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Redox reactive reagents inhibiting and inactivating choline acetyltransferase
P J Patel1, E R Wohlfeil, S S Stahl
1Department of Medicinal and Biological Chemistry, College of Pharmacy, University of Toledo, OH 43606.
Biochemical and Biophysical Research Communications
|March 15, 1991
Summary
Two novel redox-reactive compounds, 3-trimethylammoniomethyl catechol and catecholine, were synthesized. Both compounds weakly inhibit and irreversibly inactivate choline acetyltransferase, impacting cholinergic neuronal function.
Area of Science:
- Biochemistry
- Neuroscience
- Medicinal Chemistry
Background:
- Cholinergic neuronal function relies on choline binding macromolecules.
- 3-Trimethylammoniomethyl catechol inactivates the nicotinic acetylcholine receptor.
- Quaternary ammonium compounds can modulate neurotransmission.
Purpose of the Study:
- Synthesize N,N-dimethylepinephrine (catecholine).
- Investigate the inhibitory and inactivating effects of 3-trimethylammoniomethyl catechol and catecholine on choline acetyltransferase.
- Characterize the mechanism of enzyme inhibition.
Main Methods:
- Chemical synthesis of catecholine.
- Enzyme kinetics assays to determine inhibition constants (Ki) for choline acetyltransferase.
- Enzyme inactivation studies to assess irreversible effects.
Main Results:
- Both 3-trimethylammoniomethyl catechol and catecholine were synthesized.
- Both compounds act as weak noncompetitive inhibitors of choline acetyltransferase (Ki values of 15 +/- 6 mM and 25 +/- 4 mM, respectively).
- Both agents irreversibly inactivate choline acetyltransferase.
Conclusions:
- 3-Trimethylammoniomethyl catechol and catecholine are redox-reactive compounds with potential to modulate cholinergic pathways.
- These compounds inhibit and irreversibly inactivate choline acetyltransferase, suggesting a role in regulating acetylcholine synthesis.
- Further research may explore their therapeutic potential in neurological disorders affecting cholinergic systems.