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EC 1.1.1.219 Details
EC number
1.1.1.219
Accepted name
dihydroflavonol 4-reductase
Reaction
a (2R,3S,4S)-leucoanthocyanidin + NADP+ = a (2R,3R)-dihydroflavonol + NADPH + H+
Other name(s)
dihydrokaempferol 4-reductase, dihydromyricetin reductase, NADPH-dihydromyricetin reductase, dihydroquercetin reductase, DFR (gene name), cis-3,4-leucopelargonidin:NADP+ 4-oxidoreductase, dihydroflavanol 4-reductase (incorrect)
Systematic name
(2R,3S,4S)-leucoanthocyanidin:NADP+ 4-oxidoreductase
CAS registry number
83682-99-9
Comment
This plant enzyme, involved in the biosynthesis of anthocyanidins, is known to act on (+)-dihydrokaempferol, (+)-taxifolin, and (+)-dihydromyricetin, although some enzymes may act only on a subset of these compounds. Each dihydroflavonol is reduced to the corresponding cis-flavan-3,4-diol. NAD+ can act instead of NADP+, but more slowly.
History
created 1989, modified 2016
EC Tree
1.1.1.68 created 1965, deleted 1978 [transferred to EC 1.1.99.15, deleted 1980]
1.1.1.70 created 1965, deleted 1978
1.1.1.74 created 1972, deleted 1976
1.1.1.89 created 1972, deleted 1976
1.1.1.109 created 1972, deleted 1976
1.1.1.139 created 1972, deleted 1978
1.1.1.155 created 1976, deleted 2004
1.1.1.171 created 1978, deleted 1984
1.1.1.180 created 1983, deleted 1984
1.1.1.182 created 1983, deleted 1990
1.1.1.204 created 1972 as EC 1.2.1.37, transferred 1984 to EC 1.1.1.204, modified 1989, deleted 2004
1.1.1.242 created 1992, deleted 2001
1.1.1.249 provisional version created 1999, deleted 1999 (reinstated 2001 as EC 2.5.1.46)
1.1.1.253 created 1999, deleted 2003