Journal
MOLECULAR MICROBIOLOGY
Volume 83, Issue 4, Pages 669-681Publisher
WILEY
DOI: 10.1111/j.1365-2958.2012.07975.x
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Funding
- Yakult Bio-Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Grants-in-Aid for Scientific Research [23570211] Funding Source: KAKEN
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Enterohaemorrhagic Escherichia coli O157:H7 harbours a cryptic plasmid, pOSAK1, that carries only three ORFs: mobA (involved in plasmid mobilization), ORF1 and ORF2. Predicted proteins encoded by these two ORFs were found to share a weak homology with RnlA and RnlB, respectively, a toxinantitoxin system encoded on the E. coli K-12 chromosome. Here, we report that lsoA (ORF1) encodes a toxin and lsoB (ORF2) an antitoxin. In spite of the homologies, RnlB and LsoB functioned as antitoxins against only their cognate toxins and not interchangeably with each other. Interestingly, T4 phage Dmd suppressed the toxicities of both RnlA and LsoA by direct interaction, the first example of a phage with an antitoxin against multiple toxins.
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