Structure of Liver Alcohol Dehydrogenase at 2.9- angstrom Resolution
Abstract
The conformation of the polypeptide chain in horse liver alcohol dehydrogenase (EC 1.1.1.1), as well as the binding sites for some inhibitor molecules, have been determined from x-ray crystallographic data to a resolution of 2.9 Å. Each subunit of the dimeric molecule is organized into two parts unequal in size and separated by a wide and deep active-site cleft. The adenosine moiety of the coenzyme is bound within the smaller region. Interactions between these coenzyme-binding substructures define the subunit contact area of the molecule. The "catalytic" zinc atoms are bound at the bottom of the clefts about 20 Å from the surface of the molecule. The coenzyme binding region has a main-chain conformation very similar to a corresponding region in lactate and malate dehydrogenase. It is suggested that this substructure is a general one for binding of nucleotides and, in particular, the coenzyme NAD+.
- Publication:
-
Proceedings of the National Academy of Science
- Pub Date:
- August 1973
- DOI:
- 10.1073/pnas.70.8.2439
- Bibcode:
- 1973PNAS...70.2439B