Structural protein involved in the envelopment of mature virion (MV) to form the wrapped virion (WV). The wrapping consists of the addition of Golgi membranes to the mature virion. Participates in mature virion (MV) movement within the infected cell. May play an indirect role in MV-cell fusion (By similarity). Homohexamers, covalently linked. Interacts with A17 (By similarity). Located to the mature virion membrane via interaction with protein A17. Belongs to the chordopoxvirinae A27 protein family.