Abstract
The presence of isocitrate lyase and malate synthase was detected in cell-free extracts ofAcetobacter aceti, grown in a mineral medium with acetate as sole carbon source. The presence of these enzymes explains the ability of this strain to grow with ethanol or acetate as sole carbon source, which is an important characteristic in Frateur's classification system forAcetobacter. In addition to isocitrate lyase and malate synthase, these cell-free extracts were found to contain glyoxylate carboligase, tartronicsemialdehyde reductase and glycerate kinase. The induction of these enzymes during growth on acetate is thought to be caused by the very high activity of isocitrate lyase, which may lead to an accumulation of glyoxylate. The importance of this pathway in cells growing with acetate as sole carbon source for the synthesis of their carbohydrate components is discussed. The presence of the enzymes from the pathway from glyoxylate to 3-phosphoglycerate explains the ability of this strain to grow with ethyleneglycol and glycollate as sole carbon source.
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