Campylobacter jejuni chromosomal sequences that hybridize to Vibrio cholerae and Escherichia coli LT enterotoxin genes.
Campylobacter jejuni is one of the main etiologic agents of gastrointestinal illness in developing and developed areas throughout the world. Isolation of enterotoxin-producing C. jejuni has been associated with clinical symptoms of a watery-secretory type of diarrhea. Although physiological and immunological relatedness has been demonstrated between the C. jejuni enterotoxin (CJT), the Vibrio cholerae enterotoxin (CT), and the heat-labile cholera-like Escherichia coli enterotoxin (LT), nucleotide sequence similarity between C. jejuni DNA and either the toxA, toxB, eltA or eltB genes remained to be shown. We found that binding to ganglioside GM1 prevented recognition of CJT by monoclonal antibodies directed to either CT or LT. This indicates antigenic similarity between the three enterotoxins in the ganglioside GM1-binding site. Therefore we searched for corresponding similarities at the DNA level and found, by oligodeoxynucleotide hybridization, C. jejuni chromosomal nucleotide sequences similar to the coding region for a postulated ganglioside GM1-binding site on toxB and eltB.
Calva
E
E
Departamento de Biología Molecular, Universidad Nacional Autónoma de México, Cuernavaca, Morelos.
Torres
J
J
Vázquez
M
M
Angeles
V
V
de la Vega
H
H
Ruíz-Palacios
G M
GM
D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal; D001427:Bacterial Toxins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002168:Campylobacter fetus / Q000235:genetics* / Q000472:pathogenicity; D002648:Child; D002675:Child, Preschool; D002876:Chromosomes, Bacterial; D004269:DNA, Bacterial / Q000235:genetics; D003967:Diarrhea / Q000382:microbiology; D004768:Enterotoxins / Q000235:genetics* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D004926:Escherichia coli / Q000235:genetics* / Q000472:pathogenicity; D029968:Escherichia coli Proteins; D005677:G(M1) Ganglioside / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D015345:Oligonucleotide Probes; D013045:Species Specificity; D014734:Vibrio cholerae / Q000235:genetics*
D000911:Antibodies, Monoclonal; D001427:Bacterial Toxins; D004269:DNA, Bacterial; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D015345:Oligonucleotide Probes; C037420:stN protein, Vibrio cholerae; D005677:G(M1) Ganglioside; C027538:heat-labile enterotoxin, E coli