3Q7C

Exonuclease domain of Lassa virus nucleoprotein bound to manganese


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Lassa virus nucleoprotein reveals a dsRNA-specific 3' to 5' exonuclease activity essential for immune suppression.

Hastie, K.M.Kimberlin, C.R.Zandonatti, M.A.Macrae, I.J.Saphire, E.O.

(2011) Proc.Natl.Acad.Sci.USA 108: 2396-2401

  • DOI: 10.1073/pnas.1016404108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Lassa fever virus, a member of the family Arenaviridae, is a highly endemic category A pathogen that causes 300,000-500,000 infections per year in Western Africa. The arenaviral nucleoprotein NP has been implicated in suppression of the host innate i ...

    Lassa fever virus, a member of the family Arenaviridae, is a highly endemic category A pathogen that causes 300,000-500,000 infections per year in Western Africa. The arenaviral nucleoprotein NP has been implicated in suppression of the host innate immune system, but the mechanism by which this occurs has remained elusive. Here we present the crystal structure at 1.5 Å of the immunosuppressive C-terminal portion of Lassa virus NP and illustrate that, unexpectedly, its 3D fold closely mimics that of the DEDDh family of exonucleases. Accompanying biochemical experiments illustrate that NP indeed has a previously unknown, bona fide exonuclease activity, with strict specificity for double-stranded RNA substrates. We further demonstrate that this exonuclease activity is essential for the ability of NP to suppress translocation of IFN regulatory factor 3 and block activation of the innate immune system. Thus, the nucleoprotein is a viral exonuclease with anti-immune activity, and this work provides a unique opportunity to combat arenaviral infections.


    Organizational Affiliation

    Departments of Immunology and Microbial Science and Molecular Biology, and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nucleoprotein
A
243Lassa virus (strain Mouse/Sierra Leone/Josiah/1976)Mutation(s): 0 
Gene Names: N
EC: 3.1.13.-
Find proteins for P13699 (Lassa virus (strain Mouse/Sierra Leone/Josiah/1976))
Go to UniProtKB:  P13699
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 44.870α = 90.00
b = 67.940β = 90.00
c = 78.680γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing
d*TREKdata reduction
ADSCdata collection
PHENIXmodel building
d*TREKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-02-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-09-07
    Type: Structure summary