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- ArticleBostian KA, Betts GF.Biochem J. 1978 Sep 01;173(3):787-98.Data from steady-state kinetic analysis of yeast K+-activated aldehyde dehydrogenase are consistent with a ternary complex mechanism. Evidence from alternative substrate analysis and product-inhibition studies supports an ordered sequence of substrate binding in which NAD+ is the leading substrate. A preincubation requirement for NAD+ for maximum activity is also consistent with the importance of a binary enzyme-NAD+ complex. Dissociation constant for enzyme-NAD+ complex determined kinetically is in reasonable agreement with that determined by direct binding. The order of substrate addition proposed here differs from that proposed for a yeast aldehyde dehydrogenase previously reported. Different methods of purification produced an enzyme that showed similar kinetic characteristics to those reported here.