首页 | 本学科首页   官方微博 | 高级检索  
     


19F nuclear magnetic resonance observations of aldehyde dismutation catalyzed by horse liver alcohol dehydrogenase
Authors:D.C. Anderson  F.W. Dahlquist
Affiliation:Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403 U.S.A.
Abstract:We have examined aspects of the second catalytic activity of alcohol dehydrogenase from horse liver (LADH), which involves an apparent dismutation of an aldehyde substrate into alcohol and acid in the presence of LADH and NAD. Using the substrate p-trifluoromethylbenzaldehyde, we have observed various bound complexes by 19F NMR in an effort to further characterize the mechanism of the reaction. The mechanism appears to involve the catalytic activity of LADH · NAD · aldehyde complex which reacts to form an enzyme · NADH · acid complex. The affinity of the acid product for LADH · NADH is weak and the acid product readily desorbs from the ternary complex. The resulting LADH · NADH can then react with a second molecule of aldehyde to form NAD and the corresponding alcohol. The result is the conversion of two molecules of aldehyde to one each of acid and alcohol, with LADH and NAD acting catalytically. This sequence of reactions can also explain the slow formation of acid product observed when alcohol and NAD are incubated with the enzyme.
Keywords:Author to whom correspondence should be addressed.
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号