1
|
Wang F, Sun H, Kang C, Yan J, Chen J, Feng X, Yang B. Genomic island-encoded regulatory proteins in enterohemorrhagic Escherichia coli O157:H7. Virulence 2024; 15:2313407. [PMID: 38357901 PMCID: PMC10877973 DOI: 10.1080/21505594.2024.2313407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/23/2024] [Indexed: 02/16/2024] Open
Abstract
Enterohemorrhagic Escherichia coli (EHEC) is an important zoonotic pathogen that is a major cause of foodborne diseases in most developed and developing countries and can cause uncomplicated diarrhoea, haemorrhagic colitis, and haemolytic uraemic syndrome. O islands (OIs), which are unique genomic islands in EHEC O157:H7, are composed of 177 isolated genomic features and harbour 26% of the total genes that are absent in the non-pathogenic E. coli K-12 genome. In the last twenty years, many OI-encoded proteins have been characterized, including proteins regulating virulence, motility, and acid resistance. Given the critical role of regulatory proteins in the systematic and hierarchical regulation of bacterial biological processes, this review summarizes the OI-encoded regulatory proteins in EHEC O157:H7 characterized to date, emphasizing OI-encoded regulatory proteins for bacterial virulence, motility, and acid resistance. This summary will be significant for further exploration and understanding of the virulence and pathogenesis of EHEC O157:H7.
Collapse
Affiliation(s)
- Fang Wang
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
- Intensive Care Unit, Shenzhen Institute of Translational Medicine, Health Science Center, The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Hongmin Sun
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
| | - Chenbo Kang
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
| | - Jun Yan
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
| | - Jingnan Chen
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
| | - Xuequan Feng
- Tianjin First Central Hospital, Nankai University, Tianjin, China
| | - Bin Yang
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China
| |
Collapse
|
2
|
Chettri D, Chirania M, Boro D, Verma AK. Glycoconjugates: Advances in modern medicines and human health. Life Sci 2024; 348:122689. [PMID: 38710281 DOI: 10.1016/j.lfs.2024.122689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/23/2024] [Accepted: 05/03/2024] [Indexed: 05/08/2024]
Abstract
Glycans and their glycoconjugates are complex biomolecules that are crucial for various biological processes. Glycoconjugates are found in all domains of life. They are covalently linked to key biomolecules such as proteins and lipids to play a pivotal role in cell signaling, adhesion, and recognition. The diversity of glycan structures and the associated complexity of glycoconjugates is the reason for their role in intricate biosynthetic pathways. Glycoconjugates play an important role in various diseases where they are actively involved in the immune response as well as in the pathogenicity of infectious diseases. In addition, various autoimmune diseases have been linked to glycosylation defects of different biomolecules, making them an important molecule in the field of medicine. The glycoconjugates have been explored for the development of therapeutics and vaccines, representing a breakthrough in medical science. They also hold significance in research studies to understand the mechanisms behind various biological processes. Finally, glycoconjugates have found an emerging role in various industrial and environmental applications which have been discussed here.
Collapse
Affiliation(s)
- Dixita Chettri
- Department of Microbiology, Sikkim University, Gangtok, Sikkim 737102, India
| | - Manisha Chirania
- Department of Microbiology, Sikkim University, Gangtok, Sikkim 737102, India
| | - Deepjyoti Boro
- Department of Microbiology, Sikkim University, Gangtok, Sikkim 737102, India
| | - Anil Kumar Verma
- Department of Microbiology, Sikkim University, Gangtok, Sikkim 737102, India.
