2IX0

RNase II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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This is version 1.4 of the entry. See complete history


Literature

Unravelling the Dynamics of RNA Degradation by Ribonuclease II and its RNA-Bound Complex

Frazao, C.Mcvey, C.E.Amblar, M.Barbas, A.Vonrhein, C.Arraiano, C.M.Carrondo, M.A.

(2006) Nature 7: 443

  • DOI: https://doi.org/10.1038/nature05080
  • Primary Citation of Related Structures:  
    2IX0, 2IX1

  • PubMed Abstract: 

    RNA degradation is a determining factor in the control of gene expression. The maturation, turnover and quality control of RNA is performed by many different classes of ribonucleases. Ribonuclease II (RNase II) is a major exoribonuclease that intervenes in all of these fundamental processes; it can act independently or as a component of the exosome, an essential RNA-degrading multiprotein complex. RNase II-like enzymes are found in all three kingdoms of life, but there are no structural data for any of the proteins of this family. Here we report the X-ray crystallographic structures of both the ligand-free (at 2.44 A resolution) and RNA-bound (at 2.74 A resolution) forms of Escherichia coli RNase II. In contrast to sequence predictions, the structures show that RNase II is organized into four domains: two cold-shock domains, one RNB catalytic domain, which has an unprecedented alphabeta-fold, and one S1 domain. The enzyme establishes contacts with RNA in two distinct regions, the 'anchor' and the 'catalytic' regions, which act synergistically to provide catalysis. The active site is buried within the RNB catalytic domain, in a pocket formed by four conserved sequence motifs. The structure shows that the catalytic pocket is only accessible to single-stranded RNA, and explains the specificity for RNA versus DNA cleavage. It also explains the dynamic mechanism of RNA degradation by providing the structural basis for RNA translocation and enzyme processivity. We propose a reaction mechanism for exonucleolytic RNA degradation involving key conserved residues. Our three-dimensional model corroborates all existing biochemical data for RNase II, and elucidates the general basis for RNA degradation. Moreover, it reveals important structural features that can be extrapolated to other members of this family.


  • Organizational Affiliation

    Division of Biological Chemistry, ITQB-Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Apt. 127, 2781-901 Oeiras, Portugal.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EXORIBONUCLEASE 2663Escherichia coliMutation(s): 0 
EC: 3.1.13.1
UniProt
Find proteins for P30850 (Escherichia coli (strain K12))
Explore P30850 
Go to UniProtKB:  P30850
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP30850
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.836α = 90
b = 125.719β = 111.91
c = 66.244γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-03-06
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.4: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description