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Heat-stable enterotoxin

Heat-stable enterotoxin B, secretory
Symbol STb_secrete
Pfam PF09075
InterPro IPR015160
SCOP 1ehs
OPM protein 1ehs
Available PDB structures:

1ehs :24-71

Heat-stable enterotoxins are secretory peptides produced by some bacterial strains. These peptides keep their 3D structure and remain active at 100oC. Different STs recognize distinct receptors on the cell surface and thereby affect different intracellular signaling pathways. For example, STa enterotoxins bind and activate membrane-bound guanylate cyclase, which leads to the intracellular accumulation of cyclic GMP and downstream effects on several signaling pathways. These events lead to the loss of electrolytes and water from intestinal cells.

Members of heat-stable enterotoxin B family assume a helical secondary structure, with two alpha helices forming a disulphide cross-linked alpha-helical hairpin. The disulphide bonds are crucial for the toxic activity of the protein, and are required for maintenance of the tertiary structure, and subsequent interaction with the particulate form of guanylate cyclase, increasing cyclic GMP levels within the host intestinal epithelial cells[1].


  1. ^ Rizo J, Gierasch LM, Sukumar M, Wall M, Dreyfus LA, Kupersztoch YM (1995). "The structure of Escherichia coli heat-stable enterotoxin b by nuclear magnetic resonance and circular dichroism". Protein Sci. 4 (9): -. PMID 8528070.

This article includes text from the public domain Pfam and InterPro IPR015160

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Heat-stable_enterotoxin". A list of authors is available in Wikipedia.
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