Construction of “Toxin Complex” in a Mutant Serotype C Strain of Clostridium botulinum Harboring a Defective Neurotoxin Gene

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• 作者：Tomonori Suzuki ; Thomas Nagano ; Koichi Niwa ; Masataka Uchino…
• 刊名：Current Microbiology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：74
• 期：1
• 页码：49-54
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Microbiology; Biotechnology;
• 出版者：Springer US
• ISSN：1432-0991
• 卷排序：74

文摘

A non-toxigenic mutant of the toxigenic serotype C Clostridium botulinum strain Stockholm (C-St), C-N71, does not produce the botulinum neurotoxin (BoNT). However, the original strain C-St produces botulinum toxin complex, in which BoNT is associated with non-toxic non-hemagglutinin (NTNHA) and three hemagglutinin proteins (HA-70, HA-33, and HA-17). Therefore, in this study, we aimed to elucidate the effects of bont gene knockout on the formation of the “toxin complex.” Nucleotide sequence analysis revealed that a premature stop codon was introduced in the bont gene, whereas other genes were not affected by this mutation. Moreover, we successfully purified the “toxin complex” produced by C-N71. The “toxin complex” was identified as a mixture of NTNHA/HA-70/HA-17/HA-33 complexes with intact NTNHA or C-terminally truncated NTNHA, without BoNT. These results indicated that knockout of the bont gene does not affect the formation of the “toxin complex.” Since the botulinum toxin complex has been shown to play an important role in oral toxin transport in the human and animal body, a non-neurotoxic “toxin complex” of C-N71 may be valuable for the development of an oral drug delivery system.