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Kent JE, Fujimoto LM, Shin K, Singh C, Yao Y, Park SH, Opella SJ, Plano GV, Marassi FM. Correlating the Structure and Activity of Y. pestis Ail in a Bacterial Cell Envelope. Biophys J 2020; 120:453-462. [PMID: 33359463 DOI: 10.1016/j.bpj.2020.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 12/08/2020] [Accepted: 12/16/2020] [Indexed: 11/16/2022] Open
Abstract
Understanding microbe-host interactions at the molecular level is a major goal of fundamental biology and therapeutic drug development. Structural biology strives to capture biomolecular structures in action, but the samples are often highly simplified versions of the complex native environment. Here, we present an Escherichia coli model system that allows us to probe the structure and function of Ail, the major surface protein of the deadly pathogen Yersinia pestis. We show that cell surface expression of Ail produces Y. pestis virulence phenotypes in E. coli, including resistance to human serum, cosedimentation of human vitronectin, and pellicle formation. Moreover, isolated bacterial cell envelopes, encompassing inner and outer membranes, yield high-resolution solid-state NMR spectra that reflect the structure of Ail and reveal Ail sites that are sensitive to the bacterial membrane environment and involved in the interactions with human serum components. The data capture the structure and function of Ail in a bacterial outer membrane and set the stage for probing its interactions with the complex milieu of immune response proteins present in human serum.
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Affiliation(s)
- James E Kent
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California
| | - Lynn M Fujimoto
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California
| | - Kyungsoo Shin
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California
| | - Chandan Singh
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California
| | - Yong Yao
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California
| | - Sang Ho Park
- Department Chemistry and Biochemistry, University of California, San Diego, La Jolla, California
| | - Stanley J Opella
- Department Chemistry and Biochemistry, University of California, San Diego, La Jolla, California
| | - Gregory V Plano
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, Florida
| | - Francesca M Marassi
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California.
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2
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Zhang F, Zhang F, Huang L, Zeng D, Cruz CV, Li Z, Zhou Y. Comparative proteomic analysis reveals novel insights into the interaction between rice and Xanthomonas oryzae pv. oryzae. BMC PLANT BIOLOGY 2020; 20:563. [PMID: 33317452 PMCID: PMC7734852 DOI: 10.1186/s12870-020-02769-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 12/02/2020] [Indexed: 05/21/2023]
Abstract
BACKGROUND Bacterial blight, which is caused by Xanthomonas oryzae pv. oryzae (Xoo), is a devastating rice disease worldwide. Rice introgression line H471, derived from the recurrent parent Huang-Hua-Zhan (HHZ) and the donor parent PSBRC28, exhibits broad-spectrum resistance to Xoo, including to the highly virulent Xoo strain PXO99A, whereas its parents are susceptible to PXO99A. To characterize the responses to Xoo, we compared the proteome profiles of the host and pathogen in the incompatible interaction (H471 inoculated with PXO99A) and the compatible interaction (HHZ inoculated with PXO99A). RESULTS In this study, a total of 374 rice differentially abundant proteins (DAPs) and 117 Xoo DAPs were detected in the comparison between H471 + PXO99A and HHZ + PXO99A. Most of the Xoo DAPs related to pathogen virulence, including the outer member proteins, type III secretion system proteins, TonB-dependent receptors, and transcription activator-like effectors, were less abundant in the incompatible interaction than in the compatible interaction. The rice DAPs were mainly involved in secondary metabolic processes, including phenylalanine metabolism and the biosynthesis of flavonoids and phenylpropanoids. Additionally, some DAPs involved in the phenolic phytoalexin and salicylic acid (SA) biosynthetic pathways accumulated much more in H471 than in HHZ after the inoculation with PXO99A, suggesting that phytoalexin and SA productions were induced faster in H471 than in HHZ. Further analyses revealed that the SA content increased much more rapidly in H471 than in HHZ after the inoculation, suggesting that the SA signaling pathway was activated faster in the incompatible interaction than in the compatible interaction. CONCLUSIONS Overall, our results indicate that during an incompatible interaction between H471 and PXO99A, rice plants prevent pathogen invasion and also initiate multi-component defense responses that inhibit disease development.
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Affiliation(s)
- Fan Zhang
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China
- Graduate School of Chinese Academy of Agricultural Sciences, 12 Zhong-Guan-Cun Street, Beijing, 100081, China
| | - Fan Zhang
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China
| | - Liyu Huang
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China
- School of Agriculture, Yunnan University, Kunming, 650091, China
| | - Dan Zeng
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China
| | - Casiana Vera Cruz
- International Rice Research Institute, DAPO Box 7777, Metro Manila, The Philippines
| | - Zhikang Li
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China
| | - Yongli Zhou
- Institute of Crop Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, 12 South Zhong-Guan-Cun Street, Beijing, 100081, China.
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Singh C, Lee H, Tian Y, Schesser Bartra S, Hower S, Fujimoto LM, Yao Y, Ivanov SA, Shaikhutdinova RZ, Anisimov AP, Plano GV, Im W, Marassi FM. Mutually constructive roles of Ail and LPS in Yersinia pestis serum survival. Mol Microbiol 2020; 114:510-520. [PMID: 32462782 DOI: 10.1111/mmi.14530] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/17/2020] [Accepted: 05/18/2020] [Indexed: 01/12/2023]
Abstract
The outer membrane is a key virulence determinant of gram-negative bacteria. In Yersinia pestis, the deadly agent that causes plague, the protein Ail and lipopolysaccharide (LPS)6 enhance lethality by promoting resistance to human innate immunity and antibiotics, enabling bacteria to proliferate in the human host. Their functions are highly coordinated. Here we describe how they cooperate to promote pathogenesis. Using a multidisciplinary approach, we identify mutually constructive interactions between Ail and LPS that produce an extended conformation of Ail at the membrane surface, cause thickening and rigidification of the LPS membrane, and collectively promote Y. pestis survival in human serum, antibiotic resistance, and cell envelope integrity. The results highlight the importance of the Ail-LPS assembly as an organized whole, rather than its individual components, and provide a handle for targeting Y. pestis pathogenesis.
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Affiliation(s)
- Chandan Singh
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Hwayoung Lee
- Department of Biological Sciences, Chemistry, and Bioengineering, Lehigh University, Bethlehem, PA, USA
| | - Ye Tian
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Sara Schesser Bartra
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Suzanne Hower
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Lynn M Fujimoto
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Yong Yao
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Sergey A Ivanov
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russian Federation
| | - Rima Z Shaikhutdinova
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russian Federation
| | - Andrey P Anisimov
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russian Federation
| | - Gregory V Plano
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Wonpil Im
- Department of Biological Sciences, Chemistry, and Bioengineering, Lehigh University, Bethlehem, PA, USA
| | - Francesca M Marassi
- Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
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He YX, Ye CL, Zhang P, Li Q, Park CG, Yang K, Jiang LY, Lv Y, Ying XL, Ding HH, Huang HP, Mambwe Tembo J, Li AY, Cheng B, Zhang SS, Zheng GX, Chen SY, Li W, Xia LX, Kan B, Wang X, Jing HQ, Yang RF, Peng H, Fu YX, Klena JD, Skurnik M, Chen T. Yersinia pseudotuberculosis Exploits CD209 Receptors for Promoting Host Dissemination and Infection. Infect Immun 2019; 87:e00654-18. [PMID: 30348825 PMCID: PMC6300620 DOI: 10.1128/iai.00654-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 10/09/2018] [Indexed: 12/20/2022] Open
Abstract
Yersinia pseudotuberculosis is a Gram-negative enteropathogen and causes gastrointestinal infections. It disseminates from gut to mesenteric lymph nodes (MLNs), spleen, and liver of infected humans and animals. Although the molecular mechanisms for dissemination and infection are unclear, many Gram-negative enteropathogens presumably invade the small intestine via Peyer's patches to initiate dissemination. In this study, we demonstrate that Y. pseudotuberculosis utilizes its lipopolysaccharide (LPS) core to interact with CD209 receptors, leading to invasion of human dendritic cells (DCs) and murine macrophages. These Y. pseudotuberculosis-CD209 interactions result in bacterial dissemination to MLNs, spleens, and livers of both wild-type and Peyer's patch-deficient mice. The blocking of the Y. pseudotuberculosis-CD209 interactions by expression of O-antigen and with oligosaccharides reduces infectivity. Based on the well-documented studies in which HIV-CD209 interaction leads to viral dissemination, we therefore propose an infection route for Y. pseudotuberculosis where this pathogen, after penetrating the intestinal mucosal membrane, hijacks the Y. pseudotuberculosis-CD209 interaction antigen-presenting cells to reach their target destinations, MLNs, spleens, and livers.
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Affiliation(s)
- Ying-Xia He
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Cheng-Lin Ye
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Pei Zhang
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Qiao Li
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Chae Gyu Park
- Laboratory of Immunology, Brain Korea 21 PLUS Project for Medical Science, Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Kun Yang
- Department of Pathogen Biology and Immunology, Shihezi University School of Medicine, Shihezi, Xinjiang, China
| | - Ling-Yu Jiang
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Yin Lv
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Xiao-Ling Ying
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Hong-Hui Ding
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Hong-Ping Huang
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - John Mambwe Tembo
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
- Department of Paediatrics & Child Health, The University of Zambia-University College London Medical School at Zambia, Lusaka, Zambia
| | - An-Yi Li
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Bing Cheng
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
| | - Shu-Sheng Zhang
- Department of Biomedical Science, College of Medicine-Rockford, University of Illinois at Chicago, Rockford, Illinois, USA
| | - Guo-Xing Zheng
- Department of Biomedical Science, College of Medicine-Rockford, University of Illinois at Chicago, Rockford, Illinois, USA
| | - Shi-Yun Chen
- Key Laboratory of Special Pathogens and Biosafety, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
| | - Wei Li
- Department of Diarrheal Diseases, National Institute for Communicable Diseases Control and Prevention, Beijing, China
| | - Lian-Xu Xia
- Department of Diarrheal Diseases, National Institute for Communicable Diseases Control and Prevention, Beijing, China
| | - Biao Kan
- Department of Diarrheal Diseases, National Institute for Communicable Diseases Control and Prevention, Beijing, China
| | - Xin Wang
- Department of Diarrheal Diseases, National Institute for Communicable Diseases Control and Prevention, Beijing, China
| | - Huai-Qi Jing
- Department of Diarrheal Diseases, National Institute for Communicable Diseases Control and Prevention, Beijing, China
| | - Rui-Fu Yang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
| | - Hua Peng
- Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Yang-Xin Fu
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - John D Klena
- Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Mikael Skurnik
- Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland
| | - Tie Chen
- Department of Clinical Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Sciences and Technology, Wuhan, Hubei, China
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Zhang J, Hu J, Shen H, Zhang Y, Sun D, Pu X, Yang Q, Fan Q, Lin B. Genomic analysis of the Phalaenopsis pathogen Dickeya sp. PA1, representing the emerging species Dickeya fangzhongdai. BMC Genomics 2018; 19:782. [PMID: 30373513 PMCID: PMC6206727 DOI: 10.1186/s12864-018-5154-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 10/09/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Dickeya sp. strain PA1 is the causal agent of bacterial soft rot in Phalaenopsis, an important indoor orchid in China. PA1 and a few other strains were grouped into a novel species, Dickeya fangzhongdai, and only the orchid-associated strains have been shown to cause soft rot symptoms. METHODS We constructed the complete PA1 genome sequence and used comparative genomics to explore the differences in genomic features between D. fangzhongdai and other Dickeya species. RESULTS PA1 has a 4,979,223-bp circular genome with 4269 predicted protein-coding genes. D. fangzhongdai was phylogenetically similar to Dickeya solani and Dickeya dadantii. The type I to type VI secretion systems (T1SS-T6SS), except for the stt-type T2SS, were identified in D. fangzhongdai. The three phylogenetically similar species varied significantly in terms of their T5SSs and T6SSs, as did the different D. fangzhongdai strains. Genomic island (GI) prediction and synteny analysis (compared to D. fangzhongdai strains) of PA1 also indicated the presence of T5SSs and T6SSs in strain-specific regions. Two typical CRISPR arrays were identified in D. fangzhongdai and in most other Dickeya species, except for D. solani. CRISPR-1 was present in all of these Dickeya species, while the presence of CRISPR-2 varied due to species differentiation. A large polyketide/nonribosomal peptide (PK/NRP) cluster, similar to the zeamine biosynthetic gene cluster in Dickeya zeae rice strains, was discovered in D. fangzhongdai and D. solani. The D. fangzhongdai and D. solani strains might recently have acquired this gene cluster by horizontal gene transfer (HGT). CONCLUSIONS Orchid-associated strains are the typical members of D. fangzhongdai. Genomic analysis of PA1 suggested that this strain presents the genomic characteristics of this novel species. Considering the absence of the stt-type T2SS, the presence of CRISPR loci and the zeamine biosynthetic gene cluster, D. fangzhongdai is likely a transitional form between D. dadantii and D. solani. This is supported by the later acquisition of the zeamine cluster and the loss of CRISPR arrays by D. solani. Comparisons of phylogenetic positions and virulence determinants could be helpful for the effective quarantine and control of this emerging species.
