title: Reconstitution of the isobutene-forming reaction catalyzed by cytochrome P450 and P450 reductase from Rhodotorula minuta: decarboxylation with the formation of isobutene.
abstract: An isobutene-forming activity was reconstituted with cytochrome P450rm and cytochrome P450 reductase purified from Rhodotorula minuta. The nonionic detergent. Emulgen 911, present in the preparation of purified P450rm, inhibited the reconstitution. Bovine serum albumin enhanced the activity of the reconstituted system. Branching of the beta carbon of the substrate carboxylic acid was important for formation of isobutene. In a comparative study with isovalerate and 3-deuterio-3-methylbutanoate, a very large isotopic effect (kH/kD = 14) was observed. This result indicates that formation of isobutene might be initiated by abstraction of hydrogen from the beta carbon of isovalerate and might be followed by decarboxylation.
authors.affiliation: Department of Applied Microbial Technology, Kumamoto Institute of Technology, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Fukuda
authors.forename: T
authors.initials: T
authors.lastname: Fujii
authors.forename: E
authors.initials: E
authors.lastname: Sukita
authors.forename: M
authors.initials: M
authors.lastname: Tazaki
authors.forename: S
authors.initials: S
authors.lastname: Nagahama
authors.forename: T
authors.initials: T
authors.lastname: Ogawa
mesh_terms: D000475:Alkenes / Q000378:metabolism*; D003577:Cytochrome P-450 Enzyme System / Q000302:isolation & purification / Q000378:metabolism*; D003903:Deuterium; D007700:Kinetics; D009251:NADPH-Ferrihemoprotein Reductase / Q000302:isolation & purification / Q000378:metabolism*; D012248:Rhodotorula / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D000475:Alkenes; D003577:Cytochrome P-450 Enzyme System; D003903:Deuterium; D009251:NADPH-Ferrihemoprotein Reductase; C008176:isobutylene