Journal of Veterinary Science

The Korean Society of Veterinary Science (대한수의학회)
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Deletion of the oligopeptide transporter Lmo2193 decreases the virulence of Listeria monocytogenes

  • Li, Honghuan (College of Animal Science and Technology, Shihezi University) ;
  • Qiao, Yanjie (College of Animal Science and Technology, Shihezi University) ;
  • Du, Dongdong (Analysis and Testing Center, Xinjiang Academy of Agricultural and Reclamation Science) ;
  • Wang, Jing (College of Animal Science and Technology, Shihezi University) ;
  • Ma, Xun (College of Animal Science and Technology, Shihezi University)
  • Received : 2020.05.13
  • Accepted : 2020.10.05
  • Published : 2020.11.30
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Abstract

Background: Listeria monocytogenes is a gram-positive bacterium that causes listeriosis mainly in immunocompromised hosts. It can also cause foodborne outbreaks and has the ability to adapt to various environments. Peptide uptake in gram-positive bacteria is enabled by oligopeptide permeases (Opp) in a process that depends on ATP hydrolysis by OppD and F. Previously a putative protein Lmo2193 was predicted to be OppD, but little is known about the role of OppD in major processes of L. monocytogenes, such as growth, virulence, and biofilm formation. Objectives: To determine whether the virulence traits of L. monocytogenes are related to OppD. Methods: In this study, Lmo2193 gene deletion and complementation strains of L. monocytogenes were generated and compared with a wild-type strain for the following: adhesiveness, invasion ability, intracellular survival, proliferation, 50% lethal dose (LD50) to mice, and the amount bacteria in the mouse liver, spleen, and brain. Results: The results showed that virulence of the deletion strain was 1.34 and 0.5 orders of magnitude higher than that of the wild-type and complementation strains, respectively. The function of Lmo2193 was predicted and verified as OppD from the ATPase superfamily. Deletion of lmo2193 affected the normal growth of L. monocytogenes, reduced its virulence in cells and mice, and affected its ability to form biofilms. Conclusions: Deletion of the oligopeptide transporter Lmo2193 decreases the virulence of L. monocytogenes. These effects may be related to OppD's function, which provides a new perspective on the regulation of oligopeptide transporters in L. monocytogenes.

Keywords

Acknowledgement

We would like to acknowledge the contribution of Mogo Edit for writing assistance.

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