Identification of the peptide binding motif for HLA-B44, one of the most common HLA-B alleles in the Caucasian population

Biochemistry
M DiBrinoJ E Coligan

Abstract

Most peptides that bind to a particular MHC class I molecule share amino acid residues that are thought to physically "anchor" the peptide to polymorphic pockets within the class I binding site. Sequence analysis of endogenous peptides bound to HLA-B44 revealed two potential dominant anchor residues: Glu at P2 and Tyr, or occasionally Phe, at P9. In vitro assembly assays employing synthetic peptides and recombinant HLA-B44 produced by Escherichia coli revealed that an acidic amino acid at P2 was necessary for promoting stable peptide binding to HLA-B44. Surprisingly, although Tyr was almost exclusively found at P9 of the endogenous peptide sequences, a wide variety of amino acid residues such as Leu, Ala, Arg, Lys, His, and Phe could be tolerated at this position. Using this information, we identified antigenic peptides from the influenza virus components nonstructural protein 1 and nucleoprotein that are presented by HLA-B44 to antiinfluenza type A cytotoxic T lymphocytes. In addition, cytotoxic T lymphocytes induced by these antigenic peptides were shown to be capable of recognizing endogenously processed peptides from influenza-infected cells, indicating a potential use for these peptides in vaccine development. Finally, mol...Continue Reading

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