title: Release of heat-labile enterotoxin subunits by Escherichia coli.
abstract: Most of the heat-labile enterotoxin (LT) synthesized by Escherichia coli is cell associated; however, a small portion of LT (approximately 10%) is released by bacterial cells into the culture supernatant. The LT subunit B (LT-B) produced by a cloned LT-B gene (tox B) was released in amounts equal to the parent LT release. In contrast, no release of LT subunit A (LT-A) or its smaller derivatives was observed in strains containing cloned toxA genes. The data suggest that LT-B is necessary for the release of LT-A across the bacterial membrane.
mesh_terms: D001427:Bacterial Toxins; D004274:DNA, Recombinant; D004768:Enterotoxins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins; D010957:Plasmids
chemical_list: D001427:Bacterial Toxins; D004274:DNA, Recombinant; D004768:Enterotoxins; D029968:Escherichia coli Proteins; C027538:heat-labile enterotoxin, E coli