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'''Crystal structure of a core domain of stomatin from Pyrococcus horikoshii''' | '''Crystal structure of a core domain of stomatin from Pyrococcus horikoshii''' | ||
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[[Category: Matsui, I.]] | [[Category: Matsui, I.]] | ||
[[Category: Yokoyama, H.]] | [[Category: Yokoyama, H.]] | ||
[[Category: | [[Category: Archaea]] | ||
[[Category: | [[Category: Coiled-coil]] | ||
[[Category: | [[Category: Flotillin]] | ||
[[Category: | [[Category: Membrane fusion]] | ||
[[Category: | [[Category: Membrane protein]] | ||
[[Category: | [[Category: Pyrococcus horikoshii]] | ||
[[Category: | [[Category: Spfh]] | ||
[[Category: | [[Category: Stomatin]] | ||
[[Category: | [[Category: Trafficking]] | ||
[[Category: | [[Category: Transmembrane]] | ||
[[Category: | [[Category: Trimer]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 20:52:18 2008'' | |||
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Revision as of 17:52, 4 May 2008
Crystal structure of a core domain of stomatin from Pyrococcus horikoshii
Overview
Stomatin is a major integral membrane protein of human erythrocytes, the absence of which is associated with a form of hemolytic anemia known as hereditary stomatocytosis. However, the function of stomatin is not fully understood. An open reading frame, PH1511, from the hyperthermophilic archaeon Pyrococcus horikoshii encodes p-stomatin, a prokaryotic stomatin. Here, we report the first crystal structure of a stomatin ortholog, the core domain of the p-stomatin PH1511p (residues 56-234 of PH1511p, designated as PhSto(CD)). PhSto(CD) forms a novel homotrimeric structure. Three alpha/beta domains form a triangle of about 50 A on each side, and three alpha-helical segments of about 60 A in length extend from the apexes of the triangle. The alpha/beta domain of PhSto(CD) is partly similar in structure to the band-7 domain of mouse flotillin-2. While the alpha/beta domain is relatively rigid, the alpha-helical segment shows conformational flexibility, adapting to the neighboring environment. One alpha-helical segment forms an anti-parallel coiled coil with another alpha-helical segment from a symmetry-related molecule. The alpha-helical segment shows a heptad repeat pattern, and mainly hydrophobic residues form a coiled-coil interface. According to chemical cross-linking experiments, PhSto(CD) would be able to assemble into an oligomeric form. The coiled-coil fold observed in the crystal probably contributes to self-association.
About this Structure
3BK6 is a Single protein structure of sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA.
Reference
Crystal structure of a core domain of stomatin from Pyrococcus horikoshii Illustrates a novel trimeric and coiled-coil fold., Yokoyama H, Fujii S, Matsui I, J Mol Biol. 2008 Feb 22;376(3):868-78. Epub 2008 Jan 8. PMID:18182167 Page seeded by OCA on Sun May 4 20:52:18 2008
