Proteomic characterization of enterohemorrhagic escherichia coli O157:H7 in the oxidation-induced viable but non-culturable state |
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Authors: | Asakura Hiroshi Panutdaporn Nantika Kawamoto Keiko Igimi Shizunobu Yamamoto Shigeki Makino Sou-Ichi |
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Affiliation: | Division of Biomedical Food Research, National Institute of Health Sciences, Tokyo, Japan. hasakura@nihs.go.jp |
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Abstract: | Enterohemorrhagic Escherichia coli (EHEC) O157 strain F2, a food isolate of an outbreak, is resistant to oxidative stress, but has increased stress-sensitivity after passage through mice. The stress-sensitive variant of F2 (designated MP37) has decreased culturability, but retains membrane integrity under stress conditions, indicating that the cells enter a viable but non-culturable (VBNC) state. Proteomic analyses revealed that MP37 in the VBNC state had decreased levels of some oxidation-responsive factors (AhpCF, AceF), but it markedly increased levels of outer membrane protein W (OmpW). Because F2 expressed higher levels of some ribosome-associated proteins (RaiA, S6, Bcp) than MP37, the effect of animal passage on the induction of the VBNC state in the EHEC O157 cells might be due to ribosomal activity. |
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Keywords: | EHEC O157 proteome VBNC |
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