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| | <StructureSection load='5aof' size='340' side='right'caption='[[5aof]], [[Resolution|resolution]] 2.45Å' scene=''> | | <StructureSection load='5aof' size='340' side='right'caption='[[5aof]], [[Resolution|resolution]] 2.45Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5aof]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"diplococcus_pneumoniae"_(klein_1884)_weichselbaum_1886 "diplococcus pneumoniae" (klein 1884) weichselbaum 1886]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AOF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5AOF FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5aof]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AOF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5AOF FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5aod|5aod]], [[5aoe|5aoe]]</td></tr> | + | </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=5aof FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5aof OCA], [https://pdbe.org/5aof PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5aof RCSB], [https://www.ebi.ac.uk/pdbsum/5aof PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5aof ProSAT]</span></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=5aof FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5aof OCA], [http://pdbe.org/5aof PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5aof RCSB], [http://www.ebi.ac.uk/pdbsum/5aof PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5aof ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/TACY_STRP2 TACY_STRP2]] Sulfhydryl-activated toxin that causes cytolysis by forming pores in cholesterol containing host membranes. After binding to target membranes, the protein undergoes a major conformation change, leading to its insertion in the host membrane and formation of an oligomeric pore complex. Cholesterol may be required for binding to host membranes, membrane insertion and pore formation. Can be reversibly inactivated by oxidation (By similarity). | + | [https://www.uniprot.org/uniprot/TACY_STRR6 TACY_STRR6] A cholesterol-dependent toxin that causes cytolysis by forming pores in cholesterol containing host membranes. After binding to target membranes, the protein undergoes a major conformation change, leading to its insertion in the host membrane and formation of an oligomeric pore complex. Cholesterol is required for binding to host membranes, membrane insertion and pore formation; cholesterol binding is mediated by a Thr-Leu pair in the C-terminus. Can be reversibly inactivated by oxidation.[UniProtKB:P13128] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Pee, K van]] | + | [[Category: Streptococcus pneumoniae]] |
| - | [[Category: Yildiz, O]] | + | [[Category: Yildiz O]] |
| - | [[Category: Cholesterol dependent cytolysin]] | + | [[Category: Van Pee K]] |
| - | [[Category: Pore forming toxin]]
| + | |
| - | [[Category: Toxin]]
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| Structural highlights
Function
TACY_STRR6 A cholesterol-dependent toxin that causes cytolysis by forming pores in cholesterol containing host membranes. After binding to target membranes, the protein undergoes a major conformation change, leading to its insertion in the host membrane and formation of an oligomeric pore complex. Cholesterol is required for binding to host membranes, membrane insertion and pore formation; cholesterol binding is mediated by a Thr-Leu pair in the C-terminus. Can be reversibly inactivated by oxidation.[UniProtKB:P13128]
Publication Abstract from PubMed
Many pathogenic bacteria produce pore-forming toxins to attack and kill human cells. We have determined the 4.5 A structure of the ~2.2 MDa pore complex of pneumolysin, the main virulence factor of Streptococcus pneumoniae, by cryoEM. The pneumolysin pore is a 400 A ring of 42 membrane-inserted monomers. Domain D3 of the soluble toxin refolds into two ~85 A beta-hairpins that traverse the lipid bilayer and assemble into a 168-strand beta-barrel. The pore complex is stabilized by salt bridges between beta-hairpins of adjacent subunits and an internal alpha-barrel. The apolar outer barrel surface with large sidechains is immersed in the lipid bilayer, while the inner barrel surface is highly charged. Comparison of the cryoEM pore complex to the prepore structure obtained by electron cryo-tomography and the x-ray structure of the soluble form reveals the detailed mechanisms by which the toxin monomers insert into the lipid bilayer to perforate the target membrane.
CryoEM structures of membrane pore and prepore complex reveal cytolytic mechanism of Pneumolysin.,van Pee K, Neuhaus A, D'Imprima E, Mills DJ, Kuhlbrandt W, Yildiz O Elife. 2017 Mar 21;6. pii: e23644. doi: 10.7554/eLife.23644. PMID:28323617[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ van Pee K, Neuhaus A, D'Imprima E, Mills DJ, Kuhlbrandt W, Yildiz O. CryoEM structures of membrane pore and prepore complex reveal cytolytic mechanism of Pneumolysin. Elife. 2017 Mar 21;6. pii: e23644. doi: 10.7554/eLife.23644. PMID:28323617 doi:http://dx.doi.org/10.7554/eLife.23644
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