Abstract
DNA upstream of the transcription start site of the mvaAB operon of Pseudomonas mevalonii, which encodes 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase (EC 1.1.1.88) and HMG-CoA lyase (EC 4.1.3.4), contains a cis-acting regulatory element which functions in the response to mevalonate. The regulatory element resides within a 36-bp region located from 48 to 84 bp upstream of the transcription start site of mvaA. This location was inferred from the beta-galactosidase activities of P. mevalonii harboring plasmid-encoded mvaA-lacZ fusions induced by mevalonate and by DNA gel retardation and competition assays. While protein from P. mevalonii grown on mevalonate produced a band shift, protein from cells grown on succinate gave no band shift, even when mevalonate was added. The operator contains three 10-bp direct repeats with the consensus sequence TGGGTACAGT, which may be important for regulation of the mvaAB operon.
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