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[Changes in substrate specificity of brain mitochondrial monoamine oxidase]
Voprosy Meditsinskoi Khimii
|May 1, 1977
Summary
Mitochondrial monoamine oxidase (MAO) activity and substrate specificity can be reversibly altered by oxidation and reduction of its thiol groups. This modification changes MAO
Area of Science:
- Biochemistry
- Enzymology
- Neuroscience
Context:
- Mitochondrial monoamine oxidase (MAO) is crucial for neurotransmitter metabolism.
- MAO's substrate specificity is generally considered fixed.
- Understanding MAO's regulatory mechanisms is vital for neurological research.
Purpose:
- To investigate the role of thiol groups in bovine brain stem mitochondrial MAO activity.
- To determine if MAO's substrate specificity can be altered.
- To explore the reversibility of these alterations.
Summary:
- Purified bovine brain stem MAO contains 15 thiol (SH) groups per mole.
- Oxidation of 9-11 SH groups by air or H2O2 altered MAO's substrate specificity, enabling histamine and GABA deamination.
- This catalytic transformation was reversible with reducing agents and did not cause structural changes detectable by electrophoresis.
Impact:
- Reveals a novel mechanism for reversible modulation of MAO activity and substrate specificity.
- Suggests that MAO's function can be dynamically regulated.
- Provides insights into potential therapeutic targets for neurological disorders involving monoamine metabolism.