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Mim MF, Sikder MH, Chowdhury MZH, Bhuiyan AUA, Zinan N, Islam SMN. The dynamic relationship between skin microbiomes and personal care products: A comprehensive review. Heliyon 2024; 10:e34549. [PMID: 39104505 PMCID: PMC11298934 DOI: 10.1016/j.heliyon.2024.e34549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 07/09/2024] [Accepted: 07/11/2024] [Indexed: 08/07/2024] Open
Abstract
Healthy skin reflects a healthy microbiome and vice versa. The contemporary society, marked by a sharp increase in skin irritation cases, has compelled researchers, dermatologists, and the cosmetics industry to investigate the correlation between skin microbiomes and the use of skincare products. Different cosmetics can change skin's normal flora to a varying degree -some changes can be detrimental, there are also instances where these alterations aid in restoring the skin microbiome. Previous studies using artificial skin models, metagenomic analysis, and culture-based approaches have suggested that skincare products play an important role in skin microbial alteration. This article assessed current knowledge on microbial shifts from daily use of various personal and skincare products. We have also introduced a readily applicable framework, synthesized from various observations, which can be employed to identify the normal skin microbiome and evaluate the impact of personal care and skincare products on it. We also discussed how lifestyle choice remake skin microbial makeup. Future studies are warranted to examine the effect of personal and skincare product usage on skin microbiome across various age groups, genders, and body sites with a multi-study approach.
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Affiliation(s)
- Mahjabin Ferdaous Mim
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - Mahmudul Hasan Sikder
- Department of Pharmacology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Md. Zahid Hasan Chowdhury
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - Ashkar-Ul-Alam Bhuiyan
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - Nayeematul Zinan
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - Shah Mohammad Naimul Islam
- Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
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Lepe BA, Zheng CR, Leddy OK, Allsup BL, Solomon SL, Bryson BD. Protease shaving of Mycobacterium tuberculosis facilitates vaccine antigen discovery and delivery of novel cargoes to the Mtb surface. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.02.601718. [PMID: 39005324 PMCID: PMC11245043 DOI: 10.1101/2024.07.02.601718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is the leading cause of infectious disease death and lacks a vaccine capable of protecting adults from pulmonary TB. Studies have shown that Mtb uses a variety of mechanisms to evade host immunity. Secreted Mtb proteins such as Type VII secretion system substrates have been characterized for their ability to modulate anti-Mtb immunity; however, studies of other pathogens such as Salmonella Typhi and Staphylococcus aureus have revealed that outer membrane proteins can also interact with the innate and adaptive immune system. The Mtb outer membrane proteome has received relatively less attention due to limited techniques available to interrogate this compartment. We filled this gap by deploying protease shaving and quantitative mass spectrometry to identify Mtb outer membrane proteins which serve as nodes in the Mtb-host interaction network. These analyses revealed several novel Mtb proteins on the Mtb surface largely derived from the PE/PPE class of Mtb proteins, including PPE18, a component of a leading Mtb vaccine candidate. We next exploited the localization of PPE18 to decorate the Mtb surface with heterologous proteins and deliver these surface-engineered Mtb to the phagosome. Together, these studies reveal potential novel targets for new Mtb vaccines as well as facilitate new approaches to study difficult to study cellular compartments during infection.
