Location of the enterotoxin gene from Salmonella typhimurium and characterization of the gene products

P. Chary, R. Prasad, Ashok Chopra, Johnny Peterson

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The enterotoxin gene (stn) in Salmonella typhimurium (Q1 strain) was confined to an 800 bp ClaI-EcoRI genomic DNA fragment (pCE3) that coded for two polypeptides (25 and 12 kDa) under the control of the T7 RNA polymerase/promoter system. The appearance of the 25 kDa protein corresponded to the enterotoxic activity, as determined by elongation of Chinese hamster ovary (CHO) cells, fluid accumulation in rabbit intestinal loops, and altered vascular permeability in rabbit skin. The stn gene products (STN) caused an elevation of intracellular cAMP in CHO cells. These values were at control levels in stn mutants devoid of enterotoxicity, and the 25-kDa protein concurrently disappeared. The biological activity of the heat-labile enterotoxin was blocked by GM1 ganglioside and neutralized by affinity-purified antibodies made against cholera toxin. The 12 kDa protein however was not correlated with an enterotoxic response.

Original languageEnglish (US)
Pages (from-to)87-92
Number of pages6
JournalFEMS Microbiology Letters
Volume111
Issue number1
DOIs
StatePublished - Jul 15 1993

Fingerprint

Enterotoxins
Salmonella typhimurium
Cricetulus
Ovary
Genes
Rabbits
G(M1) Ganglioside
Proteins
Antibody Affinity
Cholera Toxin
Capillary Permeability
Hot Temperature
Skin
Peptides
DNA

Keywords

  • cAMP
  • Salmonella typhimurium
  • STN
  • stn Gene
  • stn Mutant
  • T7 RNA polymerase/promoter

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

Cite this

Location of the enterotoxin gene from Salmonella typhimurium and characterization of the gene products. / Chary, P.; Prasad, R.; Chopra, Ashok; Peterson, Johnny.

In: FEMS Microbiology Letters, Vol. 111, No. 1, 15.07.1993, p. 87-92.

Research output: Contribution to journalArticle

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