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Affiliation(s)
- Jingxin Zhang
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
| | - John Hu
- Department of Plant and Environmental Protection Sciences, College of Tropical Agriculture and Human Resources, University of Hawaii, Honolulu, HI 96822 USA
| | - Huifang Shen
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
| | - Yucheng Zhang
- Department of Plant Pathology, University of Florida, Gainesville, FL 32611 USA
| | - Dayuan Sun
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
| | - Xiaoming Pu
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
| | - Qiyun Yang
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
| | - Qiurong Fan
- Department of Plant Pathology, University of Florida, Gainesville, FL 32611 USA
| | - Birun Lin
- Key Laboratory of New Techniques for Plant Protection in Guangdong, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640 China
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Han D, Hung YC, Bratcher CL, Monu EA, Wang Y, Wang L. Formation of Sublethally Injured Yersinia enterocolitica, Escherichia coli O157:H7, and Salmonella enterica Serovar Enteritidis Cells after Neutral Electrolyzed Oxidizing Water Treatments. Appl Environ Microbiol 2018; 84:e01066-18. [PMID: 29959249 PMCID: PMC6102996 DOI: 10.1128/aem.01066-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 06/25/2018] [Indexed: 01/29/2023] Open
Abstract
The impact of neutral electrolyzed oxidizing (NEO) water treatments on the formation of sublethally injured Yersinia enterocolitica, Escherichia coli O157:H7, and Salmonella enterica serovar Enteritidis cells was evaluated. When pathogens were treated with 6% NEO water, approximately 38% of the treated Yersinia population and 25% of the treated Salmonella population became sublethally injured. The highest sublethally injured population was found when Salmonella cultures were treated with 3% NEO water. Regardless of the NEO water concentration used, no sublethally injured E. coli O157:H7 cells were found. To evaluate the sensitivity of NEO water-treated cells, four additional stresses (heat treatment, pH, NaCl, and bile salt) were tested. NEO water treatments did not generate any cross protection of treated cells against the other stresses. The diluted NEO water treatments in combination with heat treatment at 51°C for 10 min led to the best synergistic antimicrobial effects with a combined reduction of 7 logs. The gene expression results showed that NEO water treatments led to the upregulation of ompR, ail, and ycfR These genes are known for their involvement in cells' environmental stress responses. In summary, this study investigated the sublethal injury in pathogenic cells caused by NEO water treatments. Although sublethal injury was discovered, when combined with other mild stresses, the synergistic antimicrobial effects were able to further reduce the numbers of viable pathogenic cells. These results demonstrate the great application potential of NEO water as a nonthermal and less corrosive antimicrobial treatment.IMPORTANCE Neutral electrolyzed oxidizing (NEO) water is a nonthermal and less corrosive antimicrobial treatment that has been demonstrated to have efficacy in reducing microbial contamination in food, including meat, fresh fruit, and vegetables. However, NEO water treatments can cause sublethal injury to pathogenic cells, resulting in cells that retain their viability. Consequently, these sublethally injured pathogenic cells become a serious food safety concern. This study evaluated the formation of sublethally injured Yersinia enterocolitica, Escherichia coli O157:H7, and Salmonella enterica serovar Enteritidis cells by NEO water treatments and the potential cross protection against heat, pH, NaCl, or bile salt stresses that it may generate. No cross protection was observed. By combining NEO water treatments with sublethal levels of additional stresses, significant synergistic antimicrobial outcomes were achieved. These results indicate that mild processing treatments, when combined, can effectively reduce pathogen populations while minimizing the negative impacts on food quality.
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Affiliation(s)
- Dong Han
- Department of Animal Sciences, Auburn University, Auburn, Alabama, USA
| | - Yen-Con Hung
- Department of Food Science and Technology, University of Georgia, Griffin, Georgia, USA
| | | | - Emefa A Monu
- Department of Poultry Science, Auburn University, Auburn, Alabama, USA
| | - Yifen Wang
- Biosystem Engineering Department, Auburn University, Auburn, Alabama, USA
| | - Luxin Wang
- Department of Animal Sciences, Auburn University, Auburn, Alabama, USA
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Dutta SK, Yao Y, Marassi FM. Structural Insights into the Yersinia pestis Outer Membrane Protein Ail in Lipid Bilayers. J Phys Chem B 2017; 121:7561-7570. [PMID: 28726410 DOI: 10.1021/acs.jpcb.7b03941] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Yersinia pestis the causative agent of plague, is highly pathogenic and poses very high risk to public health. The outer membrane protein Ail (Adhesion invasion locus) is one of the most highly expressed proteins on the cell surface of Y. pestis, and a major target for the development of medical countermeasures. Ail is essential for microbial virulence and is critical for promoting the survival of Y. pestis in serum. Structures of Ail have been determined by X-ray diffraction and solution NMR spectroscopy, but the protein's activity is influenced by the detergents in these samples, underscoring the importance of the surrounding environment for structure-activity studies. Here we describe the backbone structure of Ail, determined in lipid bilayer nanodiscs, using solution NMR spectroscopy. We also present solid-state NMR data obtained for Ail in membranes containing lipopolysaccharide (LPS), a major component of the bacterial outer membranes. The protein in lipid bilayers, adopts the same eight-stranded β-barrel fold observed in the crystalline and micellar states. The membrane composition, however, appears to have a marked effect on protein dynamics, with LPS enhancing conformational order and slowing down the 15N transverse relaxation rate. The results provide information about the way in which an outer membrane protein inserts and functions in the bacterial membrane.
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Affiliation(s)
- Samit Kumar Dutta
- Sanford Burnham Prebys Medical Discovery Institute , 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Yong Yao
- Sanford Burnham Prebys Medical Discovery Institute , 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Francesca M Marassi
- Sanford Burnham Prebys Medical Discovery Institute , 10901 North Torrey Pines Road, La Jolla, California 92037, United States
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Abstract
The human pathogens
Yersinia pseudotuberculosis and
Yersinia enterocolitica cause enterocolitis, while
Yersinia pestis is responsible for pneumonic, bubonic, and septicaemic plague. All three share an infection strategy that relies on a virulence factor arsenal to enable them to enter, adhere to, and colonise the host while evading host defences to avoid untimely clearance. Their arsenal includes a number of adhesins that allow the invading pathogens to establish a foothold in the host and to adhere to specific tissues later during infection. When the host innate immune system has been activated, all three pathogens produce a structure analogous to a hypodermic needle. In conjunction with the translocon, which forms a pore in the host membrane, the channel that is formed enables the transfer of six ‘effector’ proteins into the host cell cytoplasm. These proteins mimic host cell proteins but are more efficient than their native counterparts at modifying the host cell cytoskeleton, triggering the host cell suicide response. Such a sophisticated arsenal ensures that yersiniae maintain the upper hand despite the best efforts of the host to counteract the infecting pathogen.
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Affiliation(s)
- Steve Atkinson
- Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Paul Williams
- Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, UK
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9
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Zeitouni NE, Dersch P, Naim HY, von Köckritz-Blickwede M. Hypoxia Decreases Invasin-Mediated Yersinia enterocolitica Internalization into Caco-2 Cells. PLoS One 2016; 11:e0146103. [PMID: 26731748 PMCID: PMC4701670 DOI: 10.1371/journal.pone.0146103] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 12/14/2015] [Indexed: 12/20/2022] Open
Abstract
Yersinia enterocolitica is a major cause of human yersiniosis, with enterocolitis being a typical manifestation. These bacteria can cross the intestinal mucosa, and invade eukaryotic cells by binding to host β1 integrins, a process mediated by the bacterial effector protein invasin. This study examines the role of hypoxia on the internalization of Y. enterocolitica into intestinal epithelial cells, since the gastrointestinal tract has been shown to be physiologically deficient in oxygen levels (hypoxic), especially in cases of infection and inflammation. We show that hypoxic pre-incubation of Caco-2 cells resulted in significantly decreased bacterial internalization compared to cells grown under normoxia. This phenotype was absent after functionally blocking host β1 integrins as well as upon infection with an invasin-deficient Y. enterocolitica strain. Furthermore, downstream phosphorylation of the focal adhesion kinase was also reduced under hypoxia after infection. In good correlation to these data, cells grown under hypoxia showed decreased protein levels of β1 integrins at the apical cell surface whereas the total protein level of the hypoxia inducible factor (HIF-1) alpha was elevated. Furthermore, treatment of cells with the HIF-1 α stabilizer dimethyloxalylglycine (DMOG) also reduced invasion and decreased β1 integrin protein levels compared to control cells, indicating a potential role for HIF-1α in this process. These results suggest that hypoxia decreases invasin-integrin-mediated internalization of Y. enterocolitica into intestinal epithelial cells by reducing cell surface localization of host β1 integrins.
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Affiliation(s)
- Nathalie E. Zeitouni
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Petra Dersch
- Helmholtz Center for Infection Research, Braunschweig, Germany
| | - Hassan Y. Naim
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Maren von Köckritz-Blickwede
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
- Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Hannover, Germany
- * E-mail:
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Bartra SS, Ding Y, Miya Fujimoto L, Ring JG, Jain V, Ram S, Marassi FM, Plano GV. Yersinia pestis uses the Ail outer membrane protein to recruit vitronectin. MICROBIOLOGY (READING, ENGLAND) 2015; 161:2174-2183. [PMID: 26377177 PMCID: PMC4806588 DOI: 10.1099/mic.0.000179] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 08/24/2015] [Accepted: 09/11/2015] [Indexed: 12/20/2022]
Abstract
Yersinia pestis, the agent of plague, requires the Ail (attachment invasion locus) outer membrane protein to survive in the blood and tissues of its mammalian hosts. Ail is important for both attachment to host cells and for resistance to complement-dependent bacteriolysis. Previous studies have shown that Ail interacts with components of the extracellular matrix, including fibronectin, laminin and heparan sulfate proteoglycans, and with the complement inhibitor C4b-binding protein. Here, we demonstrate that Ail-expressing Y. pestis strains bind vitronectin - a host protein with functions in cell attachment, fibrinolysis and inhibition of the complement system. The Ail-dependent recruitment of vitronectin resulted in efficient cleavage of vitronectin by the outer membrane Pla (plasminogen activator protease). Escherichia coli DH5α expressing Y. pestis Ail bound vitronectin, but not heat-treated vitronectin. The ability of Ail to directly bind vitronectin was demonstrated by ELISA using purified refolded Ail in nanodiscs.
