1QLN

STRUCTURE OF A TRANSCRIBING T7 RNA POLYMERASE INITIATION COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.267 
  • R-Value Work: 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


  • 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

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BACTERIOPHAGE T7 RNA POLYMERASE
A
883Enterobacteria phage T7
Find proteins for P00573 (Enterobacteria phage T7)
Go to UniProtKB:  P00573
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5-D(P*TP*AP*AP*TP*AP*CP*GP*AP*CP*TP*CP*AP*CP*TP*A)-3)N17Enterobacteria phage T7
Entity ID: 3
MoleculeChainsLengthOrganism
RNA (5- R(PPP*GP*GP*G)-3)R3N/A
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)T22Enterobacteria phage T7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
GTP
Query on GTP
R
NON-POLYMERC10 H16 N5 O14 P3G
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.223 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 221.200α = 90.00
b = 73.600β = 90.00
c = 80.900γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CNSrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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