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J. Virol., 12 1997, 9118-9123, Vol 71, No. 12
KM Koslowski, PR Shaver, XY Wang, DJ Tenney and NE Pederson
Herpesvirus DNA is packaged into capsids in the nuclei of infected cells in
a process requiring at least six viral proteins. Of the proteins required
for encapsidation of viral DNA, UL15 and UL28 are the most conserved among
herpes simplex virus type 1 (HSV), varicella- zoster virus, and equine
herpesvirus 1. The subcellular distribution of the pseudorabies virus (PRV)
UL28 protein was examined by in situ immunofluorescence. UL28 was present
in the nuclei of infected cells; however, UL28 was limited to the cytoplasm
in the absence of other viral proteins. When cells expressing variant forms
of UL28 were infected with a PRV UL28-null mutant, UL28 entered the
nucleus, provided the carboxyl-terminal 155 amino acids were present.
Additionally, PRV UL28 entered the nucleus in cells infected with HSV. Two
HSV packaging proteins were tested for the ability to affect the
subcellular distribution of UL28. Coexpression of HSV UL15 enabled PRV UL28
to enter the nucleus in a manner that required the carboxyl- terminal 155
amino acids of UL28. Coexpression of HSV UL25 did not affect the
distribution of UL28. We propose that an interaction between UL15 and UL28
facilitates the transport of a UL15-UL28 complex to the infected-cell
nucleus.
Copyright © 1997, American Society for Microbiology
The pseudorabies virus UL28 protein enters the nucleus after coexpression with the herpes simplex virus UL15 protein
Department of Microbiology and Immunology, East Carolina University School of Medicine, Greenville, North Carolina 27858-4354, USA.
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