EC Explorer
[browse EC tree] - [search]
EC 1.14.13.93 Details
show Brenda entryEC number
1.14.13.93
Accepted name
(+)-abscisic acid 8′-hydroxylase
Reaction
(+)-abscisate + NADPH + H+ + O2 = 8′-hydroxyabscisate + NADP+ + H2O
Other name(s)
(+)-ABA 8′-hydroxylase,
ABA 8′-hydroxylase
Systematic name
abscisate,NADPH:oxygen oxidoreductase (8′-hydroxylating)
CAS registry number
153190-37-5
Comment
A heme-thiolate protein (P-450). Catalyses the first step in the oxidative degradation of abscisic acid and is considered to be the pivotal enzyme in controlling the rate of degradation of this plant hormone [1]. CO inhibits the reaction, but its effects can be reversed by the presence of blue light [1]. The 8′-hydroxyabscisate formed can be converted into (–)-phaseic acid, most probably spontaneously. Other enzymes involved in the abscisic-acid biosynthesis pathway are EC 1.1.1.288 (xanthoxin dehydrogenase), EC 1.2.3.14 (abscisic-aldehyde oxidase) and EC 1.13.11.51 (9-cis-epoxycarotenoid dioxygenase).
History
created 2005, deleted 2018
back to topEC Tree
1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.13.45 created 1992, deleted 2003
