Abstract
The mechanism of intracellular maturation and sorting of herpes simplex virus type I glycoproteins is not known in details. To elucidate the intracellular sorting of viral glycoproteins and their possible interaction with the cytoskeleton, a method for simultaneous immunogold staining of three antigens in ultrathin cryosections is described. Each antigen is stained by an indirect technique using mouse monoclonal IgG as first layer, rabbit anti-mouse IgG as second and gold-conjugated goat anti-rabbit IgG as third layer antibody. After each staining cycle the sections are covered by methyl cellulose and exposed to paraformaldehyde vapour at 80 degrees C for 30 min. This destroys the free antigen combining sites of the second and the third layer IgG and abolish contaminating staining. Simultaneous triple-staining is documented with three mouse monoclonal antisera specific for 1) herpes simplex virus type 1 glycoprotein C, 2) glycoprotein D and 3) alpha- and beta-tubulin as primary antibodies. Labelling for virus glycoproteins was found in some Golgi vesicles and close to the cytoplasmic microtubules as well as on the cell surface and on intracytoplasmic and extracellular virus particles.
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