Forms a complex with host RAN and probably binds to exportins carrying activated MAPK in order to mediate the hyperphosphorylation of host Phe/Gly containing nuclear pore proteins (Nups) resulting in cessation of active nucleocytoplasmic transport (By similarity). Proteins with NLS signals fail to import, cellular mRNAs fail to export, and some proteins small enough for diffusion are not retained anymore (efflux) (By similarity). The resulting inhibition of cellular protein synthesis serves to ensure maximal viral gene expression and to evade host immune response (By similarity). Forms an icosahedral capsid of pseudo T=3 symmetry with capsid proteins VP2 and VP3. Together they form an icosahedral capsid composed of 60 copies of each VP1, VP2, and VP3, with a diameter of approximately 300 Angstroms.VP4 lies on the inner surface of the protein shell formed by VP1, VP2 and VP3. All the three latter proteins contain a beta-sheet structure called beta-barrel jelly roll. VP1 is situated at the 12 fivefold axes, whereas VP2 and VP3 are located at the quasi-sixfold axes. Forms an icosahedral capsid of pseudo T=3 symmetry with capsid proteins VP2 and VP3. Together they form an icosahedral capsid composed of 60 copies of each VP1, VP2, and VP3, with a diameter of approximately 300 Angstroms.VP4 lies on the inner surface of the protein shell formed by VP1, VP2 and VP3. All the three latter proteins contain a beta-sheet structure called beta-barrel jelly roll. VP1 is situated at the 12 fivefold axes, whereas VP2 and VP3 are located at the quasi-sixfold axes. Forms an icosahedral capsid of pseudo T=3 symmetry with capsid proteins VP2 and VP3. Together they form an icosahedral capsid composed of 60 copies of each VP1, VP2, and VP3, with a diameter of approximately 300 Angstroms.VP4 lies on the inner surface of the protein shell formed by VP1, VP2 and VP3. All the three latter proteins contain a beta-sheet structure called beta-barrel jelly roll. VP1 is situated at the 12 fivefold axes, whereas VP2 and VP3 are located at the quasi-sixfold axes. Lies on the inner surface of the capsid shell (By similarity). After binding to the host receptor, the capsid undergoes conformational changes (By similarity). Capsid protein VP4 is released, capsid protein VP1 N-terminus is externalized, and together, they shape a pore in the host membrane through which the viral genome is translocated into the host cell cytoplasm (By similarity). After genome has been released, the channel shrinks (By similarity). VP0 precursor is a component of immature procapsids. Involved in host translation shutoff by inhibiting cap-dependent mRNA translation (By similarity). Nuclear localization is required for this function (By similarity). The resulting inhibition of cellular protein synthesis serves to ensure maximal viral gene expression and to evade host immune response (By similarity). Inhibits the phosphorylation of the leader protein (By similarity). Binds to the RNA stem-loop essential for the ribosomal frameshift event and trans-activates the production of protein 2B* (By similarity). Affects membrane integrity and causes an increase in membrane permeability. Associates with and induces structural rearrangements of intracellular membranes (By similarity). It displays RNA-binding, nucleotide binding and NTPase activities (By similarity). Interacts with IFIH1/MDA5 to inhibit the induction of the IFN-beta signal pathway (PubMed:30312637). Serves as membrane anchor via its hydrophobic domain. Forms a primer, VPg-pU, which is utilized by the polymerase for the initiation of RNA chains. Cysteine protease that generates mature viral proteins from the precursor polyprotein (By similarity). In addition to its proteolytic activity, it binds to viral RNA, and thus influences viral genome replication. RNA and substrate cooperatively bind to the protease. Cleaves host PABP1, this cleavage is important for viral replication (PubMed:22837200). Cleaves host TANK and disrupts the TANK-TBK1-IKKepsilon-IRF3 complex, thereby inhibiting the induction of the IFN-beta signal pathway (PubMed:28487378, PubMed:26363073). Replicates the genomic and antigenomic RNAs by recognizing replications specific signals (By similarity). Performs VPg uridylylation (By similarity). a ribonucleoside 5'-triphosphate + RNA(n) = diphosphate + RNA(n+1) ATP + H2O = ADP + H(+) + phosphate Selective cleavage of Gln-|-Gly bond in the poliovirus polyprotein. In other picornavirus reactions Glu may be substituted for Gln, and Ser or Thr for Gly. Interacts with host TRIM22; this interaction leads to the ubiquitination of protease 3C and may restrict the virus replication (PubMed:19218198). Interacts with host EIF4E (By similarity). Interacts with the leader protein (By similarity). Interacts with host RAN; the complex L-RAN recruits cellular kinases responsible for the L-induced nucleocytoplasmic trafficking inhibition (By similarity). The complex L-RAN can further bind to the host exportins XPO1/CRM1 and CSE1L/CAS (By similarity). Interacts with the protein 2A (By similarity). Interacts with host IFIH1/MDA5; this interaction inhibits the induction of the IFN-beta signal pathway (PubMed:30312637). Interacts with host TMEM39A. Interacts with host TMEM39A. Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are probably autophagosome-like vesicles. Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are probably autophagosome-like vesicles. Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are probably autophagosome-like vesicles. Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are probably autophagosome-like vesicles. Phosphorylated. Specific enzymatic cleavages by the viral protease in vivo yield a variety of precursors and mature proteins (PubMed:6324136, PubMed:3467351). The polyprotein seems to be cotranslationally cleaved at the 2A/2B junction by a ribosomal skip from one codon to the next without formation of a peptide bond (PubMed:25258322). This process would release the P1-2A peptide from the translational complex (PubMed:25258322). During virion maturation, immature virions are rendered infectious following cleavage of VP0 into VP4 and VP2. This maturation seems to be an autocatalytic event triggered by the presence of RNA in the capsid and is followed by a conformational change of the particle. Uridylylated by the polymerase and is covalently linked to the 5'-end of genomic RNA. This uridylylated form acts as a nucleotide-peptide primer for the polymerase. Myristoylation is required during RNA encapsidation and formation of the mature virus particle. Produced by conventional translation. Belongs to the picornaviruses polyprotein family.