Abstract
We have previously reported the synthesis in Escherichia coli of polypeptide MS2-VP8', which contains the amino-terminal half of the SA114fM VP4 protein fused to MS2 bacteriophage polymerase sequences (C. F. Arias, M. Lizano, and S. López, J. Gen. Virol. 68:633-642, 1987). In this work we have synthesized the carboxy-terminal half of the VP4 protein also fused to the MS2 polymerase. This protein, designated MS2-VP5', was recognized by sera to the complete virion and was able to induce antibodies to the virus when administered to mice; however, these antibodies had no neutralizing activity. The two chimeric polypeptides were tested for their ability to agglutinate erythrocytes and to prime the immune system of mice. Bacterial lysates enriched for the MS2-VP8' hybrid polypeptide, but not those enriched for the MS2-VP5' protein or those containing proteins from the host E. coli strain, had hemagglutinating activity. This hemagglutination was inhibited by sera to SA114fM rotavirus. In addition, a single dose of the MS2-VP8' polypeptide was able to prime the immune system of mice for an augmented neutralizing antibody response when the animals were subsequently immunized with purified SA114fM virus.
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