1iaz
From Proteopedia
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|PDB= 1iaz |SIZE=350|CAPTION= <scene name='initialview01'>1iaz</scene>, resolution 1.9Å | |PDB= 1iaz |SIZE=350|CAPTION= <scene name='initialview01'>1iaz</scene>, resolution 1.9Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=SO4:SULFATE ION'>SO4</scene> | + | |LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1iaz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1iaz OCA], [http://www.ebi.ac.uk/pdbsum/1iaz PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1iaz RCSB]</span> | ||
}} | }} | ||
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[[Category: Macek, P.]] | [[Category: Macek, P.]] | ||
[[Category: Turk, D.]] | [[Category: Turk, D.]] | ||
| - | [[Category: SO4]] | ||
[[Category: beta-sandwich]] | [[Category: beta-sandwich]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:17:12 2008'' |
Revision as of 18:17, 30 March 2008
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| , resolution 1.9Å | |||||||
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| Ligands: | |||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
EQUINATOXIN II
Overview
BACKGROUND: Membrane pore-forming toxins have a remarkable property: they adopt a stable soluble form structure, which, when in contact with a membrane, undergoes a series of transformations, leading to an active, membrane-bound form. In contrast to bacterial toxins, no structure of a pore-forming toxin from an eukaryotic organism has been determined so far, an indication that structural studies of equinatoxin II (EqtII) may unravel a novel mechanism. RESULTS: The crystal structure of the soluble form of EqtII from the sea anemone Actinia equina has been determined at 1.9 A resolution. EqtII is shown to be a single-domain protein based on a 12 strand beta sandwich fold with a hydrophobic core and a pair of alpha helices, each of which is associated with the face of a beta sheet. CONCLUSIONS: The structure of the 30 N-terminal residues is the largest segment that can adopt a different structure without disrupting the fold of the beta sandwich core. This segment includes a three-turn alpha helix that lies on the surface of a beta sheet and ends in a stretch of three positively charged residues, Lys-30, Arg-31, and Lys-32. On the basis of gathered data, it is suggested that this segment forms the membrane pore, whereas the beta sandwich structure remains unaltered and attaches to a membrane as do other structurally related extrinsic membrane proteins or their domains. The use of a structural data site-directed mutagenesis study should reveal the residues involved in membrane pore formation.
About this Structure
1IAZ is a Single protein structure of sequence from Actinia equina. Full crystallographic information is available from OCA.
Reference
Crystal structure of the soluble form of equinatoxin II, a pore-forming toxin from the sea anemone Actinia equina., Athanasiadis A, Anderluh G, Macek P, Turk D, Structure. 2001 Apr 4;9(4):341-6. PMID:11525171
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