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Mechanism from isotope effects

P F Cook1

  • 1Department of Chemistry and Biochemistry, University of Oklahoma, Norman 73072, USA.

Isotopes in Environmental and Health Studies
|December 17, 1998
PubMed
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Isotope effects are versatile tools for determining reaction mechanisms in both organic and enzyme-catalyzed reactions. This study develops theory and methods to interpret isotope effect data for complex enzymatic processes.

Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Enzyme Mechanisms

Background:

  • Isotope effects are crucial for elucidating reaction mechanisms.
  • Interpreting isotope effects in enzyme reactions is complex due to multiple rate-limiting steps.
  • Leveraging multi-step rate limitation provides insights into enzyme mechanisms.

Purpose of the Study:

  • Develop simple theory for applying isotope effects to reaction mechanisms.
  • Apply isotope effect theory to organic and enzyme-catalyzed reactions.
  • Illustrate techniques for measuring isotope effects.

Main Methods:

  • Development of simple theory for isotope effect analysis.
  • Application of theory to organic and enzymatic reactions.
  • Discussion of measurement techniques (competitive, noncompetitive, radioisotope, stable isotope, hydrogen vs. heavier atoms).

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Main Results:

  • Demonstrated application of isotope effects to determine reaction mechanisms.
  • Illustrated how isotope effects reveal reactant addition and product release orders in enzymes (e.g., 6-phosphogluconate and alcohol dehydrogenase reactions).
  • Showcased the use of multiple isotope effects to differentiate between stepwise and concerted reactions (e.g., formate, glucose 6-phosphate dehydrogenase, and malic enzyme reactions).

Conclusions:

  • Isotope effects are powerful tools for mechanistic enzymology.
  • The presented theory and methods aid in understanding complex enzyme reaction pathways.
  • Isotope effect analysis provides detailed mechanistic information, including reaction order and stereochemistry.