Ph.D., 1972, Princeton
The primary research interest of our group is the mechanism of action of enzymes. Our recent work has focused on the hydrolytic enzymes, ß-glucosidase and hyaluronidase, and the glycolytic enzyme, glyceraldehyde-3-phosphate dehydrogenase. In order to better understand the sources of the enormous catalytic efficiency, specificity and regulatory properties of enzymes we are making use of the classical probes of physical organic chemistry (e.g., structure-reactivity relationships and kinetic isotope effects). As a further probe of enzyme mechanisms we also make use of transition state analog inhibitors. These are stable compounds designed to resemble fleeting intermediates. Because of this resemblance they are bound by the enzyme much more tightly than are substrates. The more closely a transition state analog resembles the transition state the more tightly it should bind to the enzyme. Thus, we can get mechanistic information (i.e., transition state structure) by looking at reversible inhibitors.
The approach of using transition state analogs as enzyme inhibitors is useful not only in elucidating some of the structural features of the transition state but also as a basis for drug design. Indeed, there is an increasing number of drugs available which have been designed as transition state analogs for a variety of enzymes. Transition state analogs are also used in developing catalytic antibodies which can carry out reactions for which no known enzymes exist.
H Shen and LD Byers, 362, 717 (2007) Thioglycoside Hydrolysis Catalyzed by β-Glucosidase, Biochem. Biophys. Res. Commun., 362, 717 (2007) .
EM Bowers, LO Ragland and LD Byers, Salt Effects on β-Glucosidase: pH Profile Narrowing, Biochim. Biophys. Acta, 1774, 1500 (2007).
AH O'Donnell, X. Yao and LD Byers, Solvent Kinetic Isotope Effects on a-Glucosidase, Biochem. Biophys. Acta., 1703, 63 (2004) .
EB Golden, AE O'Donnell and LD Byers, Solvent Isotope Effects on Binding to Glucosidases, FASEB Journal, 17, A983 (2003).
X Yao, R Mauldin and L. Byers, Multiple Sugar Binding Sites in a-Glucosidase, Biochim. Biophys. Acta, 1645, 22 (2003).
LO Ragland and LD Byers, Salt Effects on b-Glucosidase Kinetics, FASEB Journal, 16, A535 (2002).
D Nguyen and LD Byers, a-Glucosidase Inhibition by Imidazoles, FASEB Journal, 15, 1160 (2001).
VC Rucker and LD Byers, An Assessment of Desolvation on Rates of Acetyl Transfer: Insights into Enzyme Catalysis, J. Am. Chem. Soc., 122, 8365 (2000).
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