Substrate Specificity and Kinetic Properties of NADP+—Dependent Alcohol Dehydrogenase ofPhycomyces Blakesleeanus
作者:
HartzT. K.,
HoustonM. R.,
LockwoodL. B.,
期刊:
Mycologia
(Taylor Available online 1978)
卷期:
Volume 70,
issue 3
页码: 586-593
ISSN:0027-5514
年代: 1978
DOI:10.1080/00275514.1978.12020262
出版商: Taylor&Francis
数据来源: Taylor
摘要:
SUMMARYNADP+-dependent alcohol dehydrogenase (alcohol: NADP+: oxidoreductase, EC 1.1.1.2) was isolated from cell-free extracts ofPhycomyces blakesleeanus, and the substrate specificity and kinetic properties of the enzyme were studied. Only primary alcohols were oxidized and of the aldehydes tested, only methanal (formaldehyde) was utilized as a substrate. The enzyme was inactive with NAD+and was inhibited by pyrazole and by p-chloromercuribenzoate.The apparent Kmvalues atpH 8.3 decreased with increasing chain length of the alcohol substrate. Ethanol had the highest value (1.98×10-5M) while the value for 1-heptanol was 2.46×10-6M. The maximum velocities (Vmax) decreased as the chain length of the alcohols was increased. The Kmvalue for NADP+was 1.3×10-5M.
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