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Affiliation(s)
- Bianca A. Lepe
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
| | - Christine R. Zheng
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
| | - Owen K. Leddy
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
- Koch Institute for Integrative Cancer Research, MIT, Cambridge, USA
| | - Benjamin L. Allsup
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
| | - Sydney L. Solomon
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
| | - Bryan D. Bryson
- Department of Biological Engineering, MIT, Cambridge, USA
- Ragon Institute of Mass General, Harvard, and MIT, Cambridge, USA
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Ojo OT, Odeyemi AO. Non-Mycobacteria Tuberculosis in Africa: A Literature Review. Ethiop J Health Sci 2023; 33:913-918. [PMID: 38784502 PMCID: PMC11111205 DOI: 10.4314/ejhs.v33i5.21] [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: 04/19/2023] [Accepted: 06/01/2023] [Indexed: 05/25/2024] Open
Abstract
Background Non-tuberculous mycobacteria (NTM) have been reported to cause pulmonary and extrapulmonary infections. These NTMs are often misdiagnosed as MTB due to their similar clinical presentations to tuberculosis, leading to inappropriate treatment and increased morbidity and mortality rates. This literature review aims to provide an overview of the prevalence, clinical manifestations, diagnosis, and management of NTM infections in Africa. Methods A systematic search was performed using various electronic databases including PubMed, Scopus, and Web of Science. The search was limited to studies published in the English language from 2000 to 2021. The following keywords were used: "non-tuberculous mycobacteria", "NTM", "Africa", and "prevalence". Studies that focused solely on the Mycobacterium tuberculosis complex or those that did not report prevalence rates were excluded. Data extraction was performed on eligible studies. Overall, a total of 32 studies met the inclusion criteria and were included in this review. Results In our literature review, we identified a total of 32 studies that reported non-tuberculosis mycobacteria (NTM) in Africa. The majority of these studies were conducted in South Africa, followed by Ethiopia and Nigeria. The most commonly isolated NTM species were Mycobacterium avium complex (MAC), Mycobacterium fortuitum, and Mycobacterium abscessus. Many of the studies reported a high prevalence of NTM infections among HIV-positive individuals. Other risk factors for NTM infection included advanced age, chronic lung disease, and previous tuberculosis infection. Conclusion In conclusion, this literature review highlights the significant burden of non-tuberculosis mycobacteria infections in Africa. The prevalence of these infections is high, and they are often misdiagnosed due to their similarity to tuberculosis. The lack of awareness and diagnostic tools for non-tuberculosis mycobacteria infections in Africa is a major concern that needs to be addressed urgently. It is crucial to improve laboratory capacity and develop appropriate diagnostic algorithms for these infections.
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Affiliation(s)
- O T Ojo
- Department of Medicine, Lagos State University Teaching Hospital, Ikeja, Lagos, Nigeria
- Department of Medicine, College of Medicine, Lagos State University, Lagos, Nigeria
| | - A O Odeyemi
- Department of Medicine, College of Health Sciences, Osun state University, Osogbo, Nigeria
- Department of Internal Medicine, UNIOSUN Teaching Hospital, Osogbo, Nigeria
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Xiao WL, Wang N, Yang LL, Feng YM, Chu PL, Zhang JJ, Liu SS, Shao WB, Zhou X, Liu LW, Yang S. Exploiting Natural Maltol for Synthesis of Novel Hydroxypyridone Derivatives as Promising Anti-Virulence Agents in Bactericides Discovery. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:6603-6616. [PMID: 37083434 DOI: 10.1021/acs.jafc.3c00465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Anti-infection strategies based on suppression of bacterial virulence factors represent a crucial direction for the development of new antibacterial agents to address the resistance triggered by traditional drugs'/pesticides' bactericidal activity. To identify and obtain more effective and diverse molecules targeting virulence, we prepared a series of 3-hydroxy-2-methyl-1-pyridin-4-(1H)-one derivatives and evaluated their antibacterial behaviors. Compound B6 exhibited the highest bioactivity, with half-maximal effective concentration (EC50) values ranging fro9m 10.03 to 30.16 μg mL-1 against three plant pathogenic bacteria. The antibacterial mechanism showed that it could considerably reduce various virulence factors (such as extracellular enzymes, biofilm, and T3SS effectors) and inhibit the expression of virulence factor-related genes. In addition, the control efficiency of compound B6 against rice bacterial leaf blight at 200 μg mL-1 was 46.15-49.15%, and their control efficiency was improved by approximately 12% after the addition of pesticide additives. Thus, a new class of bactericidal candidates targeting bacterial virulence factors was developed for controlling plant bacterial diseases.
