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  • Title: Nucleotide sequence of the Shiga-like toxin genes of Escherichia coli.
    Author: Calderwood SB, Auclair F, Donohue-Rolfe A, Keusch GT, Mekalanos JJ.
    Journal: Proc Natl Acad Sci U S A; 1987 Jul; 84(13):4364-8. PubMed ID: 3299365.
    Abstract:
    We have determined the nucleotide sequence of the sltA and sltB genes that encode the Shiga-like toxin (SLT) produced by Escherichia coli phage H19B. The amino acid composition of the A and B subunits of SLT is very similar to that previously established for Shiga toxin from Shigella dysenteriae 1, and the deduced amino acid sequence of the B subunit of SLT is identical with that reported for the B subunit of Shiga toxin. The genes for the A and B subunits of SLT apparently constitute an operon, with only 12 nucleotides separating the coding regions. There is a 21-base-pair region of dyad symmetry overlapping the proposed promoter of the slt operon that may be involved in regulation of SLT production by iron. The peptide sequence of the A subunit of SLT is homologous to the A subunit of the plant toxin ricin, providing evidence for the hypothesis that certain prokaryotic toxins may be evolutionarily related to eukaryotic enzymes.
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