4G9Z

Lassa nucleoprotein with dsRNA reveals novel mechanism for immune suppression


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of Arenaviral Nucleoproteins with Triphosphate dsRNA Reveal a Unique Mechanism of Immune Suppression.

Jiang, X.Huang, Q.Wang, W.Dong, H.Ly, H.Liang, Y.Dong, C.

(2013) J.Biol.Chem. 288: 16949-16959

  • DOI: 10.1074/jbc.M112.420521
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A hallmark of severe Lassa fever is the generalized immune suppression, the mechanism of which is poorly understood. Lassa virus (LASV) nucleoprotein (NP) is the only known 3'-5' exoribonuclease that can suppress type I interferon (IFN) production po ...

    A hallmark of severe Lassa fever is the generalized immune suppression, the mechanism of which is poorly understood. Lassa virus (LASV) nucleoprotein (NP) is the only known 3'-5' exoribonuclease that can suppress type I interferon (IFN) production possibly by degrading immune-stimulatory RNAs. How this unique enzymatic activity of LASV NP recognizes and processes RNA substrates is unknown. We provide an atomic view of a catalytically active exoribonuclease domain of LASV NP (LASV NP-C) in the process of degrading a 5' triphosphate double-stranded (ds) RNA substrate, a typical pathogen-associated molecular pattern molecule, to induce type I IFN production. Additionally, we provide for the first time a high-resolution crystal structure of an active exoribonuclease domain of Tacaribe arenavirus (TCRV) NP. Coupled with the in vitro enzymatic and cell-based interferon suppression assays, these structural analyses strongly support a unified model of an exoribonuclease-dependent IFN suppression mechanism shared by all known arenaviruses. New knowledge learned from these studies should aid the development of therapeutics against pathogenic arenaviruses that can infect hundreds of thousands of individuals and kill thousands annually.


    Organizational Affiliation

    Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Nucleoprotein
A
213Lassa 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
Entity ID: 1
MoleculeChainsLengthOrganism
RNA (5'-R(P*GP*CP*CP*C)-3')E4N/A
Entity ID: 2
MoleculeChainsLengthOrganism
RNA (5'-R(P*GP*GP*GP*C)-3')F4N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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: 2.03 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.203 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 46.744α = 90.00
b = 46.744β = 90.00
c = 217.315γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PHASERphasing
iMOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-03
    Type: Initial release
  • Version 1.1: 2013-05-15
    Type: Database references
  • Version 1.2: 2013-07-24
    Type: Database references