4DNN

Crystal structure of the Quaking Qua1 homodimerization domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Analysis of the Quaking Homodimerization Interface.

Beuck, C.Qu, S.Fagg, W.S.Ares, M.Williamson, J.R.

(2012) J.Mol.Biol. 423: 766-781

  • DOI: 10.1016/j.jmb.2012.08.027

  • PubMed Abstract: 
  • Quaking (QkI) is a prototypical member of the STAR (signal transducer and activator of RNA) protein family, which plays key roles in posttranscriptional gene regulation by controlling mRNA translation, stability and splicing. QkI-5 has been shown to ...

    Quaking (QkI) is a prototypical member of the STAR (signal transducer and activator of RNA) protein family, which plays key roles in posttranscriptional gene regulation by controlling mRNA translation, stability and splicing. QkI-5 has been shown to regulate mRNA expression in the central nervous system, but little is known about its roles in other tissues. STAR proteins function as dimers and bind to bipartite RNA sequences; however, the structural and functional roles of homodimerization and heterodimerization are still unclear. Here, we present the crystal structure of the QkI dimerization domain, which adopts a similar stacked helix-turn-helix arrangement as its homologs GLD-1 (germ line development defective-1) and Sam68 (Src-associated protein during mitosis, 68kDa) but differs by an additional helix inserted in the dimer interface. Variability of the dimer interface residues likely ensures selective homodimerization by preventing association with non-cognate STAR family proteins in the cell. Mutations that inhibit dimerization also significantly impair RNA binding in vitro, alter QkI-5 protein levels and impair QkI function in a splicing assay in vivo. Together, our results indicate that a functional Qua1 homodimerization domain is required for QkI-5 function in mammalian cells.


    Organizational Affiliation

    Department of Molecular Biology, Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein quaking
A, B
56Mus musculusMutation(s): 1 
Gene Names: Qki (Qk, Qk1, Qka1)
Find proteins for Q9QYS9 (Mus musculus)
Go to UniProtKB:  Q9QYS9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 33.983α = 90.00
b = 36.024β = 90.00
c = 92.814γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHENIXmodel building
PHENIXrefinement
PHENIXphasing
Blu-Icedata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2012-10-17
    Type: Database references