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EC 5.3.3.1 Details
EC number
5.3.3.1
Accepted name
steroid Δ-isomerase
Reaction
a 3-oxo-Δ5-steroid = a 3-oxo-Δ4-steroid
Other name(s)
hydroxysteroid isomerase, steroid isomerase, Δ5-ketosteroid isomerase, Δ5(or Δ4)-3-keto steroid isomerase, Δ5-steroid isomerase, 3-oxosteroid isomerase, Δ5-3-keto steroid isomerase, Δ5-3-oxosteroid isomerase
Systematic name
3-oxosteroid Δ5-Δ4-isomerase
CAS registry number
9031-36-1
Comment
This activity is catalysed by several distinct enzymes (cf. EC 1.1.3.6, cholesterol oxidase and EC 1.1.1.145, 3-hydroxy-5-steroid dehydrogenase).
History
created 1961
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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
1.18 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)
1.98.1. undefined
1.99 Other enzymes using O2 as oxidant (deleted subclass)
2 Transferases
3 Hydrolases
4 Lyases
5 Isomerases
5.1 Racemases and epimerases
5.2 cis-trans-Isomerases
5.3 Intramolecular oxidoreductases
5.3.1 Interconverting aldoses and ketoses, and related compounds
5.3.2 Interconverting keto- and enol-groups
5.3.3 Transposing C=C bonds
5.3.3.1 steroid Δ-isomerase
5.3.3.2 isopentenyl-diphosphate Δ-isomerase
5.3.3.3 vinylacetyl-CoA Δ-isomerase
5.3.3.4 muconolactone Δ-isomerase
5.3.3.5 cholestenol Δ-isomerase
5.3.3.6 methylitaconate Δ-isomerase
5.3.3.7 aconitate Δ-isomerase
5.3.3.8 Δ3-Δ2-enoyl-CoA isomerase
5.3.3.9 prostaglandin-A1 Δ-isomerase
5.3.3.10 5-carboxymethyl-2-hydroxymuconate Δ-isomerase
5.3.3.11 isopiperitenone Δ-isomerase
5.3.3.12 L-dopachrome isomerase
5.3.3.13 polyenoic fatty acid isomerase
5.3.3.14 trans-2-decenoyl-[acyl-carrier protein] isomerase
5.3.3.15 ascopyrone tautomerase
5.3.3.16 4-oxalomesaconate tautomerase
5.3.3.17 trans-2,3-dihydro-3-hydroxyanthranilate isomerase
5.3.3.18 2-(1,2-epoxy-1,2-dihydrophenyl)acetyl-CoA isomerase
5.3.3.19 3-[(4R)-4-hydroxycyclohexa-1,5-dien-1-yl]-2-oxopropanoate isomerase
5.3.3.20 2-hydroxyisobutanoyl-CoA mutase
5.3.3.21 Δ3,5-Δ2,4-dienoyl-CoA isomerase
5.3.3.22 lutein isomerase
5.3.3.23 S-methyl-5-thioribulose 1-phosphate isomerase
5.3.4 Transposing S-S bonds
5.3.99 Other intramolecular oxidoreductases
5.4 Intramolecular transferases
5.5 Intramolecular lyases
5.6 Isomerases altering macromolecular conformation
5.99 Other isomerases
6 Ligases
7 Translocases