3FS0

Class II ligase ribozyme product-template duplex, structure 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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This is version 1.1 of the entry. See complete history


Literature

Structure-guided engineering of the regioselectivity of RNA ligase ribozymes.

Pitt, J.N.Ferre-D'Amare, A.R.

(2009) J Am Chem Soc 131: 3532-3540

  • DOI: 10.1021/ja8067325
  • Primary Citation of Related Structures:  
    3FS0, 3FTM

  • PubMed Abstract: 
  • Ribozyme-catalyzed RNA synthesis is central to the RNA world hypothesis. No natural RNA polymerase ribozymes have been discovered. However, ribozymes that catalyze the requisite chemistry, generating a new phosphodiester through attack of a terminal hydroxyl of an RNA on the alpha-phosphate of a triphosphate-activated oligonucleotide, have been isolated by in vitro selection ...

    Ribozyme-catalyzed RNA synthesis is central to the RNA world hypothesis. No natural RNA polymerase ribozymes have been discovered. However, ribozymes that catalyze the requisite chemistry, generating a new phosphodiester through attack of a terminal hydroxyl of an RNA on the alpha-phosphate of a triphosphate-activated oligonucleotide, have been isolated by in vitro selection. These experiments often yield ribozymes that generate 2'-5' phosphodiesters rather than conventional 3'-5' linkages. We have determined crystal structures of the duplex formed by the template segment of a representative 2'-5' RNA ligase ribozyme, the class II ligase, and its ligation product. The structures reveal a product-template duplex with a G x A pair at the ligation junction. This sheared pair is flanked on one side by a minor groove-broadening wedge comprised of two unpaired nucleotides. The reported structure of an independently isolated 3'-5' ligase ribozyme, the L1 ligase, shows a product-template duplex that shares the G x A pair with the class II ligase. However, this G x A pair is flanked by G x U wobbles, rather than an unpaired wedge. We demonstrate that these structural differences of the substrate-template duplexes are largely responsible for the divergent regioselectivity of the two ribozymes, independent of their catalytic moieties, by constructing chimeras. The L1 ligase with a class II substrate-template duplex shows a 30-fold increase in 2'-5' bond synthesis, while the class II ligase with an L1 substrate-template duplex produces 3'-5' bonds exclusively. These results demonstrate how local geometry inherent to the substrate-template duplexes controls the regioselectivity of ribozyme-catalyzed RNA ligation reactions.


    Organizational Affiliation

    Molecular and Cellular Biology Program, University of Washington, Seattle, Washington 98195, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-R(*GP*GP*UP*GP*AP*GP*GP*CP*UP*G)-3'A 10N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-R(*CP*CP*AP*GP*UP*CP*GP*GP*AP*AP*C)-3'B 11N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 30.04α = 90
b = 30.04β = 90
c = 59.666γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
EPMRphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance