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M94A0350.TXT
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1994-10-08
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Document 0350
DOCN M94A0350
TI Expression and purification of nonglycosylated SIV proteins, and their
use in induction and detection of SIV-specific immune responses.
DT 9412
AU Hanke T; Botting C; Green EA; Szawlowski PW; Rud E; Randall RE; School
of Biological and Medical Sciences, Division of Cell and; Molecular
Biology, University of St. Andrews, Fife, U.K.
SO AIDS Res Hum Retroviruses. 1994 Jun;10(6):665-74. Unique Identifier :
AIDSLINE MED/94355111
AB Two commercially available expression vectors were modified to generate
plasmids pGEXcPk and pQ9cPk. Proteins expressed from pGEXcPk and pQ9cPk
had a short oligopeptide tag termed Pk at their carboxy termini and
either glutathione S-transferase (GST) or a small histidine (His) tag,
respectively, at their N termini. GST fusion proteins can be purified on
immobilized glutathione and proteins coupled to the His tag selectively
bind to Ni(2+)-NTA columns. The Pk tag is recognized by monoclonal
antibody (MAb) SV5-P-k, previously produced in our laboratory. Thus
proteins expressed from the pGEXcPk and pQ9cPk vectors can be purified
in a two-step procedure, first via the N-terminal tag and second via the
C-terminal tag. The combination of two affinity purification steps
significantly improves the antigen purity and selects for full-size
proteins. Moreover, by using the MAbSV5-P-k in the second purification
step, Pk-linked antigens can be assembled directly into solid
matrix-antibody-antigen (SMAA) complexes for use as vaccines. The genes
for nef, endonuclease, p15, p17, p27, protease, Rev, reverse
transcriptase (rt), tat, vif, vpr, and vpx of simian immunodeficiency
virus (SIV mac 251) were cloned and expressed as both GST-SIV-Pk and
His-SIV-Pk proteins. Multivalent SMAA complexes were made that contained
His-p17-Pk, His-p27-Pk, His-rt-Pk, His-vpx-Pk, and His-vpr-Pk. Following
two immunizations of mice with this mixture, antibodies could be
detected to all five SIV antigens. When compared to single-protein
immunizations, the immunogenicity of some of the proteins in this
cocktail was either enhanced or decreased. Mice were also immunized with
His-p17-Pk or His-p17-Pk-antibody complexes in the presence or absence
of alum. The antibody-antigen complexes induced two- to four-fold higher
antibody levels than antigen alone but did not appear to be more
immunogenic in inducing lymphoproliferative responses. Sera from
SIV-infected macaques were tested for the presence of antibodies
reacting with the recombinant proteins by Western blot analysis.
Antibodies to endonuclease, p15, p17, p27, rt, and vif were readily
detected, antibodies against protease and vpx were present at much lower
levels, but no antibodies were detected to nef, rev, tat, or vpr. Thus,
we have developed a comprehensive range of reagents (available on
request) that can be used to examine immune responses to SIV in both
mice and monkeys.
DE Animal Antigen-Antibody Complex/IMMUNOLOGY Escherichia coli/GENETICS
Macaca Mice Plasmids Support, Non-U.S. Gov't
SIV/*CHEMISTRY/*IMMUNOLOGY Viral Fusion Proteins Viral
Proteins/GENETICS/*IMMUNOLOGY/*ISOLATION & PURIF JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).