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Department of Molecular Biology, Centro Nacional de Microbiología, Majadahonda, 28220 Madrid, Spain
The reactivities of eighteen monoclonal antibodies with different glycosylated forms of the human respiratory syncytial (RS) virus G protein were tested in Western blots. Only five antibodies recognized the unglycosylated precursor. The majority of antibodies, however, reacted with the O-glycosylated form of the G protein, emphasizing the importance of this type of modification for the antigenicity of the mature molecule. Human antisera, which recognized the RS virus G protein in Western blots, failed to inhibit the binding of anti-G antibodies to the virus but inhibited the binding of anti-F antibodies in the same type of assay. The human antibodies, however, did not recognize the G protein of some neutralization-resistant mutants selected with one anti-G monoclonal antibody. These mutants contain drastic amino acid sequence changes in the C-terminal end of the G molecule. The results are discussed in terms of the G protein antigenic structure.
Present address: CLONTEC, S.A., Facultad de Medicina, 31080 Pamplona, Spain.
Received 24 August 1990;
accepted 20 November 1990.
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