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Annual Review of Virology

Volume 9, 2022

Crowning Touches in Positive-Strand RNA Virus Genome Replication Complex Structure and Function

Abstract

Positive-strand RNA viruses, the largest genetic class of eukaryotic viruses, include coronaviruses and many other established and emerging pathogens. A major target for understanding and controlling these viruses is their genome replication, which occurs in virus-induced membrane vesicles that organize replication steps and protect double-stranded RNA intermediates from innate immune recognition. The structure of these complexes has been greatly illuminated by recent cryo-electron microscope tomography studies with several viruses. One key finding in diverse systems is the organization of crucial viral RNA replication factors in multimeric rings or crowns that among other functions serve as exit channels gating release of progeny genomes to the cytosol for translation and encapsidation. Emerging results suggest that these crowns serve additional important purposes in replication complex assembly, function, and interaction with downstream processes such as encapsidation. The findings provide insights into viral function and evolution and new bases for understanding, controlling, and engineering positive-strand RNA viruses.

Keyword(s): alphavirus, coronavirus, crown complex, cryo-EM tomography, nodavirus, positive-strand RNA virus, RNA replication complex
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/content/journals/10.1146/annurev-virology-092920-021307
2022-09-29
2024-05-12
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/content/journals/10.1146/annurev-virology-092920-021307
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Crowning Touches in Positive-Strand RNA Virus Genome Replication Complex Structure and Function
Annual Review of Virology 9, 193 (2022); https://doi.org/10.1146/annurev-virology-092920-021307
/content/journals/10.1146/annurev-virology-092920-021307
/content/journals/10.1146/annurev-virology-092920-021307
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