MetaCyc Pathway: cholesterol degradation to androstenedione II (cholesterol dehydrogenase) in Variovorax sp. OAS795

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Reactions and Genes Tween 20 (C)
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3-beta-hydroxy-Delta(5)-steroid dehydrogenase:
cholesterol + NAD+→cholest-5-en-3-one + NADH + H+
(EC 1.1.1.145)
No genes
Steroid Delta-isomerase:
cholest-5-en-3-one→cholest-4-en-3-one
(EC 5.3.3.1)
No genes
cholest-4-en-3-one + dioxygen + 2 H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25S)-26-hydroxycholest-4-en-3-one + 2 an oxidized ferredoxin [iron-sulfur] cluster + H2O (EC 1.14.15.29)
No genes
cholest-4-en-3-one + dioxygen + 2 H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25R)-26-hydroxycholest-4-en-3-one + 2 an oxidized ferredoxin [iron-sulfur] cluster + H2O (EC 1.14.15.28)
No genes
(25S)-26-hydroxycholest-4-en-3-one + dioxygen + 2 H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25S)-26-oxocholest-4-en-3-one + 2 an oxidized ferredoxin [iron-sulfur] cluster + 2 H2O (EC 1.14.15.29)
No genes
(25R)-26-hydroxycholest-4-en-3-one + dioxygen + 2 H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25R)-26-oxocholest-4-en-3-one + 2 an oxidized ferredoxin [iron-sulfur] cluster + 2 H2O (EC 1.14.15.28)
No genes
(25S)-26-oxocholest-4-en-3-one + dioxygen + H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25S)-3-oxocholest-4-en-26-oate + 2 an oxidized ferredoxin [iron-sulfur] cluster + H2O (EC 1.14.15.29)
No genes
(25R)-26-oxocholest-4-en-3-one + dioxygen + H+ + 2 a reduced ferredoxin [iron-sulfur] cluster→(25R)-3-oxocholest-4-en-26-oate + 2 an oxidized ferredoxin [iron-sulfur] cluster + H2O (EC 1.14.15.28)
No genes
(25S)-3-oxocholest-4-en-26-oate + ATP + coenzyme A→(25S)-3-oxocholest-4-en-26-oyl-CoA + AMP + diphosphate (EC 6.2.1.42)
No genes
(25R)-3-oxocholest-4-en-26-oate + ATP + coenzyme A→(25R)-3-oxocholest-4-en-26-oyl-CoA + AMP + diphosphate (EC 6.2.1.42)
No genes
Alpha-methylacyl-CoA racemase (in reverse):
(25R)-3-oxocholest-4-en-26-oyl-CoA→(25S)-3-oxocholest-4-en-26-oyl-CoA
(EC 5.1.99.4)
ABID97_RS18500 -0.2
ABID97_RS28195 -0.0
(25S)-3-oxocholest-4-en-26-oyl-CoA + an oxidized electron carrier→3-oxocholest-4,24-dien-26-oyl-CoA + a reduced two electron carrier
No genes
3-oxocholest-4,24-dien-26-oyl-CoA + H2O→24-hydroxy-3-oxocholest-4-en-26-oyl-CoA
No genes
3-hydroxyacyl-CoA dehydrogenase:
24-hydroxy-3-oxocholest-4-en-26-oyl-CoA + NAD+→3,24-dioxocholest-4-en-26-oyl-CoA + NADH + H+
(EC 1.1.1.35)
ABID97_RS03030 +0.2
ABID97_RS05865 -1.4
ABID97_RS06010 -0.2
ABID97_RS08805 +0.3
ABID97_RS10560 -0.6
ABID97_RS15740 -0.5
ABID97_RS17005 -0.1
ABID97_RS18595 N.D.
Propanoyl-CoA C-acyltransferase (in reverse):
3,24-dioxocholest-4-en-26-oyl-CoA + coenzyme A→3-oxochol-4-en-24-oyl-CoA + propanoyl-CoA
(EC 2.3.1.176)
No genes
3-oxochol-4-en-24-oyl-CoA + an oxidized electron carrier→3-oxochol-4,22-dien-24-oyl-CoA + a reduced two electron carrier
No genes
3-oxochol-4,22-dien-24-oyl-CoA + H2O→22-hydroxy-3-oxochol-4-en-24-oyl-CoA
No genes
22-hydroxy-3-oxochol-4-en-24-oyl-CoA + NAD+→3,22-dioxochol-4-en-24-oyl-CoA + NADH + H+
No genes
Acetyl-CoA C-acyltransferase (in reverse):
3,22-dioxochol-4-en-24-oyl-CoA + coenzyme A→acetyl-CoA + 3-oxo-23,24-bisnorchol-4-en-22-oyl-CoA
(EC 2.3.1.16)
ABID97_RS04675 +0.1
ABID97_RS05875 N.D.
ABID97_RS06005 +0.0
ABID97_RS10975 +0.1
ABID97_RS11335 -0.2
ABID97_RS11380 -0.0
ABID97_RS12420 N.D.
ABID97_RS15750 -0.3
ABID97_RS18615 +0.1
ABID97_RS18775 +0.2
ABID97_RS20240 +0.0
ABID97_RS24190 +0.2
ABID97_RS25195 -0.4
ABID97_RS26575 N.D.
ABID97_RS27835 -0.6
ABID97_RS28230 +0.8
ABID97_RS28270 -0.4
ABID97_RS28430 -0.2
3-oxo-23,24-bisnorchol-4-en-22-oyl-CoA + an oxidized electron carrier→3-oxo-23,24-bisnorchol-4,17(20)-dien-22-oyl-CoA + a reduced two electron carrier
No genes
3-oxo-23,24-bisnorchol-4,17(20)-dien-22-oyl-CoA + H2O→17-hydroxy-3-oxo-4-pregnane-20-carboxyl-CoA
No genes
17-hydroxy-3-oxo-4-pregnane-20-carboxyl-CoA→propanoyl-CoA + androstenedione
No genes

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Candidate genes for each reaction are identified from best hits to MetaCyc; by matching EC numbers (which are assigned by TIGRFam, SEED, or best hits to KEGG); or by matching SEED roles to KEGG reactions to MetaCyc reactions. See the "Protein" tab of each gene for more information