6DGK

Crystal Structure of the Non-Structural Protein 1 (NS1) effector domain W187A mutant from the A/Brevig Mission/1/1918 (H1N1) strain of Influenza A Virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural analyses reveal the mechanism of inhibition of influenza virus NS1 by two antiviral compounds.

Kleinpeter, A.B.Jureka, A.S.Falahat, S.M.Green, T.J.Petit, C.M.

(2018) J. Biol. Chem. 293: 14659-14668

  • DOI: 10.1074/jbc.RA118.004012

  • PubMed Abstract: 
  • The influenza virus is a significant public health concern causing 250,000-500,000 deaths worldwide each year. Its ability to change quickly results in the potential for rapid generation of pandemic strains for which most individuals would have no an ...

    The influenza virus is a significant public health concern causing 250,000-500,000 deaths worldwide each year. Its ability to change quickly results in the potential for rapid generation of pandemic strains for which most individuals would have no antibody protection. This pandemic potential highlights the need for the continuous development of new drugs against influenza virus. As an essential component and well established virulence determinant, NS1 (nonstructural protein 1) of influenza virus is a highly prioritized target for the development of anti-influenza compounds. Here, we used NMR to determine that the NS1 effector domain (NS1 ED ) derived from the A/Brevig Mission/1/1918 (H1N1) strain of influenza (1918 H1N1 ) binds to two previously described anti-influenza compounds A9 (JJ3297) and A22. We then used X-ray crystallography to determine the three-dimensional structure of the 1918 H1N1 NS1 ED Furthermore, we mapped the A9/A22-binding site onto our 1918 H1N1 NS1 ED structure and determined that A9 and A22 interact with the NS1 ED in the hydrophobic pocket known to facilitate binding to the 30-kDa subunit of the cleavage and polyadenylation specificity factor (CPSF30), suggesting that the two compounds likely attenuate influenza replication by inhibiting the NS1 ED -CPSF30 interaction. Finally, our structure revealed that NS1 ED could dimerize via an interface that we termed the α 3 3 dimer. Taken together, the findings presented here provide strong evidence for the mechanism of action of two anti-influenza compounds that target NS1 and contribute significant structural insights into NS1 that we hope will promote and inform the development and optimization of influenza therapies based on A9/A22.


    Organizational Affiliation

    From the Departments of Biochemistry and Molecular Genetics and.,Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294.,From the Departments of Biochemistry and Molecular Genetics and cpetit@uab.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Non-structural protein 1
A, B
120Influenza A virus (strain A/Brevig Mission/1/1918 H1N1)Mutation(s): 1 
Gene Names: NS
Find proteins for Q99AU3 (Influenza A virus (strain A/Brevig Mission/1/1918 H1N1))
Go to UniProtKB:  Q99AU3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.170 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 32.785α = 90.00
b = 69.744β = 90.00
c = 104.975γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited States1R01AI116738
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited States1R01AI134693

Revision History 

  • Version 1.0: 2018-08-15
    Type: Initial release
  • Version 1.1: 2018-10-03
    Type: Data collection, Database references