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. 1992 Jan;66(1):440–447. doi: 10.1128/jvi.66.1.440-447.1992

Comparative analysis of core amino acid residues of H-2D(b)-restricted cytotoxic T-lymphocyte recognition epitopes in simian virus 40 T antigen.

A M Deckhut 1, J D Lippolis 1, S S Tevethia 1
PMCID: PMC238304  PMID: 1370091

Abstract

Simian virus 40 (SV40) tumor (T) antigen expressed in H-2b SV40-transformed cells induces the generation of Lyt-2+ (CD8+) cytotoxic T lymphocytes (CTL), which are involved in tumor rejection, in syngeneic mice. Five CTL recognition sites on T antigen have been described by using mutant T antigens. Four of the sites (I, II, III, and V) are H-2Db restricted and have been broadly mapped with synthetic peptides of 15 amino acids in length overlapping by 5 residues at the amino and carboxy termini. The goal of this study was to define the minimal and optimal amino acid sequences of T antigen which would serve as recognition elements for the H-2Db-restricted CTL clones Y-1, Y-2, Y-3, and Y-5, which recognizes sites I, II, III, and V, respectively. The minimal and optimal residues of T antigen recognized by the four CTL clones were determined by using synthetic peptides truncated at the amino or carboxy terminus and an H-2Db peptide-binding motif. The minimal site recognized by CTL clone Y-1 was defined as amino acids 207 to 215 of SV40 T antigen. However, the optimal sequence recognized by CTL clone Y-1 spanned T-antigen amino acids 205 to 215. The T-antigen peptide sequence LT223-231 was the optimal and minimal sequence recognized by both CTL clones Y-2 and Y-3. Site V was determined to be contained within amino acids 489 to 497 of T antigen. The lytic activities of CTL clones Y-2 and Y-3, which recognize a single nonamer peptide, LT223-231, were affected differently by anti-Lyt-2 antibody, suggesting that the T-cell receptors of these two CTL clones differ in their avidities. As the minimal and optimal H-2Db-restricted CTL recognition sites have been defined by nonamer synthetic peptides, it is now possible to search for naturally processed H-2Db-restricted epitopes of T antigen and identify critical residues involved in processing, presentation, and recognition by SV40-specific CTL.

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Selected References

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