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J. Virol., 08 1997, 5982-5989, Vol 71, No. 8
E Kretzschmar, L Buonocore, MJ Schnell and JK Rose
We derived recombinant vesicular stomatitis virus (VSV) expressing either
influenza virus hemagglutinin (HA) or neuraminidase (NA) glycoproteins from
extra genes inserted in the viral genome. The HA protein was expressed from
a site downstream of the VSV glycoprotein (G) gene, while NA protein was
expressed from a site upstream of the VSV G gene. The HA protein was
expressed at lower levels than the VSV G protein, while the NA protein was
expressed at higher levels, as expected from the gradient of VSV
transcription that follows the gene order. The HA and NA proteins were
transported to the cell surface and were functional as demonstrated by
hemadsorption, hemolysis, and NA assays. Biochemical analysis showed that
both HA and NA proteins were incorporated into VSV particles at high
levels, although there was a preference for incorporation of the VSV G
protein over either of the influenza virus proteins. Immunoelectron
microscopy of the recombinants showed that the particles derived from the
recombinants were mosaics carrying both the VSV G protein and the influenza
virus membrane glycoproteins. These results extend earlier studies showing
incorporation of the cellular glycoprotein CD4 and two other viral
glycoproteins into VSV particles. Our results indicate that there is
significant space in the VSV membrane that can accommodate foreign membrane
proteins and that the foreign protein can represent as much as 35% of the
total protein in the viral envelope. Incorporation of foreign proteins into
VSV virions can, in many cases, occur passively in the absence of specific
incorporation signals.
Copyright © 1997, American Society for Microbiology
High-efficiency incorporation of functional influenza virus glycoproteins into recombinant vesicular stomatitis viruses
Department of Pathology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
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