3DLB

Crystal structure of the guide-strand-containing Argonaute protein silencing complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.254 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the guide-strand-containing argonaute silencing complex.

Wang, Y.Sheng, G.Juranek, S.Tuschl, T.Patel, D.J.

(2008) Nature 456: 209-213

  • DOI: 10.1038/nature07315
  • Primary Citation of Related Structures:  3DLH

  • PubMed Abstract: 
  • The slicer activity of the RNA-induced silencing complex is associated with argonaute, the RNase H-like PIWI domain of which catalyses guide-strand-mediated sequence-specific cleavage of target messenger RNA. Here we report on the crystal structure o ...

    The slicer activity of the RNA-induced silencing complex is associated with argonaute, the RNase H-like PIWI domain of which catalyses guide-strand-mediated sequence-specific cleavage of target messenger RNA. Here we report on the crystal structure of Thermus thermophilus argonaute bound to a 5'-phosphorylated 21-base DNA guide strand, thereby identifying the nucleic-acid-binding channel positioned between the PAZ- and PIWI-containing lobes, as well as the pivot-like conformational changes associated with complex formation. The bound guide strand is anchored at both of its ends, with the solvent-exposed Watson-Crick edges of stacked bases 2 to 6 positioned for nucleation with the mRNA target, whereas two critically positioned arginines lock bases 10 and 11 at the cleavage site into an unanticipated orthogonal alignment. Biochemical studies indicate that key amino acid residues at the active site and those lining the 5'-phosphate-binding pocket made up of the Mid domain are critical for cleavage activity, whereas alterations of residues lining the 2-nucleotide 3'-end-binding pocket made up of the PAZ domain show little effect.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
argonaute
A, B
685Thermus thermophilus (strain HB27 / ATCC BAA-163 / DSM 7039)N/A
Find proteins for Q746M7 (Thermus thermophilus (strain HB27 / ATCC BAA-163 / DSM 7039))
Go to UniProtKB:  Q746M7
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*DTP*DGP*DAP*DGP*DGP*DTP*DAP*DGP*DTP*DA)-3')X,Y10N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.254 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 77.846α = 90.00
b = 123.399β = 95.70
c = 84.910γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data collection
REFMACrefinement
SOLVEphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance