4ow5

Structural basis for the enhancement of virulence by entomopoxvirus fusolin and its in vivo crystallization into viral spindles

spinqualitylabelsall models 4ow5, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ow5 is a 1 chain structure with sequence from Unidentified entomopoxvirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EDO Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed 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. Structural basis for the enhancement of virulence by viral spindles and their in vivo crystallization.,Chiu E, Hijnen M, Bunker RD, Boudes M, Rajendran C, Aizel K, Olieric V, Schulze-Briese C, Mitsuhashi W, Young V, Ward VK, Bergoin M, Metcalf P, Coulibaly F Proc Natl Acad Sci U S A. 2015 Mar 18. pii: 201418798. PMID:25787255 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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