Assembles to form a prolate capsid shell of about 54 nm in length and 45 nm in width, with a T=3, Q=5 symmetry. Homohexamer. Homopentamer. The prolate capsid is composed of pentamers and hexamers of the capsid protein. Present in about 235 copies in the virion. Belongs to the phi29likevirus major capsid protein family.