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| | ==Structure of the C. difficile TcdB cysteine protease domain== | | ==Structure of the C. difficile TcdB cysteine protease domain== |
| - | <StructureSection load='3pee' size='340' side='right' caption='[[3pee]], [[Resolution|resolution]] 2.10Å' scene=''> | + | <StructureSection load='3pee' size='340' side='right'caption='[[3pee]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3pee]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Clod6 Clod6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PEE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3PEE FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3pee]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Clostridioides_difficile_630 Clostridioides difficile 630]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PEE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PEE FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=IHP:INOSITOL+HEXAKISPHOSPHATE'>IHP</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CD0660, tcdB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=272563 CLOD6])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=IHP:INOSITOL+HEXAKISPHOSPHATE'>IHP</scene></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=3pee FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pee OCA], [http://pdbe.org/3pee PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3pee RCSB], [http://www.ebi.ac.uk/pdbsum/3pee PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3pee 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=3pee FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pee OCA], [https://pdbe.org/3pee PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pee RCSB], [https://www.ebi.ac.uk/pdbsum/3pee PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pee ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/Q189K3_CLOD6 Q189K3_CLOD6] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Clod6]] | + | [[Category: Clostridioides difficile 630]] |
| - | [[Category: Garcia, K C]] | + | [[Category: Large Structures]] |
| - | [[Category: Lupardus, P J]] | + | [[Category: Garcia KC]] |
| - | [[Category: Clan cd cysteine protease]] | + | [[Category: Lupardus PJ]] |
| - | [[Category: Inositol hexakisphosphate]]
| + | |
| - | [[Category: Protease]]
| + | |
| - | [[Category: Toxin]]
| + | |
| Structural highlights
Function
Q189K3_CLOD6
Publication Abstract from PubMed
An internal cysteine protease domain (CPD) autoproteolytically regulates Clostridium difficile glucosylating toxins by releasing a cytotoxic effector domain into target cells. CPD activity is itself allosterically regulated by the eukaryote-specific molecule inositol hexakisphosphate (InsP(6)). Although allostery controls the function of most proteins, the molecular details underlying this regulatory mechanism are often difficult to characterize. Here we use chemical probes to show that apo-CPD is in dynamic equilibrium between active and inactive states. InsP(6) markedly shifts this equilibrium toward an active conformer that is further restrained upon binding a suicide substrate. Structural analyses combined with systematic mutational and disulfide bond engineering studies show that residues within a beta-hairpin region functionally couple the InsP(6)-binding site to the active site. Collectively, our results identify an allosteric circuit that allows bacterial virulence factors to sense and respond to the eukaryotic environment.
Defining an allosteric circuit in the cysteine protease domain of Clostridium difficile toxins.,Shen A, Lupardus PJ, Gersch MM, Puri AW, Albrow VE, Garcia KC, Bogyo M Nat Struct Mol Biol. 2011 Mar;18(3):364-71. Epub 2011 Feb 13. PMID:21317893[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Shen A, Lupardus PJ, Gersch MM, Puri AW, Albrow VE, Garcia KC, Bogyo M. Defining an allosteric circuit in the cysteine protease domain of Clostridium difficile toxins. Nat Struct Mol Biol. 2011 Mar;18(3):364-71. Epub 2011 Feb 13. PMID:21317893 doi:10.1038/nsmb.1990
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