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J Virol. 1986 May; 58(2): 367-376

Expression and regulation of glycoprotein C gene of herpes simplex virus 1 resident in a clonal L-cell line.

ABSTRACT

Ltk- cells were transfected with a plasmid containing the entire domain of glycoprotein C (gC), a true gamma or gamma 2 gene of herpes simplex virus 1 (HSV-1) and the methotrexate-resistant mouse dihydrofolate reductase mutant gene. The resulting methotrexate-resistant cell line was cloned; of the 39 clonal lines tested only 1, L3153(28), expressed gC after infection with HSV-1(MP), a gC- mutant, and none expressed gC constitutively. The induction of gC was optimal at multiplicities ranging between 0.5 and 2 PFU per cell, and the quantities produced were equivalent to or higher than those made by methotrexate-resistant gC- L cells infected with wild-type (gC+) virus. The gC gene resident in the L3153(28) cells was regulated as a beta gene inasmuch as the amounts of gC made in infected L3153(28) cells exposed to concentrations of phosphonoacetate that inhibited viral DNA synthesis were higher than those made in the absence of the drug, gC was induced at both permissive and nonpermissive temperatures by the DNA- mutant tsHA1 carrying a lesion in the gene specifying the major DNA-binding protein and which does not express gamma 2 genes at the nonpermissive temperature, and gC was induced only at the permissive temperature in cells infected with ts502 containing a mutation in the alpha 4 gene. The gC induced in L3153(28) cells was made earlier and processed faster to the mature form than that induced in a gC- clone of methotrexate-resistant cells infected with wild-type virus. Unlike virus stocks made in gC- cells, HSV-1(MP) made in L3153(28) cells was susceptible to neutralization by anti-gC monoclonal antibody.

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