X-ray crystal structure of the transcription initiation complex of the N4 mini-vRNAP with P2 promoter: Mismatch complex

Experimental Data Snapshot

  • Resolution: 2.69 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

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X-ray crystal structures elucidate the nucleotidyl transfer reaction of transcript initiation using two nucleotides.

Gleghorn, M.L.Davydova, E.K.Basu, R.Rothman-Denes, L.B.Murakami, K.S.

(2011) Proc Natl Acad Sci U S A 108: 3566-3571

  • DOI: https://doi.org/10.1073/pnas.1016691108
  • Primary Citation of Related Structures:  
    3Q0A, 3Q22, 3Q23, 3Q24

  • PubMed Abstract: 

    We have determined the X-ray crystal structures of the pre- and postcatalytic forms of the initiation complex of bacteriophage N4 RNA polymerase that provide the complete set of atomic images depicting the process of transcript initiation by a single-subunit RNA polymerase. As observed during T7 RNA polymerase transcript elongation, substrate loading for the initiation process also drives a conformational change of the O-helix, but only the correct base pairing between the +2 substrate and DNA base is able to complete the O-helix conformational transition. Substrate binding also facilitates catalytic metal binding that leads to alignment of the reactive groups of substrates for the nucleotidyl transfer reaction. Although all nucleic acid polymerases use two divalent metals for catalysis, they differ in the requirements and the timing of binding of each metal. In the case of bacteriophage RNA polymerase, we propose that catalytic metal binding is the last step before the nucleotidyl transfer reaction.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, USA.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Virion RNA polymeraseA,
C [auth B]
1,118Enquatrovirus N4Mutation(s): 0 
Gene Names: gp5050
Find proteins for Q859P9 (Enterobacteria phage N4)
Explore Q859P9 
Go to UniProtKB:  Q859P9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ859P9
Sequence Annotations
  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains LengthOrganismImage
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.69 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.346α = 90
b = 111.379β = 90
c = 275.495γ = 90
Software Package:
Software NamePurpose
Adxvdata processing
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description