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. 1995 Feb;69(2):825–833. doi: 10.1128/jvi.69.2.825-833.1995

The herpes simplex virus 1 UL11 proteins are associated with cytoplasmic and nuclear membranes and with nuclear bodies of infected cells.

J D Baines 1, R J Jacob 1, L Simmerman 1, B Roizman 1
PMCID: PMC188648  PMID: 7815549

Abstract

Earlier studies have shown that the UL11 gene of herpes simplex virus encodes a myristylated virion protein and that the UL11 gene enables efficient virion envelopment and export from infected cells. A rabbit polyclonal antibody directed against an affinity-purified UL11-glutathione-S-transferase fusion protein was made and used to study the properties of the UL11 protein and its distribution in infected cells. We report the following: (i) UL11 protein formed up to five bands (apparent M(r)s, 17,000 to 22,000) in denaturing polyacrylamide gels; (ii) fluorescent-antibody studies revealed the presence of UL11 protein in the perinuclear space and in sites within the nucleus; (iii) immune electron microscopic studies indicated that the UL11 gene products were associated with the inner nuclear membrane, with cytoplasmic membranes and ribbon-like cytoplasmic structures resembling membranous organelles, with nuclear bodies shown by fluorescence microscopy to be different from nucleoli in which US11 protein accumulates, and with enveloped virions but not with nuclear capsids; and (iv) the nuclear bodies containing UL11 protein were reminiscent both of type IV morphotypes consisting of an electron-dense core containing the UL11 proteins surrounded by a more electron-transluscent core and of type V morphotypes consisting of material homogenous in electron opacity. We conclude that (i) the UL11 protein is processed after synthesis; (ii) the localization of UL11 protein with virions and membranes is consistent with the hypothesis that UL11 plays a role in the transport of virions to the extracellular space; and (iii) although the significance of the association of UL11 proteins with nuclear bodies is unknown, the results indicate that nuclear bodies differ with respect to their morphologies and contents of viral protein and suggest that UL11 protein may have more than one function in the infected cell.

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Selected References

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