Purification and properties of a carbonyl reductase involved in stereoselective reduction of ethyl 4-chloro-3-oxobutanoate from Cylindrocarpon sclerotigenum IFO 31855.
A NADPH-dependent carbonyl reductase (CSCR1) was purified to homogeneity from Cylindrocarpon sclerotigenum IFO 31855. The enzyme catalyzed the stereoselective reduction of ethyl 4-chloro-3-oxobutanoate to the corresponding (S)-alcohol with a >99% enantiomer excess. The relative molecular mass of the enzyme was estimated to be 68,000 by gel filtration chromatography and 24,800 on SDS polyacrylamide gel electrophoresis. The enzyme had an extremely narrow substrate specificity and it highly reduced conjugated diketone, 2,3-butanedion, in addition to ethyl 4-chloro-3-oxobutanoate. The enzyme activity was inhibited by HgCl(2) (100%), 5,5'-dithiobis(2-nitrobenzoic acid) (56%), dicoumarol (42%), and CuSO(4) (46%). The N-terminal amino acid sequence of the enzyme (P-Q-G-I-P-T-A-S-R-L) showed no apparent similarity with those of other oxidoreductases.
Saratani
Yuri
Y
Research Institute for Advanced Science and Technology, Osaka Prefecture University, 1-2 Gakuen-cho, Sakai, Osaka 599-8570, Japan.
Uheda
Eiji
E
Yamamoto
Hiroaki
H
Nishimura
Atsuo
A
Yoshizako
Fumiki
F
D000090:Acetoacetates / Q000378:metabolism*; D000429:Alcohol Oxidoreductases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000438:Alcohols; D000449:Aldehyde Reductase; D000074408:Aldo-Keto Reductases; D003931:Diacetyl / Q000378:metabolism; D004791:Enzyme Inhibitors; D006865:Hydrogenation; D003904:Mitosporic Fungi / Q000201:enzymology*; D008970:Molecular Weight; D013237:Stereoisomerism; D013379:Substrate Specificity
D000090:Acetoacetates; D000438:Alcohols; D004791:Enzyme Inhibitors; C111982:ethyl 4-chloro-3-oxobutanoate; D000429:Alcohol Oxidoreductases; D000074408:Aldo-Keto Reductases; D000449:Aldehyde Reductase; D003931:Diacetyl