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EC 1.6.2.2 Details

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EC number

1.6.2.2

Accepted name

cytochrome-b₅ reductase

Reaction

NADH + 2 ferricytochrome b₅ = NAD⁺ + H⁺ + 2 ferrocytochrome b₅

Other name(s)

cytochrome b₅ reductase, dihydronicotinamide adenine dinucleotide-cytochrome b₅ reductase, reduced nicotinamide adeninedinucleotide-cytochrome b₅ reductase, NADH-ferricytochrome b₅ oxidoreductase, NADH-cytochrome b₅ reductase, NADH 5α-reductase , NADH-cytochrome-b₅ reductase

Systematic name

NADH:ferricytochrome-b₅ oxidoreductase

CAS registry number

9032-25-1

Comment

A flavoprotein (FAD).

History

created 1961

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.6 Acting on NADH or NADPH

1.6.1 With NAD⁺ or NADP⁺ as acceptor

1.6.2 With a heme protein as acceptor

1.6.2.1 created 1961, deleted 1965

1.6.2.2 cytochrome-b₅ reductase

1.6.2.3 created 1972, deleted 1965

1.6.2.4 NADPH—hemoprotein reductase

1.6.2.5 NADPH—cytochrome-c₂ reductase

1.6.2.6 leghemoglobin reductase

1.6.3 With oxygen as acceptor

1.6.4 With a disulfide as acceptor (deleted sub-subclass)

1.6.5 With a quinone or similar compound as acceptor

1.6.6 With a nitrogenous group as acceptor

1.6.7 With an iron-sulfur protein as acceptor (deleted sub-subclass)

1.6.8 With a flavin as acceptor (deleted sub-subclass)

1.6.99 With unknown physiological acceptors

1.7 Acting on other nitrogenous compounds as donors

1.7.1 With NAD⁺ or NADP⁺ as acceptor

1.7.2 With a cytochrome as acceptor

1.7.3 With oxygen as acceptor

1.7.5 With a quinone or similar compound as acceptor

1.7.6 With a nitrogenous group as acceptor

1.7.7 With an iron-sulfur protein as acceptor

1.7.9 With a copper protein as acceptor

1.7.99 With unknown physiological acceptors

1.7.99.1 hydroxylamine reductase

1.7.99.2 created 1961, modified 1976, deleted 1992

1.7.99.3 created 1961 as EC 1.6.6.5, transferred 1964 to EC 1.7.99.3, modified 1976, deleted 2002

1.7.99.4 nitrate reductase

1.7.99.5 created 1965 as EC 1.1.1.68, transferred 1978 to EC 1.1.99.15, transferred 1980 to EC 1.7.99.5, deleted 2005

1.7.99.6 nitrous-oxide reductase

1.7.99.7 nitric-oxide reductase

1.7.99.8 hydrazine oxidoreductase

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.12 Acting on hydrogen as donor

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

3.1 Acting on ester bonds

3.2 Glycosylases

3.3 Acting on ether bonds

3.4 Acting on peptide bonds (peptidases)

3.5 Acting on carbon-nitrogen bonds, other than peptide bonds

3.6 Acting on acid anhydrides

3.7 Acting on carbon-carbon bonds

3.8 Acting on halide bonds

3.9 Acting on phosphorus-nitrogen bonds

3.10 Acting on sulfur-nitrogen bonds

3.11 Acting on carbon-phosphorus bonds

3.12 Acting on sulfur-sulfur bonds

3.13 Acting on carbon-sulfur bonds

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Release 2023.1 (January 2023)