Cloning, sequencing, and expression of the Escherichia coli cytolethal distending toxin genes

C. L. Pickett, D. L. Cottle, E. C. Pesci, G. Bikah

Research output: Contribution to journalArticlepeer-review

167 Scopus citations

Abstract

A limited number of Escherichia coli isolates which produce an apparently novel toxin, termed cytolethal distending toxin (CDT), have been reported. The toxic activity produced by these strains causes certain cultured cell lines to become slowly distended and then disintegrate. DNA was isolated from the CDT-producing E. coli strain, 9142-88, and cloned into a cosmid vector. Plasmid DNA from a toxin-positive transductant was further subcloned until a plasmid with a 4-kb insert which still encoded the toxin activity was obtained. Nucleotide sequencing of a portion of this insert revealed the presence of three adjacent open reading frames. Further subcloning and deletion analysis suggested that the products of all three open reading frames may be required for toxin activity. Minicell experiments identified the products of all three open reading frames. The three proteins had predicted sizes of 27,753, 29,531, and 19,938 Da, and all three appeared to have strong consensus leader sequences. None of the three predicted proteins had significant homology to known proteins.

Original languageEnglish
Pages (from-to)1046-1051
Number of pages6
JournalInfection and Immunity
Volume62
Issue number3
DOIs
StatePublished - 1994

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

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