Journal of Virology, March 2000, p. 2481-2487, Vol. 74, No. 5
Department of Molecular Genetics and
Biochemistry, University of Pittsburgh School of Medicine,
Pittsburgh, Pennsylvania 15261
Received 30 September 1999/Accepted 24 November 1999
The use of herpes simplex virus (HSV) vectors for in vivo gene
therapy will require the targeting of vector infection to specific cell
types in certain in vivo applications. Because HSV glycoprotein D (gD)
imparts a broad host range for viral infection through recognition of
ubiquitous host cell receptors, vector targeting will require the
manipulation of gD to provide new cell recognition specificities in a
manner designed to preserve gD's essential role in virus entry. In
this study, we have determined whether an entry-incompetent HSV mutant
with deletions of all Us glycoproteins, including gD, can be
complemented by a foreign attachment/entry protein with a different
receptor-binding specificity, the vesicular stomatitis virus
glycoprotein G (VSV-G). The results showed that transiently expressed
VSV-G was incorporated into gD-deficient HSV envelopes and that the
resulting pseudotyped virus formed plaques on gD-expressing VD60 cells,
albeit at a 50-fold-reduced level compared to that of wild-type gD.
This reduction may be related to differences in the entry pathways used
by VSV and HSV or to the observed lower rate of incorporation of VSV-G
into virus envelopes than that of gD. The rate of VSV-G incorporation
was greatly improved by using recombinant molecules in which the
transmembrane domain of HSV glycoprotein B or D was substituted for
that of VSV-G, but these recombinant molecules failed to promote virus entry. These results show that foreign glycoproteins can be
incorporated into the HSV envelope during replication and that gD can
be dispensed with on the condition that a suitable attachment/entry
function is provided.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Pseudotyping of Glycoprotein D-Deficient Herpes
Simplex Virus Type 1 with Vesicular Stomatitis Virus Glycoprotein G
Enables Mutant Virus Attachment and Entry

*
Corresponding author. Mailing address: Department of
Molecular Genetics and Biochemistry, University of Pittsburgh School of
Medicine, E1240 Biomedical Science Tower, Pittsburgh, PA 15261. Phone:
(412) 648-8106. Fax: (412) 624-8997. E-mail:
glorioso+{at}pitt.edu.
Present address: Onyx Pharmaceuticals, Richmond, CA 94806.
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