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| | <StructureSection load='4pho' size='340' side='right'caption='[[4pho]], [[Resolution|resolution]] 2.12Å' scene=''> | | <StructureSection load='4pho' size='340' side='right'caption='[[4pho]], [[Resolution|resolution]] 2.12Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4pho]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PHO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4PHO FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4pho]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PHO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4PHO FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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]] 2.123Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">hlyE, clyA, hpr, sheA, ycgD, b1182, JW5181 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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=4pho FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4pho OCA], [http://pdbe.org/4pho PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4pho RCSB], [http://www.ebi.ac.uk/pdbsum/4pho PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4pho 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=4pho FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4pho OCA], [https://pdbe.org/4pho PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4pho RCSB], [https://www.ebi.ac.uk/pdbsum/4pho PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4pho ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/HLYE_ECOLI HLYE_ECOLI]] Toxin, which has some hemolytic activity towards mammalian cells. Acts by forming a pore-like structure upon contact with mammalian cells.<ref>PMID:14532000</ref> | + | [https://www.uniprot.org/uniprot/HLYE_ECOLI HLYE_ECOLI] Toxin, which has some hemolytic activity towards mammalian cells. Acts by forming a pore-like structure upon contact with mammalian cells.<ref>PMID:14532000</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | | | |
| | ==See Also== | | ==See Also== |
| - | *[[Hemolysin|Hemolysin]] | + | *[[Hemolysin 3D structures|Hemolysin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Ecoli]] | + | [[Category: Escherichia coli K-12]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Ban, N]] | + | [[Category: Ban N]] |
| - | [[Category: Glockshuber, R]] | + | [[Category: Glockshuber R]] |
| - | [[Category: Roderer, D J.A]] | + | [[Category: Roderer DJA]] |
| - | [[Category: Alpha pore-forming toxin]]
| + | |
| - | [[Category: Intramolecular disulfide bond]]
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| - | [[Category: Toxin]]
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| Structural highlights
Function
HLYE_ECOLI Toxin, which has some hemolytic activity towards mammalian cells. Acts by forming a pore-like structure upon contact with mammalian cells.[1]
Publication Abstract from PubMed
The alpha-pore-forming toxin Cytolysin A (ClyA) is responsible for the hemolytic phenotype of several Escherichia coli and Salmonella enterica strains. ClyA is a soluble, 34 kDa monomer that assembles into a dodecameric pore complex in the presence of membranes or detergent. The comparison of the X-ray structures of monomeric ClyA and the ClyA protomer in the pore complex revealed one of the largest conformational transitions observed so far in proteins, involving the structural rearrangement of more than half of all residues, which is consistent with the finding that conversion from the monomer to the assembly competent protomer is rate-limiting for pore assembly. Here, we introduced artificial disulfide bonds at two distinct sites into the ClyA monomer that both prevent a specific structural rearrangement required for protomer formation. Using electron microscopy and hemolytic activity assays, we show that the engineered disulfides indeed trap these ClyA variants in an assembly incompetent state. Assembly of the variants into functional pore complexes can be completely recovered by disulfide reduction. The assembly kinetics of the ClyA variants recorded with circular dichroism and fluorescence spectroscopy revealed the same mechanism of protomer formation that was observed for wild-type ClyA, proceeding via an intermediate with decreased secondary structure content.
Characterization of Variants of the Pore-Forming Toxin ClyA from Escherichia coli Controlled by a Redox Switch.,Roderer D, Benke S, Muller M, Fah-Rechsteiner H, Ban N, Schuler B, Glockshuber R Biochemistry. 2014 Sep 30. PMID:25222267[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Wai SN, Lindmark B, Soderblom T, Takade A, Westermark M, Oscarsson J, Jass J, Richter-Dahlfors A, Mizunoe Y, Uhlin BE. Vesicle-mediated export and assembly of pore-forming oligomers of the enterobacterial ClyA cytotoxin. Cell. 2003 Oct 3;115(1):25-35. PMID:14532000
- ↑ Roderer D, Benke S, Muller M, Fah-Rechsteiner H, Ban N, Schuler B, Glockshuber R. Characterization of Variants of the Pore-Forming Toxin ClyA from Escherichia coli Controlled by a Redox Switch. Biochemistry. 2014 Sep 30. PMID:25222267 doi:http://dx.doi.org/10.1021/bi5007578
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