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The cytotoxic T-lymphocyte (CTL) response to lymphocytic choriomeningitis virus infection determines the outcome of infection. Here we show that this response in BALB/c mice (H-2d), when analyzed both at the primary CTL level and using CTL clones, is predominantly monospecific. The vast majority of CTL have a common specificity for a single epitope in the virus nucleoprotein, which can be minimally identified by amino acids GVYMG. This epitope is presented by the Ld class I glycoprotein. We used these data to design a subunit CTL vaccine, whose effectiveness is demonstrated in the accompanying report (L. S. Klavinskis, J. L. Whitton, and M. B. A. Oldstone, J. Virol. 63:4311-4316, 1989). Further analysis indicates that, while CTL clones share a common minimal epitope, they differ in their ability to recognize cells infected with a related but distinct strain of lymphocytic choriomeningitis virus. Studies on the molecular nature of CTL cross-reactivity indicate that CTL induced by similar sequences may cross-react in a unidirectional manner. These novel observations suggest that CTL vaccines, to achieve optimal effectiveness, should not simply include virus sequences which will yield a CTL response; the immunizing sequences should also be selected to ensure that the fine specificities of the induced CTL are such that they maximize the chance of recognizing serotypically diverse strains.

journal of virology

Molecular analyses of a five-amino-acid cytotoxic T-lymphocyte (CTL) epitope: an immunodominant region which induces nonreciprocal CTL cross-reactivity