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Title

The xylS gene positive regulator of TOL plasmid pWWO: identification, sequence analysis and overproduction leading to constitutive expression of meta cleavage operon

Authors
Mermod, Nicolas
Timmis, Kenneth N.
Published in Molecular and General Genetics. 1987, vol. 207, no. 2-3, p. 349-54
Abstract The Pseudomonas putida TOL plasmid pWWO carries an operon that specifies a meta-cleavage pathway for the catabolism of benzoate and toluates whose transcription is positively regulated by the xylS gene product. Stimulation of transcription of the operon is thought to result from activation of this protein by pathway substrates/effectors. In the present study, overexpression of the xylS gene has led to identification of the regulator as a 33 kDa protein. Overexpression of xylS also resulted in partially constitutive, i.e. effector-independent expression of the meta-cleavage operon. Determination of the polynucleotide sequence of the xylS gene revealed amino acid sequence homology with several DNA binding proteins, particularly with the araC products of Escherichia coli and Salmonella typhimurium and with the nifA and ntrC products of Klebsiella pneumoniae. Homologous sequences were mainly located in an alpha-helix-turn-alpha-helix domain of the polypeptide. Interestingly, amino acid sequence homology was also found with sigma factors of E. coli (ntrA and htpR products) and Bacillus subtilis (spoIIG and phage SPOI Gp34 products) and other RNA polymerase core-interacting proteins, such as the E. coli nusA product.
Keywords Amino Acid SequenceBacterial Proteins/geneticsBase SequenceGenesGenes, BacterialGenes, RegulatorOperonPlasmidsPseudomonas/geneticsSequence Homology, Nucleic AcidTranscription, Genetic
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PMID: 3475526
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Research group Calipho (80)
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MERMOD, Nicolas et al. The xylS gene positive regulator of TOL plasmid pWWO: identification, sequence analysis and overproduction leading to constitutive expression of meta cleavage operon. In: Molecular and General Genetics, 1987, vol. 207, n° 2-3, p. 349-54. https://archive-ouverte.unige.ch/unige:36225

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Deposited on : 2014-04-30

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