Characterisation of monoclonal antibodies against haemagglutinin associated with Clostridium botulinum type C neurotoxin

Journal of Medical Microbiology
Nazira MahmutKeiji Oguma

Abstract

Of 11 monoclonal antibodies (MAbs) prepared against the non-toxic component of type C Clostridium botulinum 16S toxin to clarify the function of the non-toxic component, seven recognised HA1, three recognised HA3b and one recognised HA2. Results of epitope mapping indicated that three of the seven anti-HA1 MAbs recognised the region between amino acid residues 121 and 140 and four recognised the three-dimensional structure of HA1. Three anti-HA3b MAbs recognised different regions between (approximately) amino acids 405-430, 180-270 and 275-297. The ability of these MAbs to interfere with binding of 16S toxin or non-toxic component, HA1 or HA3b to erythrocytes and to intestine tissue sections of guinea-pig was observed. MAbs against HA3b and HA2 did not inhibit 16S toxin binding to either erythrocytes or epithelial cells, whereas some MAbs against HA1 did inhibit binding. The seven anti-HA1 MAbs can be classified into four groups based on their binding inhibition activities. The anti-HA1 MAbs that inhibited the binding of 16S toxin to the epithelial cells also neutralised or reduced the oral toxicity in mice, indicating that HA may play an important role in the absorption of the 16S toxin from the small intestine.

Citations

Jan 2, 2007·Biochimica Et Biophysica Acta·Toshio NakamuraAtsushi Nishikawa
Feb 1, 2005·European Journal of Pharmacology·Shinji YonedaHideaki Hara
Jan 18, 2006·Biochimica Et Biophysica Acta·Nobuo UotsuKeiji Oguma
Apr 23, 2013·Monoclonal Antibodies in Immunodiagnosis and Immunotherapy·Miles C ScotcherLarry Stanker
Nov 19, 2002·Journal of Medical Microbiology·Nazira MahmutKeiji Oguma
Sep 3, 2002·Clinical and Diagnostic Laboratory Immunology·G FigueroaM S Toledo
Jun 5, 2004·Biochemical and Biophysical Research Communications·Atsushi NishikawaKeiji Oguma

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