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Intersubunit interactions in human cytidine deaminase.
S Vincenzetti1, S Costanzi, G Cristalli
1Dipartimento di Scienze Veterinarie, University of Camerino, Matelica (MC), Italy.
Nucleosides, Nucleotides & Nucleic Acids
|October 21, 2003
Summary
Researchers studied cytidine deaminase (CDA) interactions to develop new drugs. Wild-type CDA dissociates into inactive monomers but regains activity upon removal of a dissociating agent, unlike a specific mutant enzyme.
Area of Science:
- Biochemistry
- Enzymology
- Drug Discovery
Background:
- Cytidine deaminase (CDA) is a key enzyme in pyrimidine metabolism.
- Understanding CDA subunit interactions is crucial for designing novel cytidine-based therapeutics.
- Specific mutations can alter enzyme stability and function.
Purpose of the Study:
- To investigate intersubunit interactions of wild-type and mutant human CDA.
- To elucidate the role of specific residues in CDA quaternary structure and activity.
- To inform the development of efficient cytidine deaminase inhibitors.
Main Methods:
- Enzyme kinetics studies on wild-type and F137W/W113F mutant human CDA.
- Analysis of enzyme dissociation and re-association in the presence of SDS (sodium dodecyl sulfate).
- Assessment of inhibitor binding effects on enzyme quaternary structure.
Main Results:
- Wild-type human CDA dissociates into inactive monomers in SDS via a non-cooperative transition.
- Inactivated monomers can fully recover activity upon dialysis or dilution.
- The competitive inhibitor 5-fluorozebularine stabilizes wild-type CDA tetramers but not the F137W/W113F mutant.
Conclusions:
- Intersubunit interactions in human CDA are essential for its enzymatic activity.
- The F137W/W113F mutation disrupts the stabilizing interactions observed in the wild-type enzyme.
- Targeting these interactions could be a strategy for developing potent CDA inhibitors for therapeutic applications.