3C3Q

ALIX Bro1-domain:CHMIP4B co-crystal structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

ALIX-CHMP4 interactions in the human ESCRT pathway.

McCullough, J.Fisher, R.D.Whitby, F.G.Sundquist, W.I.Hill, C.P.

(2008) Proc.Natl.Acad.Sci.Usa 105: 7687-7691

  • DOI: 10.1073/pnas.0801567105
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The ESCRT pathway facilitates membrane fission events during enveloped virus budding, multivesicular body formation, and cytokinesis. To promote HIV budding and cytokinesis, the ALIX protein must bind and recruit CHMP4 subunits of the ESCRT-III compl ...

    The ESCRT pathway facilitates membrane fission events during enveloped virus budding, multivesicular body formation, and cytokinesis. To promote HIV budding and cytokinesis, the ALIX protein must bind and recruit CHMP4 subunits of the ESCRT-III complex, which in turn participate in essential membrane remodeling functions. Here, we report that the Bro1 domain of ALIX binds specifically to C-terminal residues of the human CHMP4 proteins (CHMP4A-C). Crystal structures of the complexes reveal that the CHMP4 C-terminal peptides form amphipathic helices that bind across the conserved concave surface of ALIX(Bro1). ALIX-dependent HIV-1 budding is blocked by mutations in exposed ALIX(Bro1) residues that help contribute to the binding sites for three essential hydrophobic residues that are displayed on one side of the CHMP4 recognition helix (M/L/IxxLxxW). The homologous CHMP1-3 classes of ESCRT-III proteins also have C-terminal amphipathic helices, but, in those cases, the three hydrophobic residues are arrayed with L/I/MxxxLxxL spacing. Thus, the distinct patterns of hydrophobic residues provide a "code" that allows the different ESCRT-III subunits to bind different ESCRT pathway partners, with CHMP1-3 proteins binding MIT domain-containing proteins, such as VPS4 and Vta1/LIP5, and CHMP4 proteins binding Bro1 domain-containing proteins, such as ALIX.


    Organizational Affiliation

    Department of Biochemistry, University of Utah, Salt Lake City, UT 84112-5650, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Programmed cell death 6-interacting protein
A
380Homo sapiensMutation(s): 0 
Gene Names: PDCD6IP (AIP1, ALIX, KIAA1375)
Find proteins for Q8WUM4 (Homo sapiens)
Go to Gene View: PDCD6IP
Go to UniProtKB:  Q8WUM4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Charged multivesicular body protein 4b peptide
B
18Homo sapiensMutation(s): 0 
Gene Names: CHMP4B (C20orf178, SHAX1)
Find proteins for Q9H444 (Homo sapiens)
Go to Gene View: CHMP4B
Go to UniProtKB:  Q9H444
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.228 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 120.515α = 90.00
b = 62.586β = 121.51
c = 76.053γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
REFMACphasing
SCALEPACKdata scaling
HKL-2000data reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance