1X8W

Structure of the Tetrahymena Ribozyme: Base Triple Sandwich and Metal Ion at the Active Site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.267 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the Tetrahymena ribozyme: base triple sandwich and metal ion at the active site.

Guo, F.Gooding, A.R.Cech, T.R.

(2004) Mol Cell 16: 351-362

  • DOI: 10.1016/j.molcel.2004.10.003
  • Primary Citation of Related Structures:  
    1X8W

  • PubMed Abstract: 
  • The Tetrahymena intron is an RNA catalyst, or ribozyme. As part of its self-splicing reaction, this ribozyme catalyzes phosphoryl transfer between guanosine and a substrate RNA strand. Here we report the refined crystal structure of an active Tetrahy ...

    The Tetrahymena intron is an RNA catalyst, or ribozyme. As part of its self-splicing reaction, this ribozyme catalyzes phosphoryl transfer between guanosine and a substrate RNA strand. Here we report the refined crystal structure of an active Tetrahymena ribozyme in the absence of its RNA substrate at 3.8 A resolution. The 3'-terminal guanosine (omegaG), which serves as the attacking group for RNA cleavage, forms a coplanar base triple with the G264-C311 base pair, and this base triple is sandwiched by three other base triples. In addition, a metal ion is present in the active site, contacting or positioned close to the ribose of the omegaG and five phosphates. All of these phosphates have been shown to be important for catalysis. Therefore, we provide a picture of how the ribozyme active site positions both a catalytic metal ion and the nucleophilic guanosine for catalysis prior to binding its RNA substrate.


    Organizational Affiliation

    Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.



Macromolecules
Find similar nucleic acids by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
Tetrahymena ribozyme RNAA, B, C, D247N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.80 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.267 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 175.4α = 90
b = 175.4β = 90
c = 304.8γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-09
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance