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We previously reported the nucleotide and deduced amino acid sequences of B. sphaericus 1593 and 2362 41.9kDa larvicldal toxin genes (1 4 2). Both these strains belonged to the same H-flagellar antigen group (H 5a, 5b) and possessed Identical.coding sequences in an open reading frame of 1110 nucleotides. Using restriction fragment probes derived from these sequences we have identified and cloned in pUC12 a 3.5kb Hindlll fragment from B. sphaericus 2297 which contains the entire toxin coding sequence. This strain belongs to a different antigenlc group (H 25) and showed 15 nucleotide changes and a 2 nucleotide insertion when compared with the corresponding sequences from strains 1593 and 2362. Three of these occur upstream of the ORF as does the 2 nucleotide insertion (CT) at position 159-160 (ACTQTTTAA). Within the coding region 12 nucleotide changes were found of which 5 resulted in amino acid changes; V-iF (99), A*S (104), H-<N <125), Y-tF (135), R-iK (267). The total length of the toxin coding sequence was unchanged (370 amino acids). The putative SD sequence is boxed and the nucleotide changes are underlined.

Bacillus sphaericusstrain 2297: nucleotide sequence of 41.9 kDa toxin gene