1fgb: Difference between revisions
New page: left|200px<br /> <applet load="1fgb" size="450" color="white" frame="true" align="right" spinBox="true" caption="1fgb, resolution 2.4Å" /> '''TOXIN'''<br /> ==Ov... |
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== | ==TOXIN== | ||
Cholera toxin, a heterohexameric AB5 enterotoxin released by Vibrio | <StructureSection load='1fgb' size='340' side='right'caption='[[1fgb]], [[Resolution|resolution]] 2.40Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1fgb]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_cholerae_569B Vibrio cholerae 569B]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FGB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1FGB 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]] 2.4Å</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=1fgb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fgb OCA], [https://pdbe.org/1fgb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1fgb RCSB], [https://www.ebi.ac.uk/pdbsum/1fgb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1fgb ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/CHTB_VIBCH CHTB_VIBCH] The B subunit pentameric ring directs the A subunit to its target by binding to the GM1 gangliosides present on the surface of the intestinal epithelial cells. It can bind five GM1 gangliosides. It has no toxic activity by itself. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Cholera toxin, a heterohexameric AB5 enterotoxin released by Vibrio cholera, induces a profuse secretory diarrhea in susceptible hosts. Choleragenoid, the B subunit pentamer of cholera toxin, directs the enzymatic A subunit to its target by binding the GM1 gangliosides exposed on the luminal surface of intestinal epithelial cells. The crystal structure of choleragenoid has been independently solved and refined at 2.4 A resolution by combining single isomorphous replacement with non-crystallographic symmetry averaging. The structure of the B subunits, and their pentameric arrangement, closely resembles that reported for the intact holotoxin, choleragen, the heat-labile enterotoxin from Escherichia coli, and for a choleragenoid-GM1 pentasaccharide complex. In the absence of the A subunit the central cavity of the B pentamer is a highly solvated channel. The binding of choleragenoid to the A subunit or to its receptor pentasaccharide modestly affects the local stereochemistry without perceptibly altering the subunit interface. | |||
The 2.4 A crystal structure of cholera toxin B subunit pentamer: choleragenoid.,Zhang RG, Westbrook ML, Westbrook EM, Scott DL, Otwinowski Z, Maulik PR, Reed RA, Shipley GG J Mol Biol. 1995 Aug 25;251(4):550-62. PMID:7658472<ref>PMID:7658472</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1fgb" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Cholera toxin 3D structures|Cholera toxin 3D structures]] | |||
*[[User:David Solfiell/sandbox 1|User:David Solfiell/sandbox 1]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Vibrio cholerae 569B]] | |||
[[Category: Westbrook E]] | |||
[[Category: Zhang R-G]] | |||
