Related Experiment Videos
Implications for enzymic catalysis from free-energy reaction coordinate profiles
C A Fierke1, R D Kuchta, K A Johnson
1Department of Chemistry, Pennsylvania State University, University Park 16802.
Cold Spring Harbor Symposia on Quantitative Biology
|January 1, 1987
Summary
Enzyme catalysis involves flexible reaction pathways constrained by energy changes and reagent interactions. The specific path chosen by an enzyme can optimize accuracy, couple mechanical forces, or control metabolic pathways.
Area of Science:
- Biochemistry and enzymology
- Chemical kinetics and thermodynamics
Background:
- Enzyme-bound intermediates have internal ground and transition states.
- These states are constrained by overall free-energy change and reagent binding barriers.
Purpose of the Study:
- To explore the flexibility in reaction pathways for enzyme-bound intermediates.
- To understand how enzyme function influences the choice of reaction coordinate.
Main Methods:
- Theoretical analysis of enzyme reaction mechanisms.
- Consideration of thermodynamic and kinetic constraints.
Main Results:
- Multiple reaction pathways can satisfy the energetic constraints for enzyme catalysis.
- The selected pathway is influenced by the enzyme's specific biological role.
Conclusions:
- Enzyme reaction pathways are not unique and can be adapted for various functions.
- Enzyme function dictates pathway selection for optimizing accuracy, mechanochemical coupling, or metabolic control.