Redistribution of cellular and herpes simplex virus proteins from the trans-golgi network to cell junctions without enveloped capsids.
Herpes simplex virus (HSV) and other alphaherpesviruses assemble enveloped virions in the trans-Golgi network (TGN) or endosomes. Enveloped particles are formed when capsids bud into TGN/endosomes and virus particles are subsequently ferried to the plasma membrane in TGN-derived vesicles. Little is known about the last stages of virus egress from the TGN/endosomes to cell surfaces except that the HSV directs transport of nascent virions to specific cell surface domains, i.e., epithelial cell junctions. Previously, we showed that HSV glycoprotein gE/gI accumulates extensively in the TGN at early times after infection and also when expressed without other viral proteins. At late times of infection, gE/gI and a cellular membrane protein, TGN46, were redistributed from the TGN to epithelial cell junctions. We show here that gE/gI and a second glycoprotein, gB, TGN46, and another cellular protein, carboxypeptidase D, all moved to cell junctions after infection with an HSV mutant unable to produce cytoplasmic capsids. This redistribution did not involve L particles. In contrast to TGN membrane proteins, several cellular proteins that normally adhere to the cytoplasmic face of TGN, Golgi, and endosomal membranes remained primarily dispersed throughout the cytoplasm. Therefore, cellular and viral membrane TGN proteins move to cell junctions at late times of HSV infection when the production of enveloped particles is blocked. This is consistent with the hypothesis that there are late HSV proteins that reorganize or redistribute TGN/endosomal compartments to promote virus egress and cell-to-cell spread.
Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Mail code L-220, 3181 SW Sam Jackson Park Rd., Portland, OR 97239, USA.
Todd W
TW
Wisner
David C
DC
Johnson
D002478:Cells, Cultured; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D007365:Intercellular Junctions / Q000378:metabolism*; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D019251:Nucleocapsid / Q000502:physiology*; D021381:Protein Transport; D011506:Proteins / Q000378:metabolism; D014759:Viral Envelope Proteins / Q000378:metabolism*; D021601:trans-Golgi Network / Q000378:metabolism*; D052118:Lysosomal-Associated Membrane Protein 1
D006023:Glycoproteins; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D011506:Proteins; D014759:Viral Envelope Proteins; C489116:LAMP1 protein, human; D052118:Lysosomal-Associated Membrane Protein 1; C072237:TGOLN2 protein, human; C040495:glycoprotein B, Simplexvirus; C044768:glycoprotein E, herpes simplex virus type 1; C064959:glycoprotein I, herpes simplex virus type 1; C094315:metallocarboxypeptidase D