Human cytomegalovirus hijacks the autophagic machinery and LC3 homologs in order to optimize cytoplasmic envelopment of mature infectious particles View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Clémence Taisne, Marion Lussignol, Eva Hernandez, Arnaud Moris, Lina Mouna, Audrey Esclatine

ABSTRACT

During its life cycle, Human cytomegalovirus (HCMV) tightly modulates autophagy, a vesicular pathway allowing degradation and recycling of cellular components. To study the interplay between autophagy and the viral life cycle, we established various autophagy-deficient human fibroblastic cell lines. By knocking down the expression or activity of five autophagy-related proteins, we confirmed the proviral function that the autophagic machinery exerts on HCMV production. Using 3D reconstruction from confocal microscopy and electron microscopy, we demonstrated that lipidated LC3-positive vesicles accumulated at the viral assembly compartment (vAC). The vAC is a juxtanuclear ring-shaped structure containing several organelles and membranes, where assembly and final envelopment of HCMV particles occur. Two LC3 homologs, GABARAPL1 and GATE16, also accumulated during HCMV infection and were associated with the vAC, in proximity with fragmented Golgi stacks. Additionally, we observed the formation of a pre-assembly compartment (PrAC) in infected cells, which consists of a juxtanuclear structure containing both fragmented Golgi and LC3-positive vesicles. Finally, we showed that highly purified extracellular viral particles were associated with various autophagy proteins. Our results thus suggest that autophagy machinery participates to the final cytoplasmic envelopment of HCMV viral particles into the vAC and that autophagy-related proteins can be spotted in the virions. More... »

PAGES

4560

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-41029-z

DOI

http://dx.doi.org/10.1038/s41598-019-41029-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112758891

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30872707


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53 schema:description During its life cycle, Human cytomegalovirus (HCMV) tightly modulates autophagy, a vesicular pathway allowing degradation and recycling of cellular components. To study the interplay between autophagy and the viral life cycle, we established various autophagy-deficient human fibroblastic cell lines. By knocking down the expression or activity of five autophagy-related proteins, we confirmed the proviral function that the autophagic machinery exerts on HCMV production. Using 3D reconstruction from confocal microscopy and electron microscopy, we demonstrated that lipidated LC3-positive vesicles accumulated at the viral assembly compartment (vAC). The vAC is a juxtanuclear ring-shaped structure containing several organelles and membranes, where assembly and final envelopment of HCMV particles occur. Two LC3 homologs, GABARAPL1 and GATE16, also accumulated during HCMV infection and were associated with the vAC, in proximity with fragmented Golgi stacks. Additionally, we observed the formation of a pre-assembly compartment (PrAC) in infected cells, which consists of a juxtanuclear structure containing both fragmented Golgi and LC3-positive vesicles. Finally, we showed that highly purified extracellular viral particles were associated with various autophagy proteins. Our results thus suggest that autophagy machinery participates to the final cytoplasmic envelopment of HCMV viral particles into the vAC and that autophagy-related proteins can be spotted in the virions.
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