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J. Virol., 06 1996, 4110-4115, Vol 70, No. 6
N Osterrieder, A Neubauer, C Brandmuller, B Braun, OR Kaaden and JD Baines
Experiments to analyze the function of the equine herpesvirus 1 (EHV-1)
glycoprotein gM homolog were conducted. To this end, an Rk13 cell line
(TCgM) that stably expressed EHV-1 gM was constructed. Proteins with
apparent M(r)s of 46,000 to 48,000 and 50,000 to 55,000 were detected in
TCgM cells with specific anti-gM antibodies, and the gM protein pattern was
indistinguishable from that in cells infected with EHV-1 strain RacL11. A
viral mutant (L11deltagM) bearing an Escherichia coli lacZ gene inserted
into the EHV-1 strain RacL11 gM gene (open reading frame 52) was purified,
and cells infected with L11deltagM did not contain detectable gM.
L11deltagM exhibited approximately 100-fold lower titers and a more than
2-fold reduction in plaque size relative to wild-type EHV-1 when grown and
titrated on noncomplementing cells. Viral titers were reduced only 10-fold
when L11deltagM was grown on the complementing cell line TCgM and titrated
on noncomplementing cells. L11deltagM also exhibited slower penetration
kinetics compared with those of the parental EHV-1 RacL11. It is concluded
that EHV-1 gM plays important roles in the penetration of virus into the
target cell and in spread of EHV-1 from cell to cell.
Copyright © 1996, American Society for Microbiology
The equine herpesvirus 1 glycoprotein gp21/22a, the herpes simplex virus type 1 gM homolog, is involved in virus penetration and cell-to- cell spread of virions
Institute for Medical Microbiology, Infectious and Epidemic Diseases, Ludwig-Maximilians-Universitat Munchen, Germany. klaus.osterrieder@lrz.uni-muenchen.de
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