7SKS

Crystal structure of measles virus matrix protein

• PDB DOI: https://doi.org/10.2210/pdb7SKS/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Measles virus strain Ichinose-B95a
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2021-10-21 Released: 2022-08-24 
• Deposition Author(s): Norris, M.J., Saphire, E.O.
• Funding Organization(s): Other private

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.54 Å
• R-Value Free: 0.257 
• R-Value Work: 0.231 
• R-Value Observed: 0.232 

Starting Model: experimental

Literature

Measles and Nipah virus assembly: Specific lipid binding drives matrix polymerization.

Norris, M.J., Husby, M.L., Kiosses, W.B., Yin, J., Saxena, R., Rennick, L.J., Heiner, A., Harkins, S.S., Pokhrel, R., Schendel, S.L., Hastie, K.M., Landeras-Bueno, S., Salie, Z.L., Lee, B., Chapagain, P.P., Maisner, A., Duprex, W.P., Stahelin, R.V., Saphire, E.O.

(2022) Sci Adv 8: eabn1440-eabn1440

• PubMed: 35857835 
• DOI: https://doi.org/10.1126/sciadv.abn1440
• Primary Citation of Related Structures:  
  7SKS, 7SKT, 7SKU


• PubMed Abstract: 
  

  Measles virus, Nipah virus, and multiple other paramyxoviruses cause disease outbreaks in humans and animals worldwide. The paramyxovirus matrix (M) protein mediates virion assembly and budding from host cell membranes. M is thus a key target for antivirals, but few high-resolution structures of paramyxovirus M are available, and we lack the clear understanding of how viral M proteins interact with membrane lipids to mediate viral assembly and egress that is needed to guide antiviral design. Here, we reveal that M proteins associate with phosphatidylserine and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P ₂ ] at the plasma membrane. Using x-ray crystallography, electron microscopy, and molecular dynamics, we demonstrate that PI(4,5)P ₂ binding induces conformational and electrostatic changes in the M protein surface that trigger membrane deformation, matrix layer polymerization, and virion assembly.

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Organizational Affiliation: 

Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: light scattering, electron microscopy, microscopy

Macromolecule Content

• Total Structure Weight: 83.47 kDa 
• Atom Count: 4,484 
• Modelled Residue Count: 553 
• Deposited Residue Count: 752 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Matrix protein	A, B	376	Measles virus strain Ichinose-B95a	Mutation(s): 0  Gene Names: M
UniProt
Find proteins for Q9W850 (Measles virus (strain Ichinose-B95a)) Explore Q9W850  Go to UniProtKB:  Q9W850

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.54 Å
• R-Value Free: 0.257 
• R-Value Work: 0.231 
• R-Value Observed: 0.232 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.954	α = 90
b = 85.954	β = 90
c = 402.506	γ = 120

Software Package:

Software Name	Purpose
autoPROC	data processing
XDS	data reduction
Aimless	data scaling
TRUNCATE	data processing
BUSTER	refinement
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2022-08-24 
Deposition Author(s): Norris, M.J., Saphire, E.O.

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Funding Organization	Location	Grant Number
Other private	United States	--

Revision History  

• Version 1.0: 2022-08-24
  Type: Initial release
  
• Version 1.1: 2023-10-18
  Changes: Data collection, Refinement description