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Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7
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Proteomic changes in EHEC O157:H7 under catechin intervention.

Zongjun Li1, Jiaqi Xie2, Xing Tian2

  • 1College of Food Science and Technology, Hunan Agriculture University, Changsha, 410128, China; Hunan Province Key Laboratory of Food Science and Biotechnology, Changsha, 410128, China.

Microbial Pathogenesis
|June 25, 2018
PubMed
Summary
This summary is machine-generated.

Catechin demonstrates significant antimicrobial effects against EHEC O157:H7, particularly in a simulated gastrointestinal environment. This natural compound disrupts bacterial cell structure and protein expression, leading to cell inhibition.

Keywords:
Bacterial proteomeBactericidal effectCatechinEHEC O157:H7Two-dimensional electrophoresis

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Area of Science:

  • Food Science
  • Microbiology
  • Biochemistry

Background:

  • Catechin is known for its antimicrobial properties.
  • Escherichia coli O157:H7 (EHEC O157:H7) is a significant foodborne pathogen.

Purpose of the Study:

  • To investigate the bactericidal effect of catechin on EHEC O157:H7 in a simulated human gastrointestinal environment.
  • To elucidate the underlying antibacterial mechanisms of catechin against EHEC O157:H7.

Main Methods:

  • Minimum bactericidal concentration (MBC) determination.
  • Bacteriostasis tests in simulated gastrointestinal juice.
  • Two-dimensional electrophoresis to analyze protein expression changes.

Main Results:

  • The MBC of catechin against EHEC O157:H7 was determined to be 5 µg/L.
  • Catechin's bactericidal effect increased with culture time and showed synergy with bile salt.
  • Significant alterations in EHEC O157:H7 protein expression were observed, including upregulation, downregulation, and disappearance of 20 proteins.

Conclusions:

  • Catechin exhibits potent bactericidal activity against EHEC O157:H7 in a simulated gastrointestinal environment.
  • The mechanism involves disruption of proteins related to cell structure and genetic processing, leading to cell death.
  • Catechin shows potential as a natural antimicrobial agent against EHEC O157:H7.