Previous Article | Next Article ![]()
Journal of Virology, July 2001, p. 6166-6172, Vol. 75, No. 13
The Marjorie B. Kovler Viral Oncology
Laboratories, The University of Chicago, Chicago, Illinois 60637
Received 26 February 2001/Accepted 29 March 2001
An earlier report showed that viruses lacking the open
reading frames encoding glycoproteins J and D but containing the
glycoprotein D in their envelopes (gD
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.13.6166-6172.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
The Domains of Glycoprotein D Required To Block
Apoptosis Depend on Whether Glycoprotein D Is Present in the
Virions Carrying Herpes Simplex Virus 1 Genome Lacking the Gene
Encoding the Glycoprotein
/+ stocks) and viruses lacking
both the open reading frames and the glycoproteins in their envelopes
(gD
/
stocks) induce apoptosis (G. Zhou, V. Galvan, G. Campadelli-Fiume, and B. Roizman, J. Virol. 74:11782-11791,
2000). Furthermore, apoptosis was blocked by delivery in
trans of genes expressing glycoprotein D or J. Whereas
gD
/
stocks attach but cannot initiate productive infection, gD
/+
stocks infect cells and produce gD
/
progeny virus. The difference
in the infectivity of these two stocks suggested the possibility that
the requirements for blocking apoptosis may be different. To test this
hypothesis, we cloned into baculoviruses the entire wild-type
glycoprotein D (Bac-gD-WT), the ectodomain only (Bac-gD-A), the
ectodomain and the transmembrane domain (Bac-gD-B), the ectodomain and
the cytoplasmic domain without the transmembrane domain (Bac-gD-C), or
the transmembrane domain and the carboxyl-terminal cytoplasmic domain
(Bac-gD-D). We report the following. Apoptosis induced by gD
/+ stocks
was blocked by delivery in trans of recombinant
baculovirus Bac-gD-WT, Bac-gD-A, Bac-gD-B, or Bac-gD-C but not of
Bac-gD. Apoptosis induced by gD
/
stocks was blocked by Bac-gD-WT or
by a mixture of Bac-gD-B and Bac-gD-D but not by any baculoviruses
expressing truncated glycoprotein D alone or by the mixture of Bac-gD-A
and Bac-gD-D. We conclude that the requirements to block apoptosis
induced by the two virus stocks are different. The gD ectodomain is
sufficient to block apoptosis induced by gD, whereas both the
ectodomain and the cytoplasmic domain are required to block apoptosis
induced by gD
/
stocks. The results indicate that in the case of
gD
/
stocks, the transmembrane domain is required either to deliver the ectodomain to the appropriate intracellular compartment or to form
multimeric constructs which virtually reconstitute gD through the
interaction of transmembrane domains.
*
Corresponding author. Mailing address: The Marjorie B. Kovler Viral Oncology Laboratories, The University of Chicago, 910 E. 58th St., Chicago, IL 60637. Phone: (773) 702-1898. Fax: (773) 702-1631. E-mail: bernard{at}cummings.uchicago.edu.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»