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Journal of Neuroscience Research 1996-Sep

Variation in H-2K(k) peptide motif revealed by sequencing naturally processed peptides from T-cell hybridoma class I molecules.

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G G Burrows
K Ariail
B Celnik
J E Gambee
B F Bebo
H Offner
A A Vandenbark

Märksõnad

Abstraktne

Class I major histocompatibility complex (MHC) molecules interact with a diverse array of self and foreign peptides, displaying them on the cell surface and providing an extracellular indication of intracellular invasion. The most clearly defined role for these class I/peptide complexes is to cause effector responses upon binding to antigen-specific receptors of cytotoxic T cells. We have characterized the mouse thymoma/rat V beta 8.2+ T-cell hybridoma C14/BW12-12A1 by fluorescence-activated cell sorting analysis and have used immunoaffinity chromatography to purify class I molecules from these cells. The peptides bound to the class I molecules were fractionated by high-performance liquid chromatography and sequenced. Self-peptide mixtures eluted from the mouse H-2Kk class I allele revealed a dominant primary sequence motif, with a carboxyl-terminal residue that appeared to be invariantly valine and a secondary or auxiliary anchor residue at position 2 that could be either glutamate or proline. The majority of naturally processed peptide ligands appeared to be octamers. Although peptides eluted off H-2Kk molecules from tissue derived from a number of different inbred mouse strains also appeared to be octamers, others have reported that isoleucine is the dominant carboxyl-terminal residue. Thus, different cell types displayed distinct differences in naturally processed peptides bound by the same class I alleles. The variation in naturally processed peptides loaded onto the same class I allele most likely reflects the nature of the pool of peptides within the cell available for loading class I molecules.

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