Volume 51, Issue 9 pp. 875-881
Article
Free Access

Proteomic Characterization of Enterohemorrhagic Escherichia coli O157:H7 in the Oxidation-Induced Viable but Non-Culturable State

Hiroshi Asakura

Corresponding Author

Hiroshi Asakura

Division of Biomedical Food Research, National Institute of Health Sciences, Setagaya-ku, Tokyo, 158-8501 Japan

Address correspondence to Dr. Hiroshi Asakura, Division of Biomedical Food Research, National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya-ku, Tokyo 158-8501, Japan. Fax: +81-3-3700-9246. E-mail: [email protected]Search for more papers by this author
Nantika Panutdaporn

Nantika Panutdaporn

Laboratory of Food Microbiology and Immunology, Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, 080-8555 Japan

Search for more papers by this author
Keiko Kawamoto

Keiko Kawamoto

Laboratory of Food Microbiology and Immunology, Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, 080-8555 Japan

Search for more papers by this author
Shizunobu Igimi

Shizunobu Igimi

Division of Biomedical Food Research, National Institute of Health Sciences, Setagaya-ku, Tokyo, 158-8501 Japan

Search for more papers by this author
Shigeki Yamamoto

Shigeki Yamamoto

Division of Biomedical Food Research, National Institute of Health Sciences, Setagaya-ku, Tokyo, 158-8501 Japan

Search for more papers by this author
Sou-ichi Makino

Sou-ichi Makino

Laboratory of Food Microbiology and Immunology, Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, 080-8555 Japan

Search for more papers by this author
First published: 14 November 2013
Citations: 41

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.

Abbreviations

  • AceF
  • dihydrolipoyllysine-residue acetyltransferase
  • Ahp
  • alkyl hydroperoxide reductase
  • Bcp
  • bacterioferritin comigratory protein
  • EHEC
  • enterohemorrhagic Escherichia coli
  • EF-TU
  • elongation factor
  • LpdA
  • lipoamide dehydrogenase
  • OmpW
  • outer membrane protein W
  • OxyR
  • oxidative stress regulator
  • PBS
  • phosphate buffered saline
  • RpoS
  • RNA polymerase sigma subunit
  • SurA
  • peptidyl-prolyl cis-transisomerase
  • TSA
  • tryptic soy agar
  • TSA-SP
  • TSA amended with 0.1% sodium pyruvate
  • 2-DE
  • two-dimensional gel electrophoresis
  • VBNC
  • viable but non-culturable.
    • The full text of this article hosted at iucr.org is unavailable due to technical difficulties.