Računalno istraživanje mehanizma ireverzibilne inhibicije enzima monoamin-oksidaze B

Monoamine oxidase B (MAO B) is a flavoenzyme responsible for the regulation of exogenic and endogenic amine levels in the human body, including amine neurotransmitters in the brain. This enzyme represents a crucial pharmacological target for treating Parkinson's and Alzheimer's diseases. This dissertation elucidates the mechanism of the irreversible MAO B inhibition with clinical propargylamine inhibitors, rasagiline and selegiline, and their derivatives desmethyl-selegiline and methyl-rasagiline. The quantum-chemical analysis within the cluster model showed that this reaction proceeds in three steps, with the rate-limiting abstraction of the inhibitor's α-methylene H– anion by FAD in the first step. The obtained results are in excellent agreement with experimental observations. The proposed mechanism is further characterized by the Empirical Valence Bond approach on the entire enzyme structure, whereas molecular dynamics simulations identified residues crucial for the binding. The offered insight provides important guidelines for the development of new and more effective MAO B inhibitors.