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The type-common CP-1 antigen of herpes simplex virus type 1 (HSV-1) is associated in the infected cell with two components, a 52,000-molecular-weight glycoprotein (gp52 or pD) and a 59,000-molecular-weight glycoprotein (gp59 or D). The larger form (D) is also found in the virion envelope. It was postulated that pD is a precursor of D. We found that pD shared methionine and arginine tryptic peptides with D isolated from infected cell extracts. D isolated from infected extracts had the same trypric methionine peptide profile as D isolated from the virion envelope. Thus, processing of pD to D does not involve any major alterations in polypeptide structure. Furthermore, D did not share tryptic methionine peptides with the other major glycoproteins of HSV-1. Using [2-3H]mannose as a specific glycoprotein label, we found that pD, which is a basic protein (isoelectric point = 8.0) contained a 1,800-molecular-weight oligomannosyl core moiety and was processed by further glycosylation and sialyation to a more acidic and heterogeneous molecule D, which as a molecular weight of at least 59,000.

Structural analysis of precursor and product forms of type-common envelope glycoprotein D (CP-1 antigen) of herpes simplex virus type 1