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Analysis of aluminum-yeast hexokinase interaction: modifications on protein structure and functionality
J M Socorro1, R Olmo, C Teijón
1Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad Complutense de Madrid, Spain. jmt77255@eucmax.sim.ucm.es
Journal of Protein Chemistry
|September 12, 2000
Summary
Aluminum and yeast hexokinase interaction shows distinct behaviors. Low concentrations cause aggregate formation and activity loss, while high concentrations induce structural changes, increasing inhibition.
Area of Science:
- Biochemistry
- Enzymology
- Protein-metal interactions
Background:
- Yeast hexokinase is a crucial enzyme in glucose metabolism.
- Understanding its interaction with metal ions like aluminum is vital for enzyme function studies.
Purpose of the Study:
- To investigate the effects of aluminum on yeast hexokinase structure and function.
- To correlate structural changes with alterations in enzyme activity and inhibition.
Main Methods:
- Studied the interaction between aluminum and yeast hexokinase.
- Analyzed structural changes using spectroscopic techniques.
- Assessed enzyme activity and inhibition kinetics.
Main Results:
- At low aluminum concentrations, preferential metal adsorption led to aggregate formation and continuous activity loss without significant structural changes.
- At high aluminum concentrations, monomerization and conformational changes (reduced alpha-helix, increased thermal stability, exposed hydrophobic regions) occurred.
- Protein inhibition increased, exhibiting a mixed-type, competitive component.
Conclusions:
- Aluminum affects yeast hexokinase differently based on concentration.
- Structural modifications at high concentrations may facilitate metal access to the ATP binding site, enhancing inhibition.