Nitric oxide synthase 2 (inducible)

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PDB 1nsi EBI.jpg
Available structures
PDBOrtholog search: PDBe RCSB
AliasesNOS2, HEP-NOS, INOS, NOS, NOS2A, Nitric oxide synthase 2
External IDsOMIM: 163730 MGI: 97361 HomoloGene: 55473 GeneCards: NOS2
Gene location (Human)
Chromosome 17 (human)
Chr.Chromosome 17 (human)[1]
Chromosome 17 (human)
Genomic location for NOS2
Genomic location for NOS2
Band17q11.2Start27,756,766 bp[1]
End27,800,529 bp[1]
RNA expression pattern
PBB GE NOS2A 210037 s at fs.png
More reference expression data
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 17: 27.76 – 27.8 MbChr 11: 78.92 – 78.96 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Nitric oxide synthase, inducible is an enzyme that in humans is encoded by the NOS2 gene.[5]

Nitric oxide is a reactive free radical which acts as a biologic mediator in several processes, including neurotransmission and antimicrobial and antitumoral activities. This gene encodes a nitric oxide synthase which is expressed in the liver and is inducible by a combination of lipopolysaccharide and certain cytokines. Three related pseudogenes are located within the Smith-Magenis syndrome region on chromosome 17. Alternative splicing of this gene results in two transcript variants encoding different isoforms.[6]


Nitric oxide synthase 2A has been shown to interact with Caveolin 1[7] and Rac2.[8]


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000007171 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000020826 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Geller DA, Lowenstein CJ, Shapiro RA, Nussler AK, Di Silvio M, Wang SC, Nakayama DK, Simmons RL, Snyder SH, Billiar TR (May 1993). "Molecular cloning and expression of inducible nitric oxide synthase from human hepatocytes". Proc Natl Acad Sci USA. 90 (8): 3491–5. doi:10.1073/pnas.90.8.3491. PMC 46326. PMID 7682706.
  6. ^ "Entrez Gene: NOS2A nitric oxide synthase 2A (inducible, hepatocytes)".
  7. ^ Felley-Bosco E, Bender FC, Courjault-Gautier F, Bron C, Quest AF (December 2000). "Caveolin-1 down-regulates inducible nitric oxide synthase via the proteasome pathway in human colon carcinoma cells". Proc. Natl. Acad. Sci. U.S.A. 97 (26): 14334–9. doi:10.1073/pnas.250406797. PMC 18919. PMID 11114180.
  8. ^ Kuncewicz T, Balakrishnan P, Snuggs MB, Kone BC (August 2001). "Specific association of nitric oxide synthase-2 with Rac isoforms in activated murine macrophages". Am. J. Physiol. Renal Physiol. 281 (2): F326–36. PMID 11457725.