effects of iron and temperature on shiga-like toxin i production by escherichia coli.iron is known to depress shiga toxin production by shigella dysenteriae 1, and temperature has been shown to regulate several genes required for shigella invasiveness. in this study, the influence of iron and temperature on regulation of a highly related toxin, shiga-like toxin i (slt-i) of enterohemorrhagic escherichia coli, was examined in strains lysogenic for the toxin-converting coliphage 933j and in strains carrying the cloned slt-i genes on a high-copy-number plasmid vector. for compariso ...19883121508
shiga-like toxin converting phage of enterohemorrhagic escherichia coli strain 933.production of shiga-like toxin (slt) by enterohemorrhagic escherichia coli (ehec) is controlled by phage conversion, and specific phages carry either the slt-i or slt-ii operon. ehec strain 933 produces both slt-i and slt-ii. previous studies demonstrated that the vast majority of phages recovered from strain 993 have hexagonal heads with short tails and encode slt-ii. however, conflicting results were obtained concerning the properties of slt-i converting phages from strain 933. the present stu ...19892671581
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