Target intelligence / Profile preview

Enterotoxigenic Escherichia coli Heat-Labile Enterotoxin (LT)

Target
LT
Molecular classification
Toxin, AB5 toxin
01

Overview

Enterotoxigenic Escherichia coli (ETEC) heat-labile enterotoxin (LT) is a major virulence factor produced by ETEC, a leading cause of diarrheal disease. LT is an AB5 toxin that binds to ganglioside GM1 via its B subunits and delivers the A subunit into host cells. The A subunit ADP-ribosylates Gsα, leading to increased cAMP levels and fluid secretion in the gut.

Other names
ETEC heat-labile enterotoxinHeat-labile enterotoxinLT toxinLTA subunitLTB subunit
02

Mechanism of action

ADP-ribosylates Gsα proteins, constitutively activating adenylate cyclase, raising intracellular cAMP levels, stimulating chloride ion secretion and inhibiting sodium absorption, leading to water efflux into the intestinal lumen and diarrhea.

03

Biological functions

ADP-ribosylation of GsαActivation of adenylate cyclaseInduction of chloride secretionInhibition of sodium absorptionMucosal adjuvant
04

Disease associations

InfectionDiarrheal disease
05

Safety considerations

Induction of watery diarrheaDisruption of intestinal epithelial structure

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