CATH Classification

Domain Context

CATH Clusters

Superfamily Nitric Oxide Synthase;Heme Domain;Chain A domain 2
Functional Family Nitric oxide synthase, inducible

Enzyme Information
Nitric-oxide synthase (NADPH).
based on mapping to UniProt P35228
2 L-arginine + 3 NADPH + 4 O(2) = 2 L-citrulline + 2 nitric oxide + 3 NADP(+) + 4 H(2)O.
-!- The enzyme consists of linked oxygenase and reductase domains. -!- The eukaryotic enzyme binds FAD, FMN, heme (iron protoporphyrin IX) and tetrahydrobiopterin, and its two domains are linked via a regulatory calmodulin-binding domain. -!- Upon calcium-induced calmodulin binding, the reductase and oxygenase domains form a complex, allowing electrons to flow from NADPH via FAD and FMN to the active center. -!- The reductase domain of the enzyme from the bacterium Sorangium cellulosum utilizes a [2Fe-2S] cluster to transfer the electrons from NADPH to the active center. -!- Cf. EC

UniProtKB Entries (1)

Homo sapiens
Nitric oxide synthase, inducible

PDB Structure

External Links
Organism Escherichia
Primary Citation
Structural characterization of nitric oxide synthase isoforms reveals striking active-site conservation.
Fischmann, T.O., Hruza, A., Niu, X.D., Fossetta, J.D., Lunn, C.A., Dolphin, E., Prongay, A.J., Reichert, P., Lundell, D.J., Narula, S.K., Weber, P.C.