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The UL20 protein of herpes simplex virus 1, an intrinsic membrane protein, is required in infected Vero cells in which the Golgi apparatus is fragmented for the transport of virions from the space between the inner and outer nuclear membranes and for the transport of fully processed cell membrane-associated glycoproteins from the trans-Golgi to the plasma membrane. It is not required in the human 143TK- cell line, in which the Golgi apparatus remains intact. We report the following. (i) The UL20 protein was detected in infected cells beginning at 6 h postinfection and was regulated as a gamma 1 gene. (ii) Pulse-chase experiments revealed no detectable alteration in the mobility of the UL20 protein in polyacrylamide gels. (iii) In both infected Vero and infected 143TK- cells, the UL20 protein was detected by immunofluorescence in association with nuclear membranes and in the cytoplasm. Some of the cytoplasmic fluorescence colocalized with beta-COP, a protein associated with Golgi-derived transport vesicles. UL20 protein was present in virions purified from the extracellular space but could not be detected in the plasma membrane. These results are consistent with the hypothesis that UL20 is a component of virion envelopes and membranes of virion transport vesicles and is selectively retained from the latter in a Golgi compartment.

Localization and putative function of the UL20 membrane protein in cells infected with herpes simplex virus 1