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A collection of 35 mouse monoclonal antibodies, raised against human rhinovirus 14 (HRV-14), was used to isolate 62 neutralization-resistant mutants. When cross-tested against the antibodies in a neutralization assay, the mutants fell into four antigenic groups, here called neutralization immunogens: NIm-IA, -IB, -II, and -III. Sequencing the mutant RNA in segments corresponding to serotype-variable regions revealed that the amino acid substitutions segregated into clusters, which correlated exactly with the immunogenic groups (NIm-IA mutants at VP1 amino acid residue 91 or 95; NIm-II mutants at VP2 residue 158, 159, 161, or 162; NIm-III mutants at VP3 residue 72, 75, or 78; and NIm-IB mutants at two sites, either VP1 residue 83 or 85, or residue 138 or 139). Examination of the three-dimensional structure of the virus (M. G. Rossmann, E. Arnold, J. W. Erickson, E. A. Frankenberger, J. P. Griffith, H.-J. Hecht, J. E. Johnson, G. Kamer, M. Luo, A. G. Mosser, R. R. Rueckert, B. Sherry, and G. Vriend, Nature [London], 317:145-153, 1985) revealed that each of the substitution clusters formed a protrusion from the virus surface, and the side chains of the substituted amino acids pointed outward. Moreover, four of the amino acid substitutions, which initially appeared to be anomalous because they were encoded well outside the cluster groups, could be traced to surface positions immediately adjacent to the appropriate viral protrusions. We conclude that three of the four antigens, NIm-IB, -II, and -III, are discontinuous. Thus, the amino acid substitutions in all 62 mutants fell within the proposed immunogenic sites; there was no evidence for alteration of any antigenic site by a distal mutation.

Use of monoclonal antibodies to identify four neutralization immunogens on a common cold picornavirus, human rhinovirus 14