5WCO

Matrix Protein (M1) of Infectious Salmon Anaemia Virus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.604 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of an orthomyxovirus matrix protein reveals mechanisms for self-polymerization and membrane association.

Zhang, W.Zheng, W.Toh, Y.Betancourt-Solis, M.A.Tu, J.Fan, Y.Vakharia, V.N.Liu, J.McNew, J.A.Jin, M.Tao, Y.J.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: 8550-8555

  • DOI: 10.1073/pnas.1701747114

  • PubMed Abstract: 
  • Many enveloped viruses encode a matrix protein. In the influenza A virus, the matrix protein M1 polymerizes into a rigid protein layer underneath the viral envelope to help enforce the shape and structural integrity of intact viruses. The influenza v ...

    Many enveloped viruses encode a matrix protein. In the influenza A virus, the matrix protein M1 polymerizes into a rigid protein layer underneath the viral envelope to help enforce the shape and structural integrity of intact viruses. The influenza virus M1 is also known to mediate virus budding as well as the nuclear export of the viral nucleocapsids and their subsequent packaging into nascent viral particles. Despite extensive studies on the influenza A virus M1 (FLUA-M1), only crystal structures of its N-terminal domain are available. Here we report the crystal structure of the full-length M1 from another orthomyxovirus that infects fish, the infectious salmon anemia virus (ISAV). The structure of ISAV-M1 assumes the shape of an elbow, with its N domain closely resembling that of the FLUA-M1. The C domain, which is connected to the N domain through a flexible linker, is made of four α-helices packed as a tight bundle. In the crystal, ISAV-M1 monomers form infinite 2D arrays with a network of interactions involving both the N and C domains. Results from liposome flotation assays indicated that ISAV-M1 binds membrane via electrostatic interactions that are primarily mediated by a positively charged surface loop from the N domain. Cryoelectron tomography reconstruction of intact ISA virions identified a matrix protein layer adjacent to the inner leaflet of the viral membrane. The physical dimensions of the virion-associated matrix layer are consistent with the 2D ISAV-M1 crystal lattice, suggesting that the crystal lattice is a valid model for studying M1-M1, M1-membrane, and M1-RNP interactions in the virion.


    Organizational Affiliation

    Department of BioSciences, Rice University, Houston, TX 77251.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NS2
A, B, C
216Salmon isavirusMutation(s): 0 
Gene Names: NS2
Find proteins for Q910W0 (Salmon isavirus)
Go to UniProtKB:  Q910W0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.604 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 38.799α = 90.00
b = 95.886β = 93.03
c = 85.410γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SHARPphasing
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesC-1565 to YJT
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI077785 to YJT

Revision History 

  • Version 1.0: 2017-08-16
    Type: Initial release
  • Version 1.1: 2017-08-23
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence