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dc.contributor.authorGuo, Yusong R.
Fan, Yanlin
Zhou, Ying
Jin, Miao
Zhang, Jim L.
Jiang, Hongbing
Holt, Matthew V.
Wang, Tao
Young, Nicolas L.
Wang, David
Zhong, Weiwei
Tao, Yizhi J.
dc.date.accessioned 2020-11-11T20:20:28Z
dc.date.available 2020-11-11T20:20:28Z
dc.date.issued 2020
dc.identifier.citation Guo, Yusong R., Fan, Yanlin, Zhou, Ying, et al.. "Orsay Virus CP-δ Adopts a Novel β-Bracelet Structural Fold and Incorporates into Virions as a Head Fiber." Journal of Virology, 94, no. 21 (2020) American Society for Microbiology: https://doi.org/10.1128/JVI.01560-20.
dc.identifier.urihttps://hdl.handle.net/1911/109550
dc.description.abstract Fiber proteins are commonly found in eukaryotic and prokaryotic viruses, where they play important roles in mediating viral attachment and host cell entry. They typically form trimeric structures and are incorporated into virions via noncovalent interactions. Orsay virus, a small RNA virus which specifically infects the laboratory model nematode Caenorhabditis elegans, encodes a fibrous protein δ that can be expressed as a free protein and as a capsid protein-δ (CP-δ) fusion protein. Free δ has previously been demonstrated to facilitate viral exit following intracellular expression; however, the biological significance and prevalence of CP-δ remained relatively unknown. Here, we demonstrate that Orsay CP-δ is covalently incorporated into infectious particles, the first example of any attached viral fibers known to date. The crystal structure of δ(1–101) (a deletion mutant containing the first 101 amino acid [aa] residues of δ) reveals a pentameric, 145-Å long fiber with an N-terminal coiled coil followed by multiple β-bracelet repeats. Electron micrographs of infectious virions depict particle-associated CP-δ fibers with dimensions similar to free δ. The δ proteins from two other nematode viruses, Le Blanc and Santeuil, which both specifically infect Caenorhabditis briggsae, were also found to form fibrous molecules. Recombinant Le Blanc δ was able to block Orsay virus infection in worm culture and vice versa, suggesting these two viruses likely compete for the same cell receptor(s). Thus, we propose that while CP-δ likely mediates host cell attachment for all three nematode viruses, additional downstream factor(s) ultimately determine the host specificity and range of each virus.
dc.language.iso eng
dc.publisher American Society for Microbiology
dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Orsay Virus CP-δ Adopts a Novel β-Bracelet Structural Fold and Incorporates into Virions as a Head Fiber
dc.type Journal article
dc.citation.journalTitle Journal of Virology
dc.subject.keywordOrsay virus
crystallography
Caenorhabditis elegans
β-bracelet
viral fiber
dc.citation.volumeNumber 94
dc.citation.issueNumber 21
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1128/JVI.01560-20
dc.type.publication publisher version
dc.citation.articleNumber e01560-20


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