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Gou H, Liu Y, Shi W, Nan J, Wang C, Sun Y, Cao Q, Wei H, Song C, Tian C, Wei Y, Xue H. The Characteristics and Function of Internalin G in Listeria monocytogenes. Pol J Microbiol 2022; 71:63-71. [PMID: 35635167 PMCID: PMC9152910 DOI: 10.33073/pjm-2022-009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 02/10/2022] [Indexed: 11/05/2022] Open
Abstract
In order to clarified characteristics and function of internalin G (inlG) in Listeria monocytogenes ATCC®19111 (1/2a) (LM), the immune protection of the inlG was evaluated in mice, the homologous recombination was used to construct inlG deletion strains, and their biological characteristics were studied by the transcriptomics analysis. As a result, the immunization of mice with the purified protein achieved a protective effect against bacterial infection. The deletion strain LM-AinlG was successfully constructed with genetic stability. The mouse infection test showed that the virulence of LM was decreased after the deletion of the inlG gene. The deletion strain showed enhanced adhesion to and invasion of Caco-2 cells. Compared to the wild strain, 18 genes were up-regulated, and 24 genes were down-regulated in the LM-AinlG. This study has laid a foundation for further research on the function of inlG and the pathogenesis of LM. In this study, immunization of mice with the purified inlG protein achieved a protective effect against Listeria monocytogenes infection. The virulence of LM-ΔinlG was decreased by mouse infection. However, the adhesion and invasion ability to Caco-2 cell were enhanced. Compared to the wild strain, 18 genes were up-regulated, and 24 genes were down-regulated in the LM-ΔinlG. This study has laid a foundation for further study of the function of the inlG and the listeriosis.
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Affiliation(s)
- Huitian Gou
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Yuanyuan Liu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Wenjing Shi
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Jinyu Nan
- Jiuquan City Animal Control Disease Center, Jiuquan, China
| | - Chuan Wang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Yanan Sun
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Qihang Cao
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Huilin Wei
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Chen Song
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Changqing Tian
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Yanquan Wei
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
| | - Huiwen Xue
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, China
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Validation of Predicted Virulence Factors in Listeria monocytogenes Identified Using Comparative Genomics. Toxins (Basel) 2019; 11:toxins11090508. [PMID: 31480280 PMCID: PMC6783856 DOI: 10.3390/toxins11090508] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/14/2019] [Accepted: 08/24/2019] [Indexed: 12/19/2022] Open
Abstract
Listeria monocytogenes is an intracellular facultative pathogen that causes listeriosis, a foodborne zoonotic infection. There are differences in the pathogenic potential of L. monocytogenes subtypes and strains. Comparison of the genome sequences among L. monocytogenes pathogenic strains EGD-e and F2365 with nonpathogenic L. innocua CLIP1182 and L. monocytogenes strain HCC23 revealed a set of proteins that were present in pathogenic strains and had no orthologs among the nonpathogenic strains. Among the candidate virulence factors are five proteins: putrescine carbamoyltransferase; InlH/InlC2 family class 1 internalin; phosphotransferase system (PTS) fructose transporter subunit EIIC; putative transketolase; and transcription antiterminator BglG family. To determine if these proteins have a role in adherence and invasion of intestinal epithelial Caco-2 cells and/or contribute to virulence, five mutant strains were constructed. F2365ΔinlC2, F2365Δeiic, and F2365Δtkt exhibited a significant (p < 0.05) reduction in adhesion to Caco-2 cells compared to parent F2365 strain. The invasion of F2365ΔaguB, F2365ΔinlC2, and F2365ΔbglG decreased significantly (p < 0.05) compared with the parent strain. Bacterial loads in mouse liver and spleen infected by F2365 was significantly (p < 0.05) higher than it was for F2365ΔaguB, F2365ΔinlC2, F2365Δeiic, F2365Δtkt, and F2365ΔbglG strains. This study demonstrates that aguB, inlC2, eiic, tkt, and bglG play a role in L. monocytogenes pathogenicity.
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Chen J, Cheng C, Lv Y, Fang W. Genetic diversity of internalin genes in theascB-dapElocus amongListeria monocytogeneslineages III and IV strains. J Basic Microbiol 2012; 53:778-84. [DOI: 10.1002/jobm.201200137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 05/20/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Jianshun Chen
- Zhejiang Fisheries Technical Extension Center, and Zhejiang Aquatic Disease Prevention and Quarantine Center; Hangzhou Zhejiang, P.R. China
| | - Changyong Cheng
- Zhejiang University Institute of Preventive Veterinary Medicine, and Zhejiang Provincial Key Laboratory of Prevent Veterinary Medicine; Hangzhou Zhejiang, P.R. China
| | - Yonghui Lv
- National Fisheries Technical Extension Center; Beijing P.R. China
| | - Weihuan Fang
- Zhejiang University Institute of Preventive Veterinary Medicine, and Zhejiang Provincial Key Laboratory of Prevent Veterinary Medicine; Hangzhou Zhejiang, P.R. China
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Chen J, Cheng C, Xia Y, Zhao H, Fang C, Shan Y, Wu B, Fang W. Lmo0036, an ornithine and putrescine carbamoyltransferase in Listeria monocytogenes, participates in arginine deiminase and agmatine deiminase pathways and mediates acid tolerance. Microbiology (Reading) 2011; 157:3150-3161. [DOI: 10.1099/mic.0.049619-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Listeria monocytogenes is a foodborne pathogen causing listeriosis. Acid is one of the stresses that foodborne pathogens encounter most frequently. The ability to survive and proliferate in acidic environments is a prerequisite for infection. However, there is limited knowledge about the molecular basis of adaptation of L. monocytogenes to acid. Arginine deiminase (ADI) and agmatine deiminase (AgDI) systems are implicated in bacterial tolerance to acidic environments. Homologues of ADI and AgDI systems have been found in L. monocytogenes lineages I and II strains. Sequence analysis indicated that lmo0036 encodes a putative carbamoyltransferase containing conserved motifs and residues important for substrate binding. Lmo0036 acted as an ornithine carbamoyltransferase and putrescine carbamoyltransferase, representing the first example, to our knowledge, that catalyses reversible ornithine and putrescine carbamoyltransfer reactions. Catabolic ornithine and putrescine carbamoyltransfer reactions constitute the second step of ADI and AgDI pathways. However, the equilibrium of in vitro carbamoyltransfer reactions was overwhelmingly towards the anabolic direction, suggesting that catabolic carbamoyltransferase was probably the limiting step of the pathways. lmo0036 was induced at the transcriptional level when L. monocytogenes was subjected to low-pH stress. Its expression product in Escherichia coli exhibited higher catabolic carbamoyltransfer activities under acidic conditions. Consistently, absence of this enzyme impaired the growth of Listeria under mild acidic conditions (pH 4.8) and reduced its survival in synthetic human gastric fluid (pH 2.5), and corresponded to a loss in ammonia production, indicating that Lmo0036 was responsible for acid tolerance at both sublethal and lethal pH levels. Furthermore, Lmo0036 played a possible role in Listeria virulence.
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Affiliation(s)
- Jianshun Chen
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Changyong Cheng
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Ye Xia
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Hanxin Zhao
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Chun Fang
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Ying Shan
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
| | - Beibei Wu
- Zhejiang Provincial Center for Disease Control and Prevention, 630 Xincheng Road, Hangzhou, Zhejiang 310051, PR China
| | - Weihuan Fang
- Zhejiang University Institute of Preventive Veterinary Medicine and Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, 388 Yuhangtang Road, Hangzhou, Zhejiang 310058, PR China
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