2oex
Structure of ALIX/AIP1 V Domain
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| , resolution 2.58Å | |||||||
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| Gene: | PDCD6IP, AIP1, ALIX, KIAA1375 (Homo sapiens) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
OverviewOverview
ALIX/AIP1 functions in enveloped virus budding, endosomal protein sorting, and many other cellular processes. Retroviruses, including HIV-1, SIV, and EIAV, bind and recruit ALIX through YPX(n)L late-domain motifs (X = any residue; n = 1-3). Crystal structures reveal that human ALIX is composed of an N-terminal Bro1 domain and a central domain that is composed of two extended three-helix bundles that form elongated arms that fold back into a "V." The structures also reveal conformational flexibility in the arms that suggests that the V domain may act as a flexible hinge in response to ligand binding. YPX(n)L late domains bind in a conserved hydrophobic pocket on the second arm near the apex of the V, whereas CHMP4/ESCRT-III proteins bind a conserved hydrophobic patch on the Bro1 domain, and both interactions are required for virus budding. ALIX therefore serves as a flexible, extended scaffold that connects retroviral Gag proteins to ESCRT-III and other cellular-budding machinery.
About this StructureAbout this Structure
2OEX is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Structural and biochemical studies of ALIX/AIP1 and its role in retrovirus budding., Fisher RD, Chung HY, Zhai Q, Robinson H, Sundquist WI, Hill CP, Cell. 2007 Mar 9;128(5):841-52. PMID:17350572
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