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Inactivation of GABA aminotransferase by 3-nitro-1-propanamine
T A Alston1, D J Porter, H J Bright
1Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia 19104.
Journal of Enzyme Inhibition
|January 1, 1987
Summary
3-Nitro-1-propanamine, a GABA analog, acts as a substrate for porcine brain GABA aminotransferase but slowly inactivates the enzyme from Pseudomonas fluorescens. The related 4-nitro-1-butanamine also inactivates both enzymes.
Area of Science:
- Biochemistry
- Enzymology
- Neuroscience
Background:
- Gamma-aminobutyric acid (GABA) is a primary inhibitory neurotransmitter in the central nervous system.
- GABA aminotransferase (GABA-AT) enzymes are crucial for GABA metabolism.
- Nitroalkanes can act as structural analogs of neurotransmitters.
Purpose of the Study:
- To investigate the interaction of 3-nitro-1-propanamine with GABA aminotransferase.
- To compare the effects of 3-nitro-1-propanamine and its homolog on different GABA-AT enzymes.
Main Methods:
- Enzyme kinetics assays using purified GABA aminotransferase from porcine brain and Pseudomonas fluorescens.
- Characterization of enzyme inactivation kinetics.
Main Results:
- 3-Nitro-1-propanamine is a suitable substrate for porcine brain GABA-AT.
- 3-Nitro-1-propanamine causes slow, reversible inactivation of Pseudomonas fluorescens GABA-AT.
- 4-Nitro-1-butanamine inactivates both porcine brain and Pseudomonas fluorescens GABA-AT.
Conclusions:
- 3-Nitro-1-propanamine exhibits differential effects on GABA aminotransferase enzymes from different sources.
- Nitroalkane compounds can act as mechanism-based inhibitors of GABA aminotransferase.