1QLN

STRUCTURE OF A TRANSCRIBING T7 RNA POLYMERASE INITIATION COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of a Transcribing T7 RNA Polymerase Initiation Complex

Cheetham, G.M.T.Steitz, T.A.

(1999) Science 286: 2305

  • DOI: 10.1126/science.286.5448.2305
  • Primary Citation of Related Structures:  
    1QLN

  • PubMed Abstract: 
  • The structure of a T7 RNA polymerase (T7 RNAP) initiation complex captured transcribing a trinucleotide of RNA from a 17-base pair promoter DNA containing a 5-nucleotide single-strand template extension was determined at a resolution of 2.4 angstroms. Binding of the upstream duplex portion of the promoter occurs in the same manner as that in the open promoter complex, but the single-stranded template is repositioned to place the +4 base at the catalytic active site ...

    The structure of a T7 RNA polymerase (T7 RNAP) initiation complex captured transcribing a trinucleotide of RNA from a 17-base pair promoter DNA containing a 5-nucleotide single-strand template extension was determined at a resolution of 2.4 angstroms. Binding of the upstream duplex portion of the promoter occurs in the same manner as that in the open promoter complex, but the single-stranded template is repositioned to place the +4 base at the catalytic active site. Thus, synthesis of RNA in the initiation phase leads to accumulation or "scrunching" of the template in the enclosed active site pocket of T7 RNAP. Only three base pairs of heteroduplex are formed before the RNA peels off the template.


    Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry, Yale University, Howard Hughes Medical Institute, New Haven, CT 06520-8114, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BACTERIOPHAGE T7 RNA POLYMERASEA883Escherichia phage T7Mutation(s): 0 
Gene Names: 1
EC: 2.7.7.6
UniProt
Find proteins for P00573 (Escherichia phage T7)
Explore P00573 
Go to UniProtKB:  P00573
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5-D(P*TP*AP*AP*TP*AP*CP*GP*AP*CP*TP*CP*AP*CP*TP*A)-3)B [auth N]17Escherichia phage T7
    Protein Feature View
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    • Reference Sequence
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    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      RNA (5- R(PPP*GP*GP*G)-3)C [auth R]3N/A
      Protein Feature View
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      • Reference Sequence
      Find similar nucleic acids by:  (by identity cutoff)  |  Structure
      Entity ID: 4
      MoleculeChainsLengthOrganismImage
      DNA (5- D (P*CP*TP*CP*CP*CP*TP*AP*TP*AP*GP*TP*GP*AP*GP*TP*CP*GP*TP* AP*TP*TP*A)-3)D [auth T]22Escherichia phage T7
      Protein Feature View
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      • Reference Sequence
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.40 Å
      • R-Value Free: 0.267 
      • R-Value Work: 0.223 
      • R-Value Observed: 0.223 
      • Space Group: P 21 21 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 221.2α = 90
      b = 73.6β = 90
      c = 80.9γ = 90
      Software Package:
      Software NamePurpose
      CNSrefinement
      MOSFLMdata reduction
      SCALAdata scaling

      Structure Validation

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      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2000-02-04
        Type: Initial release
      • Version 1.1: 2011-05-08
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Version format compliance