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Characterization of mitochondrial monoamine oxidase of Ascaridia galli
Abstract:
Oxidative deamination of various biogenic monoamines by Ascaridia galli monoamine oxidase (MAO) was blocked by different mammalian MAO inhibitors, namely, iproniazid, trans-PcP, nialamide and pargyline and the blockade was observed to be time as well as concentration dependent. The binding of inhibitors with chick ascarid MAO was of the irreversible type and the nature of the inhibition was competitive. Pargyline showed lowest I50 (8 microM) and Ki (12 microM) values. Chlorgyline and deprenyl at 100 microM concentration inhibited MAO by about 60 and 40% respectively, indicating the presence of both type A and type B MAO in A. galli.
Insights
This study investigated the effects of mammalian monoamine oxidase (MAO) inhibitors on Ascaridia galli MAO. The inhibitors demonstrated irreversible, competitive inhibition, suggesting the presence of both MAO-A and MAO-B in A. galli.
Area of Science:
- Biochemistry
- Parasitology
- Enzymology
Background:
- Monoamine oxidase (MAO) enzymes are crucial for neurotransmitter metabolism.
- Ascaridia galli, a parasitic nematode, possesses MAO activity.
- Understanding A. galli MAO is important for potential antiparasitic drug development.
Purpose of the Study:
- To characterize the inhibition of Ascaridia galli MAO by mammalian MAO inhibitors.
- To determine the type and kinetics of MAO inhibition.
- To investigate the presence of different MAO isoforms in A. galli.
Main Methods:
- Enzyme inhibition assays using various biogenic monoamines as substrates.
- Application of mammalian MAO inhibitors including iproniazid, trans-PcP, nialamide, and pargyline.
- Time- and concentration-dependent inhibition studies were performed.
Main Results:
- Mammalian MAO inhibitors effectively blocked A. galli MAO activity in a time- and concentration-dependent manner.
- Inhibitor binding was irreversible, and inhibition was competitive.
- Pargyline exhibited the lowest IC50 (8 µM) and Ki (12 µM) values.
- Chlorgyline and deprenyl inhibited MAO by approximately 60% and 40%, respectively, at 100 µM.
Conclusions:
- Ascaridia galli MAO is inhibited by mammalian MAO inhibitors through an irreversible, competitive mechanism.
- The differential inhibition by chlorgyline and deprenyl indicates the presence of both MAO-A and MAO-B isoforms in A. galli.
- These findings provide insights into the biochemical properties of A. galli MAO and potential targets for intervention.