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EC 1.14.13.122 Details
show Brenda entryEC number
1.14.13.122
Accepted name
chlorophyllide-a oxygenase
Reaction
chlorophyllide a + 2 O2 + 2 NADPH + 2 H+ = chlorophyllide b + 3 H2O + 2
NADP+ (overall reaction);;(1a) chlorophyllide a + O2 + NADPH + H+ = 71-hydroxychlorophyllide a + H2O + NADP+;;(1b) 71-hydroxychlorophyllide a + O2 + NADPH + H+ = chlorophyllide b + 2 H2O + NADP+
Other name(s)
chlorophyllide a oxygenase,
chlorophyll-b synthase,
CAO
Systematic name
chlorophyllide-a:oxygen 71-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 as EC 1.13.12.14, transferred 2011 to EC 1.14.13.122, modified 2011
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.6.4.1 created 1961, deleted 2002 1.6.4.2 created 1961, modified 1989, deleted 2002 1.6.4.3 created 1961, modified 1976, deleted 1983 1.6.4.4 created 1965, deleted 2002 1.6.4.5 created 1972, deleted 2002 1.6.4.6 created 1972, deleted 2002 1.6.4.7 created 1978, deleted 2002 1.6.4.8 created 1989, deleted 2002 1.6.4.9 created 1992, deleted 2002 1.6.4.10 created 1992, deleted 2002 1.14.13.45 created 1992, deleted 2003
