Structures of horse liver alcohol dehydrogenase complexed with NAD+ and substituted benzyl alcohols.Ramaswamy, S., Eklund, H., Plapp, B.V.
(1994) Biochemistry 33: 5230-5237
- PubMed: 8172897
- DOI: 10.1021/bi00183a028
- Primary Citation of Related Structures:
- PubMed Abstract:
- Binding of Substrate in a Ternary Complex of Horse Liver Alcohol Dehydrogenase
Eklund, H., Plapp, B.V., Samama, J.-P., Branden, C.-I.
(1982) J Biol Chem 257: 14359
- Structure of a Triclinic Ternary Complex of Horse Liver Alcohol Dehydrogenase at 2.9 Angstroms Resolution
Eklund, H., Samama, J.-P., Wallen, L., Branden, C.-I., Akeson, A., Jones, T.A.
(1981) J Mol Biol 146: 561
- Three-Dimensional Structure of Horse Liver Alcohol Dehydrogenase at 2.4 Angstroms Resolution
Eklund, H., Nordstrom, B., Zeppezauer, E., Soderlund, G., Ohlsson, I., Boiwe, T., Soderberg, B.-O., Tapia, O., Branden, C.-I., Akeson, A.
(1976) J Mol Biol 102: 27
Structures of the enzyme complexed with NAD+ and 2,3,4,5,6-pentafluorobenzyl alcohol were determined by X-ray crystallography at a resolution of 2.1 A and to a refinement R value of 18.3% for a monoclinic (P2(1)) form and to 2.4 A and an R value of 18.9% for a triclinic crystal form ...
Structures of the enzyme complexed with NAD+ and 2,3,4,5,6-pentafluorobenzyl alcohol were determined by X-ray crystallography at a resolution of 2.1 A and to a refinement R value of 18.3% for a monoclinic (P2(1)) form and to 2.4 A and an R value of 18.9% for a triclinic crystal form. The pentafluorobenzyl alcohol does not react, due to electron withdrawal by the fluorine atoms. A structure with NAD+ and p-bromobenzyl alcohol in the monoclinic form was also determined at 2.5 A and an R value of 16.7%. The conformations of the subunits in the monoclinic and triclinic crystal forms are very similar. The dimer is the asymmetric unit, and a rigid body rotation closes the cleft between the coenzyme and catalytic domains upon complex formation. In the monoclinic form, this conformational change is described by a rotation of 9 degrees in one subunit and 10 degrees in the other. The pentafluoro- and p-bromobenzyl alcohols bind in overlapping positions. The hydroxyl group of each alcohol is ligated to the catalytic zinc and participates in an extensive hydrogen-bonded network that includes the imidazole group of His-51, which can act as a base and shuttle a proton to solvent. The hydroxymethyl carbon of the pentafluorobenzyl alcohol is 3.4 A from C4 of the nicotinamide ring, and the pro-R hydrogen is in a good position for direct transfer to C4. The p-bromobenzyl alcohol may react after small rotations around single bonds of the alcohol. These structures should approximate the active Michaelis-Menten complexes.
Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala.