1RPU

Crystal Structure of CIRV p19 bound to siRNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.240 

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This is version 1.3 of the entry. See complete history. 


Literature

Size selective recognition of siRNA by an RNA silencing suppressor

Vargason, J.M., Szittya, G., Burgyan, J., Hall, T.M.T.

(2003) Cell 115: 799-811

  • DOI: 10.1016/s0092-8674(03)00984-x
  • Primary Citation of Related Structures:  
    1RPU

  • PubMed Abstract: 

    • RNA silencing in plants likely exists as a defense mechanism against molecular parasites such as RNA viruses, retrotransposons, and transgenes. As a result, many plant viruses have adapted mechanisms to evade and suppress gene silencing. Tombusviruses express a 19 kDa protein (p19), which has been shown to suppress RNA silencing in vivo and bind silencing-generated and synthetic small interfering RNAs (siRNAs) in vitro ...

    RNA silencing in plants likely exists as a defense mechanism against molecular parasites such as RNA viruses, retrotransposons, and transgenes. As a result, many plant viruses have adapted mechanisms to evade and suppress gene silencing. Tombusviruses express a 19 kDa protein (p19), which has been shown to suppress RNA silencing in vivo and bind silencing-generated and synthetic small interfering RNAs (siRNAs) in vitro. Here we report the 2.5 A crystal structure of p19 from the Carnation Italian ringspot virus (CIRV) bound to a 21 nt siRNA and demonstrate in biochemical and in vivo assays that CIRV p19 protein acts as a molecular caliper to specifically select siRNAs based on the length of the duplex region of the RNA.

    Organizational Affiliation: 

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
19 kDa proteinC [auth A],
D [auth B]		172Carnation Italian ringspot virusMutation(s): 0 
Gene Names: p19, ORF4
UniProt
Find proteins for Q66104 (Carnation Italian ringspot virus)
Explore Q66104 
Go to UniProtKB:  Q66104
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ66104
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-R(P*CP*GP*UP*AP*CP*GP*CP*GP*UP*CP*AP*CP*GP*CP*GP*UP*AP*CP*GP*UP*U)-3'A [auth C],
B [auth D]		21N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.240 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.4α = 90
b = 115.4β = 90
c = 128.2γ = 120
Software Package:
Software NamePurpose
MAR345data collection
SCALEPACKdata scaling
SHARPphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-13
    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: 2017-10-11
    Changes: Refinement description