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Tospoviridae is a family of enveloped RNA plant viruses that infect many field crops, inflicting a heavy global economic burden. These tripartite, single-stranded, negative-sense RNA viruses are transmitted from plant to plant by thrips as the insect vector. The medium (M) segment of the viral genome encodes two envelope glycoproteins, G N and G C , which together form the envelope spikes. G C is considered the virus fusogen, while the accompanying G N protein serves as an attachment protein that binds to a yet unknown receptor, mediating the virus acquisition by the thrips carrier. Here we present the crystal structure of glycoprotein N (G N ) from the tomato spotted wilt virus (TSWV), a representative member of the Tospoviridae family. The structure suggests that G N is organized as dimers on TSWV's outer shell. Our structural data also suggest that this dimerization is required for maintaining G N structural integrity. Although the structure of the TSWV G N is different from other bunyavirus G N proteins, they all share similar domain connectivity that resembles glycoproteins from unrelated animal-infecting viruses, suggesting a common ancestor for these accompanying proteins.

Crystal structure of tomato spotted wilt virus GNreveals a dimer complex formation and evolutionary link to animal-infecting viruses

Crystal structure of tomato spotted wilt virus G_Nreveals a dimer complex formation and evolutionary link to animal-infecting viruses