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Affiliation(s)
- Wan-Lin Xiao
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Na Wang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Lin-Li Yang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Yu-Mei Feng
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Pan-Long Chu
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Jiao-Jiao Zhang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Shuai-Shuai Liu
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Wu-Bin Shao
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Xiang Zhou
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Li-Wei Liu
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
| | - Song Yang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China
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Walsh AM, Leech J, Huttenhower C, Delhomme-Nguyen H, Crispie F, Chervaux C, Cotter P. Integrated molecular approaches for fermented food microbiome research. FEMS Microbiol Rev 2023; 47:fuad001. [PMID: 36725208 PMCID: PMC10002906 DOI: 10.1093/femsre/fuad001] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 12/28/2022] [Accepted: 01/09/2023] [Indexed: 02/03/2023] Open
Abstract
Molecular technologies, including high-throughput sequencing, have expanded our perception of the microbial world. Unprecedented insights into the composition and function of microbial communities have generated large interest, with numerous landmark studies published in recent years relating the important roles of microbiomes and the environment-especially diet and nutrition-in human, animal, and global health. As such, food microbiomes represent an important cross-over between the environment and host. This is especially true of fermented food microbiomes, which actively introduce microbial metabolites and, to a lesser extent, live microbes into the human gut. Here, we discuss the history of fermented foods, and examine how molecular approaches have advanced research of these fermented foods over the past decade. We highlight how various molecular approaches have helped us to understand the ways in which microbes shape the qualities of these products, and we summarize the impacts of consuming fermented foods on the gut. Finally, we explore how advances in bioinformatics could be leveraged to enhance our understanding of fermented foods. This review highlights how integrated molecular approaches are changing our understanding of the microbial communities associated with food fermentation, the creation of unique food products, and their influences on the human microbiome and health.
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Affiliation(s)
- Aaron M Walsh
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork and APC Microbiome Ireland, P61 C996, Ireland
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - John Leech
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork and APC Microbiome Ireland, P61 C996, Ireland
| | - Curtis Huttenhower
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | | | - Fiona Crispie
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork and APC Microbiome Ireland, P61 C996, Ireland
| | - Christian Chervaux
- Danone Nutricia Research, Centre Daniel Carasso, Palaiseau 91120, France
| | - Paul D Cotter
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork and APC Microbiome Ireland, P61 C996, Ireland
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Begum JA, Nooruzzaman M, Modak M, Khanam D, Hossain I, Hasnat A, Kabiraj CK, Chowdhury EH. Poultry waste management practices in Bangladesh: Farmer's perceptions, and food and environmental hazards. J Adv Vet Anim Res 2023; 10:72-79. [PMID: 37155533 PMCID: PMC10122936 DOI: 10.5455/javar.2023.j654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 03/06/2023] [Accepted: 03/10/2023] [Indexed: 05/10/2023] Open
Abstract
Objective The poultry industry plays a key role in developing socio-economic and health sectors in Bangladesh. Poultry waste is a potential environmental threat as untreated poultry waste is used in vegetable gardens. The study aimed to investigate the current situation of small-scale poultry farms and their waste management practices in selected areas of Bangladesh and detect Escherichia coli and Salmonella in vegetables from farms using untreated poultry waste as fertilizer. Materials and Methods A structured questionnaire-based survey was conducted in 86 small-scale poultry farms from different upazilas of Mymensingh and Khulna districts. 104 samples, including vegetables, poultry litter, water, and soil, were collected from vegetable gardens, ponds, fields, and wet markets in Mymensingh district to detect microbial contamination. Bacteria were identified based on their growth and colony morphology on selective media and motility tests. The presence of E. coli and Salmonella was confirmed by polymerase chain reaction (PCR) using a commercial PCR kit. Results The survey revealed that mostly middle-aged males were involved in poultry farming. Most of the farmers had primary education and engaged in farming for about 5 years without training. In the study area, 37% of farmers collected droppings daily in the morning and used them as organic fertilizer. About 58% of farmers did not know the hygienic handlings of droppings and faced health problems. In PCR, either E. coli or Salmonella or both were confirmed in vegetables, litter, soil, and pond water. Conclusion Appropriate poultry waste management practices can reduce the possible contamination of microbial agents in the human food chain.
