1887

Abstract

Assay procedures were developed for a soluble glycerol kinase [apparent (glycerol) 9 μm] and a probably membrane-associated, NAD-independent -glycerol-3-phosphate dehydrogenase [apparent (-glycerol 3-phosphate) 7 mM] present in A3(2). Both enzymes were cold sensitive. They were co-ordinately induced (about 35-fold) by addition of glycerol to cultures growing on arabinose as sole carbon source. Induction was rifampicin sensitive. The dehydrogenase was absent from glycerol-sensitive mutants, and both kinase and dehydrogenase were absent from glycerol non-utilizing (but glycerol-resistant) mutants, demonstrating that the two enzymes are part of the major pathway of glycerol catabolism in Circumstantial evidence suggested that their inducer is glycerol 3-phosphate rather than glycerol. The enzymes were subject to co-ordinate repression by various carbon sources, of which glucose exerted the strongest effect (a fivefold repression). Previously described mutants resistant to 2-deoxyglucose, shown here to have very low glucose kinase activity, were defective in glucose repression of the glycerol enzymes.

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1983-05-01
2021-07-30
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