View source for 1etn


==MOLECULAR STRUCTURE OF THE TOXIC DOMAIN OF HEAT-STABLE ENTEROTOXIN PRODUCED BY A PATHOGENIC STRAIN OF ESCHERICHIA COLI==
<StructureSection load='1etn' size='340' side='right'caption='[[1etn]], [[Resolution|resolution]] 0.89&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1etn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ETN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ETN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 0.89&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MPR:2-MERCAPTO-PROPION+ALDEHYDE'>MPR</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1etn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1etn OCA], [https://pdbe.org/1etn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1etn RCSB], [https://www.ebi.ac.uk/pdbsum/1etn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1etn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HST1_ECOLX HST1_ECOLX] Toxin which activates the particulate form of guanylate cyclase and increases cyclic GMP levels within the host intestinal epithelial cells.
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== Publication Abstract from PubMed ==
Heat-stable enterotoxins are a family of toxin peptides that are produced by enterotoxigenic Escherichia coli and consist of 18 and 19 amino acid residues (Aimoto, S., Takao, T., Shimonishi, Y., Hara, S., Takeda, T., Takeda, Y., and Miwatani, T. (1982) Eur. J. Biochem. 129, 257-263). A synthetic fully toxic analog of the enterotoxin, Mpr5-STp(5-17), where Mpr is beta-mercaptopropionic acid and which consists of 13 amino acid residues from Cys5 to Cys17 in a heat-stable enterotoxin but is deaminated at its N terminus (Kubota, H., Hidaka, Y., Ozaki, H., Ito, H., Hirayama, T., Takeda, Y., and Shimonishi, Y. (1989) Biochem. Biophys. Res. Commun. 161, 229-235), has been crystalized from water, and its crystal structure has been solved by a direct method and refined by least square procedures to give an R factor of 0.089. The crystal belongs to the orthorhombic space group P2(1)2(1)2(1) with unit cell constants a = 21.010 (2) A, b = 27.621 (4) A, and c = 12.781 (1) A. The asymmetric unit of the crystals contains one peptide molecule with 13 water molecules. A right-hand spiral peptide backbone extends throughout the molecule. Three beta-turns are located along this spiral and fixed tightly by three intramolecular disulfide linkages. The actual structure predicts the biniding region on the enterotoxin to the receptor protein on the membrane of rat intestinal epithelial cells.

Molecular structure of the toxin domain of heat-stable enterotoxin produced by a pathogenic strain of Escherichia coli. A putative binding site for a binding protein on rat intestinal epithelial cell membranes.,Ozaki H, Sato T, Kubota H, Hata Y, Katsube Y, Shimonishi Y J Biol Chem. 1991 Mar 25;266(9):5934-41. PMID:2005130<ref>PMID:2005130</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Sato T]]
[[Category: Shimonishi Y]]