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Inactivation Mechanism of the Fatty Acid Amide Hydrolase Inhibitor BIA 10-2474
Nuno M F S A Cerqueira1, Marco Neves1, Juliana Rocha2
1Department of Research & Development BIAL, Portela & Cª. S.A., S. Mamede do Coronado, Portugal.
BIA 10-2474 irreversibly inhibits fatty acid amide hydrolase (FAAH) through target-specific covalent binding. This mechanism, involving a unique role for FAAH Thr236, explains the drug
Area of Science:
- Biochemistry
- Pharmacology
- Computational Chemistry
Background:
- BIA 10-2474, a fatty acid amide hydrolase (FAAH) inhibitor, was investigated for neurological conditions.
- Clinical trials were halted due to severe adverse events, including a fatality.
Purpose of the Study:
- To elucidate the mechanism of FAAH inhibition by BIA 10-2474.
- To understand the molecular interactions leading to irreversible enzyme inactivation.
Main Methods:
- Quantum mechanics calculations.
- Molecular modeling studies.
- Enzyme kinetics and structural analysis.
Main Results:
- BIA 10-2474 acts as a target-specific covalent inhibitor of FAAH.
- Inhibition involves a weakly reactive electrophile forming an irreversible adduct with the catalytic nucleophile.
- FAAH Thr236 plays a crucial role in stabilizing the inhibitor and facilitating the reaction.
Conclusions:
- The mechanism of irreversible FAAH inhibition by BIA 10-2474 is characterized by target-specific covalent binding.
- The unique interaction with Thr236 contributes to the specificity and potency of the inhibition.
- Understanding this mechanism provides insights into potential off-target effects and drug development strategies.
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