4X29

Structural basis for the enhancement of virulence by entomopoxvirus fusolin and its in vivo crystallization into viral spindles (complex with Zinc)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.162 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis for the enhancement of virulence by viral spindles and their in vivo crystallization.

Chiu, E.Hijnen, M.Bunker, R.D.Boudes, M.Rajendran, C.Aizel, K.Olieric, V.Schulze-Briese, C.Mitsuhashi, W.Young, V.Ward, V.K.Bergoin, M.Metcalf, P.Coulibaly, F.

(2015) Proc Natl Acad Sci U S A 112: 3973-3978

  • DOI: 10.1073/pnas.1418798112
  • Primary Citation of Related Structures:  
    4OW5, 4X27, 4X29, 4YN1, 4YN2

  • PubMed Abstract: 
  • The great benefits that chemical pesticides have brought to agriculture are partly offset by widespread environmental damage to nontarget species and threats to human health. Microbial bioinsecticides are considered safe and highly specific alternatives but generally lack potency ...

    The great benefits that chemical pesticides have brought to agriculture are partly offset by widespread environmental damage to nontarget species and threats to human health. Microbial bioinsecticides are considered safe and highly specific alternatives but generally lack potency. Spindles produced by insect poxviruses are crystals of the fusolin protein that considerably boost not only the virulence of these viruses but also, in cofeeding experiments, the insecticidal activity of unrelated pathogens. However, the mechanisms by which spindles assemble into ultra-stable crystals and enhance virulence are unknown. Here we describe the structure of viral spindles determined by X-ray microcrystallography from in vivo crystals purified from infected insects. We found that a C-terminal molecular arm of fusolin mediates the assembly of a globular domain, which has the hallmarks of lytic polysaccharide monooxygenases of chitinovorous bacteria. Explaining their unique stability, a 3D network of disulfide bonds between fusolin dimers covalently crosslinks the entire crystalline matrix of spindles. However, upon ingestion by a new host, removal of the molecular arm abolishes this stabilizing network leading to the dissolution of spindles. The released monooxygenase domain is then free to disrupt the chitin-rich peritrophic matrix that protects insects against oral infections. The mode of action revealed here may guide the design of potent spindles as synergetic additives to bioinsecticides.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, VIC 3800, Australia; fasseli.coulibaly@monash.edu peter.metcalf@auckland.ac.nz.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FusolinA369EntomopoxvirinaeMutation(s): 0 
UniProt
Find proteins for Q83389 (unidentified entomopoxvirus)
Explore Q83389 
Go to UniProtKB:  Q83389
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.162 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.79α = 90
b = 71.79β = 90
c = 129.59γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
BUSTERphasing
DENZOdata reduction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
ARC Discovery ProjectAustralia120104039

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-18
    Type: Initial release
  • Version 1.1: 2015-04-01
    Changes: Database references
  • Version 1.2: 2015-04-08
    Changes: Database references