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M9620402.TXT
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1996-02-26
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Document 0402
DOCN M9620402
TI p6Gag is required for particle production from full-length human
immunodeficiency virus type 1 molecular clones expressing protease.
DT 9602
AU Huang M; Orenstein JM; Martin MA; Freed EO; Laboratory of Molecular
Microbiology, National Institute of; Allergy and Infectious Diseases,
NIH, Bethesda, MD 20892-0460,; USA.
SO J Virol. 1995 Nov;69(11):6810-8. Unique Identifier : AIDSLINE
MED/96013776
AB The human immunodeficiency virus type 1 (HIV-1) Gag protein precursor,
Pr55Gag, contains at its C-terminal end a proline-rich, 6-kDa domain
designated p6. Two functions have been proposed for p6: incorporation of
the HIV-1 accessory protein Vpr into virus particles and virus particle
production. To characterize the role of p6 in the HIV-1 life cycle and
to map functional domains within p6, we introduced a number of nonsense
and single and multiple amino acid substitution mutations into p6.
Following the introduction of the mutations into the full-length HIV-1
molecular clone pNL4-3, the effects on Gag protein expression and
processing, virus particle production, and virus infectivity were
analyzed. The production of mutant virus particles was also examined by
transmission electron microscopy. The results indicate that (i) p6 is
required for efficient virus particle production from a full-length
HIV-1 molecular clone; (ii) a Pro-Thr-Ala-Pro sequence, located between
residues 7 and 10 of p6, is critical for virus particle production;
(iii) mutations outside the Pro-Thr-Ala-Pro motif have little or no
effect on virus assembly and release; (iv) the p6 defect is manifested
at a late stage in the budding process; and (v) mutations in p6 that
severely reduce virion production in HeLa cells also block or
significantly delay the establishment of a productive infection in the
CEM (12D-7) T-cell line. We further demonstrate that mutational
inactivation of the viral protease reverses the p6 defect, suggesting a
functional linkage between p6 and the proteolytic processing of the Gag
precursor protein during the budding of progeny virions.
DE Amino Acid Sequence Capsid/BIOSYNTHESIS Cell Line Cloning, Molecular
Gene Products, gag/BIOSYNTHESIS/*METABOLISM Gene Products,
vpr/METABOLISM Genes, pol Hela Cells Human HIV
Protease/*BIOSYNTHESIS HIV-1/ENZYMOLOGY/*PHYSIOLOGY/ULTRASTRUCTURE
Kinetics Microscopy, Electron Molecular Sequence Data Mutagenesis,
Site-Directed Point Mutation Recombinant Proteins/METABOLISM Time
Factors Transfection *Virus Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).