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Document 0169
DOCN M9650169
TI Stereochemical analysis of the antigenic tip of the V3 loop peptide of
HIV-1 gp120.
DT 9605
AU Gunasekaran K; Ramakrishnan C; Balaram P; Molecular Biophysics Unit,
Indian Institute of Science,; Bangalore, India.
SO Int J Pept Protein Res. 1995 Nov;46(5):359-65. Unique Identifier :
AIDSLINE MED/96139684
AB A novel multiple turn conformation has been observed for a segment
GPGRAFY in the crystal structure of a complex of HIV-1 gp120 V3 loop
peptide with the Fab fragment of a neutralizing antibody [Ghiara et al.
(1994) Science 264, 82-85]. A structural motif has been defined for the
peptide segment, employing idealized backbone conformations
characterized by ranges of virtual C alpha torsion angles and bond
angles. A search of 122 high-resolution protein crystal structures has
permitted identification of 24 examples of similar structural motifs.
Two major conformational families have been identified, which differ
primarily in the conformation at residue 3. The observed conformation at
residue 3 in family 1 is left-handed helical (alpha L) and that in
family 2 is right-handed helical (alpha R). Of the 10 examples in family
1, 9 examples have Gly residues at position 3. Of the 12 examples in
family 2, 7 examples have Asn/Asp at position 3. Computer modeling of
the V3 loop tip sequence using the two backbone conformational families
as starting points leads to minimum-energy conformations in which
antigenically important side-chains occupy similar spatial arrangements.
This stereochemical analysis of the V3 loop tip sequence suggests a
rational basis for the design of synthetic analog peptides for use as
viral antagonists or synthetic antigens.
DE Amino Acid Sequence Antigens, Viral/*CHEMISTRY Crystallization
Hydrogen Bonding HIV Envelope Protein gp120/*CHEMISTRY
HIV-1/*CHEMISTRY Models, Molecular Molecular Sequence Data *Protein
Conformation Protein Structure, Secondary 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).