4tsq

From Proteopedia

(Difference between revisions)

Revision as of 20:30, 3 August 2016

Crystal structure of FraC with DHPC bound (crystal form III)

Structural highlights

4tsq is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , ,
Related:	3vwi, 3wp9, 4tsl, 4tsn, 4tso, 4tsp, 4tsy
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ACTPC_ACTFR] Pore-forming protein that forms cations-selective hydrophilic pores of around 1 nm and causes cardiac stimulation and hemolysis. Pore formation is a multi-step process that involves specific recognition of membrane sphingomyelin (but neither cholesterol nor phosphatidylcholine) using aromatic rich region and adjacent phosphocholine (POC) binding site, firm binding to the membrane (mainly driven by hydrophobic interactions) accompanied by the transfer of the N-terminal region to the lipid-water interface and finally pore formation after oligomerization of several monomers.^[1]

Publication Abstract from PubMed

Pore-forming toxins (PFT) are water-soluble proteins that possess the remarkable ability to self-assemble on the membrane of target cells, where they form pores causing cell damage. Here, we elucidate the mechanism of action of the haemolytic protein fragaceatoxin C (FraC), a alpha-barrel PFT, by determining the crystal structures of FraC at four different stages of the lytic mechanism, namely the water-soluble state, the monomeric lipid-bound form, an assembly intermediate and the fully assembled transmembrane pore. The structure of the transmembrane pore exhibits a unique architecture composed of both protein and lipids, with some of the lipids lining the pore wall, acting as assembly cofactors. The pore also exhibits lateral fenestrations that expose the hydrophobic core of the membrane to the aqueous environment. The incorporation of lipids from the target membrane within the structure of the pore provides a membrane-specific trigger for the activation of a haemolytic toxin.

Structural basis for self-assembly of a cytolytic pore lined by protein and lipid.,Tanaka K, Caaveiro JM, Morante K, Gonzalez-Manas JM, Tsumoto K Nat Commun. 2015 Feb 26;6:6337. doi: 10.1038/ncomms7337. PMID:25716479^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Bellomio A, Morante K, Barlic A, Gutierrez-Aguirre I, Viguera AR, Gonzalez-Manas JM. Purification, cloning and characterization of fragaceatoxin C, a novel actinoporin from the sea anemone Actinia fragacea. Toxicon. 2009 Nov;54(6):869-80. doi: 10.1016/j.toxicon.2009.06.022. Epub 2009 Jun, 27. PMID:19563820 doi:10.1016/j.toxicon.2009.06.022
↑ Tanaka K, Caaveiro JM, Morante K, Gonzalez-Manas JM, Tsumoto K. Structural basis for self-assembly of a cytolytic pore lined by protein and lipid. Nat Commun. 2015 Feb 26;6:6337. doi: 10.1038/ncomms7337. PMID:25716479 doi:http://dx.doi.org/10.1038/ncomms7337

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4tsq"

@@ Line 1: / Line 1: @@
 ==Crystal structure of FraC with DHPC bound (crystal form III)==
 <StructureSection load='4tsq' size='340' side='right' caption='[[4tsq]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HXG:1,2-DIHEXANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>HXG</scene>, <scene name='pdbligand=PC:PHOSPHOCHOLINE'>PC</scene>, <scene name='pdbligand=SCN:THIOCYANATE+ION'>SCN</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3vwi|3vwi]], [[3wp9|3wp9]], [[4tsl|4tsl]], [[4tsn|4tsn]], [[4tso|4tso]], [[4tsp|4tsp]], [[4tsy|4tsy]]</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=4tsq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4tsq OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4tsq RCSB], [http://www.ebi.ac.uk/pdbsum/4tsq PDBsum]</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=4tsq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4tsq OCA], [http://pdbe.org/4tsq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4tsq RCSB], [http://www.ebi.ac.uk/pdbsum/4tsq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4tsq ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 11: / Line 12: @@
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
-Actinia fragacea is commonly called the "strawberry" anemone because of the distinctive yellow or green spots displayed on its red column. Its venom contains several haemolytic proteins with a molecular mass of approximately 20 kDa that can be separated by ion-exchange column chromatography. One of them was purified to homogeneity and was named fragaceatoxin C (FraC). Its 15 N-terminal residues were identified by Edman degradation and served to obtain its complete DNA coding sequence by RT-PCR. The coding region of FraC was amplified and cloned in the expression vector pBAT-4. Purified recombinant FraC consists of 179 amino acids and multiple sequence alignment with other actinoporins clearly indicates that FraC belongs to this protein family. The secondary structure, thermal stability and lytic activity of native and recombinant FraC were practically identical and exhibit the same basic features already described for equinatoxin-II and sticholysin-II.
+Pore-forming toxins (PFT) are water-soluble proteins that possess the remarkable ability to self-assemble on the membrane of target cells, where they form pores causing cell damage. Here, we elucidate the mechanism of action of the haemolytic protein fragaceatoxin C (FraC), a alpha-barrel PFT, by determining the crystal structures of FraC at four different stages of the lytic mechanism, namely the water-soluble state, the monomeric lipid-bound form, an assembly intermediate and the fully assembled transmembrane pore. The structure of the transmembrane pore exhibits a unique architecture composed of both protein and lipids, with some of the lipids lining the pore wall, acting as assembly cofactors. The pore also exhibits lateral fenestrations that expose the hydrophobic core of the membrane to the aqueous environment. The incorporation of lipids from the target membrane within the structure of the pore provides a membrane-specific trigger for the activation of a haemolytic toxin.
-Purification, cloning and characterization of fragaceatoxin C, a novel actinoporin from the sea anemone Actinia fragacea.,Bellomio A, Morante K, Barlic A, Gutierrez-Aguirre I, Viguera AR, Gonzalez-Manas JM Toxicon. 2009 Nov;54(6):869-80. doi: 10.1016/j.toxicon.2009.06.022. Epub 2009 Jun, 27. PMID:19563820<ref>PMID:19563820</ref>
+Structural basis for self-assembly of a cytolytic pore lined by protein and lipid.,Tanaka K, Caaveiro JM, Morante K, Gonzalez-Manas JM, Tsumoto K Nat Commun. 2015 Feb 26;6:6337. doi: 10.1038/ncomms7337. PMID:25716479<ref>PMID:25716479</ref>
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4tsq" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4tsq

From Proteopedia

Revision as of 20:30, 3 August 2016

Crystal structure of FraC with DHPC bound (crystal form III)

Structural highlights

Function

Publication Abstract from PubMed

References

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Proteopedia Page Contributors and Editors (what is this?)

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