Abstract
Abstract Pseudomonas fragi contains a constitutive, particulate aldose dehydrogenase. The enzyme oxidizes its sugar substrates to the γ-lactone of the corresponding aldonic acids. An investigation of properties of the enzyme showed that all substrates are oxidized by a single enzyme. Though the enzyme is constitutive, growth did not seem to be correlated with oxidation of the sugar but rather with metabolism of the product of oxidation, i.e. the sugar acid. The enzymes oxidizing the sugar acids and d -arabinose have different properties from those of the aldose dehydrogenase. These enzymes are soluble, are formed by induction and are highly specific for their individual substrates.
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