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EC 1.6.2.4 Details
EC number
1.6.2.4
Accepted name
NADPH—hemoprotein reductase
Reaction
NADPH + H+ + n oxidized hemoprotein = NADP+ + n reduced hemoprotein
Other name(s)
CPR, FAD-cytochrome c reductase, NADP-cytochrome c reductase, NADP-cytochrome reductase, NADPH-dependent cytochrome c reductase, NADPH:P-450 reductase, NADPH:ferrihemoprotein oxidoreductase, NADPH—cytochrome P-450 oxidoreductase, NADPH-cytochrome c oxidoreductase, NADPH-cytochrome c reductase, NADPH—cytochrome p-450 reductase, NADPH-ferricytochrome c oxidoreductase, NADPH-ferrihemoprotein reductase, TPNH2 cytochrome c reductase, TPNH-cytochrome c reductase, aldehyde reductase (NADPH-dependent), cytochrome P-450 reductase, cytochrome c reductase (reduced nicotinamide adenine dinucleotide phosphate, NADPH, NADPH-dependent), dihydroxynicotinamide adenine dinucleotide phosphate-cytochrome c reductase, ferrihemoprotein P-450 reductase, reduced nicotinamide adenine dinucleotide phosphate-cytochrome c reductase, reductase, cytochrome c (reduced nicotinamide adenine dinucleotide phosphate)
Systematic name
NADPH:hemoprotein oxidoreductase
CAS registry number
9023-03-4
Comment
A flavoprotein containing both FMN and FAD. This enzyme catalyses the transfer of electrons from NADPH, an obligatory two-electron donor, to microsomal P-450 monooxygenases (e.g. EC 1.14.14.1, unspecific monooxygenase) by stabilizing the one-electron reduced form of the flavin cofactors FAD and FMN. It also reduces cytochrome b5 and cytochrome c. The number n in the equation is 1 if the hemoprotein undergoes a 2-electron reduction, and is 2 if it undergoes a 1-electron reduction.
History
created 1972, modified 2003
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
1.6.2.1 created 1961, deleted 1965
1.6.2.3 created 1972, deleted 1965