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Affiliation(s)
- Sara Schesser Bartra
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33101, USA
| | - Yi Ding
- Sanford-Burnham Medical Research Institute, La Jolla, CA 92037, USA
| | - L. Miya Fujimoto
- Sanford-Burnham Medical Research Institute, La Jolla, CA 92037, USA
| | - Joshua G. Ring
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33101, USA
| | - Vishal Jain
- Division of Infectious Diseases and Immunology, University of Massachusetts Medical Center, Worcester, MA 01605, USA
| | - Sanjay Ram
- Division of Infectious Diseases and Immunology, University of Massachusetts Medical Center, Worcester, MA 01605, USA
| | | | - Gregory V. Plano
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33101, USA
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11
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Marassi FM, Ding Y, Schwieters CD, Tian Y, Yao Y. Backbone structure of Yersinia pestis Ail determined in micelles by NMR-restrained simulated annealing with implicit membrane solvation. JOURNAL OF BIOMOLECULAR NMR 2015; 63:59-65. [PMID: 26143069 PMCID: PMC4577439 DOI: 10.1007/s10858-015-9963-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 06/30/2015] [Indexed: 06/04/2023]
Abstract
The outer membrane protein Ail (attachment invasion locus) is a virulence factor of Yersinia pestis that mediates cell invasion, cell attachment and complement resistance. Here we describe its three-dimensional backbone structure determined in decyl-phosphocholine (DePC) micelles by NMR spectroscopy. The NMR structure was calculated using the membrane function of the implicit solvation potential, eefxPot, which we have developed to facilitate NMR structure calculations in a physically realistic environment. We show that the eefxPot force field guides the protein towards its native fold. The resulting structures provide information about the membrane-embedded global position of Ail, and have higher accuracy, higher precision and improved conformational properties, compared to the structures calculated with the standard repulsive potential.
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Affiliation(s)
- Francesca M Marassi
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA.
| | - Yi Ding
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Charles D Schwieters
- Division of Computational Bioscience, Center for Information Technology, National Institutes of Health, Building 12A, Bethesda, MD, 20892-5624, USA
| | - Ye Tian
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Yong Yao
- Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
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12
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Özdemir F, Arslan S. Genotypic and phenotypic virulence characteristics and antimicrobial resistance ofYersiniaspp. isolated from meat and milk products. J Food Sci 2015; 80:M1306-13. [DOI: 10.1111/1750-3841.12911] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 04/20/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Fatma Özdemir
- Abant Izzet Baysal Univ, Faculty of Arts and Sciences; Dept. of Biology; 14280 Gölköy/Bolu Turkey
| | - Seza Arslan
- Abant Izzet Baysal Univ, Faculty of Arts and Sciences; Dept. of Biology; 14280 Gölköy/Bolu Turkey
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13
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Jamali H, Paydar M, Radmehr B, Ismail S. Prevalence, characterization, and antimicrobial resistance of Yersinia species and Yersinia enterocolitica isolated from raw milk in farm bulk tanks. J Dairy Sci 2015; 98:798-803. [DOI: 10.3168/jds.2014-8853] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 10/29/2014] [Indexed: 11/19/2022]
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14
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Leskinen K, Varjosalo M, Skurnik M. Absence of YbeY RNase compromises the growth and enhances the virulence plasmid gene expression of Yersinia enterocolitica O:3. Microbiology (Reading) 2015; 161:285-299. [DOI: 10.1099/mic.0.083097-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Katarzyna Leskinen
- Haartman Institute, Department of Bacteriology and Immunology, Research Programs Unit, Immunobiology, University of Helsinki, Finland
| | - Markku Varjosalo
- Biocentrum Helsinki, Finland: Finnish Institute of Molecular Medicine, Finland
- Institute of Biotechnology, University of Helsinki, Finland
| | - Mikael Skurnik
- Helsinki University Central Hospital Laboratory Diagnostics, Helsinki, Finland
- Haartman Institute, Department of Bacteriology and Immunology, Research Programs Unit, Immunobiology, University of Helsinki, Finland
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15
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Minnick MF, Anderson BE, Lima A, Battisti JM, Lawyer PG, Birtles RJ. Oroya fever and verruga peruana: bartonelloses unique to South America. PLoS Negl Trop Dis 2014; 8:e2919. [PMID: 25032975 PMCID: PMC4102455 DOI: 10.1371/journal.pntd.0002919] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Bartonella bacilliformis is the bacterial agent of Carrión's disease and is presumed to be transmitted between humans by phlebotomine sand flies. Carrión's disease is endemic to high-altitude valleys of the South American Andes, and the first reported outbreak (1871) resulted in over 4,000 casualties. Since then, numerous outbreaks have been documented in endemic regions, and over the last two decades, outbreaks have occurred at atypical elevations, strongly suggesting that the area of endemicity is expanding. Approximately 1.7 million South Americans are estimated to be at risk in an area covering roughly 145,000 km2 of Ecuador, Colombia, and Peru. Although disease manifestations vary, two disparate syndromes can occur independently or sequentially. The first, Oroya fever, occurs approximately 60 days following the bite of an infected sand fly, in which infection of nearly all erythrocytes results in an acute hemolytic anemia with attendant symptoms of fever, jaundice, and myalgia. This phase of Carrión's disease often includes secondary infections and is fatal in up to 88% of patients without antimicrobial intervention. The second syndrome, referred to as verruga peruana, describes the endothelial cell-derived, blood-filled tumors that develop on the surface of the skin. Verrugae are rarely fatal, but can bleed and scar the patient. Moreover, these persistently infected humans provide a reservoir for infecting sand flies and thus maintaining B. bacilliformis in nature. Here, we discuss the current state of knowledge regarding this life-threatening, neglected bacterial pathogen and review its host-cell parasitism, molecular pathogenesis, phylogeny, sand fly vectors, diagnostics, and prospects for control.
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Affiliation(s)
- Michael F. Minnick
- Division of Biological Sciences, University of Montana, Missoula, Montana, United States of America
| | - Burt E. Anderson
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - Amorce Lima
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, Florida, United States of America
| | - James M. Battisti
- Division of Biological Sciences, University of Montana, Missoula, Montana, United States of America
| | - Phillip G. Lawyer
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Richard J. Birtles
- School of Environment and Life Sciences, University of Salford, Salford, United Kingdom
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16
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Tsang TM, Wiese JS, Felek S, Kronshage M, Krukonis ES. Ail proteins of Yersinia pestis and Y. pseudotuberculosis have different cell binding and invasion activities. PLoS One 2013; 8:e83621. [PMID: 24386237 PMCID: PMC3873954 DOI: 10.1371/journal.pone.0083621] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Accepted: 11/14/2013] [Indexed: 11/18/2022] Open
Abstract
The Yersinia pestis adhesin Ail mediates host cell binding and facilitates delivery of cytotoxic Yop proteins. Ail from Y. pestis and Y. pseudotuberculosis is identical except for one or two amino acids at positions 43 and 126 depending on the Y. pseudotuberculosis strain. Ail from Y. pseudotuberculosis strain YPIII has been reported to lack host cell binding ability, thus we sought to determine which amino acid difference(s) are responsible for the difference in cell adhesion. Y. pseudotuberculosis YPIII Ail expressed in Escherichia coli bound host cells, albeit at ~50% the capacity of Y. pestis Ail. Y. pestis Ail single mutants, Ail-E43D and Ail-F126V, both have decreased adhesion and invasion in E. coli when compared to wild-type Y. pestis Ail. Y. pseudotuberculosis YPIII Ail also had decreased binding to the Ail substrate fibronectin, relative to Y. pestis Ail in E. coli. When expressed in Y. pestis, there was a 30-50% decrease in adhesion and invasion depending on the substitution. Ail-mediated Yop delivery by both Y. pestis Ail and Y. pseudotuberculosis Ail were similar when expressed in Y. pestis, with only Ail-F126V giving a statistically significant reduction in Yop delivery of 25%. In contrast to results in E. coli and Y. pestis, expression of Ail in Y. pseudotuberculosis led to no measurable adhesion or invasion, suggesting the longer LPS of Y. pseudotuberculosis interferes with Ail cell-binding activity. Thus, host context affects the binding activities of Ail and both Y. pestis and Y. pseudotuberculosis Ail can mediate cell binding, cell invasion and facilitate Yop delivery.
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Affiliation(s)
- Tiffany M. Tsang
- Department of Microbiology and Immunology, University of Michigan School of Medicine Ann Arbor, Michigan, United States of America
| | - Jeffrey S. Wiese
- Department of Biomedical and Diagnostic Sciences, University of Detroit Mercy School of Dentistry, Detroit, Michigan, United States of America
| | - Suleyman Felek
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - Malte Kronshage
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - Eric S. Krukonis
- Department of Microbiology and Immunology, University of Michigan School of Medicine Ann Arbor, Michigan, United States of America
- Department of Biomedical and Diagnostic Sciences, University of Detroit Mercy School of Dentistry, Detroit, Michigan, United States of America
- * E-mail:
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17
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Ke Y, Chen Z, Yang R. Yersinia pestis: mechanisms of entry into and resistance to the host cell. Front Cell Infect Microbiol 2013; 3:106. [PMID: 24400226 PMCID: PMC3871965 DOI: 10.3389/fcimb.2013.00106] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 12/10/2013] [Indexed: 12/28/2022] Open
Abstract
During infection, Yersinia, a facultative intracellular bacterial species, exhibits the ability to first invade host cells and then counteract phagocytosis by the host cells. During these two distinct stages, invasion or antiphagocytic factors assist bacteria in manipulating host cells to accomplish each of these functions; however, the mechanism through which Yersinia regulates these functions during each step remains unclear. Here, we discuss those factors that seem to function reversely and give some hypothesis about how bacteria switch between the two distinct status.
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Affiliation(s)
- Yuehua Ke
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China ; Laboratory of Analytical Microbiology, State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences Beijing, China
| | - Zeliang Chen
- Institute of Disease Control and Prevention, Academy of Military Medical Sciences Beijing, China
| | - Ruifu Yang
- Laboratory of Analytical Microbiology, State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences Beijing, China
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18
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Identification of secreted bacterial proteins by noncanonical amino acid tagging. Proc Natl Acad Sci U S A 2013; 111:433-8. [PMID: 24347637 DOI: 10.1073/pnas.1301740111] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Pathogenic microbes have evolved complex secretion systems to deliver virulence factors into host cells. Identification of these factors is critical for understanding the infection process. We report a powerful and versatile approach to the selective labeling and identification of secreted pathogen proteins. Selective labeling of microbial proteins is accomplished via translational incorporation of azidonorleucine (Anl), a methionine surrogate that requires a mutant form of the methionyl-tRNA synthetase for activation. Secreted pathogen proteins containing Anl can be tagged by azide-alkyne cycloaddition and enriched by affinity purification. Application of the method to analysis of the type III secretion system of the human pathogen Yersinia enterocolitica enabled efficient identification of secreted proteins, identification of distinct secretion profiles for intracellular and extracellular bacteria, and determination of the order of substrate injection into host cells. This approach should be widely useful for the identification of virulence factors in microbial pathogens and the development of potential new targets for antimicrobial therapy.
