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J. Virol., Jul 1996, 4311-4316, Vol 70, No. 7
H Browne, S Bell, T Minson and DW Wilson
Although it is generally accepted that one of the first steps of
herpesvirus egress is the acquisition of an envelope by nucleocapsids
budding into the inner nuclear membrane, later events in the pathway are
not well understood. We tested the hypothesis that the virus then undergoes
de-envelopment, followed by reenvelopment at membranes outside the
endoplasmic reticulum (ER), by constructing a recombinant virus in which
the expression of an essential glycoprotein, gH, is restricted to the inner
nuclear membrane-ER by means of the ER retention motif, KKXX. This
targeting signal conferred the predicted ER localization properties on gH
in recombinant virus-infected cells, and gH and gL polypeptides failed to
become processed to their mature forms. Cells infected with the recombinant
virus released particles with 100-fold less infectivity than those released
by cells infected with the wild-type parent virus, yet the number of
enveloped virus particles released into the medium was unaltered. These
particles contained normal amounts of gD and VP16 but did not contain
detectable amounts of gH, and these data are consistent with a model of
virus exit whereby naked nucleocapsids in the cytoplasm acquire their final
envelope from a subcellular compartment other than the ER-inner nuclear
membrane.
Copyright © 1996, American Society for Microbiology
An endoplasmic reticulum-retained herpes simplex virus glycoprotein H is absent from secreted virions: evidence for reenvelopment during egress
Division of Virology, Department of Pathology, University of Cambridge, United Kingdom.
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