1CKM

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.218 
  • R-Value Observed: 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

  • DOI: 10.1016/s0092-8674(00)80236-6
  • Primary Citation of Related Structures:  
    1CKN, 1CKM

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MRNA CAPPING ENZYMEAB330Paramecium bursaria Chlorella virus 1Mutation(s): 0 
Gene Names: A103R
EC: 2.7.7.50
Find proteins for Q84424 (Paramecium bursaria Chlorella virus 1)
Explore Q84424 
Go to UniProtKB:  Q84424
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

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: 2.50 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.332α = 90
b = 214.931β = 90
c = 105.752γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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