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. 1996 Mar;7(3):435–442. doi: 10.1091/mbc.7.3.435

Physical association of the small GTPase Rho with a 68-kDa phosphatidylinositol 4-phosphate 5-kinase in Swiss 3T3 cells.

X D Ren 1, G M Bokoch 1, A Traynor-Kaplan 1, G H Jenkins 1, R A Anderson 1, M A Schwartz 1
PMCID: PMC275895  PMID: 8868471

Abstract

Our previous work showed that post-translationally modified Rho in its GTP-bound state stimulated phosphatidylinositol 4-phosphate 5-kinase (PIP5K) activity in mouse fibroblast lysates. To investigate whether Rho physically interacts with PIP5K, we incubated immobilized Rho-GST with Swiss 3T3 cell lysates and tested for retained PIP5K activity. Rho-GST, but not Ras-GST or GST alone, bound significant PIP5K activity. The binding of PIP5K was independent of whether Rho was in a GTP- or GDP-bound state. An antibody against a 68-kDa human erythrocyte type I PIP5K recognized a single 68-kDa protein eluted from Rho-GST column. The Rho-associated PIP5K responded to phosphatidic acid differentially from the erythrocyte type I PIP5K, suggesting that it could be a distinct isoform not reported previously. Rho co-immunoprecipitated with the 68-kDa PIP5K from Swiss 3T3 lysates, demonstrating that endogenous Rho also interacts with PIP5K. ADP-ribosylation of Rho with C3 exoenzyme enhanced PIP5K binding by approximately eightfold, consistent with the ADP-ribosylated Rho functioning as a dominant negative inhibitor. These results demonstrate that Rho physically interacts with a 68-kDa PIP5K, although whether the association is direct or indirect is unknown.

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Selected References

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