MERS-CoV: structure, attachment, entrance, and genomic composition Several structures of the spike proteins have been resolved. The receptor binding domain in the alpha- and<unk>  spike protein is cataloged as . The spike protein, a type 1 fusion machine, assembles into a trimer (); its core structure resembles that of paramyxovirus F (fusion) proteins. The receptor usage is not very conserved; for example, among Sarbecovirus, only a sub-lineage containing SARS share the ACE2 receptor. The viruses of subgenera Embecovirus differ from all others in the genus in that they have an additional shorter (8 nm) spike-like protein called hemagglutinin esterase (HE) (). It is believed to have been acquired from influenza C virus.
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Senecavirus