1887

Abstract

The extracellular portion (amino acids 1 to 844) of the equine herpesvirus type 1 (EHV-1) glycoprotein gpl4, the homologue of gB of herpes simplex virus, was expressed in and in insect cells using a recombinant baculovirus. Immunoblot analysis revealed that the recombinant expressed a fusion protein of 135K which was composed of the truncated gpl4 and the maltose-binding protein (MBP) provided by the vector and a 90K protein lacking the MBP moiety. Both proteins were sequestered within the cells in form of inclusion bodies. Infection of insect cells with the recombinant baculovirus resulted in the production of a 115K to 118K glycoprotein which was cleaved intracellularly into two subunits of 55K and 63K to 65K. The cleaved subunits were secreted into the cell culture supernatant and formed disulphide-linked dimers of 120K to 122K. The recombinant proteins produced in and in insect cells elicited EHV-1-specific antibodies in goats as demonstrated by Western blot analysis. The gpl4 expressed in insect cells induced antibodies with virus-neutralizing activity. In contrast, the truncated gpl4 expressed by failed to elicit neutralizing antibodies. The results suggest that posttranslational modification of the EHV-1 gpl4 may be important for the expression of epitopes necessary for the induction of neutralizing antibodies.

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1994-08-01
2022-05-28
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