1CKM

STRUCTURE OF TWO DIFFERENT CONFORMATIONS OF MRNA CAPPING ENZYME IN COMPLEX WITH GTP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray crystallography reveals a large conformational change during guanyl transfer by mRNA capping enzymes.

Hakansson, K.Doherty, A.J.Shuman, S.Wigley, D.B.

(1997) Cell 89: 545-553

  • Primary Citation of Related Structures:  1CKN

  • PubMed Abstract: 
  • We have solved the crystal structure of an mRNA capping enzyme at 2.5 A resolution. The enzyme comprises two domains with a deep, but narrow, cleft between them. The two molecules in the crystallographic asymmetric unit adopt very different conformat ...

    We have solved the crystal structure of an mRNA capping enzyme at 2.5 A resolution. The enzyme comprises two domains with a deep, but narrow, cleft between them. The two molecules in the crystallographic asymmetric unit adopt very different conformations; both contain a bound GTP, but one protein molecule is in an open conformation while the other is in a closed conformation. Only in the closed conformation is the enzyme able to bind manganese ions and undergo catalysis within the crystals to yield the covalent guanylated enzyme intermediate. These structures provide direct evidence for a mechanism that involves a significant conformational change in the enzyme during catalysis.


    Related Citations: 
    • Crystallization of the RNA Guanylyltransferase of Chlorella Virus Pbcv-1 Change During Guanyl Transfer by Mrna Capping Enzymes
      Doherty, A.J.,Hakansson, K.,Ho, C.K.,Shuman, S.,Wigley, D.B.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Laboratory of Molecular Biophysics, University of Oxford, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MRNA CAPPING ENZYME
A, B
330Paramecium bursaria Chlorella virus 1EC: 2.7.7.50
Find proteins for Q84424 (Paramecium bursaria Chlorella virus 1)
Go to UniProtKB:  Q84424
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download SDF File 
Download CCD File 
A, B
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.218 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 93.332α = 90.00
b = 214.931β = 90.00
c = 105.752γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
SCALEPACKdata scaling
DENZOdata reduction
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-07-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance