Chromosomal DNA contains the gene coding for Salmonella enterotoxin

A. K. Chopra, C. W. Houston, J. W. Peterson, J. J. Mekalanos

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


This report examines the genetic basis for Salmonella enterotoxin production. The examination was conducted using an internal XbaI/HincII sequence of plasmid pJM17 encoding cholera toxin as a gene probe (ctxAB). This gene probe detected some sequence homology with the total as well as digested chromosomal DNA fragments from Salmonella strains under reduced stringent conditions in dot-blot and Southern-blot hybridization experiments. Our hybridization analysis results suggested that the enterotoxin (ent) gene of Salmonella resides on chromosomal DNA and that the Salmonella ent operon might be duplicated on the Salmonella chromosome.

Original languageEnglish (US)
Pages (from-to)345-349
Number of pages5
JournalFEMS Microbiology Letters
Issue number3
StatePublished - Sep 1987


  • (Southern-blot hybridization)
  • Salmonella enterotoxin
  • cholera toxin
  • chromosomal gene

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics


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