A sialyltransferase adds a terminal sialic acid moiety to protein 3a with an O-linked glycosyl side chain. This glycosylated form later is associated with the virion (Oostra et al, 2006).
de Haan, CA, de Groot, RJ, Oostra, M, Rottier, PJ
sialyltransferase activity of sialyltransferases
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