Crystal structure of ALIX/AIP1

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.240 

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Structural and Biochemical Studies of ALIX/AIP1 and Its Role in Retrovirus Budding

Fisher, R.D.Chung, H.Y.Zhai, Q.Robinson, H.Sundquist, W.I.Hill, C.P.

(2007) Cell 128: 841-852

  • DOI: https://doi.org/10.1016/j.cell.2007.01.035
  • Primary Citation of Related Structures:  
    2OEV, 2OEW, 2OEX

  • PubMed Abstract: 

    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.

  • Organizational Affiliation

    Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Programmed cell death 6-interacting protein705Homo sapiensMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for Q8WUM4 (Homo sapiens)
Explore Q8WUM4 
Go to UniProtKB:  Q8WUM4
GTEx:  ENSG00000170248 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8WUM4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.240 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.993α = 90
b = 98.51β = 105.64
c = 72.159γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-03-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references
  • Version 1.5: 2023-12-27
    Changes: Data collection