| |
Collapse
|
3
|
Yinur D, Moges B, Hassen A, Tessema TS. Loop mediated isothermal amplification as a molecular diagnostic assay: Application and evaluation for detection of Enterohaemorrhagic Escherichia coli (O157:H7). Pract Lab Med 2023; 37:e00333. [PMID: 37693632 PMCID: PMC10492192 DOI: 10.1016/j.plabm.2023.e00333] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 07/27/2023] [Accepted: 08/25/2023] [Indexed: 09/12/2023] Open
Abstract
Purpose This study aimed at evaluating the performance of the Loop Mediated Isothermal Amplification (LAMP) diagnostic test, which targets the putative Fimbria protein-encoding gene (Z3276) for rapid and specific detection of locally isolated enterohemorrhagic Escherichia coli (EHEC) O157:H7. Results A total number of 40 locally available bacteria isolates and standard strains, among them 6 entrohemorrhagic (O157:H7) and 10 entropathogenic E. coli, 7 non diarrheic E. coli strains and 13 non entrohemorrhagic shiga toxic (stx) E. coli isolates as well as 4 pathogenic non E. coli species were used to optimize and evaluate the LAMP assay. The LAMP amplified DNA samples were visualized as turbid DNA both by naked eye and gel electrophoresis followed by staining. The assay had a sensitivity of 100% (6/6), a specificity of 97.05% (33/34), and an efficiency of 97.5% (39/40). The assay was also exhibited with 100% negative predicted value and 85.7% positive predicted value. The LAMP assay was also 10-fold more sensitive than the conventional PCR assay; sensitivity was determined by serial dilution. The results of LAMP and the PCR tests showed very high agreement (k = 0.97) in the detection of the bacteria studied. Conclusion Compared with the performance of PCR and SMAC, LAMP assay was better in terms of efficiency, rapidity and cost-effectiveness, which can be used as a point-care diagnostic test in resource-limited laboratories.
Collapse
Affiliation(s)
- Degisew Yinur
- Department of Medical Biotechnology, Institute of Biotechnology, University of Gondar, Gondar, Ethiopia
| | - Biniam Moges
- Department of Biotechnology, Debre Berhan University, Debre Berhan, Ethiopia
| | - Aliyi Hassen
- Department of Biotechnology, Ambo University, Ambo, Ethiopia
| | | |
Collapse
|
4
|
Bova RA, Lamont AC, Picou TJ, Ho VB, Gilchrist KH, Melton-Celsa AR. Shiga Toxin (Stx) Type 1a and Stx2a Translocate through a Three-Layer Intestinal Model. Toxins (Basel) 2023; 15:toxins15030207. [PMID: 36977098 PMCID: PMC10054274 DOI: 10.3390/toxins15030207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/27/2023] [Accepted: 03/08/2023] [Indexed: 03/12/2023] Open
Abstract
Shiga toxins (Stxs) produced by ingested E. coli can induce hemolytic uremic syndrome after crossing the intact intestinal barrier, entering the bloodstream, and targeting endothelial cells in the kidney. The method(s) by which the toxins reach the bloodstream are not fully defined. Here, we used two polarized cell models to evaluate Stx translocation: (i) a single-layer primary colonic epithelial cell model and (ii) a three-cell-layer model with colonic epithelial cells, myofibroblasts, and colonic endothelial cells. We traced the movement of Stx types 1a and 2a across the barrier models by measuring the toxicity of apical and basolateral media on Vero cells. We found that Stx1a and Stx2a crossed both models in either direction. However, approximately 10-fold more Stx translocated in the three-layer model as compared to the single-layer model. Overall, the percentage of toxin that translocated was about 0.01% in the epithelial-cell-only model but up to 0.09% in the three-cell-layer model. In both models, approximately 3- to 4-fold more Stx2a translocated than Stx1a. Infection of the three-cell-layer model with Stx-producing Escherichia coli (STEC) strains showed that serotype O157:H7 STEC reduced barrier function in the model and that the damage was not dependent on the presence of the eae gene. Infection of the three-layer model with O26:H11 STEC strain TW08571 (Stx1a+ and Stx2a+), however, allowed translocation of modest amounts of Stx without reducing barrier function. Deletion of stx2a from TW08571 or the use of anti-Stx1 antibody prevented translocation of toxin. Our results suggest that single-cell models may underestimate the amount of Stx translocation and that the more biomimetic three-layer model is suited for Stx translocation inhibitor studies.
