Abstract
1. 1. Aspergillus nidulans produces aldehyde dehydrogenase (ALD-DH) only when grown in the presence of ethanol, threonine or acetoacetic acid as inducer. Enzyme formation is inhibited by glucose in the growth medium. 2. 2. ALD-DH is purified by a rapid procedure using Cibacron Blue Affinity Chromatography with specific inhibitoe elution by NAD plus 2:2′ dithiodipyridine or 2:4 disulfiram. 3. 3. The pure native enzyme has a M r=265,000 and a subunit M r of 540,000. Its optimum pH is 8.5; its preferred substrate is acetaldehyde and it can use either NAD or NADP.
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