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M9621037.TXT
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1996-02-26
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Document 1037
DOCN M9621037
TI Characterization of V3 loop-binding protein(s) of Molt-4 and U937 cells.
DT 9602
AU Xu Y; Murakami T; Kawase S; Uchiyama T; Hattori T; Laboratory for AIDS
Immunology, Kyoto University, Japan.
SO AIDS Res Hum Retroviruses. 1995 May;11(5):563-70. Unique Identifier :
AIDSLINE MED/96093891
AB The V3 loop in gp120 of human immunodeficiency virus type 1 (HIV-1) is
known as a principal neutralizing and cell-tropic determinant.
Biotinylated synthetic V3 loop peptides derived from three different
HIV-1 strains were used as ligands to identify the cell surface
counterreceptor, which may participate in the infection of HIV-1. Two
different cell lines, Molt-4 and U937, and three V3 loop peptides
derived from LAVELI, HTLV-IIIMN, and HTLV-IIIB strains were used. The
binding of HTLV-IIIB-derived peptide to the cell surface was confirmed
using 125I-labeled surface proteins of both cell lines. The relative
molecular mass of the major radioactive band on the autoradiogram was
32-33 kDa in both cell lines. A protein was purified from the plasma
membrane fraction of Molt-4 cells using affinity columns coupled with
three different V3 loop peptides. Two major polypeptides (32 and 33 kDa)
were eluted from the affinity column. Size-exclusion chromatography
showed that the protein migrated as a single peak with a molecular mass
of 130 kDa. These proteins were separated by reversed-phase
chromatography, which indicated that the 32-kDa protein is more
hydrophobic than the 33-kDa protein in Molt-4 cells. A similar but not
identical 130-kDa protein with 32- and 33-kDa polypeptides were also
purified from U937 cells. These findings indicate that HIV-1 utilizes a
tetrameric protein on the surface of Molt-4 and U937 cells on infection.
DE Amino Acid Sequence Chromatography, Affinity Chromatography, High
Pressure Liquid CD4-Positive T-Lymphocytes/METABOLISM/VIROLOGY Human
HIV Envelope Protein gp120/*METABOLISM HIV-1/*METABOLISM Molecular
Sequence Data Peptide Fragments/*METABOLISM Protein Binding
Receptors, HIV/ISOLATION & PURIF/*METABOLISM Support, Non-U.S. Gov't
Tumor Cells, Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).