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Ethanol catabolism in Corynebacterium glutamicum.

Annette Arndt¹, Marc Auchter, Takeru Ishige

¹Institute of Microbiology and Biotechnology, University of Ulm, Ulm, Germany.

Journal of Molecular Microbiology and Biotechnology

|August 19, 2007

Summary

Corynebacterium glutamicum can utilize ethanol as a carbon source, requiring acetate activation and the glyoxylate cycle for growth. Ethanol metabolism is regulated by carbon catabolite control, with sequential utilization of glucose before ethanol.

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Area of Science:

Microbiology
Metabolic Engineering
Biotechnology

Background:

Corynebacterium glutamicum is a versatile bacterium capable of metabolizing various carbon sources.
Understanding its metabolic capabilities is crucial for optimizing industrial applications.

Purpose of the Study:

To investigate the ability of Corynebacterium glutamicum to grow on ethanol as a sole carbon source.
To elucidate the metabolic pathways and regulatory mechanisms involved in ethanol utilization.

Main Methods:

Growth experiments with wild-type and mutant strains of C. glutamicum on ethanol.
Analysis of gene expression profiles and enzyme activities (alcohol dehydrogenase, acetaldehyde dehydrogenase, acetate kinase, phosphotransacetylase, isocitrate lyase, malate synthase).
Biphasic growth studies using a mixture of glucose and ethanol.

Main Results:

C. glutamicum demonstrated significant growth on ethanol, with specific growth rates and biomass yields reported.
Mutants lacking key enzymes for acetate activation and the glyoxylate cycle could not grow on ethanol.
Gene expression and enzyme activities related to ethanol metabolism were significantly upregulated in ethanol-grown cells compared to glucose-grown cells.
Sequential utilization of glucose followed by ethanol was observed in mixed-substrate cultures, with corresponding changes in enzyme activities.

Conclusions:

Acetate activation and the glyoxylate cycle are essential for C. glutamicum to utilize ethanol.
Ethanol catabolism in C. glutamicum is subject to carbon catabolite repression.
These findings provide insights into the metabolic flexibility and regulation of C. glutamicum for potential biotechnological applications.