Characterization of Monoclonal Antibodies Generated against <i>Norwalk virus</i> Gll Capsid Protein Expressed in <i>Escherichia coli</i>

J-STAGE
  • Yoda Tomoko
    Division of Food Microbiology, Osaka Prefectural Institute of Public Health
  • Terano Yoshitake
    Department of Immunotechnology, Osaka City University, Medical School
  • Suzuki Yasuhiko
    Division of Pathology, Osaka Prefectural Institute of Public Health
  • Yamazaki Kenji
    Division of Virology, Osaka Prefectural Institute of Public Health
  • Oishi Isao
    Division of Pathology, Osaka Prefectural Institute of Public Health
  • Utagawa Etuko
    Department of Virology II, National Institute of Infectious Diseases
  • Shimada Akira
    Gifu Research Laboratory, Immunology Division, JBC Inc.
  • Matsuura Shiro
    Research and Development Division, Iatron Laboratories, Inc.
  • Nakajima Masaharu
    Gifu Research Laboratory, Immunology Division, JBC Inc.
  • Shibata Tadayoshi
    Division of Food Microbiology, Osaka Prefectural Institute of Public Health

抄録

The Norwalk virus (NV) causes outbreaks of acute non-bacterial gastroenteritis in humans. The virus capsid is composed of a single 60kDa protein. The capsid protein of NV36 (genogroup II, Mexico virus type) was expressed in an Escherichia coli system and ten monoclonal antibodies (MAbs) were generated against it. The reactivity of these MAbs was characterized using enzyme-linked immunosorbent assay (ELISA) and Western blot (WB) analysis towards 20 overlapping fragments of the NV36 capsid protein expressed in E. coli. All of the MAbs recognized sequential (continuous) epitopes on the three antigenic regions. Six of the 10 MAbs recognized fragment 2 (equivalent residues 31-70), three MAbs recognized fragment 13 (residues 361-403) and one MAb recognized fragment 7 (residues 181-220), suggesting that the N-terminal domain (residues 1-220) may contain more antigenic epitopes than the C-terminal domain (residues 210-548). Furthermore, two MAbs (1B4 and 1F6) reacted in WB with three purified NV strains (genogroup II) derived from patients' stool samples. It was also found that genogroup I recombinant NV96-908 (genogroup I, KY89 type) could be detected as sensitively as recombinant NV36 (genogroup II) by ELISA with a set of the MAbs produced here.

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