The structural basis for RNA specificity and Ca2 inhibition of an RNA-dependent RNA polymerase phi6p2 with 5nt RNA. Conformation B

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.281 
  • R-Value Observed: 0.281 

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The structural basis for RNA specificity and Ca2+ inhibition of an RNA-dependent RNA polymerase.

Salgado, P.S.Makeyev, E.V.Butcher, S.J.Bamford, D.H.Stuart, D.I.Grimes, J.M.

(2004) Structure 12: 307-316

  • DOI: https://doi.org/10.1016/j.str.2004.01.012
  • Primary Citation of Related Structures:  
    1UVI, 1UVJ, 1UVK, 1UVL, 1UVM, 1UVN

  • PubMed Abstract: 

    The RNA-dependent RNA polymerase of bacteriophage phi6 transcribes mRNA from the three segments of the dsRNA viral genome. We have cocrystallized RNA oligonucleotides with the polymerase, revealing the mode of binding of RNA templates. This binding is somewhat different from that previously seen for DNA oligomers, leading to additional RNA-protein hydrogen bonds, consistent with a preference for RNA. Activation of the RNA/polymerase complex by the addition of substrate and Mg2+ initiates a single round of reaction within the crystal to form a dead-end complex that partially collapses within the enzyme active site. By replacing Mg2+ with Ca2+, we have been able to capture the inhibited complex which shows distortion that explains the structural basis for the inhibition of such polymerases by Ca2+.

  • Organizational Affiliation

    Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford, OX3 7BN, UK.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA-directed RNA polymerase
A, C, E
664Cystovirus phi6Mutation(s): 0 
Gene Names: P2
Find proteins for P11124 (Pseudomonas phage phi6)
Explore P11124 
Go to UniProtKB:  P11124
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11124
Sequence Annotations
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
B, D, F
5synthetic construct
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.281 
  • R-Value Observed: 0.281 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.946α = 90
b = 91.881β = 101.56
c = 140.762γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-26
    Type: Initial release
  • Version 1.1: 2012-02-01
    Changes: Advisory, Derived calculations, Other, Refinement description, Structure summary, Version format compliance
  • Version 1.2: 2018-03-07
    Changes: Advisory, Database references, Source and taxonomy, Structure summary
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description