Collapse
Affiliation(s)
- Rebecca A. Bova
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
- Center for Biotechnology (4DBio3), Department of Radiology and Radiological Sciences, Uniformed Services University, Bethesda, MD 20814, USA
- The Geneva Foundation, Tacoma, WA 98402, USA
| | - Andrew C. Lamont
- Center for Biotechnology (4DBio3), Department of Radiology and Radiological Sciences, Uniformed Services University, Bethesda, MD 20814, USA
- The Geneva Foundation, Tacoma, WA 98402, USA
| | - Theodore J. Picou
- Center for Biotechnology (4DBio3), Department of Radiology and Radiological Sciences, Uniformed Services University, Bethesda, MD 20814, USA
- The Geneva Foundation, Tacoma, WA 98402, USA
| | - Vincent B. Ho
- Center for Biotechnology (4DBio3), Department of Radiology and Radiological Sciences, Uniformed Services University, Bethesda, MD 20814, USA
| | - Kristin H. Gilchrist
- Center for Biotechnology (4DBio3), Department of Radiology and Radiological Sciences, Uniformed Services University, Bethesda, MD 20814, USA
- The Geneva Foundation, Tacoma, WA 98402, USA
| | - Angela R. Melton-Celsa
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
- Correspondence:
| |
Collapse
|
5
|
Samiei H, Nazarian S, Hajizade A, Kordbacheh E. In silico design, production and immunization evaluation of a recombinant bivalent fusion protein candidate vaccine against E. coli O157:H7. Int Immunopharmacol 2023; 114:109464. [PMID: 36450206 DOI: 10.1016/j.intimp.2022.109464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 10/20/2022] [Accepted: 11/12/2022] [Indexed: 11/29/2022]
Abstract
In silico techniques are highly suited for both the discovery of new and development of available vaccines. Escherichia coli O157: H7, a main cause of food poisoning can infect humans through the consumption of contaminated water or food. Vaccination is a choice strategy to combat the bacterium. In the present study, we designed, expressed and purified a chimeric protein comprising two antigens of Escherichia coli O157: H7, including intimin and flagellin proteins, as a vaccine candidate and evaluated its immunization ability in mice. Thein silicoresults showed that the proposed antigen has a high antigenicity and conformation to be used as a potent vaccine candidate. The protein was successfully expressed in E. coli expression system with a proper level of expression (0/8g/L). Immunization evaluation showed that the protein is able to evoke the mice's humoral immunity and can confer a protective immunity against E. coli O157:H7, so that 80 % of the immunized animals were survived following the intraperitoneal injection of 100 LD50 of the live bacteria. Shedding analysis also showed the protectivity power of the protein. Bacterial excretion in control animals remained stable at about 108 CFU after 15 days, while the excreted bacteria in the feces of immunized mice's decreased to about 102 after the same time. According to the results, the proposed protein is able to stimulate the immune responses of mice and protect them against E. coli O157:H7.
Collapse
Affiliation(s)
- Hossein Samiei
- Department of Medical Biotechnology and Nanotechnology, School of Medicine, Mashhad University of Medical Sciences Mashhad, Iran
| | - Shahram Nazarian
- (b)Faculty of Science, Department of Biology, Imam Hossein University, Tehran, Iran.
| | - Abass Hajizade
- (b)Faculty of Science, Department of Biology, Imam Hossein University, Tehran, Iran.
| | - Emad Kordbacheh
- (b)Faculty of Science, Department of Biology, Imam Hossein University, Tehran, Iran
| |
Collapse
|
6
|
Fais S. Scientific Discoveries Supporting Theories in Science: From Thinking to Practice. Int J Mol Sci 2022; 23:ijms232315025. [PMID: 36499354 PMCID: PMC9739909 DOI: 10.3390/ijms232315025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 11/25/2022] [Indexed: 12/03/2022] Open
Abstract
The idea to propose this ambitious title for a Special Issue in the International Journal of Molecular Science came, on one hand, from my personal experience in research in medicine, lasting 41 years, which has often been inspired by chance [...].
Collapse
Affiliation(s)
- Stefano Fais
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy
| |
Collapse
|