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2-Phenylethylamine catabolism by Escherichia coli K12
S Parrott1, S Jones, R A Cooper
1Department of Biochemistry, University of Leicester, UK.
Journal of General Microbiology
|February 1, 1987
Summary
Escherichia coli K12 utilizes 2-phenylethylamine as a carbon source by converting it to phenylacetic acid. This metabolic pathway involves inducible enzymes, including amine oxidase and phenylacetaldehyde dehydrogenase.
Area of Science:
- Microbiology
- Biochemistry
- Metabolic Engineering
Background:
- Escherichia coli K12 can metabolize various compounds as sole carbon and energy sources.
- The metabolic pathways for utilizing aromatic compounds are crucial for microbial survival and environmental adaptation.
Purpose of the Study:
- To elucidate the metabolic pathway used by Escherichia coli K12 to grow on 2-phenylethylamine.
- To identify the key enzymes involved in the catabolism of 2-phenylethylamine.
Main Methods:
- Culturing Escherichia coli K12 with 2-phenylethylamine as the sole carbon source.
- Enzyme activity assays to measure amine oxidase and dehydrogenase activity.
- Isolation and characterization of mutants defective in key metabolic enzymes.
Main Results:
- Escherichia coli K12 converts 2-phenylethylamine to phenylacetic acid via phenylacetaldehyde.
- An inducible amine oxidase produces phenylacetaldehyde, with a sixfold increase in catalase activity to manage hydrogen peroxide.
- An inducible NAD+-dependent dehydrogenase oxidizes phenylacetaldehyde to phenylacetic acid.
Conclusions:
- Phenylacetaldehyde dehydrogenase is essential for Escherichia coli K12 to utilize 2-phenylethylamine as a carbon and energy source.
- Mutants lacking functional phenylacetaldehyde dehydrogenase can still use 2-phenylethylamine as a nitrogen source, indicating distinct metabolic routes.