Minor capsid protein VP1

UniProtKB accession:  Q3YPH4

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UniProtKB description:  Capsid proteins self-assembles to form an icosahedral capsid with a T=1 symmetry, about 26 nm in diameter, and consisting of 60 copies of three size variants of the capsid proteins, VP1, and VP3, which differ by the presence of an N-terminal extension in the minor protein VP1 (Probable). The capsid has a channel at the 5-fold axis and there are densities extending the 5-fold axis into the interior of the capsid (PubMed:28331084). The capsid encapsulates the genomic ssDNA (Probable). Binding to the host receptors also induces capsid rearrangements leading to surface exposure of VP1 N-terminus, specifically its phospholipase A2-like region. The additional N-terminal region of isoform Minor capsid protein VP1, called VP1u, may serve as a lipolytic enzyme to breach the endosomal membrane during entry into host cell and might contribute to virus transport to the nucleus (By similarity).