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Information on EC 1.14.18.9 - 4alpha-methylsterol monooxygenase

for references in articles please use BRENDA:EC1.14.18.9
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IUBMB Comments
This enzyme is found in fungi and animals and catalyses a step in the biosynthesis of important sterol molecules such as ergosterol and cholesterol, respectively. The enzyme acts on the 4alpha-methyl group. Subsequent decarboxylation by EC 1.1.1.170, 3beta-hydroxysteroid-4alpha-carboxylate 3-dehydrogenase (decarboxylating), occurs concomitantly with epimerization of the remaining 4beta-methyl into the 4alpha position, thus making it a suitable substrate for a second round of catalysis. cf. EC 1.14.13.246, 4beta-methylsterol monooxygenase; EC 1.14.18.10, plant 4,4-dimethylsterol C-4alpha-methyl-monooxygenase; and EC 1.14.18.11, plant 4alpha-monomethylsterol monooxygenase.
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Synonyms
erg25, sc4mol, methyl sterol oxidase, erg25p, 4-methyl sterol oxidase, c-4 sterol methyl oxidase, c-4 methyl sterol oxidase, sterol c4 methyl oxidase, sterol-c4-methyl oxidase, 4,4-dimethyl-zymosterol 4alpha-methyl-oxidase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + 2 ferrocytochrome b5 + O2 + 2 H+ = 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + 2 ferricytochrome b5 + H2O
show the reaction diagram
(1c)
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4,4-dimethyl-5alpha-cholest-7-en-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 4beta-hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol + 2 ferricytochrome b5 + H2O
show the reaction diagram
(1a)
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4,4-dimethyl-5alpha-cholest-7-en-3beta-ol + 6 ferrocytochrome b5 + 3 O2 + 6 H+ = 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + 6 ferricytochrome b5 + 4 H2O
show the reaction diagram
4beta-hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + 2 ferricytochrome b5 + 2 H2O
show the reaction diagram
(1b)
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