IUBMB Enzyme Nomenclature


Accepted name: stearoyl-CoA 9-desaturase

Reaction: stearoyl-CoA + 2 ferrocytochrome b5 + O2 + 2 H+ = oleoyl-CoA + 2 ferricytochrome b5 + 2 H2O

Other name(s): δ9-desaturase; acyl-CoA desaturase; fatty acid desaturase; stearoyl-CoA, hydrogen-donor:oxygen oxidoreductase

Systematic name: stearoyl-CoA,ferrocytochrome-b5:oxygen oxidoreductase (9,10-dehydrogenating)

Comments: An iron protein. The rat liver enzyme is an enzyme system involving cytochrome b5 and EC, cytochrome-b5 reductase. The ferricytochrome b5 produced is reduced by NADH and cytochrome-b5 reductase (EC

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9014-34-0


1. Fulco, A.J. and Bloch, K. Cofactor requirements for the formation of δ9-unsaturated fatty acids in Mycobacterium phlei. J. Biol. Chem. 239 (1964) 993-997. [PMID: 14167617]

2. Oshino, N., Imai, Y. and Sato, R. Electron-transfer mechanism associated with fatty acid desaturation catalyzed by liver microsomes. Biochim. Biophys. Acta 128 (1966) 13-27. [PMID: 4382040]

3. Oshino, N., Imai, Y. and Sato, R. A function of cytochrome b5 in fatty acid desaturation by rat liver microsomes. J. Biochem. (Tokyo) 69 (1971) 155-167. [PMID: 5543646]

4. Strittmatter, P., Sputz, L., Corcoran, D., Rogers, M.J., Setlow, B. and Redline, R. Purification and properties of rat liver microsomal stearyl coenzyme A desaturase. Proc. Natl. Acad. Sci. USA 71 (1974) 4565-4569. [PMID: 4373719]

[EC created 1972 as EC, modified 1986, modified 2000, transferred 2000 to EC, modified 2003]

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