KEGG   ENZYME: 1.6.3.2Help
Entry
EC 1.6.3.2                  Enzyme                                 

Name
NAD(P)H oxidase (H2O-forming)
Class
Oxidoreductases;
Acting on NADH or NADPH;
With oxygen as acceptor
BRITE hierarchy
Sysname
NAD(P)H:oxygen oxidoreductase (H2O-forming)
Reaction(IUBMB)
2 NAD(P)H + 2 H+ + O2 = 2 NAD(P)+ + 2 H2O [RN:R10517 R10518]
Reaction(KEGG)
Substrate
NADH [CPD:C00004];
NADPH [CPD:C00005];
H+ [CPD:C00080];
O2 [CPD:C00007]
Product
NAD+ [CPD:C00003];
NADP+ [CPD:C00006];
H2O [CPD:C00001]
Comment
A flavoprotein (FAD). NADPH is a better substrate than NADH [1,3]. By removal of oxygen the enzyme is involved in aerobic tolerance in the thermophilic anaerobic archaeon Thermococcus profundus and in Giardia intestinalis, a microaerophilic single-celled parasite of the order Diplomonadida.
History
EC 1.6.3.2 created 2013
Reference
1  [PMID:8898901]
  Authors
Brown DM, Upcroft JA, Upcroft P
  Title
A H2O-producing NADH oxidase from the protozoan parasite Giardia duodenalis.
  Journal
Eur. J. Biochem. 241 (1996) 155-61.
Reference
2  [PMID:16359329]
  Authors
Li L, Wang CC
  Title
A likely molecular basis of the susceptibility of Giardia lamblia towards oxygen.
  Journal
Mol. Microbiol. 59 (2006) 202-11.
Reference
3  [PMID:18959761]
  Authors
Jia B, Park SC, Lee S, Pham BP, Yu R, Le TL, Han SW, Yang JK, Choi MS, Baumeister W, Cheong GW
  Title
Hexameric ring structure of a thermophilic archaeon NADH oxidase that produces predominantly H2O.
  Journal
FEBS. J. 275 (2008) 5355-66.
Reference
4  [PMID:20213313]
  Authors
Jia B, Lee S, Pham BP, Cho YS, Yang JK, Byeon HS, Kim JC, Cheong GW
  Title
An archaeal NADH oxidase causes damage to both proteins and nucleic acids under oxidative stress.
  Journal
Mol. Cells. 29 (2010) 363-71.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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