View source for 1dm0


==SHIGA TOXIN==
<StructureSection load='1dm0' size='340' side='right'caption='[[1dm0]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1dm0]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Shigella_dysenteriae Shigella dysenteriae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DM0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DM0 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]] 2.5&#8491;</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=1dm0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dm0 OCA], [https://pdbe.org/1dm0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1dm0 RCSB], [https://www.ebi.ac.uk/pdbsum/1dm0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1dm0 ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/STXB_SHIDY STXB_SHIDY] The B subunit is responsible for the binding of the holotoxin to specific receptors on the target cell surface, such as globotriaosylceramide (Gb3) in human intestinal microvilli.<ref>PMID:2677606</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dm/1dm0_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1dm0 ConSurf].
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== Publication Abstract from PubMed ==
Shigella dysenteriae is the pathogen responsible for the severe form of dysentery in humans. It produces Shiga toxin, the prototype of a family of closely related bacterial protein toxins. We have determined the structure of the holotoxin, an AB5 hexamer, by X-ray crystallography. The five B subunits form a pentameric ring, encircling a helix at the carboxy terminus of the A subunit. The A subunit interacts with the B pentamer via this C-terminal helix and a four-stranded mixed beta-sheet. The fold of the rest of the A subunit is similar to that of the A chain of the plant toxin ricin; both are N-glycosidases. However, the active site in the bacterial holotoxin is blocked by a segment of polypeptide chain. These residues of the A subunit would be released as part of the activation mechanism of the toxin.

Crystal structure of the holotoxin from Shigella dysenteriae at 2.5 A resolution.,Fraser ME, Chernaia MM, Kozlov YV, James MN Nat Struct Biol. 1994 Jan;1(1):59-64. PMID:7656009<ref>PMID:7656009</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Shiga toxin 3D structures|Shiga toxin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Shigella dysenteriae]]
[[Category: Chernaia MM]]
[[Category: Fraser ME]]
[[Category: James MN]]
[[Category: Kozlov YV]]