home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9602.ZIP
/
M9621034.TXT
< prev
next >
Wrap
Text File
|
1996-02-26
|
3KB
|
48 lines
Document 1034
DOCN M9621034
TI Seroreactivity of analogous antigenic epitopes in glycoprotein 120
expressed in HIV-1 subtypes A, B, C, and D.
DT 9602
AU Pestano GA; Hosford KS; Spira AI; Riley J; Xie JM; Sewankambo N; Brown
L; Ho DD; Boto WM; Department of Biology, City College of the City
University of New; York, New York 10031, USA.
SO AIDS Res Hum Retroviruses. 1995 May;11(5):589-96. Unique Identifier :
AIDSLINE MED/96093894
AB This article describes the impact of sequence variation on the
distribution and seroreactivity of linear antigenic epitopes in gp120
encoded in new Ugandan HIV-1 clones from subtypes A, C, and D, and in
North American clones from the B subtype. A region of the env gene
encoding the C2 to V5 domains was PCR amplified from the lysates of
peripheral blood leukocytes or from short-term cultured isolates.
Computer-assisted analyses were conducted on the amino acid sequences to
determine the distribution of surface structures in gp120. Despite
marked sequence diversity, eight analogous epitopes were predicted for
all clades of the virus analyzed. Synthetic peptides comprising the
putative principal neutralizing determinant E2[V3], and other B cell
epitopes E3[V3-V4], E4[V3-V4], E7[C3], and E8[V5], from a seroprevalent
Ugandan isolate, AUG06c, were tested in ELISA for antigenicity with sera
from Uganda, New York, and Thailand. Variable magnitudes of
seroreactivity were observed for all of the peptides tested. However, a
significantly higher degree of serum cross-reactivity was detected with
the V3 loop peptide. ELISA reactivities of the same serum panel
indicated that V3 loop peptides containing the apical residues GPGR
(clones AUG06c and BRT3) or GPGQ (CUG045 and DUG044) were more antigenic
and display extensive cross-reactivity as compared to analogous peptides
comprising GLGQ (DUG23c), GQGQ (DUG042), or GPWG (BRT1). BETATURN
analysis of the divergent V3 loop apical residues showed a good
correlation of probable beta-turn occurrence with strong seroreactivity.
These findings suggest that the major antigenic specificities in the
divergent clades of HIV-1 are well conserved.(ABSTRACT TRUNCATED AT 250
WORDS)
DE Amino Acid Sequence Antigenic Variation Epitopes/GENETICS/*IMMUNOLOGY
Genes, env Human HIV Antigens/GENETICS/*IMMUNOLOGY HIV Envelope
Protein gp120/GENETICS/*IMMUNOLOGY HIV Seropositivity/BLOOD/VIROLOGY
HIV-1/CLASSIFICATION/GENETICS/*IMMUNOLOGY Molecular Sequence Data New
York Peptide Fragments/IMMUNOLOGY Sequence Homology, Amino Acid
Support, Non-U.S. Gov't Support, U.S. Gov't, Non-P.H.S. Support, U.S.
Gov't, P.H.S. Thailand Uganda JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).