4ABM

Crystal Structure of CHMP4B hairpin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Cc2D1A is a Regulator of Escrt-III Chmp4B.

Martinelli, N.Hartlieb, B.Usami, Y.Sabin, C.Dordor, A.Miguet, N.Avilov, S.V.Ribeiro, E.A.Gottlinger, H.Weissenhorn, W.

(2012) J.Mol.Biol. 419: 75

  • DOI: 10.1016/j.jmb.2012.02.044

  • PubMed Abstract: 
  • Endosomal sorting complexes required for transport (ESCRTs) regulate diverse processes ranging from receptor sorting at endosomes to distinct steps in cell division and budding of some enveloped viruses. Common to all processes is the membrane recrui ...

    Endosomal sorting complexes required for transport (ESCRTs) regulate diverse processes ranging from receptor sorting at endosomes to distinct steps in cell division and budding of some enveloped viruses. Common to all processes is the membrane recruitment of ESCRT-III that leads to membrane fission. Here, we show that CC2D1A is a novel regulator of ESCRT-III CHMP4B function. We demonstrate that CHMP4B interacts directly with CC2D1A and CC2D1B with nanomolar affinity by forming a 1:1 complex. Deletion mapping revealed a minimal CC2D1A-CHMP4B binding construct, which includes a short linear sequence within the third DM14 domain of CC2D1A. The CC2D1A binding site on CHMP4B was mapped to the N-terminal helical hairpin. Based on a crystal structure of the CHMP4B helical hairpin, two surface patches were identified that interfere with CC2D1A interaction as determined by surface plasmon resonance. Introducing these mutations into a C-terminal truncation of CHMP4B that exerts a potent dominant negative effect on human immunodeficiency virus type 1 budding revealed that one of the mutants lost this effect completely. This suggests that the identified CC2D1A binding surface might be required for CHMP4B polymerization, which is consistent with the finding that CC2D1A binding to CHMP4B prevents CHMP4B polymerization in vitro. Thus, CC2D1A might act as a negative regulator of CHMP4B function.


    Organizational Affiliation

    Unit of Virus Host Cell Interactions UMI 3265, Université Joseph Fourier-EMBL-CNRS, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHARGED MULTIVESICULAR BODY PROTEIN 4B
A, B, C, D
79Homo sapiensMutation(s): 0 
Gene Names: CHMP4B (C20orf178, SHAX1)
Find proteins for Q9H444 (Homo sapiens)
Go to Gene View: CHMP4B
Go to UniProtKB:  Q9H444
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 37.590α = 90.00
b = 71.430β = 90.00
c = 123.680γ = 90.00
Software Package:
Software NamePurpose
iMOSFLMdata scaling
REFMACrefinement
SHELXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-09
    Type: Initial release
  • Version 1.1: 2018-01-24
    Type: Source and taxonomy