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Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects
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Binding Isotope Effects for Interrogating Enzyme-Substrate Interactions.

Christopher F Stratton1, Myles B Poulin1, Vern L Schramm1

  • 1Albert Einstein College of Medicine, Bronx, NY, United States.

Methods in Enzymology
|September 16, 2017
PubMed
Summary
This summary is machine-generated.

Equilibrium binding isotope effects (BIEs) reveal enzyme-substrate interactions by analyzing vibrational status. This method helps understand how enzymes influence substrate reactivity, offering insights into enzyme mechanisms.

Keywords:
Analysis of binding isotope effectsCatalytic site distortionEquilibrium dialysisGround-state stabilizationInhibitor binding effectsMolecular distortionTransition-state analysis

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Chemical physics

Background:

  • Equilibrium binding isotope effects (BIEs) probe enzyme-substrate interactions.
  • BIEs provide insights into the vibrational status of substrates within the enzyme's Michaelis complex.
  • Understanding these interactions is crucial for deciphering enzyme mechanisms and substrate reactivity.

Purpose of the Study:

  • To outline a rapid equilibrium dialysis method for measuring BIEs.
  • To demonstrate the application of this method in studying enzyme-substrate interactions.
  • To investigate the substrate bonding environment in human protein lysine N-methyltransferase NSD2.

Main Methods:

  • Rapid equilibrium dialysis method for BIE measurement.
  • Application of the method to enzyme systems.
  • Analysis of substrate vibrational status in the Michaelis complex.

Main Results:

  • The study details the implementation of a rapid equilibrium dialysis technique.
  • BIEs were measured for several enzyme systems, including human NSD2.
  • The findings provide context for the range of experimental BIE values.

Conclusions:

  • BIEs offer a powerful experimental approach to study enzyme-substrate interactions.
  • The described method facilitates the investigation of enzyme-mediated atomic distortions.
  • This work contributes to understanding how enzymes modulate substrate reactivity.