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Institute for Physiological Chemistry and Pathobiochemistry, Johannes Gutenberg-University, D-55099 Mainz, Germany;
* Institute for Biochemistry II, University of Frankfurt Hospital, Frankfurt, Germany;
Institute for Anatomy and Cell Biology, Justus-Liebig-University, D-35385 Giessen, Germany; and
§ Aventis, Disease Group Cardiovascular Agents, D-65926 Frankfurt, Germany
1Correspondence: Institute for Biochemistry II, University of Frankfurt Hospital, Theodor-Stern-Kai 7, D-60590 Frankfurt, Germany. E-mail: wme{at}biochem2.de
Production of nitric oxide (NO) in endothelial cells is regulated by direct interactions of endothelial nitric oxide synthase (eNOS) with effector proteins such as Ca2+-calmodulin, by posttranslational modifications such as phosphorylation via protein kinase B, and by translocation of the enzyme from the plasma membrane caveolae to intracellular compartments. Reversible acylation of eNOS is thought to contribute to the intracellular trafficking of the enzyme; however, protein factor(s) that govern the translocation of the enzyme are still unknown. Here we have used the yeast two-hybrid system and identified a novel 34 kDa protein, termed NOSIP (eNOS interacting protein), which avidly binds to the carboxyl-terminal region of the eNOS oxygenase domain. Coimmunoprecipitation studies demonstrated the specific interaction of eNOS and NOSIP in vitro and in vivo, and complex formation was inhibited by a synthetic peptide of the caveolin-1 scaffolding domain. NO production was significantly reduced in eNOS-expressing CHO cells (CHO-eNOS) that transiently overexpressed NOSIP. Stimulation with the calcium ionophore A23187 induced the reversible translocation of eNOS from the detergent-insoluble to the detergent-soluble fractions of CHO-eNOS, and this translocation was completely prevented by transient coexpression of NOSIP in CHO-eNOS. Immunofluorescence studies revealed a prominent plasma membrane staining for eNOS in CHO-eNOS that was abolished in the presence of NOSIP. Subcellular fractionation studies identified eNOS in the caveolin-rich membrane fractions of CHO-eNOS, and coexpression of NOSIP caused a shift of eNOS to intracellular compartments. We conclude that NOSIP is a novel type of modulator that promotes translocation of eNOS from the plasma membrane to intracellular sites, thereby uncoupling eNOS from plasma membrane caveolae and inhibiting NO synthesis.—Dedio, J., König, P., Wohlfart, P., Schroeder, C., Kummer, W., Müller-Esterl, W. NOSIP, a novel modulator of endothelial nitric oxide synthase activity.
Key Words: eNOS • yeast two-hybrid system • protein–protein interaction • subcellular trafficking
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