2EZ6

Crystal structure of Aquifex aeolicus RNase III (D44N) complexed with product of double-stranded RNA processing


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

Starting Models: experimental
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This is version 1.5 of the entry. See complete history


Literature

Structural Insight into the Mechanism of Double-Stranded RNA Processing by Ribonuclease III.

Gan, J.Tropea, J.E.Austin, B.P.Court, D.L.Waugh, D.S.Ji, X.

(2006) Cell 124: 355-366

  • DOI: https://doi.org/10.1016/j.cell.2005.11.034
  • Primary Citation of Related Structures:  
    2EZ6

  • PubMed Abstract: 

    Members of the ribonuclease III (RNase III) family are double-stranded RNA (dsRNA) specific endoribonucleases characterized by a signature motif in their active centers and a two-base 3' overhang in their products. While Dicer, which produces small interfering RNAs, is currently the focus of intense interest, the structurally simpler bacterial RNase III serves as a paradigm for the entire family. Here, we present the crystal structure of an RNase III-product complex, the first catalytic complex observed for the family. A 7 residue linker within the protein facilitates induced fit in protein-RNA recognition. A pattern of protein-RNA interactions, defined by four RNA binding motifs in RNase III and three protein-interacting boxes in dsRNA, is responsible for substrate specificity, while conserved amino acid residues and divalent cations are responsible for scissile-bond cleavage. The structure reveals a wealth of information about the mechanism of RNA hydrolysis that can be extrapolated to other RNase III family members.


  • Organizational Affiliation

    Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD 21702, USA.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease IIIC [auth A],
D [auth B]
221Aquifex aeolicusMutation(s): 1 
Gene Names: rnc
EC: 3.1.26.3
UniProt
Find proteins for O67082 (Aquifex aeolicus (strain VF5))
Explore O67082 
Go to UniProtKB:  O67082
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67082
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains LengthOrganismImage
28-MERA [auth C],
B [auth D]
28N/A
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.839α = 90
b = 50.976β = 104.47
c = 113.746γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-02-07
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description
  • Version 1.5: 2023-08-30
    Changes: Database references, Structure summary