Crystal structure analysis of sup35

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 

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This is version 1.3 of the entry. See complete history


Crystal structure and functional analysis of the eukaryotic class II release factor eRF3 from S. pombe

Kong, C.Ito, K.Walsh, M.A.Wada, M.Liu, Y.Kumar, S.Barford, D.Nakamura, Y.Song, H.

(2004) Mol Cell 14: 233-245

  • DOI: https://doi.org/10.1016/s1097-2765(04)00206-0
  • Primary Citation of Related Structures:  
    1R5B, 1R5N, 1R5O

  • PubMed Abstract: 

    Translation termination in eukaryotes is governed by two interacting release factors, eRF1 and eRF3. The crystal structure of the eEF1alpha-like region of eRF3 from S. pombe determined in three states (free protein, GDP-, and GTP-bound forms) reveals an overall structure that is similar to EF-Tu, although with quite different domain arrangements. In contrast to EF-Tu, GDP/GTP binding to eRF3c does not induce dramatic conformational changes, and Mg(2+) is not required for GDP binding to eRF3c. Mg(2+) at higher concentration accelerates GDP release, suggesting a novel mechanism for nucleotide exchange on eRF3 from that of other GTPases. Mapping sequence conservation onto the molecular surface, combined with mutagenesis analysis, identified the eRF1 binding region, and revealed an essential function for the C terminus of eRF3. The N-terminal extension, rich in acidic amino acids, blocks the proposed eRF1 binding site, potentially regulating eRF1 binding to eRF3 in a competitive manner.

  • Organizational Affiliation

    Laboratory of Macromolecular Structure, Institute of Molecular and Cell Biology, 30 Medical Drive, Singapore 117609, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Eukaryotic peptide chain release factor GTP-binding subunit467Schizosaccharomyces pombeMutation(s): 0 
Gene Names: SUP35SPCC584.04
Find proteins for O74718 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore O74718 
Go to UniProtKB:  O74718
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO74718
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.796α = 90
b = 83.796β = 90
c = 165.937γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-05-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references