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Affiliation(s)
| | | | - Manasi Modak
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
| | - Dolena Khanam
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
| | - Ismail Hossain
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
| | - Azmary Hasnat
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
| | - Congreiv Kumar Kabiraj
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
| | - Emdadul Haque Chowdhury
- Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
- These two authors contributed equally
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Mycobiome profiling of nasopharyngeal region of SARS-CoV-2 infected individuals. Microbes Infect 2023; 25:105059. [PMID: 36241143 PMCID: PMC9553963 DOI: 10.1016/j.micinf.2022.105059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 09/29/2022] [Accepted: 10/04/2022] [Indexed: 02/07/2023]
Abstract
The present cross-sectional study aims to understand the fungal community composition of the nasopharyngeal region of SARS-CoV-2 infected individuals and how the infection influences the mycobiome therein. The infection significantly (p < 0.05) influenced the alpha diversity. Interestingly, a higher abundance of Cladosporium and Alternaria was noted in the infected individuals and inter-individual variation in mycobiome composition was well supported by beta dispersion analysis (p < 0.05). Moreover, decrease in Aspergillus abundance was observed in infected patients across the four age groups. This study provides insight into the alteration in mycobiome during the viral disease progression and demands continuous investigation to monitor fungal infections.
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Correddu F, Carta S, Mazza A, Nudda A, Rassu SPG. Effect of extruded linseed on sarda donkey milk quality. ITALIAN JOURNAL OF ANIMAL SCIENCE 2022. [DOI: 10.1080/1828051x.2022.2104176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Fabio Correddu
- Dipartimento di Agraria, Sezione di Scienze Zootecniche, University of Sassari, Sassari, Italy
| | - Silvia Carta
- Dipartimento di Agraria, Sezione di Scienze Zootecniche, University of Sassari, Sassari, Italy
| | - Antonio Mazza
- Dipartimento di Agraria, Sezione di Scienze Zootecniche, University of Sassari, Sassari, Italy
| | - Anna Nudda
- Dipartimento di Agraria, Sezione di Scienze Zootecniche, University of Sassari, Sassari, Italy
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Mosley OE, Gios E, Close M, Weaver L, Daughney C, Handley KM. Nitrogen cycling and microbial cooperation in the terrestrial subsurface. THE ISME JOURNAL 2022; 16:2561-2573. [PMID: 35941171 PMCID: PMC9562985 DOI: 10.1038/s41396-022-01300-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 07/19/2022] [Accepted: 07/22/2022] [Indexed: 11/25/2022]
Abstract
The nitrogen cycle plays a major role in aquatic nitrogen transformations, including in the terrestrial subsurface. However, the variety of transformations remains understudied. To determine how nitrogen cycling microorganisms respond to different aquifer chemistries, we sampled groundwater with varying nutrient and oxygen contents. Genes and transcripts involved in major nitrogen-cycling pathways were quantified from 55 and 26 sites, respectively, and metagenomes and metatranscriptomes were analyzed from a subset of oxic and dysoxic sites (0.3-1.1 mg/L bulk dissolved oxygen). Nitrogen-cycling mechanisms (e.g. ammonia oxidation, denitrification, dissimilatory nitrate reduction to ammonium) were prevalent and highly redundant, regardless of site-specific physicochemistry or nitrate availability, and present in 40% of reconstructed genomes, suggesting that nitrogen cycling is a core function of aquifer communities. Transcriptional activity for nitrification, denitrification, nitrite-dependent anaerobic methane oxidation and anaerobic ammonia oxidation (anammox) occurred simultaneously in oxic and dysoxic groundwater, indicating the availability of oxic-anoxic interfaces. Concurrent activity by these microorganisms indicates potential synergisms through metabolite exchange across these interfaces (e.g. nitrite and oxygen). Fragmented denitrification pathway encoding and transcription was widespread among groundwater bacteria, although a considerable proportion of associated transcriptional activity was driven by complete denitrifiers, especially under dysoxic conditions. Despite large differences in transcription, the capacity for the final steps of denitrification was largely invariant to aquifer conditions, and most genes and transcripts encoding N2O reductases were the atypical Sec-dependant type, suggesting energy-efficiency prioritization. Results provide insights into the capacity for cooperative relationships in groundwater communities, and the richness and complexity of metabolic mechanisms leading to the loss of fixed nitrogen.
