Abstract
Alcelaphine herpesvirus 1 is a gammaherpesvirus which causes malignant catarrhal fever, an acute lymphoproliferative disorder of cattle and other susceptible Bovidae, which is almost invariably fatal. A preliminary analysis of proteins induced by the virus indicated that as many as six glycoproteins and one nonglycosylated molecule might be present in the virus envelope. Monoclonal antibodies selected for recognition of virion envelope proteins included two that recognized a complex of infected cell proteins, designated the gp115 complex, and neutralized virus infectivity in the absence of complement. The gp115 complex consisted of five glycoproteins of 115, 110, 105, 78, and 48 kilodaltons (kDa), and all except the 48-kDa species reacted with antibody in Western blots (immunoblots). Pulse-chase experiments analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing and nonreducing conditions suggested that the 110-kDa protein was the precursor molecule which was processed by addition of sugars to 115 kDa. The 115-kDa protein was cleaved to form a disulfide-linked heterodimer of 78 and 48 kDa, which was the mature form of the molecule incorporated into the virion envelope. The glycoprotein contained N-linked sugars, but little or no O-linked sugar was present. The relative abundance of the mature protein and its ability to induce neutralizing antibodies suggest that it will prove useful to studies aimed at elucidating the biology and pathogenesis of alcelaphine herpesvirus 1.
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