Expression in Caulobacter crescentus of the phosphate-starvation-inducible porin OprP of Pseudomonas aeruginosa

Stephen G. Walker, Robert Hancock, John Smit

Research output: Contribution to journalArticle

1 Citation (Scopus)


The gene for the phosphate-starvation-inducible outer membrane protein OprP, of Pseudomonas aeruginosa was introduced into Caulobacter crescentus CB2A on a plasmid vector. As is the case in P. aeruginosa and Escherichia coli the oprP gene was inducible under conditions of limiting phosphate in C. crescentus. However, the maximal medium concentration of phosphate which still permitted induction of OprP was lower in C. crescentus (50 μM) than in P. aeruginosa (200 μM). Induction of OprP was coincident with the process of stalk elongation, known to occur in C. crescentus under phosphate starvation conditions. When induced, OprP was localized to the cell envelope and became a major membrane protein, indicating that the Pseudomonas promoter was efficiently recognized in C. crescentus and that the gene product was targeted to the appropriate region of the cell. Our data provide support for the hypothesis that the mechanism for regulation of phosphate-starvation-inducible genes is highly conserved amongst the eubacteria.

Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalFEMS Microbiology Letters
Issue number2-3
Publication statusPublished - 15 Jan 1991
Externally publishedYes


  • Plasmid vector
  • oprP Gene

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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