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M9630043.TXT
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1996-02-27
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Document 0043
DOCN M9630043
TI Assembly of SIV virus-like particles containing envelope proteins using
a baculovirus expression system.
DT 9603
AU Yamshchikov GV; Ritter GD; Vey M; Compans RW; Department of Microbiology
and Immunology, Emory University; School of Medicine, Atlanta, Georgia
30322, USA.
SO Virology. 1995 Dec 1;214(1):50-8. Unique Identifier : AIDSLINE
MED/96095223
AB The requirements for SIV particle assembly and envelope incorporation
were investigated using a baculovirus expression system. The Pr56gag
precursor protein expressed under control of the polyhedrin promoter
(pPolh) produced high levels of immature retrovirus-like particles (VLP)
upon expression in Sf9 insect cells. To determine the optimal conditions
for envelope protein (Env) incorporation into VLP, two recombinant
baculoviruses expressing the SIV envelope protein under control of a
very late pPolh or a hybrid late/very late capsid/polyhedrin (Pcap/polh)
promoter and a recombinant expressing a truncated form of the SIV
envelope protein (Envt) under the hybrid Pcap/polh promoter were
compared. We have observed that utilization of the earlier hybrid
promoter resulted in higher levels of Env expression on the cell surface
and its incorporation into budding virus particles. We have also found
that the Envt protein is transported to the cell surface of insect cells
and incorporated into VLP more efficiently than full-length Env. In
addition, we examined the effect of coexpression of the protease furin,
which has been implicated in the proteolytic cleavage of the Env
precursor gp160 in mammalian cells. Coexpression of furin in insect
cells resulted in more efficient proteolytic cleavage into gp120 and
gp41, and the cleaved proteins were incorporated into VLP.
DE Animal Base Sequence Cell Line DNA Primers Gene Products,
env/METABOLISM Gene Products, gag/GENETICS/METABOLISM Genetic Vectors
HIV Envelope Protein gp120/METABOLISM Molecular Sequence Data Nuclear
Polyhedrosis Virus/GENETICS Protein Precursors/METABOLISM Spodoptera
Subtilisins/METABOLISM Support, Non-U.S. Gov't Support, U.S. Gov't,
P.H.S. SIV/*PHYSIOLOGY/ULTRASTRUCTURE Viral Envelope
Proteins/GENETICS/*METABOLISM Virion/*PHYSIOLOGY *Virus Assembly
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).