Abstract
Immunization of BALB/c mice with vaccinia virus protein A33 (A33VACV) protects mice from intranasal challenge with the WR strain of vaccinia virus or with ectromelia virus making A33 an important candidate to be included in experimental smallpox subunit vaccines. Single vaccination with a recombinant Sindbis virus expressing A33VACV protect mice against lethal VACV-WR and ectromelia virus (ECTV) but not against the closely related cowpox virus (CPXV). Furthermore, even recombinant Sindbis virus expressing the cowpox virus A33 ortholog (A33CPXV) failed to protect either against cowpox or against VACV-WR challenge. Our attempts to map the regions which may account for this differential behavior were directed against a region of difference between the two orthologs. A stretch of 7 amino acids in A33 was mapped as important for protection which contain the following changes in A33CPXV: L112F, Q117K and L118S. This region maps to a single putative prevalent 9-mer CTL epitope with L112 as an essential anchoring residue, and a major target epitope for neutralizing antibodies encompassing L118. Vaccination with A33 harboring these individual substitutions highlighted the crucial role of L118 in induction of protective immunity.
Nir Paran and Shlomo Lustig equally contributed to the study.
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Acknowledgments
We would like to thank C. Rice from the Rockefeler University for providing us with the pTE32J plasmids, and T. Waner, Y. Shlomovich, B. Sharabi and S. Abraham for assistance with animal husbandry.
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Paran, N. et al. (2010). Role of A33R Amino-Acid 118L in the Interactions of Vaccinia Virus with the Host. In: Shafferman, A., Ordentlich, A., Velan, B. (eds) The Challenge of Highly Pathogenic Microorganisms. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9054-6_12
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DOI: https://doi.org/10.1007/978-90-481-9054-6_12
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