The inhibition of the constitutive bovine endothelial nitric oxide synthase by imidazole and indazole agents

Archives of Biochemistry and Biophysics
D J WolffS Umansky

Abstract

Citrulline formation by the Ca2+ CaM-dependent nitric oxide synthase of bovine endothelium is inhibited reversibly by 7-nitroindazole, 1-phenylimidazole, and imidazole. As measured at 0.67 microM (6R)-5,6,7,8-tetrahydrobiopterin (BH4), IC50 values of 0.8, 200, and 50 microM were determined for 7-nitroindazole, 1-phenylimidazole, and imidazole, respectively. Increasing concentrations of added BH4 cofactor increased the IC50 values for 7-nitroindazole and 1-phenylimidazole but did not alter the IC50 value for imidazole. 7-nitroindazole inhibited citrulline formation by the endothelial cNOS noncompetitively versus arginine substrate but competitively versus BH4 with a Ki value of 0.8 microM. 1-Phenylimidazole inhibited citrulline formation by the endothelial cNOS competitively versus both arginine substrate and BH4 with a Ki value of 50 microM. Imidazole inhibited citrulline formation competitively versus arginine substrate but noncompetitively versus BH4 with a Ki value of 50 microM. Neither 7-nitroindazole, 1-phenylimidazole, nor imidazole inhibited the cytochrome c reductase activity of endothelial cNOS at concentrations up to 5000-fold higher than their Ki values for inhibition of citrulline formation. By comparison with the p...Continue Reading

Citations

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