2CWO

Crystal structure of RNA silencing suppressor p21 from Beet Yellows Virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 

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This is version 1.2 of the entry. See complete history


Literature

RNA Silencing Suppressor p21 of Beet Yellows Virus Forms an RNA Binding Octameric Ring Structure

Ye, K.Patel, D.J.

(2005) Structure 13: 1375-1384

  • DOI: 10.1016/j.str.2005.06.017
  • Primary Citation of Related Structures:  
    2CWO

  • PubMed Abstract: 
  • Many plant viruses encode proteins that suppress the antiviral RNA silencing response mounted by the host. The suppressors p19 from tombusvirus and p21 from Beet yellows virus appear to block silencing by directly binding siRNA, a critical mediator in the process ...

    Many plant viruses encode proteins that suppress the antiviral RNA silencing response mounted by the host. The suppressors p19 from tombusvirus and p21 from Beet yellows virus appear to block silencing by directly binding siRNA, a critical mediator in the process. Here, we report the crystal structure of p21, which reveals an octameric ring architecture with a large central cavity of approximately 90 A diameter. The all alpha-helical p21 monomer consists of N- and C-terminal domains that associate with their neighboring counterparts through symmetric head-to-head and tail-to-tail interactions. A putative RNA binding surface is identified in the conserved, positive-charged inner surface of the ring. In contrast to the specific p19-siRNA duplex interaction, p21 is a general nucleic acid binding protein, interacting with 21 nt or longer single- and double-stranded RNAs in vitro. This study reveals an RNA binding structure adopted by the p21 silencing suppressor.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10021, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RNA silencing suppressor ABCD197Beet yellows virusMutation(s): 0 
Gene Names: p21
Find proteins for Q08545 (Beet yellows virus (isolate Ukraine))
Explore Q08545 
Go to UniProtKB:  Q08545
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 199.633α = 90
b = 199.633β = 90
c = 56.122γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2005-06-22 
  • Released Date: 2005-10-11 
  • Deposition Author(s): Ye, K., Patel, D.J.

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-11
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance