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'''Unreleased structure'''


The entry 6ial is ON HOLD
==Porcine E.coli heat-labile enterotoxin B-pentamer in complex with Lacto-N-neohexaose==
<StructureSection load='6ial' size='340' side='right' caption='[[6ial]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6ial]] is a 10 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IAL OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6IAL FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2xrs|2xrs]], [[2xrq|2xrq]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6ial FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ial OCA], [http://pdbe.org/6ial PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ial RCSB], [http://www.ebi.ac.uk/pdbsum/6ial PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ial ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/ELBP_ECOLX ELBP_ECOLX]] The biological activity of the toxin is produced by the A chain, which activates intracellular adenyl cyclase.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Diarrhea caused by enterotoxigenic Escherichia coli (ETEC) is one of the leading causes of mortality in children under five years of age and is a great burden on developing countries. The major virulence factor of the bacterium is the heat-labile enterotoxin (LT), a close homologue of the cholera toxin. The toxins bind to carbohydrate receptors in the gastrointestinal tract, leading to toxin uptake and, ultimately, to severe diarrhea. Previously, LT from human- and porcine-infecting ETEC (hLT and pLT, respectively) were shown to have different carbohydrate-binding specificities, in particular with respect to N-acetyllactosamine-terminating glycosphingolipids. Here, we probed 11 single-residue variants of the heat-labile enterotoxin with surface plasmon resonance spectroscopy and compared the data to the parent toxins. In addition we present a 1.45 A crystal structure of pLTB in complex with branched lacto-N-neohexaose (Galbeta4GlcNAcbeta6[Galbeta4GlcNAcbeta3]Galbeta4Glc). The largest difference in binding specificity is caused by mutation of residue 94, which links the primary and secondary binding sites of the toxins. Residue 95 (and to a smaller extent also residues 7 and 18) also contribute, whereas residue 4 shows no effect on monovalent binding of the ligand and may rather be important for multivalent binding and avidity.


Authors:  
Specificity of Escherichia coli Heat-Labile Enterotoxin Investigated by Single-Site Mutagenesis and Crystallography.,Heggelund JE, Heim JB, Bajc G, Hodnik V, Anderluh G, Krengel U Int J Mol Sci. 2019 Feb 6;20(3). pii: ijms20030703. doi: 10.3390/ijms20030703. PMID:30736336<ref>PMID:30736336</ref>


Description:  
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
<div class="pdbe-citations 6ial" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Heggelund, J E]]
[[Category: Heim, J B]]
[[Category: Krengel, U]]
[[Category: Carbohydrate]]
[[Category: Complex]]
[[Category: E coli]]
[[Category: Etec]]
[[Category: Heat-labile enterotoxin]]
[[Category: Lacto-n-neohexaose]]
[[Category: Lectin]]
[[Category: Ligand]]
[[Category: Porcine]]
[[Category: Protein-carbohydrate interaction]]
[[Category: Toxin]]
[[Category: X-ray crystal structure]]
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