home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9605a.zip
/
M9650355.TXT
< prev
next >
Wrap
Text File
|
1996-03-09
|
3KB
|
49 lines
Document 0355
DOCN M9650355
TI N-linked glycans in the CD4-binding domain of human immunodeficiency
virus type 1 envelope glycoprotein gp160 are essential for the in vivo
priming of T cells recognizing an epitope located in their vicinity.
DT 9605
AU Sjolander S; Bolmstedt A; Akerblom L; Horal P; Olofsson S; Morein B;
Sjolander A; Department of Veterinary Microbiology, College of
Veterinary; Medicine, Swedish University of Agricultural Sciences,
Uppsala,; Sweden.
SO Virology. 1996 Jan 15;215(2):124-33. Unique Identifier : AIDSLINE
MED/96146726
AB Deglycosylation of viral glycoproteins has been suggested to influence
the number of available T cell determinants and to increase T cell
recognition of antigens. In this study, we have investigated whether T
cell responses to the HIV-1 envelope glycoprotein gp160 were influenced
by deletion of three N-glycans of the protein. Wild type (wt) and a
mutated form of gp160 (gp160A123) lacking the three N-glycans in the
C-terminal CD4-binding region efficiently induced antigen-specific T
cell responses in mice of the H-2b, H-2d, and H-2k haplotypes. Further,
T cells primed by either wt gp160 or gp160A123 were stimulated in vitro
to a similar extent by the homologous and heterologous protein,
indicating that deletion of the glycans did not affect the overall
immunogenicity and antigenicity of gp160A123. Wild-type gp160 and
gp160A123 induced comparable T cell responses to those of epitopes which
with respect to the secondary structure of gp160 were distant from the
deleted glycans. However, in mice of the H-2b haplotype, wt gp160 primed
T cells which responded in vitro to a peptide containing one of the
deleted N-glycosylation sites (Asn448), whereas T cells induced by
gp160A123 were unable to recognize this peptide. Thus, deletion of the
glycans abrogated the in vivo priming of T cells recognizing an epitope
in close proximity to the deletion sites. Furthermore, enzymatically
deglycosylated gp160 failed to induce a T cell response to this epitope.
These results indicate that the in vivo generation of certain T cell
determinants from glycoproteins is dependent on the glycosylation of the
protein.
DE Amino Acid Sequence Animal Antigens, CD4/METABOLISM
Asparagine/IMMUNOLOGY CD4-Positive T-Lymphocytes/*IMMUNOLOGY
Epitopes/IMMUNOLOGY Female Gene Products, env/*IMMUNOLOGY
Glycosylation Human HIV-1/*IMMUNOLOGY Mice Mice, Inbred BALB C
Mice, Inbred CBA Mice, Inbred C57BL Molecular Sequence Data
Polysaccharides/*IMMUNOLOGY/METABOLISM Protein Precursors/*IMMUNOLOGY
Species Specificity Structure-Activity Relationship Support, Non-U.S.
Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).