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Influenza A virus ribonucleoproteins form liquid organelles at endoplasmic reticulum exit sites.


ABSTRACT: Influenza A virus has an eight-partite RNA genome that during viral assembly forms a complex containing one copy of each RNA. Genome assembly is a selective process driven by RNA-RNA interactions and is hypothesized to lead to discrete punctate structures scattered through the cytosol. Here, we show that contrary to the accepted view, formation of these structures precedes RNA-RNA interactions among distinct viral ribonucleoproteins (vRNPs), as they assemble in cells expressing only one vRNP type. We demonstrate that these viral inclusions display characteristics of liquid organelles, segregating from the cytosol without a delimitating membrane, dynamically exchanging material and adapting fast to environmental changes. We provide evidence that viral inclusions develop close to endoplasmic reticulum (ER) exit sites, depend on continuous ER-Golgi vesicular cycling and do not promote escape to interferon response. We propose that viral inclusions segregate vRNPs from the cytosol and facilitate selected RNA-RNA interactions in a liquid environment.

SUBMITTER: Alenquer M 

PROVIDER: S-EPMC6456594 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Influenza A virus ribonucleoproteins form liquid organelles at endoplasmic reticulum exit sites.

Alenquer Marta M   Vale-Costa Sílvia S   Etibor Temitope Akhigbe TA   Ferreira Filipe F   Sousa Ana Laura AL   Amorim Maria João MJ  

Nature communications 20190409 1


Influenza A virus has an eight-partite RNA genome that during viral assembly forms a complex containing one copy of each RNA. Genome assembly is a selective process driven by RNA-RNA interactions and is hypothesized to lead to discrete punctate structures scattered through the cytosol. Here, we show that contrary to the accepted view, formation of these structures precedes RNA-RNA interactions among distinct viral ribonucleoproteins (vRNPs), as they assemble in cells expressing only one vRNP typ  ...[more]

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