A five-residue HIV envelope helper T cell determinant: does this peptide-MHC interaction leave the binding groove half empty?

Abstract:

:High-resolution structures have revealed major pockets in the MHC class II peptide binding groove within a region designated Pl-P9. The region can accommodate 9-mer peptides, consistent with the observation that minimal core helper T (Th) cell determinants are usually eight or nine residues in size. Here we describe mouse Th cell hybridomas that are specific for a core peptide of only five residues (NPIIL) in the HIV envelope glycoprotein. Effective Th cell stimulation requires that these MHC class II Ia(b)-presented peptides contain amino acids flanking the minimal pentamer, but the flanking residues may be located on either the N or C terminus. To explain these findings, we suggest that mini-Th cell epitopes may effectively associate with MHC when only five (or possibly fewer) of the P1-P9 positions are filled. The remaining positions may be empty, or may be associated with a second, perhaps unrelated, peptide moiety.

authors

Lockey TD,Surman S,Brown S,Slobod KS,Coleclough C,Doherty PC,Hurwitz JL

doi

10.1089/088922202320567888

subject

Has Abstract

pub_date

2002-10-10 00:00:00

pages

1141-4

issue

15

eissn

0889-2229

issn

1931-8405

journal_volume

18

pub_type

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