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EC 1.10.3.11 Details
EC number
1.10.3.11
Accepted name
ubiquinol oxidase (non-electrogenic)
Reaction
2 ubiquinol + O2 = 2 ubiquinone + 2 H2O
Other name(s)
plant alternative oxidase, cyanide-insensitive oxidase, AOX (gene name), ubiquinol oxidase, ubiquinol:O2 oxidoreductase (non-electrogenic)
Systematic name
ubiquinol:oxygen oxidoreductase (non-electrogenic)
Comment
The enzyme, described from the mitochondria of plants and some fungi and protists, is an alternative terminal oxidase that is not sensitive to cyanide inhibition and does not generate a proton motive force. Unlike the electrogenic terminal oxidases that contain hemes (cf. EC 1.10.3.10 and EC 1.10.3.14), this enzyme contains a dinuclear non-heme iron complex. The function of this oxidase is believed to be dissipating excess reducing power, minimizing oxidative stress, and optimizing photosynthesis in response to changing conditions.
History
created 2011, modified 2014
EC Tree
1.14.99.5 created 1972, modified 1986, modified 2000, deleted 2000
1.14.99.6 created 1972, modified 2000, deleted 2000
1.14.99.8 created 1972, deleted 1984
1.14.99.13 created 1972, deleted 1984
1.14.99.16 created 1972, deleted 2002
1.14.99.17 created 1972, deleted 1976
1.14.99.18 created 1976, modified 1999, deleted 2003
1.14.99.25 created 1986, deleted 2000