These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Regulation of exotoxin A synthesis in Pseudomonas aeruginosa: characterization of toxA-lacZ fusions in wild-type and mutant strains.
    Author: Vasil ML, Grant CC, Prince RW.
    Journal: Mol Microbiol; 1989 Mar; 3(3):371-81. PubMed ID: 2501631.
    Abstract:
    A mobilizable plasmid which carries the promoter for the exotoxin A (ETA) structural gene fused to lacZ was integrated into the chromosome of wild-type and mutant strains of Pseudomonas aeruginosa at the toxA locus by homologous recombination. beta-galactosidase synthesis in the strains (cointegrates) carrying the toxA-lacZ fusions was regulated like ETA synthesis is in P. aeruginosa. Two multicopy plasmids carrying a positive regulatory gene designated toxR were constructed which are identical except with respect to the orientation of toxR to the lacZ promoter on the plasmid. These plasmids were then introduced into P. aeruginosa cointegrate strains. When toxR was using its own promoter, synthesis of beta-galactosidase in the cointegrate strains was increased but the pattern of iron regulation was not altered. In contrast, when the lacZ promoter was directing synthesis of the toxR product in the cointegrate strains, iron regulation of beta-galactosidase and ETA synthesis were abolished.
    [Abstract] [Full Text] [Related] [New Search]