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. 2002 May 25;271(1):182–196. doi: 10.1006/viro.2000.0310

Characterization of Murine Coronavirus Neutralization Epitopes with Phage-Displayed Peptides

Mathilde WN Yu a, Jamie K Scott b, Alain Fournier a, Pierre J Talbot a,1
PMCID: PMC3987775  NIHMSID: NIHMS26235  PMID: 10814583

Abstract

Phage-displayed peptide libraries were used to map immunologically relevant epitopes on the surface (S) glycoprotein of a neurotropic murine coronavirus (MHV-A59). Three in vitro virus-neutralizing and in vivo protective mAbs against either continuous or discontinuous epitopes on the S glycoprotein were used to screen 12 different peptide libraries expressed on the pVIII major coat protein of the fd filamentous bacteriophage. Consensus sequences that matched short sequences within the S glycoprotein were identified. The sequence of a tight-binding, mAb-selected peptide suggested the location of a discontinuous epitope within the N-terminal S1 subunit. Several tightly binding phage were amplified and used directly as immunogens in BALB/c and C57BL/6 mice. Partial protection of C57BL/6 mice against a lethal acute virus infection was achieved with a phage preparation that displayed a linear epitope. Protection correlated with the presence of sufficient levels of specific antiviral antibodies recognizing the same immunodominant domain and 13-mer peptide, located within the C-terminal S2 subunit, as the selecting mAb. Thus, the direct use of phage-displayed peptides to evaluate protective antiviral immune responses complements their use to characterize antibody-binding epitopes. This is the first evaluation of protective immunization induced by mAb-selected phage-displayed peptides.

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