Publication: Study on cytotoxicity and nucleotide sequences of enterotoxin FM of Bacillus cereus isolated from various food sources
Issued Date
2008-09-01
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ISSN
01252208
01252208
01252208
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2-s2.0-52949121754
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of the Medical Association of Thailand. Vol.91, No.9 (2008), 1425-1432
Suggested Citation
Nudjaree Boonchai, Shin Ishiro Asano, Hisanori Bando, Chanpen Wiwat Study on cytotoxicity and nucleotide sequences of enterotoxin FM of Bacillus cereus isolated from various food sources. Journal of the Medical Association of Thailand. Vol.91, No.9 (2008), 1425-1432. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/19546
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Title
Study on cytotoxicity and nucleotide sequences of enterotoxin FM of Bacillus cereus isolated from various food sources
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Abstract
Objective: To determine the cytotoxicity of the crude culture broth containing enterotoxins of B. cereus and investigate the nucleotide sequences of ent FM among various isolates B. cereus. Material and Method: The 1.2 kb fragment of ent FM of B. cereus was amplified, cloned, sequenced, and compared with published sequences. The biological activity of crude culture broth containing enterotoxins with and without monoclonal antibodies against HBL, NHE, and EntFM enterotoxins was tested using Vero cells assay. Results: A percentage homology of nucleotide sequences and deduced amino acid sequences among test isolates and published strains were 90-99% and 88-99%, respectively. An assays for cytotoxic activity revealed that seven and three of B. cereus isolates were positive for NHE enterotoxin and EntFM enterotoxin, respectively. In addition, the 4-repeating sequences "TCAAAC" of ent FM were found, which may or may not be probably correlated with cytotoxicity of B. cereus. Conclusion: The enterotoxin FM from B. cereus isolates is cytotoxic and the degree of cytotoxicity depends on the bacterial strain.