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J Virol. 1991 July; 65(7): 3475-3480

Mapping of a neutralizing antigenic site of Coxsackievirus B4 by construction of an antigen chimera.

Max-Planck-Institut für Biochemie, Martinsried, Federal Republic of Germany.

ABSTRACT

A neutralizing antigenic site of coxsackievirus B4 (CVB4) was identified by construction of an antigen chimera between coxsackievirus B3 (CVB3) and CVB4. This chimera, designated CVB3/4, was constructed by inserting five amino acids of the putative BC loop of the structural protein VP1 of CVB4 into the corresponding loop of CVB3 by site-directed mutagenesis of infectious recombinant CVB3 cDNA. The chimeric cDNA was capable of inducing an infectious cycle upon transfection of permissive host cells. The resulting chimeric virus CVB3/4 was neutralized and precipitated by CVB4 and CVB3 serotype-specific polyclonal antisera, demonstrating that it unifies antigenic properties of both coxsackievirus serotypes. In addition, the chimera elicited antibodies in rabbits which were capable of neutralizing the two coxsackievirus serotypes CVB3 and CVB4. The insertion of the CVB4-specific antigenic site into the BC loop of CVB3 reduces the efficiency of viral replication, resulting in a small-plaque morphology of the virus chimera. In summary, these data give evidence for the presence of a serotype-specific neutralizing antigenic site in the BC loop of VP1 of CVB4 (amino acids 81 to 89). Our findings suggest that the construction of intertypic chimeras can be used as a tool for the identification of antigenic sites of coxsackieviruses. The retained immunogenicity of the mapped CVB4-specific antigenic epitope, when expressed in CVB3, indicates that CVB3 can be used as a RNA virus vector for heterologous antigenic sites.

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