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. 1995 Jan;177(2):401–412. doi: 10.1128/jb.177.2.401-412.1995

Discontinuities in the evolution of Pseudomonas putida cat genes.

J E Houghton 1, T M Brown 1, A J Appel 1, E J Hughes 1, L N Ornston 1
PMCID: PMC176604  PMID: 7814330

Abstract

The organization and transcriptional control of chromosomal cat genes (required for dissimilation of catechol by the beta-ketoadipate pathway) in the Pseudomonas putida biotype strain (ATCC 12633) are reported. Nucleotide sequence reveals that catR is separated by 135 bp from the divergently transcribed catBC,A; catC begins 21 nucleotides downstream from catB, and catA begins 41 nucleotides downstream from catC. This contrasts with the gene arrangement in other bacteria, in which catA lies several kilobases upstream from catB. Properties of Tn5 mutants confirmed earlier suggestions that catR is a transcriptional activator and indicated that catA is activated by CatR independently of its activation of catBC. CatR binds to both a DNA fragment containing the catR-catB intergenic region and another DNA fragment containing catC. Pseudomonas strain RB1 resembles P. putida in some respects. Divergence of the two Pseudomonas chromosomes was revealed as nucleotide substitution of about 10% after alignment of known portions of catR,BC,A. Divergent transcriptional controls are suggested by a cluster of nucleotide sequence modifications in Pseudomonas strain RB1 which disrupt a stem-loop structure directly upstream of catB in the P. putida chromosome. Abrupt divergence of the catR,BC,A nucleotide sequences was achieved during evolution by insertion of an 85-bp palindromic genetic element uniquely positioned downstream from P. putida catR and counterpoised by insertion of a similar palindromic sequence in the Pseudomonas strain RB1 catB-catC intergenic region. Properties of the palindromic genetic element suggest that it may serve functions analogous to those of repetitive extragenic palindromic sequences and enteric repetitive intergenic consensus sequences in enteric bacteria.

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Selected References

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