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EC 1.17.3.4 Details

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EC number

1.17.3.4

Accepted name

juglone 3-hydroxylase

Reaction

2 juglone + O₂ = 2 3,5-dihydroxy-1,4-naphthoquinone (overall reaction);;(1a) 2 juglone + 2 H₂O = 2 naphthalene-1,2,4,8-tetrol;;(1b) 2 naphthalene-1,2,4,8-tetrol + O₂ = 2 3,5-dihydroxy-1,4-naphthoquinone + 2 H₂O

Other name(s)

juglone hydroxylase, naphthoquinone hydroxylase, naphthoquinone-hydroxylase

Systematic name

5-hydroxy-1,4-naphthoquinone,water:oxygen oxidoreductase (3-hydroxylating)

CAS registry number

98865-54-4

Comment

Even though oxygen is consumed, molecular oxygen is not incorporated into the product. Catalysis starts by incorporation of an oxygen atom from a water molecule into the substrate. The naphthalene-1,2,4,8-tetrol intermediate is then oxidized by molecular oxygen, which is reduced to water. Also acts on 1,4-naphthoquinone, naphthazarin and 2-chloro-1,4-naphthoquinone.

History

created 1989 as EC 1.14.99.27, transferred 2016 to EC 1.17.3.4

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

1.6.3 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

1.8 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

1.17.1 With NAD⁺ or NADP⁺ as acceptor

1.17.2 With a cytochrome as acceptor

1.17.3 With oxygen as acceptor

1.17.3.1 pteridine oxidase

1.17.3.2 xanthine oxidase

1.17.3.3 6-hydroxynicotinate dehydrogenase

1.17.3.4 juglone 3-hydroxylase

1.17.4 With a disulfide as acceptor

1.17.4.1 ribonucleoside-diphosphate reductase

1.17.4.2 ribonucleoside-triphosphate reductase (thioredoxin)

1.17.4.3 4-hydroxy-3-methylbut-2-en-1-yl diphosphate synthase

1.17.4.4 vitamin-K-epoxide reductase (warfarin-sensitive)

1.17.4.5 vitamin-K-epoxide reductase (warfarin-insensitive)

1.17.5 With a quinone or similar compound as acceptor

1.17.7 With an iron-sulfur protein as acceptor

1.17.8 With a flavin as acceptor

1.17.9 With a copper protein as acceptor

1.17.98 With other, known, physiological acceptors

1.17.99 With unknown physiological acceptors

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

1.20.1 With NAD⁺ or NADP⁺ as acceptor

1.20.2 With a cytochrome as acceptor

1.20.4 With disulfide as acceptor

1.20.9 With a copper protein as acceptor

1.20.98 With other, known, physiological acceptors

1.20.99 With unknown physiological acceptors

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

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)