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Long-range effects and conformational flexibility of aldolase
T Heyduk1, R Michalczyk, M Kochman
1Division of Biochemistry, Technical University, Wroclaw, Poland.
The Journal of Biological Chemistry
|August 25, 1991
Summary
Rabbit muscle aldolase exhibits conformational flexibility. Enzyme structure changes in response to active-site ligand binding and modifications, demonstrating long-range communication within the molecule.
Area of Science:
- Biochemistry
- Enzymology
- Protein Dynamics
Background:
- Rabbit muscle aldolase is a key glycolytic enzyme.
- Understanding enzyme flexibility is crucial for elucidating catalytic mechanisms.
- Conformational changes can propagate long distances within proteins.
Purpose of the Study:
- To investigate the conformational flexibility of rabbit muscle aldolase.
- To study long-range interactions induced by ligand binding and chemical modifications.
- To correlate enzyme structure changes with kinetic parameters.
Main Methods:
- Monitoring microenvironment changes at Cys239 and Cys289.
- Studying effects of active-site ligand binding (fructose phosphates).
- Investigating enzyme cross-linking (Cys72-Cys338) and C-terminal tyrosine removal.
Main Results:
- Substrate binding induces conformational changes propagating from the active site.
- Differential ligand binding affects Cys239 reactivity, correlating with kinetic parameters.
- Cross-linking and tyrosine removal cause significant, long-range conformational alterations.
Conclusions:
- Rabbit muscle aldolase is a flexible enzyme.
- Conformation is sensitive to substrate type and local perturbations.
- Information is transmitted over long distances within the aldolase molecule.