Yeast (Saccharomyces cerevisiae) mitochondrial K^+ activated aldehyde dehydrogenase (ALDH) was purified and the effect of Li^+ and Me^(2+) was investigated. It was found that both 50 mM Li^+ and Mg^(2+) inhibited the dehydrogenase reaction of ALDH as ...
Yeast (Saccharomyces cerevisiae) mitochondrial K^+ activated aldehyde dehydrogenase (ALDH) was purified and the effect of Li^+ and Me^(2+) was investigated. It was found that both 50 mM Li^+ and Mg^(2+) inhibited the dehydrogenase reaction of ALDH as much as 50% and 76% respectively while the esterase reaction of this enzyme was stimulated 13% and 8%. This suggested that Li^+ and Me^(2+) stimulated deacylation of the intermediate thioester but inhibited the dissociation of Enzyme-NADH complex and the K^+ activation might be involved in the dissociation of Enzyme-NADH complex which seemed to be the rate limiting step in the ALDH catalyzed reaction.