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The immunological activity of a deletion mutant of influenza virus haemagglutinin lacking the globular region

¹ Biotechnology Research Laboratories, Takara Shuzo Co., Ltd, 3-4-1 Seta, Otsu, Shiga 520-21, Japan
² Laboratory of Virology, Osaka Prefecture Institute of Public Health, 3-69 Nakamichi 1-Chome, Higashinari-ku Osaka 537, Japan
³ Department of Virology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565, Japan

A deletion mutant of influenza virus haemagglutinin (HA; headless HA) lacking the globular region was expressed in CV-1 cells and detected with a monoclonal antibody, C179, which recognizes a conformational epitope in the middle of the stem region of HA and neutralizes all H1 and H2 subtypes. The cDNA coding for the headless HA was constructed from influenza virus A/Okuda/57 (H2N2), which was also used to select C179. The conformational epitope recognized by C179 was highly stable even after removal of the globular region. The survival rate of mice immunized with the headless HA and challenged with lethal influenza virus A/FM/1/47 (H1N1) was significantly higher than that of the control mice. The headless HA has the potential to induce cross-protection against influenza virus infection.

Received 3 October 1995; accepted 26 February 1996.

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