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Putrescine catabolism in mammalian brain
The Biochemical Journal
|October 1, 1974
Summary
Monoacetylputrescine, unlike putrescine, is broken down by monoamine oxidase in the brain. This reveals a new pathway for putrescine degradation, ultimately producing CO2.
Area of Science:
- Biochemistry
- Neuroscience
- Metabolic pathways
Background:
- Putrescine (1,4-diaminobutane) is a substrate for diamine oxidase.
- The metabolic fate of monoacetylputrescine was previously unclear.
Purpose of the Study:
- To elucidate the in vitro and in vivo deamination pathway of monoacetylputrescine.
- To identify the enzymes and products involved in putrescine metabolism in the mammalian brain.
Main Methods:
- Enzymatic assays using monoamine oxidase.
- In vitro and in vivo studies to track metabolic products.
Main Results:
- Monoacetylputrescine is oxidatively deaminated by monoamine oxidase, yielding N-acetyl-gamma-aminobutyrate.
- A complete degradative pathway for putrescine in mammalian brain was demonstrated.
Conclusions:
- Monoamine oxidase plays a key role in monoacetylputrescine metabolism.
- The identified pathway involves acetylation, deamination, and subsequent conversion to gamma-aminobutyrate, ultimately entering the tricarboxylic acid cycle for CO2 production.