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[Specific ligand induced dimerization of allosteric enzymes]
Molekuliarnaia Biologiia
|March 1, 1982
Summary
This study analyzes a dissociating enzyme system where an inactive monomer forms an active dimer stabilized by a substrate. Enzyme kinetics reveal substrate-dependent activation and inhibition, with implications for enzyme regulation.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Protein dimerization
Context:
- Enzyme systems often involve reversible monomer-dimer transitions.
- Ligand binding, particularly substrate binding, can stabilize active dimeric enzyme forms.
- Understanding these equilibria is crucial for enzyme mechanism elucidation.
Purpose:
- To analyze the kinetic behavior of a dissociating enzyme system (inactive monomer ⇌ active dimer).
- To investigate the role of substrate concentration in enzyme reaction rate and order.
- To develop methods for calculating kinetic parameters of such systems.
Summary:
- Analyzed a dissociating enzyme system where substrate stabilizes the active dimer.
- Observed S-shaped kinetics at low substrate concentrations and substrate inhibition at high concentrations.
- Developed methods to determine enzyme system parameters from experimental data.
Impact:
- Provides insights into enzyme regulation mechanisms involving substrate-mediated dimerization.
- Characterizes the substrate order (ns) behavior, showing values >1 and approaching -2.
- Demonstrates allosteric effectors can act as activators or inhibitors based on concentration.