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Journal of Virology, September 2002, p. 8757-8768, Vol. 76, No. 17
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.17.8757-8768.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Clustering Patterns of Cytotoxic T-Lymphocyte Epitopes in Human Immunodeficiency Virus Type 1 (HIV-1) Proteins Reveal Imprints of Immune Evasion on HIV-1 Global Variation

Karina Yusim,1,2 Can Kesmir,3,4 Brian Gaschen,1 Marylyn M. Addo,5 Marcus Altfeld,5 Søren Brunak,4 Alexandre Chigaev,6 Vincent Detours,1,2 and Bette T. Korber1,2*

Los Alamos National Laboratory, Los Alamos, New Mexico 87545,1 Santa Fe Institute, Santa Fe, New Mexico 87501,2 Theoretical Biology Group, Utrecht University, 3584 CH Utrecht, The Netherlands,3 Center for Biological Sequence Analysis, BioCentrum-DTU, Technical University of Denmark, DK-2800 Lyngby, Denmark,4 Partners AIDS Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02129,5 Department of Pathology, Cancer Research and Treatment Center, University of New Mexico Health Sciences Center, Albuquerque, New Mexico 871316

Received 25 April 2002/ Accepted 21 May 2002

The human cytotoxic T-lymphocyte (CTL) response to human immunodeficiency virus type 1 (HIV-1) has been intensely studied, and hundreds of CTL epitopes have been experimentally defined, published, and compiled in the HIV Molecular Immunology Database. Maps of CTL epitopes on HIV-1 protein sequences reveal that defined epitopes tend to cluster. Here we integrate the global sequence and immunology databases to systematically explore the relationship between HIV-1 amino acid sequences and CTL epitope distributions. CTL responses to five HIV-1 proteins, Gag p17, Gag p24, reverse transcriptase (RT), Env, and Nef, have been particularly well characterized in the literature to date. Through comparing CTL epitope distributions in these five proteins to global protein sequence alignments, we identified distinct characteristics of HIV amino acid sequences that correlate with CTL epitope localization. First, experimentally defined HIV CTL epitopes are concentrated in relatively conserved regions. Second, the highly variable regions that lack epitopes bear cumulative evidence of past immune escape that may make them relatively refractive to CTLs: a paucity of predicted proteasome processing sites and an enrichment for amino acids that do not serve as C-terminal anchor residues. Finally, CTL epitopes are more highly concentrated in alpha-helical regions of proteins. Based on amino acid sequence characteristics, in a blinded fashion, we predicted regions in HIV regulatory and accessory proteins that would be likely to contain CTL epitopes; these predictions were then validated by comparison to new sets of experimentally defined epitopes in HIV-1 Rev, Tat, Vif, and Vpr.


* Corresponding author. Mailing address: HIV Sequence Database, Mail Stop K710, Los Alamos National Laboratory, Los Alamos, NM 87545. Phone: (505) 665-4453. Fax: (505) 665-3493. E-mail: btk{at}lanl.gov.


Journal of Virology, September 2002, p. 8757-8768, Vol. 76, No. 17
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.17.8757-8768.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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Copyright © 2002 by the American Society for Microbiology. All rights reserved.