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Quorum quenching of Streptococcus mutans via the nano-quercetin-based antimicrobial photodynamic therapy as a potential target for cariogenic biofilm. BMC Microbiol 2022; 22:125. [PMID: 35538403 PMCID: PMC9088123 DOI: 10.1186/s12866-022-02544-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 04/28/2022] [Indexed: 12/12/2022] Open
Abstract
Background Quorum sensing (QS) system can regulate the expression of virulence factors and biofilm formation in Streptococcus mutans. Antimicrobial photodynamic therapy (aPDT) inhibits quorum quenching (QQ), and can be used to prevent microbial biofilm. We thereby aimed to evaluate the anti-biofilm potency and anti-metabolic activity of nano-quercetin (N-QCT)-mediated aPDT against S. mutans. Also, in silico evaluation of the inhibitory effect of N-QCT on the competence-stimulating peptide (CSP) of S. mutans was performed to elucidate the impact of aPDT on various QS-regulated genes. Methods Cytotoxicity and intracellular reactive oxygen species (ROS) generation were assessed following synthesis and confirmation of N-QCT. Subsequently, the minimum biofilm inhibitory concentration (MBIC) of N-QCT against S. mutans and anti-biofilm effects of aPDT were assessed using colorimetric assay and plate counting. Molecular modeling and docking analysis were performed to confirm the connection of QCT to CSP. The metabolic activity of S. mutans and the expression level of various genes involved in QS were evaluated by flow cytometry and reverse transcription quantitative real-time PCR, respectively. Results Successful synthesis of non-toxic N-QCT was confirmed through several characterization tests. The MBIC value of N-QCT against S. mutans was 128 μg/mL. Similar to the crystal violet staining, the results log10 CFU/mL showed a significant degradation of preformed biofilms in the group treated with aPDT compared to the control group (P < 0.05). Following aPDT, metabolic activity of S. mutans also decreased by 85.7% (1/2 × MBIC of N-QCT) and 77.3% (1/4 × MBIC of N-QCT), as compared to the control values (P < 0.05). In silico analysis showed that the QCT molecule was located in the site formed by polypeptide helices of CSP. The relative expression levels of the virulence genes were significantly decreased in the presence of N-QCT-mediated aPDT (P < 0.05). Conclusions The combination of N-QCT with blue laser as a QQ-strategy leads to maximum ROS generation, disrupts the microbial biofilm of S. mutans, reduces metabolic activity, and downregulates the expression of genes involved in the QS pathway by targeting genes of the QS signaling system of S. mutans.
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Etter D, Ukowitz C, Eicher C, Tasara T, Johler S. Mild NaCl Stress Influences Staphylococcal Enterotoxin C Transcription in a Time-Dependent Manner and Reduces Protein Expression. Front Microbiol 2022; 13:820067. [PMID: 35516428 PMCID: PMC9062481 DOI: 10.3389/fmicb.2022.820067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/29/2022] [Indexed: 12/01/2022] Open
Abstract
Enterotoxins (SEs) produced by Staphylococcus aureus are the cause of serious food intoxications. Staphylococcal enterotoxin C (SEC) is one of the main contributors, as it is often highly expressed. S. aureus possesses a competitive growth advantage over accompanying bacterial flora under stress conditions encountered in foods, such as high NaCl concentrations. However, the influence of NaCl as an external stressor on SEC expression is still unclear. We investigated the influence of 4.5% NaCl on sec mRNA and SEC protein levels. A qRT-PCR assay revealed that NaCl stress leads to time-dependently decreased or elevated sec mRNA levels for most strains. SEC protein levels were generally decreased under NaCl stress. Our findings suggest that NaCl stress lowers overall SEC concentration and time-dependently affects sec mRNA levels.
