EC Explorer
[browse EC tree] - [search]
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
back to topEC Tree
1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.13.45 created 1992, deleted 2003
