Crystal structure of RNase III Mutant E110K from Aquifex Aeolicus complexed with ds-RNA at 2.15 Angstrom Resolution

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

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Noncatalytic Assembly of Ribonuclease III with Double-Stranded RNA.

Blaszczyk, J.Gan, J.Tropea, J.E.Court, D.L.Waugh, D.S.Ji, X.

(2004) Structure 12: 457-466

  • DOI: https://doi.org/10.1016/j.str.2004.02.004
  • Primary Citation of Related Structures:  
    1RC5, 1RC7

  • PubMed Abstract: 

    Ribonuclease III (RNase III) represents a family of double-stranded RNA (dsRNA) endonucleases. The simplest bacterial enzyme contains an endonuclease domain (endoND) and a dsRNA binding domain (dsRBD). RNase III can affect RNA structure and gene expression in either of two ways: as a dsRNA-processing enzyme that cleaves dsRNA, or as a dsRNA binding protein that binds but does not cleave dsRNA. We previously determined the endoND structure of Aquifex aeolicus RNase III (Aa-RNase III) and modeled a catalytic complex of full-length Aa-RNase III with dsRNA. Here, we present the crystal structure of Aa-RNase III in complex with dsRNA, revealing a noncatalytic assembly. The major differences between the two functional forms of RNase III.dsRNA are the conformation of the protein and the orientation and location of dsRNA. The flexibility of a 7 residue linker between the endoND and dsRBD enables the transition between these two forms.

  • Organizational Affiliation

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


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease IIIE [auth A]220Aquifex aeolicusMutation(s): 1 
Gene Names: RNCAQ_946
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
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
5'-R(*GP*GP*CP*GP*CP*GP*CP*GP*CP*C)-3'A [auth B],
B [auth C],
C [auth D],
D [auth E]
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on TRS

Download Ideal Coordinates CCD File 
C4 H12 N O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.286α = 90
b = 118.142β = 90
c = 106.665γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-30
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    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