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Viruses ; 13(9)2021 09 06.
Artigo em Inglês | MEDLINE | ID: mdl-34578359

RESUMO

A common viral replication strategy is characterized by the assembly of intracellular compartments that concentrate factors needed for viral replication and simultaneously conceal the viral genome from host-defense mechanisms. Recently, various membrane-less virus-induced compartments and cellular organelles have been shown to represent biomolecular condensates (BMCs) that assemble through liquid-liquid phase separation (LLPS). In the present work, we analyze biophysical properties of intranuclear replication compartments (RCs) induced during human adenovirus (HAdV) infection. The viral ssDNA-binding protein (DBP) is a major component of RCs that contains intrinsically disordered and low complexity proline-rich regions, features shared with proteins that drive phase transitions. Using fluorescence recovery after photobleaching (FRAP) and time-lapse studies in living HAdV-infected cells, we show that DBP-positive RCs display properties of liquid BMCs, which can fuse and divide, and eventually form an intranuclear mesh with less fluid-like features. Moreover, the transient expression of DBP recapitulates the assembly and liquid-like properties of RCs in HAdV-infected cells. These results are of relevance as they indicate that DBP may be a scaffold protein for the assembly of HAdV-RCs and should contribute to future studies on the role of BMCs in virus-host cell interactions.


Assuntos
Adenoviridae/metabolismo , Condensados Biomoleculares , Proteínas de Ligação a DNA/metabolismo , Compartimentos de Replicação Viral/fisiologia , Replicação Viral/fisiologia , Adenoviridae/genética , Infecções por Adenoviridae , Adenovírus Humanos/metabolismo , Linhagem Celular , Proteínas de Ligação a DNA/química , Interações entre Hospedeiro e Microrganismos , Humanos , Organelas/virologia , Domínios Proteicos , Proteínas Virais/química , Proteínas Virais/genética , Proteínas Virais/metabolismo
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