Neuronal nitric oxide synthase (nNOS)

Neuronal nitric oxide synthase (nNOS, NOS1) is a constitutively expressed enzyme predominantly found in neurons of the central and peripheral nervous system, as well as in other tissues such as skeletal muscle and epithelial cells. It catalyzes the production of nitric oxide (NO) from L-arginine, a process requiring cofactors such as calmodulin, heme, tetrahydrobiopterin, FAD, FMN, and NADPH. The enzymatic activity depends on dimerization and specific protein–protein interactions mediated by its PDZ domain. nNOS-derived NO is critical in long-term synaptic plasticity, neurogenesis, central cardiovascular regulation, and smooth muscle relaxations. Dysfunction or aberrant regulation of nNOS is implicated in multiple diseases, including neurodegeneration, cardiovascular pathology, and some psychiatric conditions. Clarification: The term "binding domain restoration" is atypical and seems to allude to therapeutic strategies aimed at restoring nNOS interactions—such as its PDZ domain-mediated localization or functional protein–protein interplay (e.g., with PSD-95, caveolin) rather than a recognized molecular entity or target. The correct target, in context, is "Neuronal nitric oxide synthase."

Other names

NOS1neuronal NOS

Inhibition of NO synthesis via competitive inhibition at the L-arginine binding site Interference with calmodulin binding Disruption of dimerization or heme binding