Identification of essential operons with a rhamnose-inducible promoter in Burkholderia cenocepacia

Silvia T Cardona, Carmen L Mueller, Miguel A Valvano

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Scanning of bacterial genomes to identify essential genes is of biological interest, for understanding the basic functions required for life, and of practical interest, for the identification of novel targets for new antimicrobial therapies. In particular, the lack of efficacious antimicrobial treatments for infections caused by the Burkholderia cepacia complex is causing high morbidity and mortality of cystic fibrosis patients and of patients with nosocomial infections. Here, we present a method based on delivery of the tightly regulated rhamnose-inducible promoter P(rhaB) for identifying essential genes and operons in Burkholderia cenocepacia. We demonstrate that different levels of gene expression can be achieved by using two vectors that deliver P(rhaB) at two different distances from the site of insertion. One of these vectors places P(rhaB) at the site of transposon insertion, while the other incorporates the enhanced green fluorescent protein gene (e-gfp) downstream from P(rhaB). This system allows us to identify essential genes and operons in B. cenocepacia and provides a new tool for systematically identifying and functionally characterizing essential genes at the genomic level.
Original languageEnglish
Pages (from-to)2547-55
Number of pages9
JournalApplied and Environmental Microbiology
Issue number4
Publication statusPublished - Apr 2006

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Science(all)
  • Microbiology


Dive into the research topics of 'Identification of essential operons with a rhamnose-inducible promoter in Burkholderia cenocepacia'. Together they form a unique fingerprint.

Cite this