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
  • Structures With Same Primary Citation

  • 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 ...

    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 LengthOrganismDetails
BACTERIOPHAGE T7 RNA POLYMERASEA883Escherichia phage T7Mutation(s): 0 
Gene Names: 1
EC: 2.7.7.6
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: 3
MoleculeChainsLengthOrganism
RNA (5- R(PPP*GP*GP*G)-3)R3N/A
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Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5-D(P*TP*AP*AP*TP*AP*CP*GP*AP*CP*TP*CP*AP*CP*TP*A)-3)N17Escherichia phage T7

Find similar nucleic acids by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsLengthOrganism
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)T22Escherichia phage T7
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 

  • 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