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19
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Skorek K, Raczkowska A, Dudek B, Miętka K, Guz-Regner K, Pawlak A, Klausa E, Bugla-Płoskońska G, Brzostek K. Regulatory protein OmpR influences the serum resistance of Yersinia enterocolitica O:9 by modifying the structure of the outer membrane. PLoS One 2013; 8:e79525. [PMID: 24260242 PMCID: PMC3834241 DOI: 10.1371/journal.pone.0079525] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Accepted: 10/01/2013] [Indexed: 11/29/2022] Open
Abstract
The EnvZ/OmpR two-component system constitutes a regulatory pathway involved in bacterial adaptive responses to environmental cues. Our previous findings indicated that the OmpR regulator in Yersinia enterocolitica O:9 positively regulates the expression of FlhDC, the master flagellar activator, which influences adhesion/invasion properties and biofilm formation. Here we show that a strain lacking OmpR grown at 37°C exhibits extremely high resistance to the bactericidal activity of normal human serum (NHS) compared with the wild-type strain. Analysis of OMP expression in the ompR mutant revealed that OmpR reciprocally regulates Ail and OmpX, two homologous OMPs of Y. enterocolitica, without causing significant changes in the level of YadA, the major serum resistance factor. Analysis of mutants in individual genes belonging to the OmpR regulon (ail, ompX, ompC and flhDC) and strains lacking plasmid pYV, expressing YadA, demonstrated the contribution of the respective proteins to serum resistance. We show that Ail and OmpC act in an opposite way to the OmpX protein to confer serum resistance to the wild-type strain, but are not responsible for the high resistance of the ompR mutant. The serum resistance phenotype of ompR seems to be multifactorial and mainly attributable to alterations that potentiate the function of YadA. Our results indicate that a decreased level of FlhDC in the ompR mutant cells is partly responsible for the serum resistance and this effect can be suppressed by overexpression of flhDC in trans. The observation that the loss of FlhDC enhances the survival of wild-type cells in NHS supports the involvement of FlhDC regulator in this phenotype. In addition, the ompR mutant exhibited a lower level of LPS, but this was not correlated with changes in the level of FlhDC. We propose that OmpR might alter the susceptibility of Y. enterocolitica O:9 to complement-mediated killing through remodeling of the outer membrane.
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Affiliation(s)
- Karolina Skorek
- Department of Applied Microbiology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Adrianna Raczkowska
- Department of Applied Microbiology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Bartłomiej Dudek
- Department of Microbiology, Faculty of Biological Sciences, University of Wroclaw, Wroclaw, Poland
| | - Katarzyna Miętka
- Department of Microbiology, Faculty of Biological Sciences, University of Wroclaw, Wroclaw, Poland
| | - Katarzyna Guz-Regner
- Department of Microbiology, Faculty of Biological Sciences, University of Wroclaw, Wroclaw, Poland
| | - Aleksandra Pawlak
- Department of Microbiology, Faculty of Biological Sciences, University of Wroclaw, Wroclaw, Poland
| | - Elżbieta Klausa
- Regional Centre of Transfusion Medicine and Blood Bank, Wroclaw, Poland
| | | | - Katarzyna Brzostek
- Department of Applied Microbiology, Faculty of Biology, University of Warsaw, Warsaw, Poland
- * E-mail:
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20
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Mikula KM, Kolodziejczyk R, Goldman A. Yersinia infection tools-characterization of structure and function of adhesins. Front Cell Infect Microbiol 2013; 2:169. [PMID: 23316485 PMCID: PMC3539135 DOI: 10.3389/fcimb.2012.00169] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 12/13/2012] [Indexed: 12/16/2022] Open
Abstract
Among the seventeen species of the Gram-negative genus Yersinia, three have been shown to be virulent and pathogenic to humans and animals-Y. enterocolitica, Y. pseudotuberculosis, and Y. pestis. In order to be so, they are armoured with various factors that help them adhere to tissues and organelles, cross the cellular barrier and escape the immune system during host invasion. The group of proteins that mediate pathogen-host interactions constitute adhesins. Invasin, Ail, YadA, YadB, YadC, Pla, and pH 6 antigen belong to the most prominent and best-known Yersinia adhesins. They act at different times and stages of infection complementing each other by their ability to bind a variety of host molecules such as collagen, fibronectin, laminin, β1 integrins, and complement regulators. All the proteins are anchored in the bacterial outer membrane (OM), often forming rod-like or fimbrial-like structures that protrude to the extracellular milieu. Structural studies have shown that the anchor region forms a β-barrel composed of 8, 10, or 12 antiparallel β-strands. Depending on the protein, the extracellular part can be composed of several domains belonging to the immunoglobulin fold superfamily, or form a coiled-coil structure with globular head domain at the end, or just constitute several loops connecting individual β-strands in the β-barrel. Those extracellular regions define the activity of each adhesin. This review focuses on the structure and function of these important molecules, and their role in pathogenesis.
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Affiliation(s)
- Kornelia M Mikula
- Macromolecular X-Ray Crystallography Group, Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki Helsinki, Finland ; The National Doctoral Program in Informational and Structural Biology, Åbo Academy Turku, Finland
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21
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Abdela W, Graham M, Tsegaye H, Temesgen S, Yehualaeshet T. Effects of orange juice pH on survival, urease activity and DNA profiles of Yersinia enterocolitica and Yersinia pseudotuberculosis stored at 4 degree C. J Food Saf 2011; 31:487-496. [PMID: 22081735 PMCID: PMC3212038 DOI: 10.1111/j.1745-4565.2011.00325.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The objective of this study was to determine the survival, growth rate and possible cellular adaptation mechanisms of Y. pseudotuberculosis and Y. enterocolitica in orange juice under different pH conditions. Yersinia was inoculated in orange juice with adjusted pH levels of 3.9, 4.0, and 7.0 and stored at 4 C for 3, 24, 72 and 168 hours (h). The inter-and intra-species variation is significant to the pH and time of incubation variables (p<0.05). At 3.9 pH the CFU (colony forming units) count decreased significantly.At pH 3.9 and 4.0, Y. enterocolitica and Y. pseudotuberculosis survived for at least 30 days and 15 days, respectively. Yersinia that survived under low pH in orange juice revealed enhanced urease activity within 12 h of incubation. The attachment gene (ail) could not be detected by PCR in Y. enterocolitica from undiluted sample incubated for 24 h or longer. Moreover, the FesI-restriction profile was altered when Y. pseudotuberculosis was stored at pH 4.0 orange juice for 7 days. These results indicate that Yersinia could survive and grow at low pH and the survival mechanisms could also enable the bacteria to survive the stomach pH barrier to cause enteric infection.
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Affiliation(s)
- Woubit Abdela
- Department of Pathobiology, College of Veterinary Medicine, Nursing and Allied Health, Tuskegee University, AL 36088
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22
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Sabina Y, Rahman A, Ray RC, Montet D. Yersinia enterocolitica: Mode of Transmission, Molecular Insights of Virulence, and Pathogenesis of Infection. J Pathog 2011; 2011:429069. [PMID: 22567333 PMCID: PMC3335483 DOI: 10.4061/2011/429069] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 05/28/2011] [Accepted: 06/05/2011] [Indexed: 11/20/2022] Open
Abstract
Although Yersinia enterocolitica is usually transmitted through contaminated food and untreated water, occasional transmission such as human-to-human, animal-to-human and blood transfusion associated transmission have also identified in human disease. Of the six Y. enterocolitica biotypes, the virulence of the pathogenic biotypes, namely, 1B and 2-5 is attributed to the presence of a highly conserved 70-kb virulence plasmid, termed pYV/pCD and certain chromosomal genes. Some biotype 1A strains, despite lacking virulence plasmid (pYV) and traditional chromosomal virulence genes, are isolated frequently from humans with gastrointestinal diseases similar to that produced by isolates belonging known pathogenic biotypes. Y. enterocolitica pathogenic biotypes have evolved two major properties: the ability to penetrate the intestinal wall, which is thought to be controlled by plasmid genes, and the production of heat-stable enterotoxin, which is controlled by chromosomal genes.
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Affiliation(s)
- Yeasmin Sabina
- Department of Genetic Engineering and Biotechnology, University of Dhaka, Dhaka 1000, Bangladesh
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23
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Balakrishna K, Radhika M, Murali HS, Batra HV, Bawa AS. Specific identification of pathogenic Yersinia enterocolitica by monoclonal antibodies generated against recombinant attachment invasion locus (rAil) protein. World J Microbiol Biotechnol 2011; 28:533-9. [PMID: 22806848 DOI: 10.1007/s11274-011-0844-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Accepted: 07/08/2011] [Indexed: 11/30/2022]
Abstract
Classical pathogenic strains of Yersinia enterocolitica produce a 17 kDa outer membrane protein, Ail (attachment-invasion locus), which mediates bacterial attachment to some cultures epithelial cell lines and invasion of others. In the present study, hybridomas were developed for the production of monoclonal antibodies (MAbs) against Ail protein of Y. enterocolitica. A set of five stabilized hybridoma cell lines were generated, of which, two MAbs, YEA 302 and YEA 303, exhibited specific reaction to the native Ail protein (17 kDa) present in whole cell lysate of Y. enterocolitica strains beside having reaction with rAil. The other three MAbs, YEA 5, 17 and 32, had some cross reactions with proteins other than Ail. Two out of five MAbs were IgG1, two were IgG2b and one in IgM in nature. MAbs (YEA 302 and YEA 303) did not show any cross-reaction with whole cell lysate of Brucella abortus, Vibrio cholerae, Salmonella typhimurium and Escherichia coli and other species of Enterobacteriaceae including Y. pestis in ELISA and Western blot analysis. The presence of Ail protein among the strains recovered from pork and milk samples was evaluated by these sets of MAbs and the results were compared with the duplex PCR. Collectively, the data suggest that these MAbs may have the potential for their use in the detection of pathogenic Y. enterocolitica reliably, rapidly and at a relatively low cost.
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Affiliation(s)
- K Balakrishna
- Division of Microbiology, Defence Food Research Laboratory, Siddartha Nagar, Mysore, Karnataka, 570011, India.
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24
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Plesniak LA, Mahalakshmi R, Rypien C, Yang Y, Racic J, Marassi FM. Expression, refolding, and initial structural characterization of the Y. pestis Ail outer membrane protein in lipids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:482-9. [PMID: 20883662 DOI: 10.1016/j.bbamem.2010.09.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 09/17/2010] [Accepted: 09/21/2010] [Indexed: 01/05/2023]
Abstract
Ail is an outer membrane protein and virulence factor of Yersinia pestis, an extremely pathogenic, category A biothreat agent, responsible for precipitating massive human plague pandemics throughout history. Due to its key role in bacterial adhesion to host cells and bacterial resistance to host defense, Ail is a key target for anti-plague therapy. However, little information is available about the molecular aspects of its function and interactions with the human host, and the structure of Ail is not known. Here we describe the recombinant expression, purification, refolding, and sample preparation of Ail for solution and solid-state NMR structural studies in lipid micelles and lipid bilayers. The initial NMR and CD spectra show that Ail adopts a well-defined transmembrane β-sheet conformation in lipids.
