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. 1995 Aug;69(8):4924–4932. doi: 10.1128/jvi.69.8.4924-4932.1995

PREPs: herpes simplex virus type 1-specific particles produced by infected cells when viral DNA replication is blocked.

D J Dargan 1, A H Patel 1, J H Subak-Sharpe 1
PMCID: PMC189307  PMID: 7609061

Abstract

Herpes simplex virus (HSV)-infected cells produce not only infectious nucleocapsid-containing virions but also virion-related noninfectious light particles (L-particles) composed of the envelope and tegument components of the virus particle (J. F. Szilágyi and C. Cunningham, J. Gen. Virol. 62:661-668, 1991). We show that BHK and MeWO cells infected either with wild-type (WT) HSV type 1 (HSV-1) in the presence of viral DNA replication inhibitors (cytosine-beta-D-arabinofuranoside, phosphonoacetic acid, and acycloguanosine) or with a viral DNA replication-defective mutant of HSV-1 (ambUL8) synthesize a new type of virus-related particle that is morphologically similar to an L-particle but differs in its relative protein composition. These novel particles we term pre-viral DNA replication enveloped particles (PREPs). The numbers of PREPs released into the culture medium were of the same order as those of L-particles from control cultures. The particle/PFU ratios of different PREP stocks ranged from 6 x 10(5) to 3.8 x 10(8), compared with ratios of 3 x 10(3) to 1 x 10(4) for WT L-particle stocks. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western immunoblot analyses revealed that true late proteins, such as 273K (VP1-2), 82/81K (VP13/14), and gC (VP8), were greatly reduced or absent in PREPs and that gD (VP17) and 40K proteins were also underrepresented. In contrast, the amounts of proteins 175K (VP4; IE3), 92/91K (VP11/12), 38K (VP22), and gE (with BHK cells) were increased. The actual protein composition of PREPs showed some cell line-dependent differences, particularly in the amount of gE. PREPs were biologically competent and delivered functional Vmw65 (VP16; alpha TIF) to target cells, but the efficiency of complementation of the HSV-1 (strain 17) mutant in1814 was 10 to 30% of that of WT L-particles.

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Selected References

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