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Affiliation(s)
- Danai Etter
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.,Laboratory of Food Microbiology, Institute for Food Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Christina Ukowitz
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland
| | - Corinne Eicher
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland
| | - Taurai Tasara
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland
| | - Sophia Johler
- Institute for Food Safety and Hygiene, Vetsuisse Faculty University of Zurich, Zurich, Switzerland
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Scheithauer L, Thiem S, Ünal CM, Dellmann A, Steinert M. Zinc Metalloprotease ProA from Legionella pneumophila Inhibits the Pro-Inflammatory Host Response by Degradation of Bacterial Flagellin. Biomolecules 2022; 12:624. [PMID: 35625552 PMCID: PMC9138289 DOI: 10.3390/biom12050624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/08/2022] [Accepted: 04/09/2022] [Indexed: 01/27/2023] Open
Abstract
The environmental bacterium Legionella pneumophila is an intracellular pathogen of various protozoan hosts and able to cause Legionnaires' disease, a severe pneumonia in humans. By encoding a wide selection of virulence factors, the infectious agent possesses several strategies to manipulate its host cells and evade immune detection. In the present study, we demonstrate that the L. pneumophila zinc metalloprotease ProA functions as a modulator of flagellin-mediated TLR5 stimulation and subsequent activation of the pro-inflammatory NF-κB pathway. We found ProA to be capable of directly degrading immunogenic FlaA monomers but not the polymeric form of bacterial flagella. These results indicate a role of the protease in antagonizing immune stimulation, which was further substantiated in HEK-BlueTM hTLR5 Detection assays. Addition of purified proteins, bacterial suspensions of L. pneumophila mutant strains as well as supernatants of human lung tissue explant infection to this reporter cell line demonstrated that ProA specifically decreases the TLR5 response via FlaA degradation. Conclusively, the zinc metalloprotease ProA serves as a powerful regulator of exogenous flagellin and presumably creates an important advantage for L. pneumophila proliferation in mammalian hosts by promoting immune evasion.
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Affiliation(s)
- Lina Scheithauer
- Institut für Mikrobiologie, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany; (L.S.); (S.T.); (C.M.Ü.)
| | - Stefanie Thiem
- Institut für Mikrobiologie, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany; (L.S.); (S.T.); (C.M.Ü.)
| | - Can M. Ünal
- Institut für Mikrobiologie, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany; (L.S.); (S.T.); (C.M.Ü.)
| | - Ansgar Dellmann
- Institut für Pathologie, Städtisches Klinikum Braunschweig, Celler Straße 38, 38114 Braunschweig, Germany;
| | - Michael Steinert
- Institut für Mikrobiologie, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany; (L.S.); (S.T.); (C.M.Ü.)
- Helmholtz Center for Infection Research, Inhoffenstraße 7, 38124 Braunschweig, Germany
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Prasad SK, Bhat S, Shashank D, C R A, R S, Rachtanapun P, Devegowda D, Santhekadur PK, Sommano SR. Bacteria-Mediated Oncogenesis and the Underlying Molecular Intricacies: What We Know So Far. Front Oncol 2022; 12:836004. [PMID: 35480118 PMCID: PMC9036991 DOI: 10.3389/fonc.2022.836004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/22/2022] [Indexed: 01/10/2023] Open
Abstract
Cancers are known to have multifactorial etiology. Certain bacteria and viruses are proven carcinogens. Lately, there has been in-depth research investigating carcinogenic capabilities of some bacteria. Reports indicate that chronic inflammation and harmful bacterial metabolites to be strong promoters of neoplasticity. Helicobacter pylori-induced gastric adenocarcinoma is the best illustration of the chronic inflammation paradigm of oncogenesis. Chronic inflammation, which produces excessive reactive oxygen species (ROS) is hypothesized to cause cancerous cell proliferation. Other possible bacteria-dependent mechanisms and virulence factors have also been suspected of playing a vital role in the bacteria-induced-cancer(s). Numerous attempts have been made to explore and establish the possible relationship between the two. With the growing concerns on anti-microbial resistance and over-dependence of mankind on antibiotics to treat bacterial infections, it must be deemed critical to understand and identify carcinogenic bacteria, to establish their role in causing cancer.
