A quantitative structure-activity relationship study has been made on two different series of nitric oxide synthase
(NOS) inhibitors. A series of imidazoles and some mono or bicyclic nitrogen-containing heterocycles was reported
to potently act against neuronal NOS (nNOS) and a series of 2-aminopyridines to act against inducible NOS (iNOS). The
QSAR model derived for the former suggested that nNOS inhibition activity of the compounds is basically controlled by
electronic nature of the molecule and that the compounds having fused ring would have added advantage and the one derived
for the latter suggested that iNOS inhibition activity of 2-aminopyridines is controlled by hydrophobic nature of 6-
substituents and the steric nature of 4-substituents. A negative effect on activity in this series was however suggested to be
produced by the polarizability of the molecule.
Keywords: Nitric oxide synthase inhibitors, Imidazoles, 2-aminopyridines, QSAR study.
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