title: Sequence of the gene coding for the neurotoxin of Clostridium botulinum type A associated with infant botulism: comparison with other clostridial neurotoxins.
abstract: The neurotoxin gene from a strain of Clostridium botulinum type A causing infant botulism was cloned as a series of overlapping polymerase chain reaction (PCR) fragments generated using primers designed to conserved regions of published botulinal toxin (BoNT) sequences. Translation of the nucleotide sequence derived from cloned PCR fragments demonstrated that the toxin gene encodes a protein of 1,296 amino acid residues. Comparative alignment of the derived infant BoNT/A sequence with those of other published neurotoxins revealed highest sequence relatedness with BoNT/A of classical food-borne botulism. The sequence identity between infant and classical BoNT/A was 94.9% for the light chain (corresponding to 23 amino acid changes) and 87.1% for the heavy chain (corresponding to 109 amino acid changes).
authors.affiliation: Department of Microbiology, AFRC Institute of Food Research, Reading, UK.
authors.forename: A
authors.initials: A
authors.lastname: Willems
authors.forename: A K
authors.initials: AK
authors.lastname: East
authors.forename: P A
authors.initials: PA
authors.lastname: Lawson
authors.forename: M D
authors.initials: MD
authors.lastname: Collins
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D001483:Base Sequence; D001905:Botulinum Toxins / Q000235:genetics*; D001906:Botulism / Q000382:microbiology*; D003014:Clostridium botulinum / Q000235:genetics*; D005827:Genetics, Microbial; D006801:Humans; D066298:In Vitro Techniques; D007223:Infant; D008969:Molecular Sequence Data; D009498:Neurotoxins / Q000235:genetics*; D016133:Polymerase Chain Reaction
chemical_list: D001426:Bacterial Proteins; D009498:Neurotoxins; D001905:Botulinum Toxins