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Annual Review of Virology

Volume 11, 2024

Expanding the Plant Virome: Umbra-Like Viruses Use Host Proteins for Movement

Abstract

Before the very recent discovery of umbra-like viruses (ULVs), the signature defining feature of all plant RNA viruses was the encoding of specialized RNA-binding movement proteins (MPs) for transiting their RNA genomes through gated plasmodesmata to establish systemic infections. The vast majority of ULVs share umbravirus-like RNA-dependent RNA polymerases and 3′-terminal structures, but they differ by not encoding cell-to-cell and long-distance MPs and by not relying on a helper virus for -encapsidation and plant-to-plant transmission. The recent finding that two groups of ULVs do not necessarily encode MPs is expanding our understanding of the minimum requirements for modern plant RNA viruses. ULV CY1 from citrus uses host protein PHLOEM PROTEIN 2 (PP2) for systemic movement, and related ULVs encode a capsid protein, thereby providing an explanation for the lack of helper viruses present in many ULV-infected plants. ULVs thus resemble the first viruses that infected plants, which were likely deposited from feeding organisms and would have similarly required the use of host proteins such as PP2 to exit initially infected cells.

Keyword(s): phloem protein 2, plant RNA movement, RNA virus evolution, single jelly roll capsid proteins, umbra-like virus, umbravirus
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2024-09-26
2024-12-12
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Expanding the Plant Virome: Umbra-Like Viruses Use Host Proteins for Movement
Annual Review of Virology 11, 283 (2024); https://doi.org/10.1146/annurev-virology-111821-122718
/content/journals/10.1146/annurev-virology-111821-122718
/content/journals/10.1146/annurev-virology-111821-122718
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