2PO1

Crystal structure of the P. abyssi exosome RNase PH ring complexed with a single stranded 10-mer poly(A) RNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Insights into the mechanism of progressive RNA degradation by the archaeal exosome.

Navarro, M.V.A.S., Oliveira, C.C., Zanchin, N.I., Guimaraes, B.G.

(2008) J Biol Chem 283: 14120-14131

  • DOI: 10.1074/jbc.M801005200
  • Primary Citation of Related Structures:  
    2PO0, 2PO2, 2PO1, 2PNZ

  • PubMed Abstract: 

    • Initially identified in yeast, the exosome has emerged as a central component of the RNA maturation and degradation machinery both in Archaea and eukaryotes. Here we describe a series of high-resolution structures of the RNase PH ring from the Pyrococcus abyssi exosome, one of them containing three 10-mer RNA strands within the exosome catalytic chamber, and report additional nucleotide interactions involving positions N5 and N7 ...

    Initially identified in yeast, the exosome has emerged as a central component of the RNA maturation and degradation machinery both in Archaea and eukaryotes. Here we describe a series of high-resolution structures of the RNase PH ring from the Pyrococcus abyssi exosome, one of them containing three 10-mer RNA strands within the exosome catalytic chamber, and report additional nucleotide interactions involving positions N5 and N7. Residues from all three Rrp41-Rrp42 heterodimers interact with a single RNA molecule, providing evidence for the functional relevance of exosome ring-like assembly in RNA processivity. Furthermore, an ADP-bound structure showed a rearrangement of nucleotide interactions at site N1, suggesting a rationale for the elimination of nucleoside diphosphate after catalysis. In combination with RNA degradation assays performed with mutants of key amino acid residues, the structural data presented here provide support for a model of exosome-mediated RNA degradation that integrates the events involving catalytic cleavage, product elimination, and RNA translocation. Finally, comparisons between the archaeal and human exosome structures provide a possible explanation for the eukaryotic exosome inability to catalyze phosphate-dependent RNA degradation.

    Organizational Affiliation: 

    Brazilian Synchrotron Light Laboratory, 13083-970 Campinas, SP, Brazil. mn372@cornell.edu



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Probable exosome complex exonuclease 1B [auth A]249Pyrococcus abyssiMutation(s): 0 
Gene Names: rrp41
EC: 3.1.13
Find proteins for Q9V119 (Pyrococcus abyssi (strain GE5 / Orsay))
Explore Q9V119 
Go to UniProtKB:  Q9V119
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Probable exosome complex exonuclease 2C [auth B]277Pyrococcus abyssiMutation(s): 0 
Gene Names: rrp42
EC: 3.1.13
Find proteins for Q9V118 (Pyrococcus abyssi (strain GE5 / Orsay))
Explore Q9V118 
Go to UniProtKB:  Q9V118
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    10-mer poly(A)A [auth C]10N/A
    Small Molecules
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 1.94 Å
    • R-Value Free: 0.242 
    • R-Value Work: 0.187 
    • R-Value Observed: 0.190 
    • Space Group: P 3 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 93.555α = 90
    b = 93.555β = 90
    c = 125.951γ = 120
    Software Package:
    Software NamePurpose
    REFMACrefinement
    MAR345dtbdata collection
    XDSdata reduction
    XDSdata scaling
    MOLREPphasing

    Structure Validation

    View Full Validation Report


    View more in-depth experimental data

    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2008-03-18
      Type: Initial release
    • Version 1.1: 2011-07-13
      Changes: Version format compliance