Abstract
The tetralin biodegradation genes of Sphingomonas macrogolitabida strain TFA are repressed by catabolite. Insertion mutants in which thn genes are transcribed in the presence of a preferential carbon source and tetralin, bear the insertion in phaC, encoding a poly(3-hydroxybutyrate) (PHB) synthase, a key enzyme in PHB synthesis. Mutant complementation with phaC genes from either Ralstonia euthropha or TFA restored PHB accumulation and the wild-type regulatory pattern of thn genes, thus indicating that this accumulation is a signal for carbon sufficient conditions that prevents expression of thn catabolic genes in this α-proteobacteria.
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