Genome polyprotein - P03300 (POLG_POL1M)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Forms an icosahedral capsid of pseudo T=3 symmetry with capsid proteins VP2 and VP3 (PubMed:2994218). The capsid is 300 Angstroms in diameter, composed of 60 copies of each capsid protein and enclosing the viral positive strand RNA genome (PubMed:2994218). Capsid protein VP1 mainly forms the vertices of the capsid (PubMed:23365424). Capsid protein VP1 interacts with host cell receptor PVR to provide virion attachment to target host epithelial cells (PubMed:25631086). This attachment induces virion internalization predominantly through clathrin- and caveolin-independent endocytosis in Hela cells and through caveolin-mediated endocytosis in brain microvascular endothelial cells (PubMed:17717529, PubMed:18191571, PubMed:17622193). Tyrosine kinases are probably involved in the entry process (PubMed:17717529). Virus binding to PVR induces increased junctional permeability and rearrangement of junctional proteins (PubMed:17717529). Modulation of endothelial tight junctions, as well as cytolytic infection of endothelial cells themselves, may result in loss of endothelial integrity which may help the virus to reach the CNS (PubMed:17717529). After binding to its receptor, the capsid undergoes conformational changes (PubMed:25631086). Capsid protein VP1 N-terminus (that contains an amphipathic alpha-helix) and capsid protein VP4 are externalized (PubMed:25631086). Together, they shape a pore in the host membrane through which viral genome is translocated to host cell cytoplasm (PubMed:25631086). UniProt
Catalytic Activity
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. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Interacts with Viral protein genome-linked and with protein 3CD. UniProt
The N-terminus has membrane-binding (PubMed:9696129). The N-terminus also displays RNA-binding properties (PubMed:7730315). The N-terminus is involved in oligomerization (PubMed:19520852). The central part contains an ATPase domain and a C4-type zinc-finger (PubMed:30231078). The C-terminus is involved in RNA-binding (PubMed:7730315). The extreme C-terminus contains a region involved in oligomerization (PubMed:30231078). UniProt
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