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Ethylene glycol metabolism by Pseudomonas putida
Björn Mückschel1, Oliver Simon, Janosch Klebensberger
1Institute of Technical Biochemistry, University of Stuttgart, Stuttgart, Germany.
Applied and Environmental Microbiology
|October 2, 2012
Summary
Pseudomonas putida strains metabolize ethylene glycol via distinct pathways. Strain JM37 efficiently utilizes ethylene glycol, while KT2440 accumulates intermediates, highlighting potential for glyoxylic acid biocatalysis.
Area of Science:
- Microbiology
- Biochemistry
- Metabolic Engineering
Background:
- Ethylene glycol is a common industrial chemical with potential for biotransformation.
- Understanding microbial metabolism is crucial for developing biocatalytic processes.
Purpose of the Study:
- To elucidate the ethylene glycol metabolism in Pseudomonas putida strains KT2440 and JM37.
- To identify key enzymes and metabolic pathways involved.
- To assess the potential of P. putida for glyoxylic acid production.
Main Methods:
- Growth and bioconversion experiments.
- Directed mutagenesis.
- Comparative proteome analysis.
Main Results:
- Strain JM37 exhibited rapid growth on ethylene glycol; strain KT2440 showed slower metabolism with intermediate accumulation.
- Proteomics revealed differential enzyme induction, including tartronate semialdehyde synthase (Gcl), malate synthase (GlcB), and isocitrate lyase (AceA) in JM37.
- Both strains utilize periplasmic pyrroloquinoline quinone (PQQ)-dependent dehydrogenases (PedE, PedH) for initial ethylene glycol oxidation.
- A novel metabolic pathway for ethylene glycol in P. putida was proposed.
Conclusions:
- Pseudomonas putida possesses diverse ethylene glycol metabolic capabilities.
- Strain-specific enzyme expression influences metabolic efficiency.
- P. putida serves as a promising platform for whole-cell biocatalysis of ethylene glycol to glyoxylic acid.
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