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M9640654.TXT
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1996-03-04
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Document 0654
DOCN M9640654
TI Cooperative effects of the human immunodeficiency virus type 1 envelope
variable loops V1 and V3 in mediating infectivity for T cells.
DT 9604
AU Carrillo A; Ratner L; Department of Medicine, Washington University
School of Medicine,; St. Louis, Missouri 63110, USA.
SO J Virol. 1996 Feb;70(2):1310-6. Unique Identifier : AIDSLINE
MED/96135256
AB Insertion of T-cell line-tropic V3 and V4 loops from the HXB2 strain
into the macrophage-tropic YU-2 envelope resulted in a virus with
delayed infectivity for HUT78 and Jurkat cells compared with HXB2.
Sequence analysis of viral DNA derived from long-term cultures of Jurkat
cells revealed a specific mutation that changed a highly conserved Asn
residue in the V1 loop of Env to an Asp residue (N-136-->D).
Introduction of this mutation into clones containing a T-cell
line-tropic V3 loop, either with or without a T-cell line-tropic V4
loop, resulted in viruses that replicated to high levels in Jurkat cells
and peripheral blood lymphocytes. The Env proteins from these constructs
were expressed with the vaccinia virus/T7 hybrid system and were found
to be translated, processed, and cleaved and to bind to soluble CD4
similar to the wild-type HXB2 and YU-2 Env proteins. Env-mediated fusion
with HeLa T4+ cells, however, was regulated by both the altered V1 loop
and T-cell line-tropic V3 loop. These results suggest that subsequent to
the initial gp120-CD4 binding event, a functional interaction can occur
between the altered V1 loop and T-cell line-tropic V3 loop that results
in infection of Jurkat cells and peripheral blood lymphocytes.
DE beta-Galactosidase/GENETICS Amino Acid Sequence Cloning, Molecular
Gene Products, env/GENETICS Human HIV Envelope Protein
gp120/*PHYSIOLOGY HIV-1/*PHYSIOLOGY Kinetics Membrane Fusion
Molecular Sequence Data Mutation Peptide Fragments/*PHYSIOLOGY
Recombinant Fusion Proteins/GENETICS Support, Non-U.S. Gov't Support,
U.S. Gov't, P.H.S. T-Lymphocytes/*VIROLOGY Tumor Cells, Cultured
Vaccinia Virus JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).