4MIW

High-resolution structure of the N-terminal endonuclease domain of the Lassa virus L polymerase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.165 

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Literature

High-resolution structure of the N-terminal endonuclease domain of the lassa virus L polymerase in complex with magnesium ions.

Wallat, G.D.Huang, Q.Wang, W.Dong, H.Ly, H.Liang, Y.Dong, C.

(2014) Plos One 9: e87577-e87577

  • DOI: 10.1371/journal.pone.0087577

  • PubMed Abstract: 
  • Lassa virus (LASV) causes deadly hemorrhagic fever disease for which there are no vaccines and limited treatments. LASV-encoded L polymerase is required for viral RNA replication and transcription. The functional domains of L-a large protein of 2218 ...

    Lassa virus (LASV) causes deadly hemorrhagic fever disease for which there are no vaccines and limited treatments. LASV-encoded L polymerase is required for viral RNA replication and transcription. The functional domains of L-a large protein of 2218 amino acid residues-are largely undefined, except for the centrally located RNA-dependent RNA polymerase (RdRP) motif. Recent structural and functional analyses of the N-terminal region of the L protein from lymphocytic choriomeningitis virus (LCMV), which is in the same Arenaviridae family as LASV, have identified an endonuclease domain that presumably cleaves the cap structures of host mRNAs in order to initiate viral transcription. Here we present a high-resolution crystal structure of the N-terminal 173-aa region of the LASV L protein (LASV L173) in complex with magnesium ions at 1.72 Å. The structure is highly homologous to other known viral endonucleases of arena- (LCMV NL1), orthomyxo- (influenza virus PA), and bunyaviruses (La Crosse virus NL1). Although the catalytic residues (D89, E102 and K122) are highly conserved among the known viral endonucleases, LASV L endonuclease structure shows some notable differences. Our data collected from in vitro endonuclease assays and a reporter-based LASV minigenome transcriptional assay in mammalian cells confirm structural prediction of LASV L173 as an active endonuclease. The high-resolution structure of the LASV L endonuclease domain in complex with magnesium ions should aid the development of antivirals against lethal Lassa hemorrhagic fever.


    Organizational Affiliation

    Biomedical Science Research Complex, School of Chemistry, University of St. Andrews, Fife, St. Andrews, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RNA-directed RNA polymerase L
A
178Lassa mammarenavirusEC: 2.7.7.48
Find proteins for Q6GWS2 (Lassa mammarenavirus)
Go to UniProtKB:  Q6GWS2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.165 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 57.720α = 90.00
b = 57.720β = 90.00
c = 134.510γ = 90.00
Software Package:
Software NamePurpose
DNAdata collection
PHENIXrefinement
SCALAdata scaling
PHASESphasing
MOSFLMdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-19
    Type: Initial release