Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


The structure of human SFPQ reveals a coiled-coil mediated polymer essential for functional aggregation in gene regulation.

Lee, M.Sadowska, A.Bekere, I.Ho, D.Gully, B.S.Lu, Y.Iyer, K.S.Trewhella, J.Fox, A.H.Bond, C.S.

(2015) Nucleic Acids Res 43: 3826-3840

  • DOI: https://doi.org/10.1093/nar/gkv156
  • Primary Citation of Related Structures:  
    4WII, 4WIJ, 4WIK

  • PubMed Abstract: 

    SFPQ, (a.k.a. PSF), is a human tumor suppressor protein that regulates many important functions in the cell nucleus including coordination of long non-coding RNA molecules into nuclear bodies. Here we describe the first crystal structures of Splicing Factor Proline and Glutamine Rich (SFPQ), revealing structural similarity to the related PSPC1/NONO heterodimer and a strikingly extended structure (over 265 Å long) formed by an unusual anti-parallel coiled-coil that results in an infinite linear polymer of SFPQ dimers within the crystals. Small-angle X-ray scattering and transmission electron microscopy experiments show that polymerization is reversible in solution and can be templated by DNA. We demonstrate that the ability to polymerize is essential for the cellular functions of SFPQ: disruptive mutation of the coiled-coil interaction motif results in SFPQ mislocalization, reduced formation of nuclear bodies, abrogated molecular interactions and deficient transcriptional regulation. The coiled-coil interaction motif thus provides a molecular explanation for the functional aggregation of SFPQ that directs its role in regulating many aspects of cellular nucleic acid metabolism.

  • Organizational Affiliation

    School of Chemistry and Biochemistry, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Splicing factor, proline- and glutamine-rich
A, B
234Homo sapiensMutation(s): 0 
Gene Names: SFPQPSF
UniProt & NIH Common Fund Data Resources
Find proteins for P23246 (Homo sapiens)
Explore P23246 
Go to UniProtKB:  P23246
PHAROS:  P23246
GTEx:  ENSG00000116560 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23246
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.399α = 90
b = 180.416β = 90
c = 57.029γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia513880
National Health and Medical Research Council (NHMRC, Australia)Australia1048659
National Health and Medical Research Council (NHMRC, Australia)Australia1050585
National Health and Medical Research Council (NHMRC, Australia)Australia513935

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-01
    Type: Initial release
  • Version 1.1: 2015-04-29
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Advisory, Author supporting evidence, Data collection, Database references, Derived calculations, Other, Source and taxonomy
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.4: 2023-12-27
    Changes: Advisory, Data collection, Database references, Refinement description