2g3k
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(New page: 200px<br /><applet load="2g3k" size="450" color="white" frame="true" align="right" spinBox="true" caption="2g3k, resolution 3.05Å" /> '''Crystal structure of...)
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Revision as of 08:48, 21 November 2007
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Crystal structure of the C-terminal domain of Vps28
Overview
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.
About this Structure
2G3K is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
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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