ID   1.14.15.20
DE   heme oxygenase (biliverdin-producing, ferredoxin).
CA   8 H(+) + heme b + 3 O2 + 6 reduced [2Fe-2S]-[ferredoxin] = biliverdin
CA   IXalpha + CO + Fe(2+) + 3 H2O + 6 oxidized [2Fe-2S]-[ferredoxin].
CC   -!- The enzyme, found in plants, algae, and cyanobacteria, participates
CC       in the biosynthesis of phytochromobilin and phytobilins.
CC   -!- The terminal oxygen atoms that are incorporated into the carbonyl
CC       groups of pyrrole rings A and B of biliverdin are derived from two
CC       separate oxygen molecules.
CC   -!- The third oxygen molecule provides the oxygen atom that converts the
CC       alpha-carbon to CO.
CC   -!- Unlike this enzyme, which uses ferredoxin as its electron donor,
CC       the electron source for the related mammalian enzyme (EC 1.14.14.18)
CC       is EC 1.6.2.4.
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