FIG. 8.

Consensus nucleotide sequences at DNA locations where transcription is regulated by metabolites in the β-ketoadipate pathway. The nucleotide sequence of the 216-bp XmnI-EcoRI fragment that binds PcaU contains a segment that displays identity to the pobR operator at 16 of 19 positions. The pobR operator is also closely similar to putative operators that are governed by PcaR and the inducer β-ketoadipate in P. putida. A scan for similar nucleotide sequences in the 20-kb Acinetobacter pca-qui-pob cluster revealed an additional close match directly downstream from pcaU. Arrows, inverted repetitions conserved in the consensus sequence.