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. 1996 Apr;70(4):2632–2636. doi: 10.1128/jvi.70.4.2632-2636.1996

Analysis of the receptor-binding site of murine coronavirus spike protein.

H Suzuki 1, F Taguchi 1
PMCID: PMC190114  PMID: 8642698

Abstract

It has been found that a domain composed of 330 amino acids of the N terminus of murine coronavirus spike protein [S1N(330)] is involved in receptor-binding activity (H. Kubo, Y.K. Yamada, and F. Taguchi, J. Virol. 68:5403-5410, 1994). To delineate the amino acid sequences involved in receptor-binding activity, we have compared the S1N(330) proteins of seven different mouse hepatitis virus MHV strains that are able to utilize the MHV receptor protein. Three conserved regions (sites I, II, and III) were found to consist of more than 10 identical amino acids, and they were analyzed for receptor-binding activity by site-directed mutagenesis. S1N(330) with a substitution at position 62 from the N terminus of S1 in region I and that with substitutions at positions 212, 214, and 216 in region II showed no receptor-binding activity. The S1N(330) mutants without receptor-binding activity were not able to prevent virus binding to the receptor. These results suggest that the receptor-binding site on S1N(330) is composed of regions located apart from each other in the protein's primary structure, in which Thr at position 62 as well as amino acids located at positions 212, 214, and 216 are particularly important.

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Selected References

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