The X-ray Crystal Structure of the Human STAU1 SSM-'RBD'5 Domain-Swapped Dimer

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.167 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Staufen1 dimerizes through a conserved motif and a degenerate dsRNA-binding domain to promote mRNA decay.

Gleghorn, M.L.Gong, C.Kielkopf, C.L.Maquat, L.E.

(2013) Nat Struct Mol Biol 20: 515-524

  • DOI: https://doi.org/10.1038/nsmb.2528
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Staufen1 (STAU1)-mediated mRNA decay (SMD) degrades mammalian-cell mRNAs that bind the double-stranded RNA (dsRNA)-binding protein STAU1 in their 3' untranslated region. We report a new motif, which typifies STAU homologs from all vertebrate classes, that is responsible for human STAU1 (hSTAU1) homodimerization. Our crystal structure and mutagenesis analyses reveal that this motif, which we named the Staufen-swapping motif (SSM), and the dsRNA-binding domain 5 ('RBD'5) mediate protein dimerization: the two SSM α-helices of one molecule interact primarily through a hydrophobic patch with the two 'RBD'5 α-helices of a second molecule. 'RBD'5 adopts the canonical α-β-β-β-α fold of a functional RBD, but it lacks residues and features required to bind duplex RNA. In cells, SSM-mediated hSTAU1 dimerization increases the efficiency of SMD by augmenting hSTAU1 binding to the ATP-dependent RNA helicase hUPF1. Dimerization regulates keratinocyte-mediated wound healing and many other cellular processes.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, School of Medicine and Dentistry, University of Rochester, Rochester, New York, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Double-stranded RNA-binding protein Staufen homolog 1115Homo sapiensMutation(s): 0 
Gene Names: STAUSTAU1
UniProt & NIH Common Fund Data Resources
Find proteins for O95793 (Homo sapiens)
Explore O95793 
Go to UniProtKB:  O95793
PHAROS:  O95793
GTEx:  ENSG00000124214 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO95793
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.167 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.741α = 90
b = 45.741β = 90
c = 86.086γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2013-05-22
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2024-03-13
    Changes: Source and taxonomy, Structure summary