Abstract
The neurotoxin gene of non-proteolyticClostridium botulinum type B (strain Eklund 17B) was cloned as a series of overlapping polymerase chain reaction (PCR) fragments generated with primers designed to conserved regions of published botulinal toxin (BoNT) sequences. The 3′ end of the gene was obtained by using primers designed to the determined sequence of non-proteolytic BoNT/B and a published downstream region of BoNT/B gene from a proteolytic strain. Translation of the nucleotide sequence derived from cloned PCR fragments demonstrated the toxin gene encodes a protein of 1291 amino acid residues. Comparative alignment of the derived BoNT/B sequence with those of other published botulinal neurotoxins revealed highest sequence relatedness with BoNT/B of proteolyticC. botulinum. The sequence identity between non-proteolytic and proteolytic BoNT/B was 97.7% for the light chain (corresponding to 10 amino acid changes) and 90.2% for the heavy chain (corresponding to 81 amino acid changes), with most differences occurring at the C-terminal end. A genealogical tree constructed from all known botulinal neurotoxin sequences revealed marked topological differences with a phylogenetic tree ofC. botulinum types based upon small-subunit (16S) ribosomal RNA sequences.
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Hutson, R.A., Collins, M.D., East, A.K. et al. Nucleotide sequence of the gene coding for non-proteolyticClostridium botulinum type B neurotoxin: Comparison with other clostridial neurotoxins. Current Microbiology 28, 101–110 (1994). https://doi.org/10.1007/BF01569055
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DOI: https://doi.org/10.1007/BF01569055