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Affiliation(s)
- Leigh A Plesniak
- Sanford Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
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25
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Proteomic analysis of Neorickettsia sennetsu surface-exposed proteins and porin activity of the major surface protein P51. J Bacteriol 2010; 192:5898-905. [PMID: 20833807 DOI: 10.1128/jb.00632-10] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Neorickettsia sennetsu is an obligate intracellular bacterium of monocytes and macrophages and is the etiologic agent of human Sennetsu neorickettsiosis. Neorickettsia proteins expressed in mammalian host cells, including the surface proteins of Neorickettsia spp., have not been defined. In this paper, we isolated surface-exposed proteins from N. sennetsu by biotin surface labeling followed by streptavidin-affinity chromatography. Forty-two of the total of 936 (4.5%) N. sennetsu open reading frames (ORFs) were detected by liquid chromatography-tandem mass spectrometry (LC/MS/MS), including six hypothetical proteins. Among the major proteins identified were the two major β-barrel proteins: the 51-kDa antigen (P51) and Neorickettsia surface protein 3 (Nsp3). Immunofluorescence labeling not only confirmed surface exposure of these proteins but also showed rosary-like circumferential labeling with anti-P51 for the majority of bacteria and polar to diffuse punctate labeling with anti-Nsp3 for a minority of bacteria. We found that the isolated outer membrane of N. sennetsu had porin activity, as measured by a proteoliposome swelling assay. This activity allowed the diffusion of L-glutamine, the monosaccharides arabinose and glucose, and the tetrasaccharide stachyose, which could be inhibited with anti-P51 antibody. We purified native P51 and Nsp3 under nondenaturing conditions. When reconstituted into proteoliposomes, purified P51, but not Nsp3, exhibited prominent porin activity. This the first proteomic study of a Neorickettsia sp. showing new sets of proteins evolved as major surface proteins for Neorickettsia and the first identification of a porin for the genus Neorickettsia.
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Huang Y, Wang X, Cui Z, Yang Y, Xiao Y, Tang L, Kan B, Xu J, Jing H. Possible use of ail and foxA polymorphisms for detecting pathogenic Yersinia enterocolitica. BMC Microbiol 2010; 10:211. [PMID: 20691098 PMCID: PMC2924855 DOI: 10.1186/1471-2180-10-211] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Accepted: 08/07/2010] [Indexed: 11/17/2022] Open
Abstract
Background Yersinia enterocolitica is an enteric pathogen that invades the intestinal mucosa and proliferates within the lymphoid follicles (Peyer's patches). The attachment invasion locus (ail) mediates invasion by Y. enterocolitica and confers an invasive phenotype upon non-invasive E. coli; ail is the primary virulence factor of Y. enterocolitica. The ferrioxamine receptor (foxA) located on the Y. enterocolitica chromosome, together with its transport protein, transports a siderophore specific for ferric ion. Currently, ail is the primary target gene for nucleic acid detection of pathogenic Y. enterocolitica. Results The genes ail and foxA in 271 pathogenic and 27 non-pathogenic Y. enterocolitica strains isolated from China and 10 reference strains were sequenced, aligned, compared to the ail and foxA sequences of Yersinia enterocolitica subsp. enterocolitica 8081 (Genbank: NC_008800), and analyzed for sequence polymorphism. The ail from the 282 strains showed 3 sequence patterns: 277 strains of serotypes O:3, O:9 and O:5, 27 with identical nucleic acid sequences formed pattern A1; 4 strains of serotype 1B/O:8 with identical nucleic acid sequences formed pattern A2; and one Chinese isolate 2/O:9 formed pattern A3. In the primary coding region of the foxA ORF (Genebank: X60447 nt 433-1866; nt 28 to 1,461 in the ORF), the sequences formed 3 groups and were further divided into 8 sequence patterns. Conclusion The ail and foxA loci of pathogenic Y. enterocolitica have been analyzed. The ail sequence was highly conserved among the same serotype strains from different sources; and foxA was highly conserved among the pathogenic strains, although there was some sequence diversity. Fewer strains were used from outside China, which is a limitation of the study.
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Affiliation(s)
- Ying Huang
- National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, State Key Laboratory for Infectious Disease Prevention and Control, 102206, Beijing, China
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Chen YY, Wu CH, Lin JW, Weng SF, Tseng YH. Mutation of the gene encoding a major outer-membrane protein in Xanthomonas campestris pv. campestris causes pleiotropic effects, including loss of pathogenicity. MICROBIOLOGY-SGM 2010; 156:2842-2854. [PMID: 20522496 DOI: 10.1099/mic.0.039420-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Xanthomonas campestris pv. campestris (Xcc) is the phytopathogen that causes black rot in crucifers. The xanthan polysaccharide and extracellular enzymes produced by this organism are virulence factors, the expression of which is upregulated by Clp (CRP-like protein) and DSF (diffusible signal factor), which is synthesized by RpfF. It is also known that biofilm formation/dispersal, regulated by the effect of controlled synthesis of DSF on cell-cell signalling, is required for virulence. Furthermore, a deficiency in DSF causes cell aggregation with concomitant production of a gum-like substance that can be dispersed by addition of DSF or digested by exogenous endo-beta-1,4-mannanase expressed by Xcc. In this study, Western blotting of proteins from a mopB mutant (XcMopB) showed Xcc MopB to be the major outer-membrane protein (OMP); Xcc MopB shared over 97 % identity with homologues from other members of Xanthomonas. Similarly to the rpfF mutant, XcMopB formed aggregates with simultaneous production of a gummy substance, but these aggregates could not be dispersed by DSF or endo-beta-1,4-mannanase, indicating that different mechanisms were involved in aggregation. In addition, XcMopB showed surface deformation, altered OMP composition, impaired xanthan production, increased sensitivity to stressful conditions including SDS, elevated temperature and changes in pH, reduced adhesion and motility and defects in pathogenesis. The finding that the major OMP is required for pathogenicity is unprecedented in phytopathogenic bacteria.
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Affiliation(s)
- Yih-Yuan Chen
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Chieh-Hao Wu
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Juey-Wen Lin
- Institute of Biochemistry, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Shu-Fen Weng
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan, ROC
| | - Yi-Hsiung Tseng
- Institute of Microbiology, Immunology and Molecular Medicine, Tzu Chi University, Hualien 907, Taiwan, ROC
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Interaction of Yersinia with the gut: mechanisms of pathogenesis and immune evasion. Curr Top Microbiol Immunol 2010; 337:61-91. [PMID: 19812980 DOI: 10.1007/978-3-642-01846-6_3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Yersinia entercolitica and Yersinia pseudotuberculosis are human foodborne pathogens that interact extensively with tissues of the gut and the host's immune system to cause disease. As part of their pathogenic strategies, the Yersinia have evolved numerous ways to invade host tissues, gain essential nutrients, and evade host immunity. Technological advances over the last 10 years have revolutionized our understanding of host-pathogen interactions. The application of these new technologies has also shown that even well-understood pathogens such as the Yersinia have many surprises waiting to be revealed. The complex interaction with the host has made Yersinia a paradigm for understanding bacterial pathogenesis and the host response to invasive bacterial infections. This review examines the mechanisms of immune evasion employed by the Yersinia and highlights recent advances in understanding the host-pathogen interaction.
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Balakrishna K, Murali HS, Batra HV. Cloning, expression and characterization of attachment-invasion locus protein (Ail) of Yersinia enterocolitica and its utilization in rapid detection by immunoassays. Lett Appl Microbiol 2009; 50:131-7. [PMID: 20002570 DOI: 10.1111/j.1472-765x.2009.02755.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS Rapid detection of pathogenic Yersinia enterocolitica isolates by using antisera raised against recombinant attachment-invasion locus (Ail) protein. METHODS AND RESULTS The complete gene (471 bp) encoding for the Ail protein was amplified by PCR and cloned in pQE 30 UA vector. The recombinant clones were selected by polymerase chain reaction (PCR). Recombinant protein was expressed using induction with 1 mmol l(-1) final concentration of isopropylthiogalactoside (IPTG). Polyclonal antibodies were raised in mice against this purified recombinant protein. An indirect plate ELISA was standardized based on rAil protein for the detection of Y. enterocolitica. Western blot analysis with the sera raised against recombinant Ail protein exhibited reaction at 17 kDa region of the native Ail protein present in pathogenic Y. enterocolitica standard strains and strains isolated from pork samples suggesting that the antigenicity of recombinant Ail protein was similar to that of native Ail protein. Nonpathogenic Y. enterocolitica and the other species of Yersinia, namely, Y. pseudotuberculosis, Y. intermedia, Y. kristenseni, Y. fredrickseni and also the Enterobacteriaceae organisms tested were not found reacting to polyclonal antisera against this recombinant Ail protein. CONCLUSION The antibodies raised against recombinant Ail protein could specifically identify pathogenic Y. enterocolitica strains both by indirect plate ELISA and Western blot immunoassay. SIGNIFICANCE AND IMPACT OF THE STUDY The method developed in this study may find application in the detection of pathogenic Y. enterocolitica not only from food and environmental samples but also from clinical samples.
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Affiliation(s)
- K Balakrishna
- Division of Microbiology, Defence Food Research Laboratory, Mysore, Karnataka 570011, India.
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Functional mapping of YadA- and Ail-mediated binding of human factor H to Yersinia enterocolitica serotype O:3. Infect Immun 2008; 76:5016-27. [PMID: 18765735 DOI: 10.1128/iai.00314-08] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Yersinia enterocolitica is an enteric pathogen that exploits diverse means to survive in the human host. Upon Y. enterocolitica entry into the human host, bacteria sense and respond to variety of signals, one of which is the temperature. Temperature in particular has a profound impact on Y. enterocolitica gene expression, as most of its virulence factors are expressed exclusively at 37 degrees C. These include two outer membrane proteins, YadA and Ail, that function as adhesins and complement resistance (CR) factors. Both YadA and Ail bind the functionally active complement alternative pathway regulator factor H (FH). In this study, we characterized regions on both proteins involved in CR and the interaction with FH. Twenty-eight mutants having short (7 to 41 amino acids) internal deletions within the neck and stalk of YadA and two complement-sensitive site-directed Ail mutants were constructed to map the CR and FH binding regions of YadA and Ail. Functional analysis of the YadA mutants revealed that the stalk of YadA is required for both CR and FH binding and that FH appears to target several conformational and discontinuous sites of the YadA stalk. On the other hand, the complement-sensitive Ail mutants were not affected in FH binding. Our results also suggested that Ail- and YadA-mediated CR does not depend solely on FH binding.
