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EC 1.13.12.14 Details
EC number
1.13.12.14
Accepted name
chlorophyllide-a oxygenase
Reaction
(1) chlorophyllide a + O2 + NADPH + H+ = 7-hydroxychlorophyllide a + H2O + NADP+;;(2) 7-hydroxychlorophyllide a + O2 + NADPH + H+ = chlorophyllide b + 2 H2O + NADP+
Other name(s)
chlorophyllide a oxygenase,
cholorophyll-b synthase,
CAO
Systematic name
chlorophyllide-a:oxygen 7-oxidoreductase
CAS registry number
216503-73-0
Comment
Chlorophyll b is required for the assembly of stable light-harvesting complexes (LHCs) in the chloroplast of green algae, cyanobacteria and plants [2,3]. Contains a mononuclear iron centre [3]. The enzyme catalyses two successive hydroxylations at the 7-methyl group of chlorophyllide a. The second step yields the aldehyde hydrate, which loses H2O spontaneously to form chlorophyllide b [2]. Chlorophyll a and protochlorophyllide a are not substrates [2].
History
created 2006, deleted 2011
EC Tree
1.13.12.10 created 1989, modified 1999, deleted 2001