poliovirus replication cycle
CYTOPLASMIC
Attachement of the virus to host receptors mediates endocytosis of the virus into the host cell.
The capsid undergoes a conformational change and releases VP4 that opens a pore in the host endosomal membrane and the viral genomic RNA penetrates into the host cell cytoplasm (the empty capsid remains intact).
VPg is removed from the viral RNA, which is then translated into a processed polyprotein.
Shutoff of cellular cap-dependent translation through the cleavage of translation initiation factors by viral protease.
Replication occurs in viral factories made of membrane vesicles derived from the ER. A dsRNA genome is synthesized from the genomic ssRNA(+). The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes. New genomic RNA is believed to be packaged into preassembled procapsids. Cell lysis and virus release. Maturation of provirions by an unknown host protease.