Reaction: luteothin + 2 O2 + 4 reduced ferredoxin [iron-sulfur] cluster + 4 H+ = aureothin + 3 H2O + 4 oxidized ferredoxin [iron-sulfur] cluster (overall reaction)
(1a) luteothin + O2 + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ = (7R)-7-hydroxyluteothin + H2O + 2 oxidized ferredoxin [iron-sulfur] cluster
(1b) (7R)-7-hydroxyluteothin + O2 + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ = aureothin + 2 H2O + 2 oxidized ferredoxin [iron-sulfur] cluster
For diagram of reaction click here.
Glossary: luteothin = 2-[(3E,5E)-3,5-dimethyl-6-(4-nitrophenyl)hexa-3,5-dien-1-yl]-6-methoxy-3,5-dimethyl-4H-pyran-4-one
aureothin = 2-methoxy-3,5-dimethyl-6-[(2R,4Z)-4-[(2E)-2-methyl-3-(4-nitrophenyl)prop-2-en-1-ylidene]oxolan-2-yl]-4H-pyran-4-one
spectinabilin = neoaureothin = 2-methoxy-3,5-dimethyl-6-[(2R,4Z)-4-[(2E,4E,6E)-2,4,6-trimethyl-7-(4-nitrophenyl)hepta-2,4,6-trien-1-ylidene]oxolan-2-yl]-4H-pyran-4-one
Other name(s): aurH (gene name)
Systematic name: luteothin,ferredoxin:oxygen oxidoreductase (aureothin-forming)
Comments: The enzyme, characterized from the bacterium Streptomyces thioluteus, is a bifunctional cytochrome P-450 (heme-thiolate) protein that catalyses both the hydroxylation of its substrate and formation of a furan ring, the final step in the biosynthesis of the antibiotic aureothin. In the bacteria Streptomyces orinoci and Streptomyces spectabilis an orthologous enzyme catalyses a similar reaction that forms spectinabilin.
Links to other databases: BRENDA, EXPASY, ExplorEnz, KEGG, MetaCyc, CAS registry number:
References:
1. He, J., Muller, M. and Hertweck, C. Formation of the aureothin tetrahydrofuran ring by a bifunctional cytochrome P450 monooxygenase. J. Am. Chem. Soc. 126 (2004) 16742-16743. [PMID: 15612710]
2. Traitcheva, N., Jenke-Kodama, H., He, J., Dittmann, E. and Hertweck, C. Non-colinear polyketide biosynthesis in the aureothin and neoaureothin pathways: an evolutionary perspective. Chembiochem 8 (2007) 1841-1849. [PMID: 17763486]