Biology:Methylsterol monooxygenase
From HandWiki
Short description: Class of enzymes
| Methylsterol monooxygenase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.14.13.72 | ||||||||
| CAS number | 37256-80-7 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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Methylsterol monooxygenase (EC 1.14.13.72, methylsterol hydroxylase, 4-methylsterol oxidase, 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol,hydrogen-donor:oxygen oxidoreductase (hydroxylating)) is an enzyme with systematic name 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol,NAD(P)H:oxygen oxidoreductase (hydroxylating).[1][2][3][4][5][6][7] This enzyme catalyses the following chemical reaction
- 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol + 3 NAD(P)H + 3 H+ + 3 O2 [math]\displaystyle{ \rightleftharpoons }[/math] 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + 3 NAD(P)+ + 4 H2O (overall reaction)
- (1a) 4,4-dimethyl-5alpha-cholest-7-en-3beta-ol + NAD(P)H + H+ + O2 [math]\displaystyle{ \rightleftharpoons }[/math] 4beta-hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol + NAD(P)+ + H2O
- (1b) 4beta-hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol + NAD(P)H + H+ + O2 [math]\displaystyle{ \rightleftharpoons }[/math] 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + NAD(P)+ + 2 H2O
- (1c) 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carbaldehyde + NAD(P)H + H+ + O2 [math]\displaystyle{ \rightleftharpoons }[/math] 3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate + NAD(P)+ + H2O
Methylsterol monooxygenase requires cytochrome b5.
References
- ↑ "The role of cytochrome b5 in 4alpha-methyl-oxidation and C5(6) desaturation of plant sterol precursors". Biochemical and Biophysical Research Communications 236 (2): 434–7. July 1997. doi:10.1006/bbrc.1997.6974. PMID 9240456.
- ↑ "Plant sterol biosynthesis. Identification and characterization of two distinct microsomal oxidative enzymatic systems involved in sterol C4-demethylation". The Journal of Biological Chemistry 268 (16): 11639–54. June 1993. PMID 8505296.
- ↑ "Affinity chromatography of microsomal enzymes on immobilized detergent-solubilized cytochrome b5". The Journal of Biological Chemistry 261 (8): 3790–9. March 1986. PMID 3949790.
- ↑ "Total enzymic synthesis of cholesterol from lanosterol. Cytochrome b5-dependence of 4-methyl sterol oxidase". The Journal of Biological Chemistry 256 (10): 4822–6. May 1981. PMID 7228857.
- ↑ "Mixed function oxidases in sterol metabolism. Source of reducing equivalents". The Journal of Biological Chemistry 255 (22): 10624–9. November 1980. PMID 7430141.
- ↑ "Investigation of the component reactions of oxidative sterol demethylation. Evidence against participation of cytochrome P-450". The Journal of Biological Chemistry 243 (19): 4966–72. October 1968. PMID 4234469.
- ↑ "Investigation of the component reactions of oxidative sterol demethylation. Study of the aerobic and anaerobic processes". Biochemistry 6 (9): 2673–8. September 1967. doi:10.1021/bi00861a005. PMID 4383278.
External links
- Methylsterol+monooxygenase at the US National Library of Medicine Medical Subject Headings (MeSH)
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