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| | ==Clostridium difficile Toxin A C-terminal fragment 1 (TcdA-f1)== | | ==Clostridium difficile Toxin A C-terminal fragment 1 (TcdA-f1)== |
| - | <StructureSection load='2f6e' size='340' side='right' caption='[[2f6e]], [[Resolution|resolution]] 1.85Å' scene=''> | + | <StructureSection load='2f6e' size='340' side='right'caption='[[2f6e]], [[Resolution|resolution]] 1.85Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2f6e]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_difficilis"_hall_and_o'toole_1935 "bacillus difficilis" hall and o'toole 1935]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F6E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2F6E FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2f6e]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_difficilis"_hall_and_o'toole_1935 "bacillus difficilis" hall and o'toole 1935]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F6E OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2F6E FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">toxA, tcdA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1496 "Bacillus difficilis" Hall and O'Toole 1935])</td></tr> | + | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">toxA, tcdA ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1496 "Bacillus difficilis" Hall and O'Toole 1935])</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=2f6e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2f6e OCA], [http://pdbe.org/2f6e PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2f6e RCSB], [http://www.ebi.ac.uk/pdbsum/2f6e PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2f6e ProSAT]</span></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=2f6e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2f6e OCA], [https://pdbe.org/2f6e PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2f6e RCSB], [https://www.ebi.ac.uk/pdbsum/2f6e PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2f6e ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/TOXA_PEPDI TOXA_PEPDI]] Only after the enteral delivery of the enterotoxin A may the characteristic disease called pseudomembranous colitis be induced. | + | [[https://www.uniprot.org/uniprot/TOXA_PEPDI TOXA_PEPDI]] Only after the enteral delivery of the enterotoxin A may the characteristic disease called pseudomembranous colitis be induced. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Bacillus difficilis hall and o'toole 1935]] | | [[Category: Bacillus difficilis hall and o'toole 1935]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Ho, J G]] | | [[Category: Ho, J G]] |
| | [[Category: Ng, K K]] | | [[Category: Ng, K K]] |
| Structural highlights
Function
[TOXA_PEPDI] Only after the enteral delivery of the enterotoxin A may the characteristic disease called pseudomembranous colitis be induced.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Clostridium difficile is a major nosocomial pathogen that produces two large protein toxins [toxin A (TcdA) and toxin B (TcdB)] capable of disrupting intestinal epithelial cells. Both belong to the family of large clostridial cytotoxins, which are characterized by the presence of a repetitive C-terminal repetitive domain (CRD). In TcdA, the CRD is composed of 39 repeats that are responsible for binding to cell surface carbohydrates. To understand the molecular structural basis of cell binding by the toxins from C. difficile, we have determined a 1.85-A resolution crystal structure of a 127-aa fragment from the C terminus of the toxin A CRD. This structure reveals a beta-solenoid fold containing five repeats, with each repeat consisting of a beta-hairpin followed by a loop of 7-10 residues in short repeats (SRs) or 18 residues in long repeats (LRs). Adjacent pairs of beta-hairpins are related to each other by either 90 degree or 120 degree screw-axis rotational relationships, depending on the nature of the amino acids at key positions in adjacent beta-hairpins. Models of the complete CRDs of toxins A and B suggest that each CRD contains straight stretches of beta-solenoid composed of three to five SRs that are punctuated by kinks introduced by the presence of a single LR. These structural features provide a framework for understanding how large clostridial cytotoxins bind to cell surfaces and suggest approaches for developing novel treatments for C. difficile-associated diseases by blocking the binding of toxins to cell surfaces.
Crystal structure of receptor-binding C-terminal repeats from Clostridium difficile toxin A.,Ho JG, Greco A, Rupnik M, Ng KK Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18373-8. Epub 2005 Dec 12. PMID:16344467[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Ho JG, Greco A, Rupnik M, Ng KK. Crystal structure of receptor-binding C-terminal repeats from Clostridium difficile toxin A. Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18373-8. Epub 2005 Dec 12. PMID:16344467
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