3PP5

High-resolution structure of the trimeric Scar/WAVE complex precursor Brk1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.159 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

High-resolution X-ray structure of the trimeric Scar/WAVE-complex precursor Brk1.

Linkner, J.Witte, G.Stradal, T.Curth, U.Faix, J.

(2011) Plos One 6: e21327-e21327

  • DOI: 10.1371/journal.pone.0021327

  • PubMed Abstract: 
  • The Scar/WAVE-complex links upstream Rho-GTPase signaling to the activation of the conserved Arp2/3-complex. Scar/WAVE-induced and Arp2/3-complex-mediated actin nucleation is crucial for actin assembly in protruding lamellipodia to drive cell migrati ...

    The Scar/WAVE-complex links upstream Rho-GTPase signaling to the activation of the conserved Arp2/3-complex. Scar/WAVE-induced and Arp2/3-complex-mediated actin nucleation is crucial for actin assembly in protruding lamellipodia to drive cell migration. The heteropentameric Scar/WAVE-complex is composed of Scar/WAVE, Abi, Nap, Pir and a small polypeptide Brk1/HSPC300, and recent work suggested that free Brk1 serves as a homooligomeric precursor in the assembly of this complex. Here we characterized the Brk1 trimer from Dictyostelium by analytical ultracentrifugation and gelfiltration. We show for the first time its dissociation at concentrations in the nanomolar range as well as an exchange of subunits within different DdBrk1 containing complexes. Moreover, we determined the three-dimensional structure of DdBrk1 at 1.5 Å resolution by X-ray crystallography. Three chains of DdBrk1 are associated with each other forming a parallel triple coiled-coil bundle. Notably, this structure is highly similar to the heterotrimeric α-helical bundle of HSPC300/WAVE1/Abi2 within the human Scar/WAVE-complex. This finding, together with the fact that Brk1 is collectively sandwiched by the remaining subunits and also constitutes the main subunit connecting the triple-coil domain of the HSPC300/WAVE1/Abi2/ heterotrimer to Sra1(Pir1), implies a critical function of this subunit in the assembly process of the entire Scar/WAVE-complex.


    Organizational Affiliation

    Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Brk1
A
73Dictyostelium discoideumMutation(s): 0 
Gene Names: brk1 (hspc300)
Find proteins for Q54X65 (Dictyostelium discoideum)
Go to UniProtKB:  Q54X65
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MRD
Query on MRD

Download SDF File 
Download CCD File 
A
(4R)-2-METHYLPENTANE-2,4-DIOL
C6 H14 O2
SVTBMSDMJJWYQN-RXMQYKEDSA-N
 Ligand Interaction
MPD
Query on MPD

Download SDF File 
Download CCD File 
A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.159 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 39.140α = 90.00
b = 39.140β = 90.00
c = 118.190γ = 120.00
Software Package:
Software NamePurpose
SHELXmodel building
SHELXphasing
ARP/wARPmodel building
XDSdata reduction
PHENIXrefinement
XSCALEdata scaling
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-03-28
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description