A unique DNA sequence of human enterotoxigenic Escherichia coli enterotoxin encoded by chromosomal DNA

Seiji Imamura, Nobuo Kido, Michio Kato, Hidetsugu Kawase, Akio Miyama, Takao Tsuji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We detected Ent plasmids in 300 strains of human enterotoxigenic Escherichia coli, but one strain, E. coli 240-3, had neither a small nor a large plasmid and encoded the heat-labile enterotoxin (LTh(240-3)) gene on its chromosome. DNA sequences showed that LTh(240-3) differed by 12 and 14 base pairs from LT (LTh) and LT (LTp) from human H10407 and porcine EWD299 strains, respectively. In deduced precursor toxins, LTh(240-3), LTh and LTp differed from LTh, LTp and LTh(240-3) at nine, eight and eleven positions, respectively. These data suggest that although LTh(240-3) encoded in the chromosome is antigenically similar to LTh, it cannot be grouped with LTh due to differences in its DNA and amino acids sequences.

Original languageEnglish
Pages (from-to)241-245
Number of pages5
JournalFEMS Microbiology Letters
Volume146
Issue number2
DOIs
Publication statusPublished - 15-01-1997

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology
  • Genetics

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