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Protein flexibility and metal coordination changes in DHAP-dependent aldolases
Aurora Jiménez1, Pere Clapés, Ramon Crehuet
1Institut de Química Avançada de Catalunya IQAC-CSIC c/Jordi Girona 18-26, 08034, Barcelona, Catalonia, Spain.
Enzyme mobility influences active site chemistry and catalytic rates. Rhamnulose-1-phosphate aldolase (RhuA) and fuculose-1-phosphate aldolase (FucA) exhibit coupled domain movements and metal coordination, explaining their similar turnover rates.
Area of Science:
- Biochemistry
- Enzymology
- Computational Chemistry
Background:
- Rhamnulose-1-phosphate aldolase (RhuA) and fuculose-1-phosphate aldolase (FucA) are related enzymes catalyzing aldol reactions.
- Differences in their crystal structures suggest variations in active site metal coordination.
Purpose of the Study:
- To investigate the relationship between enzyme mobility and active site chemical properties in RhuA.
- To compare these properties with FucA and understand their impact on catalytic activity.
Main Methods:
- Normal mode analysis and high-level computational calculations on active site models.
- Comparison of structural and chemical properties between RhuA and FucA.
Main Results:
- Differences in zinc ion coordination between RhuA and FucA arise from residue spatial arrangement, not chemical differences.
- Enzyme domain mobility can interconvert active site arrangements between RhuA and FucA.
- A direct link exists between domain movements, active site metal coordination, and the energy barrier for the aldol reaction.
Conclusions:
- The study reveals a coupling between domain movements and catalytic effects in RhuA and FucA.
- This coupling provides an explanation for the similar experimental turnover rates observed for these enzymes.
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