2AZ0 image
Entry Detail
PDB ID:
2AZ0
Title:
Flock House virus B2-dsRNA Complex (P212121)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-09-09
Release Date:
2005-10-11
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.26
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:B2 protein
Chain IDs:C (auth: A), D (auth: B)
Chain Length:73
Number of Molecules:2
Biological Source:Flock house virus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
5BU A U 5-BROMO-URIDINE-5'-MONOPHOSPHATE
Primary Citation
Dual modes of RNA-silencing suppression by Flock House virus protein B2.
Nat.Struct.Mol.Biol. 12 952 957 (2005)
PMID: 16228003 DOI: 10.1038/nsmb1005

Abstact

As a counter-defense against antiviral RNA silencing during infection, the insect Flock House virus (FHV) expresses the silencing suppressor protein B2. Biochemical experiments show that B2 binds to double-stranded RNA (dsRNA) without regard to length and inhibits cleavage of dsRNA by Dicer in vitro. A cocrystal structure reveals that a B2 dimer forms a four-helix bundle that binds to one face of an A-form RNA duplex independently of sequence. These results suggest that B2 blocks both cleavage of the FHV genome by Dicer and incorporation of FHV small interfering RNAs into the RNA-induced silencing complex.

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Primary Citation of related structures