates with the middle-T/pp60c-src complex. This PtdIns kinase activity is separable from both middle T and pp60c-src. Type I PtdIns kinase also associates with pp60v-src immunoprecipitates from Rous-sarcoma-virus-transformed cells. Furthermore, this PtdIns kinase appears to co-precipitate with partially purified platelet derived growth factor (PDGF) receptor. The amount of this activity found in anti-phosphotyrosine immunoprecipitates or in wheat-germ-lectin-agarose precipitates is increased 50-fold by stimulation of quiescent Balb/C 3T3 fibroblasts with PDGF. These results suggest that the Type I PtdIns kinase is regulated by agents which affect cell growth and transformation, whereas the Type II PtdIns kinase may be regulated by the local [ATP]/[ADP] ratio.

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Selected References

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