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Information on EC 1.14.18.11 - plant 4alpha-monomethylsterol monooxygenase

for references in articles please use BRENDA:EC1.14.18.11
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IUBMB Comments
This plant enzyme catalyses a step in the biosynthesis of sterols. It acts on the methyl group of the 4alpha-methylated intermediates 24-ethylidenelophenol and 24-methylidenelophenol and catalyses three successive oxidations, turning it into a carboxyl group. The carboxylate is subsequently removed by EC 1.1.1.418, plant 3beta-hydroxysteroid-4alpha-carboxylate 3-dehydrogenase (decarboxylating). Unlike the fungal/animal enzyme EC 1.14.18.9, 4alpha-methylsterol monooxygenase, this enzyme is not able to act on 4,4-dimethylated substrates. That activity, which occurs earlier in the pathway, is performed in plants by a second enzyme, EC 1.14.18.10, plant 4,4-dimethylsterol C-4alpha-methyl-monooxygenase.
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The enzyme appears in viruses and cellular organisms
Synonyms
4alpha-methyl oxidase, 4alpha-methyl-DELTA7-sterol-4alpha-methyl-oxidase, 4alpha-methylsterol C4 oxidase, 4alpha-methylsterol-4alpha-methyl-oxidase, 4alpha-MSO, methylsterol monooxygenase 2, SMO2, SMO2-1, SMO2-2, sterol-4alpha-methyl oxidase 2, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
24-methylidenelophenol + 2 ferrocytochrome b5 + O2 + 2 H+ = 4alpha-(hydroxymethyl)ergosta-7,24(241)-dien-3beta-ol + 2 ferricytochrome b5 + H2O
show the reaction diagram
(1a)
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24-methylidenelophenol + 6 ferrocytochrome b5 + 3 O2 + 6 H+ = 3beta-hydroxyergosta-7,24(241)-dien-4alpha-carboxylate + 6 ferricytochrome b5 + 4 H2O
show the reaction diagram
overall reaction
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4alpha-(hydroxymethyl)ergosta-7,24(241)-dien-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 4alpha-formylergosta-7,24(241)-dien-3beta-ol + 2 ferricytochrome b5 + 2 H2O
show the reaction diagram
(1b)
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4alpha-formylergosta-7,24(241)-dien-3beta-ol + 2 ferrocytochrome b5 + O2 + 2 H+ = 3beta-hydroxyergosta-7,24(241)-dien-4alpha-carboxylate + 2 ferricytochrome b5 + H2O
show the reaction diagram
(1c)
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