2g3k: Difference between revisions

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[[Image:2g3k.gif|left|200px]]
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{{STRUCTURE_2g3k|  PDB=2g3k  |  SCENE=  }}  
{{STRUCTURE_2g3k|  PDB=2g3k  |  SCENE=  }}  


'''Crystal structure of the C-terminal domain of Vps28'''
===Crystal structure of the C-terminal domain of Vps28===




==Overview==
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The endosomal sorting complex I required for transport (ESCRT-I) is composed of the three subunits Vps23/Tsg101, Vps28 and Vps37. ESCRT-I is recruited to cellular membranes during multivesicular endosome biogenesis and by enveloped viruses such as HIV-1 to mediate budding from the cell. Here, we describe the crystal structure of a conserved C-terminal domain from Sacharomyces cerevisiae Vps28 (Vps28-CTD) at 3.05 A resolution which folds independently into a four-helical bundle structure. Co-expression experiments of Vps28-CTD, Vps23 and Vps37 suggest that Vps28-CTD does not directly participate in ESCRT-I assembly and may thus act as an adaptor module for downstream interaction partners. We show through mutagenesis studies that Vps28-CTD employs its strictly conserved surface in the interaction with the ESCRT-III factor Vps20. Furthermore, we present evidence that Vps28-CTD is sufficient to rescue an equine infectious anaemia virus (EIAV) Gag late domain deletion. Vps28-CTD mutations abolishing Vps20 interaction in vitro also prevent the rescue of the EIAV Gag late domain mutant consistent with a potential direct Vps28-ESCRT-III Vps20 recruitment. Therefore, the physiological relevant EIAV Gag-Alix interaction can be functionally replaced by a Gag-Vps28-CTD fusion. Because both Alix and Vps28-CTD can directly recruit ESCRT-III proteins, ESCRT-III assembly coupled to Vps4 action may therefore constitute the minimal budding machinery for EIAV release.
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==About this Structure==
==About this Structure==
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[[Category: Weissenhorn, W.]]
[[Category: Weissenhorn, W.]]
[[Category: 4 helix bundle]]
[[Category: 4 helix bundle]]
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Revision as of 09:14, 29 July 2008

File:2g3k.png

Template:STRUCTURE 2g3k

Crystal structure of the C-terminal domain of Vps28Crystal structure of the C-terminal domain of Vps28

Template:ABSTRACT PUBMED 16749904

About this StructureAbout this Structure

2G3K is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

ReferenceReference

The crystal structure of the C-terminal domain of Vps28 reveals a conserved surface required for Vps20 recruitment., Pineda-Molina E, Belrhali H, Piefer AJ, Akula I, Bates P, Weissenhorn W, Traffic. 2006 Aug;7(8):1007-16. Epub 2006 Jun 2. PMID:16749904

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