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Structure of the Macrobrachium rosenbergii nodavirus: A new genus within the Nodaviridae?

DOI: 10.1371/journal.pbio.3000038 DOI Help

Authors: Kok Lian Ho (Universiti Putra Malaysia) , Mads Gabrielsen (CRUK Beatson Institute) , Poay Ling Beh (Universiti Putra Malaysia) , Chare Li Kueh (Universiti Putra Malaysia) , Qiu Xian Thong (Universiti Putra Malaysia) , James Streetley (MRC-University of Glasgow Centre for Virus Research) , Wen Siang Tan (Universiti Putra Malaysia) , David Bhella (MRC-University of Glasgow Centre for Virus Research)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Plos Biology , VOL 16

State: Published (Approved)
Published: October 2018
Diamond Proposal Number(s): 16810

Open Access Open Access

Abstract: Macrobrachium rosenbergii nodavirus (MrNV) is a pathogen of freshwater prawns that poses a threat to food security and causes significant economic losses in the aquaculture industries of many developing nations. A detailed understanding of the MrNV virion structure will inform the development of strategies to control outbreaks. The MrNV capsid has also been engineered to display heterologous antigens, and thus knowledge of its atomic resolution structure will benefit efforts to develop tools based on this platform. Here, we present an atomic-resolution model of the MrNV capsid protein (CP), calculated by cryogenic electron microscopy (cryoEM) of MrNV virus-like particles (VLPs) produced in insect cells, and three-dimensional (3D) image reconstruction at 3.3 Å resolution. CryoEM of MrNV virions purified from infected freshwater prawn post-larvae yielded a 6.6 Å resolution structure, confirming the biological relevance of the VLP structure. Our data revealed that unlike other known nodavirus structures, which have been shown to assemble capsids having trimeric spikes, MrNV assembles a T = 3 capsid with dimeric spikes. We also found a number of surprising similarities between the MrNV capsid structure and that of the Tombusviridae: 1) an extensive network of N-terminal arms (NTAs) lines the capsid interior, forming long-range interactions to lace together asymmetric units; 2) the capsid shell is stabilised by 3 pairs of Ca2+ ions in each asymmetric unit; 3) the protruding spike domain exhibits a very similar fold to that seen in the spikes of the tombusviruses. These structural similarities raise questions concerning the taxonomic classification of MrNV

Journal Keywords: Virus; capsid; nodavirus; tombusvirus; cryoEM

Subject Areas: Biology and Bio-materials

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