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The use of the simian immunodeficiency virus (SIV) macaque model for assessing human immunodeficiency virus vaccine strategies will be facilitated by the characterization of predominant SIV cytotoxic T-lymphocyte (CTL) epitopes and their restricting major histocompatibility complex (MHC) class I molecules in macaque species. We now define a rhesus monkey SIVmac CTL epitope in the third hypervariable region of the envelope glycoprotein of the virus. This epitope, YNLTMKCR, contains the first two amino acids of a cysteine-cysteine loop which is the SIVmac analog of the human immunodeficiency virus type 1 V3 loop. We also employed one-dimensional isoelectric focusing to characterize the MHC class I molecule of the rhesus monkey that binds this SIVmac envelope peptide fragment. Cloning and sequencing the cDNA encoding this rhesus monkey MHC class I molecule demonstrates that it is a newly described HLA-A homolog, Mamu-A*02. This viral CTL epitope and its restricting MHC class I molecule will facilitate the use of the SIVmac rhesus monkey model for studies of envelope-based vaccine strategies and for exploring AIDS immunopathogenesis.

journal of virology

A simian immunodeficiency virus envelope V3 cytotoxic T-lymphocyte epitope in rhesus monkeys and its restricting major histocompatibility complex class I molecule Mamu-A*02