ExplorEnz: EC 1.4.3.22

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1.4.3.22

Accepted name:

diamine oxidase

Reaction:

histamine + H₂O + O₂ = (imidazol-4-yl)acetaldehyde + NH₃ + H₂O₂

Other name(s):

amine oxidase (ambiguous); amine oxidase (copper-containing) (ambiguous); CAO (ambiguous); Cu-containing amine oxidase (ambiguous); copper amine oxidase (ambiguous); diamine oxidase (ambiguous); diamino oxhydrase (ambiguous); histaminase; histamine deaminase (incorrect); semicarbazide-sensitive amine oxidase (incorrect); SSAO (incorrect)

Systematic name:

histamine:oxygen oxidoreductase (deaminating)

Comments:

A group of enzymes that oxidize diamines, such as histamine, and also some primary monoamines but have little or no activity towards secondary and tertiary amines. They are copper quinoproteins (2,4,5-trihydroxyphenylalanine quinone) and, like EC 1.4.3.21 (primary-amine oxidase) but unlike EC 1.4.3.4 (monoamine oxidase), they are sensitive to inhibition by carbonyl-group reagents, such as semicarbazide.

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB

References:

1.	Zeller, E.A. Diamine oxidases. In: Boyer, P.D., Lardy, H. and Myrbäck, K. (Ed.), The Enzymes, 2nd edn, vol. 8, Academic Press, New York, 1963, pp. 313–335.
2.	Crabbe, M.J., Waight, R.D., Bardsley, W.G., Barker, R.W., Kelly, I.D. and Knowles, P.F. Human placental diamine oxidase. Improved purification and characterization of a copper- and manganese-containing amine oxidase with novel substrate specificity. Biochem. J. 155 (1976) 679–687. [PMID: 182134]
3.	Chassande, O., Renard, S., Barbry, P. and Lazdunski, M. The human gene for diamine oxidase, an amiloride binding protein. Molecular cloning, sequencing, and characterization of the promoter. J. Biol. Chem. 269 (1994) 14484–14489. [PMID: 8182053]
4.	Houen, G. Mammalian Cu-containing amine oxidases (CAOs): new methods of analysis, structural relationships, and possible functions. APMIS Suppl. 96 (1999) 1–46. [PMID: 10668504]
5.	Elmore, B.O., Bollinger, J.A. and Dooley, D.M. Human kidney diamine oxidase: heterologous expression, purification, and characterization. J. Biol. Inorg. Chem. 7 (2002) 565–579. [DOI] [PMID: 12072962]

[EC 1.4.3.22 created 2007 (EC 1.4.3.6 created 1961, part-incorporated 2008)]