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Kirjavainen V, Jarva H, Biedzka-Sarek M, Blom AM, Skurnik M, Meri S. Yersinia enterocolitica serum resistance proteins YadA and ail bind the complement regulator C4b-binding protein. PLoS Pathog 2008; 4:e1000140. [PMID: 18769718 PMCID: PMC2516929 DOI: 10.1371/journal.ppat.1000140] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Accepted: 08/01/2008] [Indexed: 02/01/2023] Open
Abstract
Many pathogens are equipped with factors providing resistance against the bactericidal action of complement. Yersinia enterocolitica, a Gram-negative enteric pathogen with invasive properties, efficiently resists the deleterious action of human complement. The major Y. enterocolitica serum resistance determinants include outer membrane proteins YadA and Ail. Lipopolysaccharide (LPS) O-antigen (O-ag) and outer core (OC) do not contribute directly to complement resistance. The aim of this study was to analyze a possible mechanism whereby Y. enterocolitica could inhibit the antibody-mediated classical pathway of complement activation. We show that Y. enterocolitica serotypes O:3, O:8, and O:9 bind C4b-binding protein (C4bp), an inhibitor of both the classical and lectin pathways of complement. To identify the C4bp receptors on Y. enterocolitica serotype O:3 surface, a set of mutants expressing YadA, Ail, O-ag, and OC in different combinations was tested for the ability to bind C4bp. The studies showed that both YadA and Ail acted as C4bp receptors. Ail-mediated C4bp binding, however, was blocked by the O-ag and OC, and could be observed only with mutants lacking these LPS structures. C4bp bound to Y. enterocolitica was functionally active and participated in the factor I-mediated degradation of C4b. These findings show that Y. enterocolitica uses two proteins, YadA and Ail, to bind C4bp. Binding of C4bp could help Y. enterocolitica to evade complement-mediated clearance in the human host. To cause disease in humans, pathogenic bacteria have to evade the versatile immune system of the host. An important part of innate immunity is the complement system that is composed of over 30 proteins on host cells and in blood able to detect and destroy foreign material. To survive, bacteria can bind complement regulator proteins onto their surfaces and thus inhibit the activation of complement. Previously, it has been shown that food-borne diarrhoea-causing Yersinia enterocolitica can survive in human serum because of two bacterial surface proteins, YadA and Ail. These proteins have been shown to bind a complement alternative pathway regulator, factor H. Here, we show that both proteins also bind the classical and lectin pathway inhibitor, C4b-binding protein. These results together explain the serum resistance of Y. enterocolitica. The ability to evade complement attack is apparently important for the pathogenicity of Yersinia enterocolitica.
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Affiliation(s)
- Vesa Kirjavainen
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Hanna Jarva
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
- Helsinki University Central Hospital Laboratory Diagnostics, Helsinki, Finland
| | - Marta Biedzka-Sarek
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Anna M. Blom
- Department of Laboratory Medicine, Malmö University Hospital, University of Lund, Malmö, Sweden
| | - Mikael Skurnik
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
- Helsinki University Central Hospital Laboratory Diagnostics, Helsinki, Finland
| | - Seppo Meri
- Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland
- Helsinki University Central Hospital Laboratory Diagnostics, Helsinki, Finland
- * E-mail:
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Characterization of complement factor H binding to Yersinia enterocolitica serotype O:3. Infect Immun 2008; 76:4100-9. [PMID: 18625735 DOI: 10.1128/iai.00313-08] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
A number of bacteria bind factor H (FH), the negative regulator of the alternative complement pathway, to avoid complement-mediated killing. Here we show that a gram-negative enteric pathogen, Yersinia enterocolitica serotype O:3, uses two virulence-related outer membrane (OM) proteins to bind FH. With Y. enterocolitica O:3 mutant strains displaying different combinations of surface factors relevant to complement resistance, we demonstrated that the major receptor for FH is the OM protein YadA. Another OM protein, Ail, also contributes to FH binding provided that it is not blocked by distal parts of the lipopolysaccharide (i.e., the O antigen and the outer core hexasaccharide). Importantly, we demonstrated that surface-bound FH was functional; both YadA- and Ail-bound FH displayed cofactor activity for factor I-mediated cleavage of C3b. With truncated recombinant FH constructs, we located the binding site of Ail specifically to short consensus repeats 6 and 7 of FH, while YadA showed a novel type of FH-binding pattern and appears to bind FH throughout the entire FH molecule. We thus conclude that Y. enterocolitica, via YadA and Ail, recruits functionally active FH to its surface. FH binding appears to be an important mechanism of the complement resistance of this pathogen.
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Wang X, Qiu H, Jin D, Cui Z, Kan B, Xiao Y, Xu Y, Xia S, Wang H, Yang J, Wang X, Hu W, Xu J, Jing H. O:8 serotype Yersinia enterocolitica strains in China. Int J Food Microbiol 2008; 125:259-66. [DOI: 10.1016/j.ijfoodmicro.2008.04.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2007] [Revised: 04/01/2008] [Accepted: 04/17/2008] [Indexed: 11/29/2022]
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Zheng H, Sun Y, Mao Z, Jiang B. Investigation of virulence genes in clinical isolates of Yersinia enterocolitica. ACTA ACUST UNITED AC 2008; 53:368-74. [PMID: 18557936 DOI: 10.1111/j.1574-695x.2008.00436.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, we aimed to investigate the distribution of virulence genes in clinical isolates of pathogenic Yersinia enterocolitica. Two thousand six hundred stool samples were collected from 2600 patients with diarrhea, and were tested using the culture method and real-time PCR. Then, all isolates of pathogenic Y. enterocolitica cultured from the culture method were examined for virulence genes (inv, ail, ystA, ystB, ystC, yadA, virF) by PCR and for the presence of plasmid by four phenotypic tests. As a result, 160 pathogenic strains were successfully detected by the culture method, including bio/serotype 1A/unknown (4), 1B/unknown (8), 2/O:9 (39), 2/unknown (7), 3/O:3 (22), 3/unknown (6), 4/O:3 (55), 4/unknown (10) and 5/unknown (9). The positive rate of virulence genes tested in 160 isolates was inv (100%), ail (94%), ystA (93%), ystB (7.5%), ystC (5%), yadA (89%) and virF (82%) while the phenotypic test included autoagglutination (87%), binding of crystal violet (89%), calcium-dependent growth (74%) and Congo red absorption (78%), respectively. Finally, we found that not all pathogenic Y. enterocolitica necessarily carry all traditional virulence genes in both chromosomes and plasmids to cause illness. Perhaps, some of them, lacking some traditional virulence genes, contain other unknown virulence markers that interact with each other and play an important role in the diverse pathogenesis of pathogenic Y. enterocolitica.
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Affiliation(s)
- Haoxuan Zheng
- Institute of Digestive Disease, Nanfang Hospital, Southern Medical University, Guangzhou, China
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Complete genome sequence of uropathogenic Proteus mirabilis, a master of both adherence and motility. J Bacteriol 2008; 190:4027-37. [PMID: 18375554 PMCID: PMC2395036 DOI: 10.1128/jb.01981-07] [Citation(s) in RCA: 188] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The gram-negative enteric bacterium Proteus mirabilis is a frequent cause of urinary tract infections in individuals with long-term indwelling catheters or with complicated urinary tracts (e.g., due to spinal cord injury or anatomic abnormality). P. mirabilis bacteriuria may lead to acute pyelonephritis, fever, and bacteremia. Most notoriously, this pathogen uses urease to catalyze the formation of kidney and bladder stones or to encrust or obstruct indwelling urinary catheters. Here we report the complete genome sequence of P. mirabilis HI4320, a representative strain cultured in our laboratory from the urine of a nursing home patient with a long-term (> or =30 days) indwelling urinary catheter. The genome is 4.063 Mb long and has a G+C content of 38.88%. There is a single plasmid consisting of 36,289 nucleotides. Annotation of the genome identified 3,685 coding sequences and seven rRNA loci. Analysis of the sequence confirmed the presence of previously identified virulence determinants, as well as a contiguous 54-kb flagellar regulon and 17 types of fimbriae. Genes encoding a potential type III secretion system were identified on a low-G+C-content genomic island containing 24 intact genes that appear to encode all components necessary to assemble a type III secretion system needle complex. In addition, the P. mirabilis HI4320 genome possesses four tandem copies of the zapE metalloprotease gene, genes encoding six putative autotransporters, an extension of the atf fimbrial operon to six genes, including an mrpJ homolog, and genes encoding at least five iron uptake mechanisms, two potential type IV secretion systems, and 16 two-component regulators.
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Kolodziejek AM, Sinclair DJ, Seo KS, Schnider DR, Deobald CF, Rohde HN, Viall AK, Minnich SS, Hovde CJ, Minnich SA, Bohach GA. Phenotypic characterization of OmpX, an Ail homologue of Yersinia pestis KIM. MICROBIOLOGY-SGM 2007; 153:2941-2951. [PMID: 17768237 DOI: 10.1099/mic.0.2006/005694-0] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The goal of this study was to characterize the Yersinia pestis KIM OmpX protein. Yersinia spp. provide a model for studying several virulence processes including attachment to, and internalization by, host cells. For Yersinia enterocolitica and Yersinia pseudotuberculosis, Ail, YadA and Inv, have been implicated in these processes. In Y. pestis, YadA and Inv are inactivated. Genomic analysis of two Y. pestis strains revealed four loci with sequence homology to Ail. One of these genes, designated y1324 in the Y. pestis KIM database, encodes a protein designated OmpX. The mature protein has a predicted molecular mass of 17.47 kDa, shares approximately 70 % sequence identity with Y. enterocolitica Ail, and has an identical homologue, designated Ail, in the Y. pestis CO92 database. The present study compared the Y. pestis KIM6(+) parental strain with a mutant derivative having an engineered disruption of the OmpX structural gene. The parental strain (and a merodiploid control strain) expressed OmpX at 28 and 37 degrees C, and the protein was detectable throughout all phases of growth. OmpX was required for efficient adherence to, and internalization by, cultured HEp-2 cell monolayers and conferred resistance to the bactericidal effect of human serum. Deletion of ompX resulted in a significantly reduced autoaggregation phenotype and loss of pellicle formation in vitro. These results suggest that Y. pestis OmpX shares functional homology with Y. enterocolitica Ail in adherence, internalization into epithelial cells and serum resistance.
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Affiliation(s)
- Anna M Kolodziejek
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Dylan J Sinclair
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Keun S Seo
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Darren R Schnider
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Claudia F Deobald
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Harold N Rohde
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Austin K Viall
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Scott S Minnich
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Carolyn J Hovde
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Scott A Minnich
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
| | - Gregory A Bohach
- Department of Microbiology, Molecular Biology, and Biochemistry, University of Idaho, Moscow, ID 83844-3052, USA
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Resistance of Yersinia pestis to complement-dependent killing is mediated by the Ail outer membrane protein. Infect Immun 2007; 76:612-22. [PMID: 18025094 DOI: 10.1128/iai.01125-07] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Yersinia pestis, the causative agent of plague, must survive in blood in order to cause disease and to be transmitted from host to host by fleas. Members of the Ail/Lom family of outer membrane proteins provide protection from complement-dependent killing for a number of pathogenic bacteria. The Y. pestis KIM genome is predicted to encode four Ail/Lom family proteins. Y. pestis mutants specifically deficient in expression of each of these proteins were constructed using lambda Red-mediated recombination. The Ail outer membrane protein was essential for Y. pestis to resist complement-mediated killing at 26 and 37 degrees C. Ail was expressed at high levels at both 26 and 37 degrees C, but not at 6 degrees C. Expression of Ail in Escherichia coli provided protection from the bactericidal activity of complement. High-level expression of the three other Y. pestis Ail/Lom family proteins (the y1682, y2034, and y2446 proteins) provided no protection against complement-mediated bacterial killing. A Y. pestis ail deletion mutant was rapidly killed by sera obtained from all mammals tested except mouse serum. The role of Ail in infection of mice, Caenorhabditis elegans, and fleas was investigated.
