4yhd

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==Staphylococcal alpha-hemolysin H35A mutant monomer==
==Staphylococcal alpha-hemolysin H35A mutant monomer==
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<StructureSection load='4yhd' size='340' side='right' caption='[[4yhd]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
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<StructureSection load='4yhd' size='340' side='right'caption='[[4yhd]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4yhd]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YHD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4YHD FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4yhd]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YHD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YHD FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.801&#8491;</td></tr>
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<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=4yhd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yhd OCA], [http://pdbe.org/4yhd PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4yhd RCSB], [http://www.ebi.ac.uk/pdbsum/4yhd PDBsum]</span></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4yhd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yhd OCA], [https://pdbe.org/4yhd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4yhd RCSB], [https://www.ebi.ac.uk/pdbsum/4yhd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4yhd ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/HLA_STAAU HLA_STAAU]] Alpha-toxin binds to the membrane of eukaryotic cells resulting in the release of low-molecular weight molecules and leading to an eventual osmotic lysis. Heptamer oligomerization and pore formation is required for lytic activity.
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[https://www.uniprot.org/uniprot/HLA_STAAU HLA_STAAU] Alpha-toxin binds to the membrane of eukaryotic cells resulting in the release of low-molecular weight molecules and leading to an eventual osmotic lysis. Heptamer oligomerization and pore formation is required for lytic activity.
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Staphylococcal alpha-hemolysin (alpha-HL) is a beta-barrel pore-forming toxin (PFT) expressed by Staphylococcus aureus. alpha-HL is secreted as a water-soluble monomeric protein, which binds to target membranes and forms membrane-inserted heptameric pores. To explore the pore-forming mechanism of alpha-HL in detail, we determined the crystal structure of the alpha-HL monomer and prepore using H35A mutant and W179A/R200A mutant, respectively. Although the overall structure of the monomer was similar to that of other staphylococcal PFTs, a marked difference was observed in the N-terminal amino latch, which bent toward the prestem. Moreover, the prestem was fastened by the cap domain with a key hydrogen bond between Asp45 and Tyr118. Prepore structure showed that the transmembrane region is roughly formed with flexibility, although the upper half of the beta-barrel is formed appropriately. Structure comparison among monomer, prepore and pore revealed a series of motions, in which the N-terminal amino latch released upon oligomerization destroys its own key hydrogen bond betweem Asp45-Try118. This action initiated the protrusion of the prestem. Y118F mutant and the N-terminal truncated mutant markedly decreased in the hemolytic activity, indicating the importance of the key hydrogen bond and the N-terminal amino latch on the pore formation. Based on these observations, we proposed a dynamic molecular mechanism of pore formation for alpha-HL.
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Structural basis for pore-forming mechanism of staphylococcal alpha-hemolysin.,Sugawara T, Yamashita D, Kato K, Peng Z, Ueda J, Kaneko J, Kamio Y, Tanaka Y, Yao M Toxicon. 2015 Sep 28. pii: S0041-0101(15)30093-3. doi:, 10.1016/j.toxicon.2015.09.033. PMID:26428390<ref>PMID:26428390</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
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</div>
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*[[Hemolysin 3D structures|Hemolysin 3D structures]]
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<div class="pdbe-citations 4yhd" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Kato, K]]
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[[Category: Large Structures]]
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[[Category: Sugawara, T]]
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[[Category: Staphylococcus aureus]]
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[[Category: Tanaka, Y]]
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[[Category: Kato K]]
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[[Category: Yao, M]]
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[[Category: Sugawara T]]
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[[Category: Immunoglobulin like fold]]
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[[Category: Tanaka Y]]
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[[Category: Monomer]]
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[[Category: Yao M]]
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[[Category: Toxin]]
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Current revision

Staphylococcal alpha-hemolysin H35A mutant monomer

PDB ID 4yhd

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