CAO, CAO1, Cao2, chlorophyll a oxygenase, chlorophyll a oxygenase/chlorophyll b synthase, chlorophyllide a oxygenase, chlorophyllide a oxygenase 1, fch2, OsCAO1, PGL
EC Number
1.14.13.122
CAS Registry Number
Comments
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].
Cofactor
Fe cation
History
Reactions
Chlorophyllide a + 2 O(2) + 2 Nadph = chlorophyllide b + 3 H(2)O + 2 NADP(+).
