Down-regulates MHC-I expression by impairing the appropriate configuration or presentation into the plasma membrane of the latter (PubMed:21069396). Participates in viral hemadsorption, which may help viral spread (PubMed:10639320). Reduces the transactivating activity of host TP53, thus inhibiting apoptosis (PubMed:15262504). Non-essential for virus growth in swine macrophage cell cultures (By similarity). Homodimer. Expressed in the early phase of the viral replicative cycle. Expressed in the late phase of the viral replicative cycle. Belongs to the asfivirus lectin-like protein family.