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VP13 and VP14, major tegument proteins of herpes simplex virus type 1 (HSV-1) and the products of the UL47 gene, have been shown by partial proteolytic mapping to have closely related protein sequences. These proteins are phosphorylated in virus-infected cells, but not in preparations of purified virus. They also contain O-linked oligosaccharide units which include β-1,4-N-acetyl galactosamine residues, as demonstrated by the binding of Dolichos biflorus lectin. This modification was detected only in purified virus and appears to be restricted to VP13/14 and VP22, another HSV-1 tegument protein.
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