Cross-neutralization of human and palm civet severe acute respiratory syndrome coronaviruses by antibodies targeting the receptor-binding domain of spike protein

The Journal of Immunology : Official Journal of the American Association of Immunologists
Yuxian HeShibo Jiang

Abstract

The spike (S) protein of severe acute respiratory syndrome coronavirus (SARS-CoV) is considered as a protective Ag for vaccine design. We previously demonstrated that the receptor-binding domain (RBD) of S protein contains multiple conformational epitopes (Conf I-VI) that confer the major target of neutralizing Abs. Here we show that the recombinant RBDs derived from the S protein sequences of Tor2, GD03, and SZ3, the representative strains of human 2002-2003 and 2003-2004 SARS-CoV and palm civet SARS-CoV, respectively, induce in the immunized mice and rabbits high titers of cross-neutralizing Abs against pseudoviruses expressing S proteins of Tor2, GD03, and SZ3. We also demonstrate that the Tor2-RBD induced-Conf I-VI mAbs can potently neutralize both human SARS-CoV strains, Tor2 and GD03. However, only the Conf IV-VI, but not Conf I-III mAbs, neutralize civet SARS-CoV strain SZ3. All these mAbs reacted significantly with each of the three RBD variants (Tor2-RBD, GD03-RBD, and SZ3-RBD) that differ at several amino acids. Regardless, the Conf I-IV and VI epitopes were completely disrupted by single-point mutation of the conserved residues in the RBD (e.g., D429A, R441A, or D454A) and the Conf III epitope was significantly affec...Continue Reading

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