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Journal of Virology, June 2000, p. 5291-5299, Vol. 74, No. 11
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

HLA-B57-Restricted Cytotoxic T-Lymphocyte Activity in a Single Infected Subject toward Two Optimal Epitopes, One of Which Is Entirely Contained within the Other

Philip J. R. Goulder,1,2,* Yanhua Tang,1 Stephen I. Pelton,3 and Bruce D. Walker1

Partners AIDS Research Center, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts 02129,1 Division of Infectious Diseases, The Children's Hospital, Boston, Massachusetts 02115,2 and Section of Pediatric Infectious Diseases, Boston Medical Center, Boston, Massachusetts 021183

Received 24 November 1999/Accepted 29 February 2000

Viral peptides are recognized by cytotoxic T lymphocytes (CTL) as a complex with major histocompatibility complex (MHC) class I molecules, but the extent to which a single HLA allele can accommodate epitope peptides of different length and sequence is not well characterized. Here we report the identification of clonal CTL responses from the same donor that independently recognize one of two HLA-B57-restricted epitopes, KAFSPEVIPMF (KF11; p24Gag residues 30 to 40) and KAFSPEVI (KF8; p24Gag residues 30 to 37). Although lysis studies indicated that the KF11 peptide stabilized the HLA-B57-peptide complex more efficiently than the KI8 peptide, strong clonal responses were directed at each epitope. In samples from a second donor, the same phenomenon was observed, in which distinct CTL clones recognized peptide epitopes presented by the same HLA class I allele (in this case, HLA-A3) which were entirely overlapping. These data are relevant to the accurate characterization of CTL responses, which is fundamental to a detailed understanding of MHC class I-restricted immunity. In addition, these studies demonstrate marked differences in the length of peptides presented by HLA-B57, an allele which is associated with nonprogressive human immunodeficiency virus infection.

* Corresponding author. Mailing address: Partners AIDS Research Center, Massachusetts General Hospital, 13th St., Bldg. 149, Rm. 5218, Charlestown, MA 02129. Phone: (617) 726-5787. Fax: (617) 726-5411. E-mail: goulder{at}helix.mgh.harvard.edu.

Journal of Virology, June 2000, p. 5291-5299, Vol. 74, No. 11
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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