MS2 (N87AE89K mutant) - Qbeta RNA hairpin complex

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural Basis of RNA Binding Discrimination between Bacteriophages Qbeta and MS2.

Horn, W.T.Tars, K.Grahn, E.Helgstrand, C.Baron, A.J.Lago, H.Adams, C.J.Peabody, D.S.Phillips, S.E.V.Stonehouse, N.J.Liljas, L.Stockley, P.G.

(2006) Structure 14: 487

  • DOI: https://doi.org/10.1016/j.str.2005.12.006
  • Primary Citation of Related Structures:  
    1ZSE, 2B2D, 2B2E, 2B2G, 2BNY, 2BQ5, 2BS0, 2BS1

  • PubMed Abstract: 

    Sequence-specific interactions between RNA stem-loops and coat protein (CP) subunits play vital roles in the life cycles of the RNA bacteriophages, e.g., by allowing translational repression of their replicase cistrons and tagging their own RNA genomes for encapsidation. The CPs of bacteriophages Qbeta and MS2 each discriminate in favor of their cognate translational operators, even in the presence of closely related operators from other phages in vivo. Discrete mutations within the MS2 CP have been shown to relax this discrimination in vitro. We have determined the structures of eight complexes between such mutants and both MS2 and Qbeta stem-loops with X-ray crystallography. In conjunction with previously determined in vivo repression data, the structures enable us to propose the molecular basis for the discrimination mechanism.

  • Organizational Affiliation

    Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, United Kingdom.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
129Escherichia phage MS2Mutation(s): 2 
Find proteins for P03612 (Escherichia phage MS2)
Explore P03612 
Go to UniProtKB:  P03612
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03612
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
E [auth S]
20Escherichia phage MS2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 273.1α = 63.26
b = 273.5β = 63.11
c = 273.4γ = 63.31
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-22
    Type: Initial release
  • Version 1.1: 2012-01-11
    Changes: Other, Refinement description, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description