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M9460584.TXT
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1994-06-25
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Document 0584
DOCN M9460584
TI Assembly of HIV GAG-B-galactosidase fusion proteins into virus
particles.
DT 9408
AU Wang CT; Stegeman-Olsen J; Zhang Y; Barklis E; Vollum Institute for
Advanced Biomedical Research, Oregon Health; Sciences University,
Portland 97201.
SO Virology. 1994 May 1;200(2):524-34. Unique Identifier : AIDSLINE
MED/94233715
AB We have studied the assembly of human immunodeficiency virus (HIV-1)
Gag-B-galactosidase (Gag-B-gal; GBG) fusion proteins into HIV particles
in the presence of HIV Gag proteins. Release of fusion proteins from
cells was measured by assay of media versus cellular B-gal activities
and was dependent on co-expression of unfused Gag proteins. Gag-B-gal
incorporation into virus particles was demonstrated by detergent
treatment and density gradient fractionation studies and was dependent
on protein-protein interactions requiring the C-terminal two-thirds of
the HIV CA domain. The central MA domain appeared unimportant for fusion
protein incorporation; a nonmyristylated GBG protein was incorporated
but at a relatively reduced level, while the NC and p6 domains slightly
affected the assembly of fusion proteins into particles. Subcellular
fractionation studies showed that all fusion proteins including the
nonmyristylated one were enriched in the cytoplasmic pellet fraction.
However, assembly into particles did not correlate with subcellular
fractionation patterns. Similarly, virion incorporation levels of
Gag-B-gal proteins did not correlate with their immunofluorescence
localization patterns. However, we observed that while most fusion
proteins displayed a perinuclear ring with heterogeneous staining
throughout cells, short fusion proteins appeared enriched on the
intracellular membranes, and fusion proteins with intact MA but deleted
NC domains showed an enhanced surface staining without a clear
perinuclear ring. Altogether, our data suggest that the CA domain is the
primary determinant for assembly of HIV fusion proteins into virus
particles.
DE beta-Galactosidase/ANALYSIS/METABOLISM Animal Base Sequence Cell
Compartmentation Comparative Study Gene Products,
gag/GENETICS/*METABOLISM HIV-1/*GROWTH & DEVELOPMENT Molecular
Sequence Data Morphogenesis/GENETICS Myristic Acids/METABOLISM
Protein Processing, Post-Translational Recombinant Fusion
Proteins/METABOLISM Structure-Activity Relationship Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. Transfection Virion/*GROWTH &
DEVELOPMENT JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).