Capsid protein that self-associates to form pentons, building the capsid in association with hexamers of the major capsid protein and one dodecamer of the portal protein. The capsid vertex protein self-associates to form 11 pentons, building the T=13 laevo capsid in association with 160 hexamers of the major capsid protein. Homopentamer. Interacts with the portal protein. Interacts with the major capsid protein that forms 160 hexamers. Part of the capsid icosahedric shell of the immature virion. The capsid contains 55 copies. Part of the capsid icosahedric shell of the mature virion. The capsid contains 55 copies. A proteolytic cleavage gives rise to the mature capsid vertex protein. Belongs to the Tevenvirinae capsid vertex family.