Catalytic activity:L-arginine + n NADPH + n H (+) + m O (2) = citrulline + nitric oxide + n NADP (+) . ,cofactor:Binds 1 FAD. ,cofactor:Binds 1 FMN. ,cofactor:Heme group. ,cofactor:Tetrahydrobiopterin (BH4) . May stabilize the dimeric form of the enzyme. ,enzyme regulation:Stimulated by calcium/calmodulin. Inhibited by NOSIP and NOSTRIN. ,Function:Produces nitric oxide (NO) which is implicated in vascular smooth muscle relaxation through a cGMP-mediated signal transduction pathway. NO mediates vascular endothelial growth factor (VEGF) -induced angiogenesis in coronary vessels and promotes blood clotting through the activation of platelets. ,online information:Nitric oxide synthase entry ,polymorphism:Variation in NOS3 seem to be associated with susceptibility to coronary spasm. ,similarity:Belongs to the NOS family. ,similarity:Contains 1 FAD-binding FR-type domain. ,similarity:Contains 1 flavodoxin-like domain. ,subcellular location:Specifically associates with actin cytoskeleton in the G2 phase of the cell cycle; which is favored by interaction with NOSIP and results in a reduced enzymatic activity. ,subunit:Homodimer. Interacts with NOSIP and NOSTRIN. ,tissue specificity:Platelets , placenta , liver and kidney. ,
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