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Fredriksson-Ahomaa M, Stolle A, Stephan R. Prevalence of pathogenic Yersinia enterocolitica in pigs slaughtered at a Swiss abattoir. Int J Food Microbiol 2007; 119:207-12. [PMID: 17727997 DOI: 10.1016/j.ijfoodmicro.2007.07.050] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 07/23/2007] [Accepted: 07/24/2007] [Indexed: 10/23/2022]
Abstract
Human yersiniosis is the third most common enteric disease after campylobacteriosis and salmonellosis in many European countries. However, epidemiological data on the prevalence of pathogenic Yersinia enterocolitica in animals and humans is insufficient. Pigs are assumed to be the main reservoir of pathogenic Y. enterocolitica because pig is so far the only animal species from which pathogenic strains have frequently been isolated. This work was conducted to study the frequency of ail-positive Y. enterocolitica in pigs slaughtered at a Swiss abattoir. In total, 212 pig tonsils were screened by real-time PCR and culture methods. The prevalence rate of ail-positive Y. enterocolitica in pigs at slaughter was 88% and 34% with PCR and culture methods, respectively. The 148 ail-positive isolates from the 72 culture-positive tonsils were bio-and serotyped. The most common bioserotype was 4/O:3 found in 96% (69/72) of the culture-positive samples. However, pig was also shown to be a reservoir for ail-positive Y. enterocolitica belonging to bioserotypes 2/O:5,27 and 2/O:9, which were detected in 8% (6/72) and 1% (1/72) of the culture-positive samples, respectively. Using PFGE with NotI, only a limited number of different patterns was found. In all, 6 genotypes were obtained when 86 isolates of bioserotype 4/O:3 from 69 samples were characterised and two genotypes (N1 and N4) dominated. The biotype 4 differs clearly from biotype 2 with PFGE. Antimicrobial resistance testing of 77 ail-positive Y. enterocolitica isolates from 72 samples studied with disc-diffusion revealed that all strains were sensitive to cefotaxime, chloramphenicol, ciprofloxacin and tetracycline, which are antimicrobial agents used for treatment of human disease. The isolates of bioserotype 2/O:5,27 differed from the isolates of bioserotypes 2/O:9 and 4/O:3 in resistance to ampicillin and amoxicillin/clavulanic acid.
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Affiliation(s)
- Maria Fredriksson-Ahomaa
- Institute of Hygiene and Technology of Food of Animal Origin, Faculty of Veterinary Medicine, Ludwig-Maximilian University, Munich, Germany.
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Platt-Samoraj A, Ugorski M, Szweda W, Szczerba-Turek A, Wojciech K, Procajło Z. Analysis of the presence of ail, ystA and ystB genes in Yersinia enterocolitica strains isolated from aborting sows and aborted fetuses. ACTA ACUST UNITED AC 2006; 53:341-6. [PMID: 16930279 DOI: 10.1111/j.1439-0450.2006.00969.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Forty-five Yersinia enterocolitica strains isolated from aborted fetuses and placentas and from vaginal and rectal swabs of aborting sows were subjected to serotyping, biochemical typing and polymerase chain reaction multiplex analyses to detect the presence of the ail, yst A and ystB genes. The isolates were recovered from the internal organs (tonsil, lung, liver, spleen, kidney, mesentheric lymph nodes, small intestine and rectal intestine) of 18 (18.6%) of 97 aborted fetuses examined, two (8%) of 25 aborted placentas and 27 (15.8%) of 172 examined aborting sows. Serotyping of Y. enterocolitica revealed that only six (13.3%) of the examined isolates belonged to serotype O:3, with a considerable number of isolates (31.1%) having serotype O:5, while biochemical studies showed that as many as 40 of the 45 strains belonged to biotype 1A. As expected, the Y. enterocolitica strains of bioserotype 4/O:3 contained ail and ystA genes, while strains of biotype 1A contained only the ystB gene.
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Affiliation(s)
- A Platt-Samoraj
- Department of Infectious and Invasive Diseases, Faculty of Veterinary Medicine, University of Warmia and Mazury, ul. Oczapowskiego 13, 10-719 Olsztyn, Poland.
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40
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Logsdon LK, Mecsas J. A non-invasive quantitative assay to measure murine intestinal inflammation using the neutrophil marker lactoferrin. J Immunol Methods 2006; 313:183-90. [PMID: 16806255 DOI: 10.1016/j.jim.2006.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2006] [Revised: 05/01/2006] [Accepted: 05/04/2006] [Indexed: 10/24/2022]
Abstract
Intestinal inflammation in mice is most frequently assessed by histology or FACS, processes that necessitate sacrificing mice. We developed a lactoferrin ELISA for murine feces to quantify intestinal inflammation in mice with enteric infections or colitis. Levels of fecal lactoferrin, a protein secreted by activated neutrophils, were consistent with neutrophil infiltration as assessed by histology, indicating that this fecal lactoferrin ELISA is a good alternative to histology. The fecal lactoferrin ELISA provides a non-invasive, quantitative assessment of intestinal inflammation, which should facilitate longitudinal studies of the development of and/or therapies reducing intestinal inflammation in individual mice and reduce the number of mice needed for such studies.
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Affiliation(s)
- Lauren K Logsdon
- Department of Molecular Biology and Microbiology, Tufts University, 136 Harrison Ave, Boston, MA 02111, USA
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41
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Dupont M, Dé E, Chollet R, Chevalier J, Pagès JM. Enterobacter aerogenes OmpX, a cation-selective channel mar- and osmo-regulated. FEBS Lett 2004; 569:27-30. [PMID: 15225603 DOI: 10.1016/j.febslet.2004.05.047] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2004] [Revised: 05/05/2004] [Accepted: 05/12/2004] [Indexed: 11/15/2022]
Abstract
The ompX gene of Enterobacter aerogenes was cloned. Its overexpression induced a decrease in the major porin Omp36 production and consequently a beta-lactam resistance was noted. Purified outer membrane protein X (OmpX) was reconstituted into artificial membranes and formed ion channels with a conductance of 20 pS in 1 M NaCl and a cationic selectivity. Both MarA expression and high osmolarity induced a noticeable increase of the OmpX synthesis in the E. aerogenes ATCC 13048 strain. In addition, OmpX synthesis increased under conditions in which the expression of the E. aerogenes major non-specific porins, Omp36 and Omp35, decreased.
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Affiliation(s)
- Myrielle Dupont
- EA2197, IFR48, Faculté de Médecine, Université de la Méditerranée, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
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42
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Chiu CH, Su LH, Chu C. Salmonella enterica serotype Choleraesuis: epidemiology, pathogenesis, clinical disease, and treatment. Clin Microbiol Rev 2004; 17:311-22. [PMID: 15084503 PMCID: PMC387403 DOI: 10.1128/cmr.17.2.311-322.2004] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Nontyphoid Salmonella strains are important causes of reportable food-borne infection. Among more than 2,000 serotypes, Salmonella enterica serotype Choleraesuis shows the highest predilection to cause systemic infections in humans. The most feared complication of serotype Cholearesuis bacteremia in adults is the development of mycotic aneurysm, which previously was almost uniformally fatal. The advances in diagnostic techniques, surgical care, and antimicrobial therapy have greatly improved the survival of these patients. However, the recent emergence of serotype Choleraesuis that is resistant to ampicillin, chloramphenicol, trimethoprim-sulfamethoxazole, and, notably, fluoroquinolone antibiotics has aroused concern about the use of these agents for the empirical treatment of systemic infection caused by this organism. In view of the serious implications of the situation, the chain of transmission and mechanism of resistance should be carefully studied to reduce the spread of infection and threat to human health. To date, there are no vaccines available to prevent serotype Choleraesuis infections in humans. The availability, in the near future, of the genome sequence of serotype Cholearesuis will facilitate the development of effective vaccines as well as the discovery of new targets for novel antimicrobial agents.
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Affiliation(s)
- Cheng-Hsun Chiu
- Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan.
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43
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Prouty AM, Brodsky IE, Manos J, Belas R, Falkow S, Gunn JS. Transcriptional regulation ofSalmonella entericaserovar Typhimurium genes by bile. ACTA ACUST UNITED AC 2004; 41:177-85. [PMID: 15145463 DOI: 10.1016/j.femsim.2004.03.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Revised: 03/04/2004] [Accepted: 03/07/2004] [Indexed: 01/17/2023]
Abstract
DNA microarrays and two-dimensional (2-D) gel electrophoresis were utilized to analyze the global effect of bile on transcription and protein synthesis in Salmonella enterica serovar Typhimurium. Two bile-regulated proteins, YciF and PagC, were identified by 2-D gel electrophoresis and mass spectrometry fingerprinting. The operon yciGFE-katN demonstrated increased transcriptional activity in the presence of bile. While this operon has previously been shown to be RpoS-regulated, data from this study suggested that yciGFE-katN is regulated by bile independent of RpoS. The PhoP-PhoQ-regulated PagC is decreased in the presence of bile. Characterization of the untranslated leader of pagC demonstrated that a 97-bp region is necessary for the bile-mediated repression of this promoter. Analysis of data from the DNA microarray revealed an effect of bile on important global mechanistic pathways in S. enterica serovar Typhimurium. Genes involved in type III secretion-mediated invasion of epithelial cells demonstrated an overall repression of transcription in the presence of bile, corroborating previously reported data from this laboratory [Infect. Immun. 68 (2000) 6763]. In addition, bile-mediated transcriptional repression of genes involved in flagellar biosynthesis and motility was observed. These data further demonstrate that bile is an important environmental signal sensed by Salmonella spp. and that bile plays a role in regulating bacterial gene expression in multiple virulence-associated pathways.
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Affiliation(s)
- A M Prouty
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., MC 7758, San Antonio, TX 78229-3900, USA
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44
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Lee TS, Lee SW, Seok WS, Yoo MY, Yoon JW, Park BK, Moon KD, Oh DH. Prevalence, antibiotic susceptibility, and virulence factors of Yersinia enterocolitica and related species from ready-to-eat vegetables available in Korea. J Food Prot 2004; 67:1123-7. [PMID: 15222537 DOI: 10.4315/0362-028x-67.6.1123] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A total of 673 ready-to-eat vegetable samples were collected in Korea from 2001 to 2002 and analyzed for the presence of Yersinia spp. We analyzed biotypes, serotypes, and susceptibility to 12 antibiotics and tested for virulence genes of pathogenic Yersinia enterocolitica isolates by PCR assay. Among the samples, 27 (4.0%) were found to be contaminated with Yersinia spp. Among the 27 strains of Yersinia spp. isolates, 18 strains (66.7%) of Y. enterocolitica, 5 strains (18.5%) of Y. frederiksenii, 3 strains (11.1%) of Y. intermedia, and 1 strain (3.7%) of Y. kristensenii were identified. According to the serotypes of Y. enterocolitica isolates, O:3 (11.1%) and O:5 (11.1%) were the most predominant, followed by O:8 (5.6%) and others (72.2%). For biotypes of Y. enterocolitica isolates, 1A (77.8%) was the most predominant, followed by 3B (11.1%), 3 (5.6%), and 5A (5.6%). Also, an antibiotic susceptibility test showed that Y. enterocolitica isolates were very susceptible to the antibiotics tested but highly resistant to ampicillin (94%), cephalothin (100%), and carbenicillin (83%). PCR assays with specific primers derived from yst and ail genes of Y. enterocolitica were applied to confirm the presence of pathogenic Y. enterocolitica. Among the 18 strains of Y. enterocolitica isolates, only 3 strains (O:3/1A, UT/3B, and UT/1A isolated from Chinese cabbage, onion, and spinach, respectively) were shown to have a virulence gene.
