ArticleMethods in enzymology2022
Using kinetic isotope effects to probe the mechanism of adenosylcobalamin-dependent enzymes.
Article in Methods in enzymology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Adenosylcobalamin- (AdoCbl) dependent enzyme reactions involved the transfer of hydrogen atoms between the 5'-carbon of the coenzyme and the substrates and products of the reaction. Tritium and deuterium kinetic isotope effect measurements are, therefore, a valuable tool to probe the mechanisms of AdoCbl-dependent enzymes, as they can provide information about the reaction pathway and the rate-determining step. Furthermore, if the intrinsic kinetic isotope effect can be isolated, information on the nature of the transition state associated with hydrogen transfer can be obtained. In this chapter I present methods for the preparation of isotopically-labeled AdoCbl and their use in rapid chemical quench experiments that allow isotope effects on specific steps in the reaction to be isolated. These techniques are illustrated with examples from my laboratory's studies on the AdoCbl dependent enzyme, glutamate mutase.
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