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1 Institute for Animal Experimentation, School of Medicine
2 Institute of Immunological Science
and3 Graduate School of Veterinary Medicine, Hokkaido University, Japan
and4 Department of Defense Microbiology, Swedish Institute for Infectious Disease Control, Sweden
We characterized the antigenic sites on the nucleocapsid protein (NP) of Hantaan virus (HTN) using 10 monoclonal antibodies (MAbs). At least seven antigenic sites were revealed by a competitive binding assay and divided into three partially overlapping antigenic regions (I, II and III). Regions I [amino acids (aa) 1–103], II (aa 104–204) and III (aa 205–402) were mapped on NP by examining the reactivity of truncated gene products. Those that corresponded to region I reacted with immune mouse serum, indicating that the region contained major linear epitopes as reported with Four corners virus (FCV) and Puumala virus (PUU) NP. At least one MAb to each region inhibited viral growth when they were introduced into cells by scrape-loading. In addition, they conferred protection from a lethal HTN challenge to newborn mice. A PEPSCAN assay localized the epitope of MAb E5/G6 between aa 166–175. Since E5/G6, which had the highest inhibitory effect both in cells and in mice, showed no virus neutralization activity by ordinary neutralization test, this region is suggested to be important for the virus growth after entry into the cells.
* Author for correspondence. Fax +81 11 706 7879. e-mail j_arika@med.hokudai.ac.jp
Received 25 July 1995;
accepted 4 December 1995.
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