A link between protein structure and enzyme catalyzed hydrogen tunneling.Bahnson, B.J., Colby, T.D., Chin, J.K., Goldstein, B.M., Klinman, J.P.
(1997) Proc.Natl.Acad.Sci.USA 94: 12797-12802
- PubMed: 9371755
- Primary Citation of Related Structures:
- PubMed Abstract:
- Interdomain Motion in Liver Alcohol Dehydrogenase. Structural and Energetic Analysis of the Hinge Bending Mode
Colonna-Cesari, F.,Perahia, D.,Karplus, M.,Eklund, H.,Branden, C.I.,Tapia, O.
(1986) J.Biol.Chem. 261: 15273
- Three-Dimensional Structure of Horse Liver Alcohol Dehydrogenase at 2.4 A 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
- Three-Dimensional Structure of Isonicotinimidylated Liver Alcohol Dehydrogenase
Plapp, B.V.,Eklund, H.,Jones, T.A.,Branden, C.I.
(1983) J.Biol.Chem. 258: 5537
- Refined Crystal Structure of Liver Alcohol Dehydrogenase-Nadh Complex at 1.8 A Resolution
Al-Karadaghi, S.,Cedergren-Zeppezauer, E.S.,Hovmoller, S.,Petratos, K.,Terry, H.,Wilson, K.S.
(1994) Acta Crystallogr.,Sect.D 50: 793
- Crystal Structures of the Active Site in Specifically Metal-Depleted and Cobalt-Substituted Horse Liver Alcohol Dehydrogenase Derivatives
Schneider, G.,Eklund, H.,Cedergren-Zeppezauer, E.,Zeppezauer, M.
(1983) Proc.Natl.Acad.Sci.USA 80: 5289
- Crystal Structure Determinations of Coenzyme Analogue and Substrate Complexes of Liver Alcohol Dehydrogenase. Binding of 1,4,5,6-Tetrahydronicotinamide Adenine Dinucleotide and Trans-4-(N,N-Dimethylamino)Cinnamaldehyde to the Enzyme
Cedergren-Zeppezauer, E.,Samama, J.P.,Eklund, H.
(1982) Biochemistry 21: 4895
- Crystallographic Investigations of Nicotinamide Adenine Dinucleotide Binding to Horse Liver Alcohol Dehydrogenase
Eklund, H.,Samama, J.P.,Jones, T.A.
(1984) Biochemistry 23: 5982
- 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: 14349
- Crystal-Structure Determination of Reduced Nicotinamide Adenine Dinucleotide Complex with Horse Liver Alcohol Dehydrogenase Maintained in its Apo Conformation by Zinc-Bound Imidazole
(1983) Biochemistry 22: 5761
- Pyrazole Binding in Crystalline Binary and Ternary Complexes with Liver Alcohol Dehydrogenase
Eklund, H.,Samama, J.P.,Wallen, L.
(1982) Biochemistry 21: 4858
- Structural Differences between Apo-and Holoenzyme of Horse Liver Alcohol Dehydrogenase
Eklund, H.,Branden, C.I.
(1979) J.Biol.Chem. 254: 3458
We present evidence that the size of an active site side chain may modulate the degree of hydrogen tunneling in an enzyme-catalyzed reaction. Primary and secondary kH/kT and kD/kT kinetic isotope effects have been measured for the oxidation of benzyl ...
We present evidence that the size of an active site side chain may modulate the degree of hydrogen tunneling in an enzyme-catalyzed reaction. Primary and secondary kH/kT and kD/kT kinetic isotope effects have been measured for the oxidation of benzyl alcohol catalyzed by horse liver alcohol dehydrogenase at 25 degrees C. As reported in earlier studies, the relationship between secondary kH/kT and kD/kT isotope effects provides a sensitive probe for deviations from classical behavior. In the present work, catalytic efficiency and the extent of hydrogen tunneling have been correlated for the alcohol dehydrogenase-catalyzed hydride transfer among a group of site-directed mutants at position 203. Val-203 interacts with the opposite face of the cofactor NAD+ from the alcohol substrate. The reduction in size of this residue is correlated with diminished tunneling and a two orders of magnitude decrease in catalytic efficiency. Comparison of the x-ray crystal structures of a ternary complex of a high-tunneling (Phe-93 --> Trp) and a low-tunneling (Val-203 --> Ala) mutant provides a structural basis for the observed effects, demonstrating an increase in the hydrogen transfer distance for the low-tunneling mutant. The Val-203 --> Ala ternary complex crystal structure also shows a hyperclosed interdomain geometry relative to the wild-type and the Phe-93 --> Trp mutant ternary complex structures. This demonstrates a flexibility in interdomain movement that could potentially narrow the distance between the donor and acceptor carbons in the native enzyme and may enhance the role of tunneling in the hydride transfer reaction.
Department of Chemistry, University of California, Berkeley 94720, USA.