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Point Mutations at a Key Site Alter the Cytochrome P450 OleP Structural Dynamics
Linda Celeste Montemiglio1, Elena Gugole2, Ida Freda2
1Institute of Molecular Biology and Pathology, CNR c/o Department of Biochemical Sciences "A. Rossi Fanelli", University of Rome, Sapienza, P.le A. Moro 5, 00185 Rome, Italy.
Investigating a cavity in cytochrome P450 OleP reveals its crucial role in substrate binding. Modifying this cavity impacts enzyme activity and offers potential for redirecting OleP
Area of Science:
- Biochemistry
- Enzymology
- Structural Biology
Background:
- Cytochrome P450 OleP undergoes significant conformational changes upon substrate binding.
- A specific cavity forms during substrate binding, mediating interactions via solvent molecules.
Purpose of the Study:
- To investigate the role of the substrate-induced cavity in OleP's binding mechanism.
- To analyze the impact of altering cavity volume on substrate-enzyme interactions and binding properties.
Main Methods:
- Site-directed mutagenesis to create three OleP variants (E89Y, G92W, S240Y).
- X-ray crystallography to determine the structures of OleP mutants bound to 6-deoxyerythronolide B (6DEB).
- Equilibrium titrations and molecular dynamic simulations to assess binding properties and conformational dynamics.
Main Results:
- Mutants G92W and S240Y filled the cavity, introducing new substrate contact points.
- Mutant E89Y increased the cavity volume by altering side-chain conformation.
- Altering cavity volume perturbed the conformational landscape and impacted enzyme binding properties.
Conclusions:
- The analyzed cavity is a critical substrate-protein contact site in OleP.
- The cavity's volume influences OleP's binding characteristics and conformational dynamics.
- Targeting this cavity could enable the redirection of OleP's enzymatic activity.
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