C-terminal domain of elongation factor selB complexed with SECIS RNA

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.224 

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This is version 1.3 of the entry. See complete history


Structural basis for mRNA recognition by elongation factor SelB

Yoshizawa, S.Rasubala, L.Ose, T.Kohda, D.Fourmy, D.Maenaka, K.

(2005) Nat Struct Mol Biol 12: 198-203

  • DOI: https://doi.org/10.1038/nsmb890
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In bacteria, incorporation of selenocysteine, the 21(st) amino acid, into proteins requires elongation factor SelB, which has the unusual property of binding to both transfer RNA (tRNA) and mRNA. SelB binds to an mRNA hairpin formed by the selenocysteine insertion sequence (SECIS) with extremely high specificity, the molecular basis of which has been unknown. We have determined the crystal structure of the mRNA-binding domain of SelB in complex with SECIS RNA at a resolution of 2.3 A. This is the first example of a complex between an RNA and a winged-helix (WH) domain, a motif found in many DNA-binding proteins and recently discovered in RNA-binding proteins. Notably, RNA binding does not induce a major conformational change in the WH motif. The structure reveals a new mode of RNA recognition with a geometry that allows the complex to wrap around the small ribosomal subunit.

  • Organizational Affiliation

    Laboratoire de RMN, Institut de Chimie des Substances Naturelles, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, 91190 Gif-sur-Yvette, France. yoshizawa@icsn.cnrs-gif.fr


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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Selenocysteine-specific elongation factorD [auth A],
E [auth B],
F [auth C],
G [auth D]
124Moorella thermoaceticaMutation(s): 0 
Gene Names: selB
Find proteins for Q46455 (Moorella thermoacetica)
Explore Q46455 
Go to UniProtKB:  Q46455
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ46455
Sequence Annotations
  • Reference Sequence

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Entity ID: 1
MoleculeChains LengthOrganismImage
B [auth F],
C [auth G]
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.224 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.865α = 90
b = 169.814β = 90
c = 71.827γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Refinement description