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Affiliation(s)
- Tex-Soo Lee
- Institute of Health and Environment of Kangwondo, Chunchon 200-702, Korea
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45
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Isberg RR, Van Nhieu GT. The mechanism of phagocytic uptake promoted by invasin-integrin interaction. Trends Cell Biol 2004; 5:120-4. [PMID: 14732167 DOI: 10.1016/s0962-8924(00)88962-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Many pathogenic bacterial species produce factors that promote their internalization by host cells. The crucial components for uptake of one such pathogen, Yersinia pseudotuberculosis, have been identified. Efficient uptake of this microorganism requires tight binding of the bacterial invasin protein to integrins on the cell surface. Internalization also involves coordination of signals responsible for cytoskeletal rearrangements and those involved in receptor-mediated endocytosis. A start is being made to define the proteins that are required for efficient completion of the internalization process.
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Affiliation(s)
- R R Isberg
- Howard Hughes Medical Institute and Dept of Microbiology and Molecular Biology, Tufts University School of Medicine, 136 Harrison Ave, Boston, MA 02111, USA
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46
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Burtscher C, Wuertz S. Evaluation of the use of PCR and reverse transcriptase PCR for detection of pathogenic bacteria in biosolids from anaerobic digestors and aerobic composters. Appl Environ Microbiol 2003; 69:4618-27. [PMID: 12902250 PMCID: PMC169064 DOI: 10.1128/aem.69.8.4618-4627.2003] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A PCR-based method and a reverse transcriptase PCR (RT-PCR)-based method were developed for the detection of pathogenic bacteria in organic waste, using Salmonella spp., Listeria monocytogenes, Yersinia enterocolitica, and Staphylococcus aureus as model organisms. In seeded organic waste samples, detection limits of less than 10 cells per g of organic waste were achieved after one-step enrichment of bacteria, isolation, and purification of DNA or RNA before PCR or RT-PCR amplification. To test the reproducibility and reliability of the newly developed methods, 46 unseeded samples were collected from diverse aerobic (composting) facilities and anaerobic digestors and analyzed by both culture-based classical and newly developed PCR-based procedures. No false-positive but some false-negative results were generated by the PCR- or RT-PCR-based methods after one-step enrichment when compared to the classical detection methods. The results indicated that the level of activity of the tested bacteria in unseeded samples was very low compared to that of freshly inoculated cells, preventing samples from reaching the cell density required for PCR-based detection after one-step enrichment. However, for Salmonella spp., a distinct PCR product could be obtained for all 22 nonamended samples that tested positive for Salmonella spp. by the classical detection procedure when a selective two-step enrichment (20 h in peptone water at 37 degrees C and 24 h in Rappaport Vassiliadis medium at 43 degrees C) was performed prior to nucleic acid extraction and PCR. Hence, the classical procedure was shortened, since cell plating and further differentiation of isolated colonies can be omitted, substituted for by highly sensitive and reliable detection based on nucleic acid extraction and PCR. Similarly, 2 of the 22 samples in which Salmonella spp. were detected also tested positive for Listeria monocytogenes according to a two-step enrichment procedure followed by PCR, compared to 3 samples that tested positive when classical isolation procedures were followed. The study shows that selective two-step enrichment is useful when very low numbers of bacterial pathogens must be detected in organic waste materials, such as biosolids. There were no false-positive results derived from DNA of dead cells in the waste sample, suggesting that it is not necessary to perform RT-PCR analyses when PCR is combined with selective enrichment. Large numbers of added nontarget bacteria did not affect detection of Salmonella spp., L. monocytogenes, and Y. enterocolitica but increased the detection limit of Staphylococcus aureus from <10 to 10(4) CFU/g of organic waste. Overall, the detection methods developed using seeded organic waste samples from one waste treatment facility (WTF) needed to be modified for satisfactory detection of pathogens in samples from other WTFs, emphasizing the need for extensive field testing of laboratory-derived PCR protocols. A survey of 13 WTFs in Germany revealed that all facilities complied with the German Biowaste Ordinance, which mandates that the end product after anaerobic digestion or aerobic composting be free of Salmonella In addition, all biosolids were free of L. monocytogenes, Staphylococcus aureus, and Y. enterocolitica, as evidenced by both classical and PCR-based detection methods.
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Affiliation(s)
- Carola Burtscher
- Institute of Water Quality Control and Waste Management, Technical University of Munich, D-85748 Garching, Germany
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47
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Thoerner P, Bin Kingombe CI, Bögli-Stuber K, Bissig-Choisat B, Wassenaar TM, Frey J, Jemmi T. PCR detection of virulence genes in Yersinia enterocolitica and Yersinia pseudotuberculosis and investigation of virulence gene distribution. Appl Environ Microbiol 2003; 69:1810-6. [PMID: 12620874 PMCID: PMC150046 DOI: 10.1128/aem.69.3.1810-1816.2003] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PCR-based assays were developed for the detection of plasmid- and chromosome-borne virulence genes in Yersinia enterocolitica and Yersinia pseudotuberculosis, to investigate the distribution of these genes in isolates from various sources. The results of PCR genotyping, based on 5 virulence-associated genes of 140 strains of Y. enterocolitica, were compared to phenotypic tests, such as biotyping and serotyping, and to virulence plasmid-associated properties such as calcium-dependent growth at 37 degrees C and Congo red uptake. The specificity of the PCR results was validated by hybridization. Genotyping data correlated well with biotype data, and most biotypes resulted in (nearly) homogeneous genotypes for the chromosomal virulence genes (ystA, ystB, and ail); however, plasmid-borne genes (yadA and virF) were detected with variable efficiency, due to heterogeneity within the bacterial population for the presence of the virulence plasmid. Of the virulence genes, only ystB was present in biotype 1A; however, within this biotype, pathogenic and apathogenic isolates could not be distinguished based on the detection of virulence genes. Forty Y. pseudotuberculosis isolates were tested by PCR for the presence of inv, yadA, and lcrF. All isolates were inv positive, and 88% of the isolates contained the virulence plasmid genes yadA and lcrF. In conclusion, this study shows that genotyping of Yersinia spp., based on both chromosome- and plasmid-borne virulence genes, is feasible and informative and can provide a rapid and reliable genotypic characterization of field isolates.
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Affiliation(s)
- P Thoerner
- Section of Microbiology, Federal Veterinary Office, Schwarzenburgstrasse 161, CH-3003 Bern-Liebefeld, Switzerland
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48
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Komatsuzawa H, Asakawa R, Kawai T, Ochiai K, Fujiwara T, Taubman MA, Ohara M, Kurihara H, Sugai M. Identification of six major outer membrane proteins from Actinobacillus actinomycetemcomitans. Gene 2002; 288:195-201. [PMID: 12034509 DOI: 10.1016/s0378-1119(02)00500-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have identified six major sarcosyl-insoluble outer membrane proteins (Omp) of Actinobacillus actinomycetemcomitans Y4, and designated them as Omp100, Omp64, Omp39, Omp29, Omp18 and Omp16 according to the molecular mass. A similar N-terminal sequence was found in the first 15 amino acid residues of Omp16 and Omp18. The N-terminal sequence of Omp29 matched perfectly with the sequence previously identified. We cloned and determined the DNA sequences of three complete genes encoding Omp100, Omp64 and Omp18/16, and one incomplete gene encoding Omp39. Each Omp revealed homologies with some bacterial virulence factors responsible for adhesion, invasion, serum resistance, or protein antigenicity. Serum from patients with periodontitis suspected to be related to A. actinomycetemcomintans infection strongly reacted with Omp100, Omp29 and Omp16 as did serum from mice immunized with A. actinomycetemcomitans Y4 whole bacteria. These findings suggest that Omps of A. actinomycetemcomitans can be associated with periodontal disease.
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Affiliation(s)
- Hitoshi Komatsuzawa
- Department of Microbiology, Hiroshima University Faculty of Dentistry, Kasumi 1-2-3, Minami-ku, Hiroshima City, Japan.
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49
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Fleckenstein JM, Holland JT, Hasty DL. Interaction of an uuter membrane protein of enterotoxigenic Escherichia coli with cell surface heparan sulfate proteoglycans. Infect Immun 2002; 70:1530-7. [PMID: 11854241 PMCID: PMC127767 DOI: 10.1128/iai.70.3.1530-1537.2002] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We have previously shown that enterotoxigenic invasion protein A (Tia), a 25-kDa outer membrane protein encoded on an apparent pathogenicity island of enterotoxigenic Escherichia coli (ETEC) strain H10407, mediates attachment to and invasion into cultured human gastrointestinal epithelial cells. The epithelial cell receptor(s) for Tia has not been identified. Here we show that Tia interacts with cell surface heparan sulfate proteoglycans. Recombinant E. coli expressing Tia mediated invasion into wild-type epithelial cell lines but not invasion into proteoglycan-deficient cells. Furthermore, wild-type eukaryotic cells, but not proteoglycan-deficient eukaryotic cells, attached to immobilized polyhistidine-tagged recombinant Tia (rTia). Binding of epithelial cells to immobilized rTia was inhibited by exogenous heparan sulfate glycosaminoglycans but not by hyaluronic acid, dermatan sulfate, or chondroitin sulfate. Similarly, pretreatment of eukaryotic cells with heparinase I, but not pretreatment of eukaryotic cells with chrondroitinase ABC, inhibited attachment to rTia. In addition, we also observed heparin binding to both immobilized rTia and recombinant E. coli expressing Tia. Heparin binding was inhibited by a synthetic peptide representing a surface loop of Tia, as well as by antibodies directed against this peptide. Additional studies indicated that Tia, as a prokaryotic heparin binding protein, may also interact via sulfated proteoglycan molecular bridges with a number of mammalian heparan sulfate binding proteins. These findings suggest that the binding of Tia to host epithelial cells is mediated at least in part through heparan sulfate proteoglycans and that ETEC belongs on the growing list of pathogens that utilize these ubiquitous cell surface molecules as receptors.
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Affiliation(s)
- James M Fleckenstein
- Medicine Services, Veterans Affairs Medical Center, Memphis, Tennessee 38104, USA.
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50
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Wannet WJ, Reessink M, Brunings HA, Maas HM. Detection of pathogenic Yersinia enterocolitica by a rapid and sensitive duplex PCR assay. J Clin Microbiol 2001; 39:4483-6. [PMID: 11724866 PMCID: PMC88570 DOI: 10.1128/jcm.39.12.4483-4486.2001] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A duplex PCR assay targeting the ail and 16S rRNA genes of Yersinia enterocolitica was developed to specifically identify pathogenic Y. enterocolitica from pure culture. Validation of the assay was performed with 215 clinical Yersinia strains and 40 strains of other bacterial species. Within an assay time of 4 h, this assay offers a very specific, reliable, and inexpensive alternative to the conventional phenotypic assays used in clinical laboratories to identify pathogenic Y. enterocolitica.
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Affiliation(s)
- W J Wannet
- National Institute of Public Health and the Environment, Bilthoven, The Netherlands.
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