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Affiliation(s)
- Shashanka K Prasad
- Department of Biotechnology and Bioinformatics, Faculty of Life Sciences, Jagadguru Sri Shivarathreeshwara (JSS) Academy of Higher Education and Research (JSSAHER), Mysuru, India
| | - Smitha Bhat
- Department of Biotechnology and Bioinformatics, Faculty of Life Sciences, Jagadguru Sri Shivarathreeshwara (JSS) Academy of Higher Education and Research (JSSAHER), Mysuru, India
| | - Dharini Shashank
- Department of General Surgery, Adichunchanagiri Institute of Medical Sciences, Mandya, India
| | - Akshatha C R
- Department of Medical Oncology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Sindhu R
- Department of Microbiology, Faculty of Life Sciences, Jagadguru Sri Shivarathreeshwara (JSS) Academy of Higher Education and Research (JSSAHER), Mysuru, India
| | - Pornchai Rachtanapun
- School of Agro-Industry, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
- Cluster of Agro Bio-Circular-Green Industry (Agro BCG), Chiang Mai University, Chiang Mai, Thailand
| | - Devananda Devegowda
- Centre of Excellence in Molecular Biology and Regenerative Medicine (CEMR), Department of Biochemistry, JSS Medical College, JSS Academy of Higher Education and Research (JSSAHER), Mysuru, India
| | - Prasanna K Santhekadur
- Centre of Excellence in Molecular Biology and Regenerative Medicine (CEMR), Department of Biochemistry, JSS Medical College, JSS Academy of Higher Education and Research (JSSAHER), Mysuru, India
| | - Sarana Rose Sommano
- Cluster of Agro Bio-Circular-Green Industry (Agro BCG), Chiang Mai University, Chiang Mai, Thailand
- Department of Plant and Soil Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand
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Papadakis G, Pantazis AK, Fikas N, Chatziioannidou S, Tsiakalou V, Michaelidou K, Pogka V, Megariti M, Vardaki M, Giarentis K, Heaney J, Nastouli E, Karamitros T, Mentis A, Zafiropoulos A, Sourvinos G, Agelaki S, Gizeli E. Portable real-time colorimetric LAMP-device for rapid quantitative detection of nucleic acids in crude samples. Sci Rep 2022; 12:3775. [PMID: 35260588 PMCID: PMC8904468 DOI: 10.1038/s41598-022-06632-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 01/27/2022] [Indexed: 02/08/2023] Open
Abstract
Loop-mediated isothermal amplification is known for its high sensitivity, specificity and tolerance to inhibiting-substances. In this work, we developed a device for performing real-time colorimetric LAMP combining the accuracy of lab-based quantitative analysis with the simplicity of point-of-care testing. The device innovation lies on the use of a plastic tube anchored vertically on a hot surface while the side walls are exposed to a mini camera able to take snapshots of the colour change in real time during LAMP amplification. Competitive features are the rapid analysis (< 30 min), quantification over 9 log-units, crude sample-compatibility (saliva, tissue, swabs), low detection limit (< 5 copies/reaction), smartphone-operation, fast prototyping (3D-printing) and ability to select the dye of interest (Phenol red, HNB). The device’s clinical utility is demonstrated in cancer mutations-analysis during the detection of 0.01% of BRAF-V600E-to-wild-type molecules from tissue samples and COVID-19 testing with 97% (Ct < 36.8) and 98% (Ct < 30) sensitivity when using extracted RNA and nasopharyngeal-swabs, respectively. The device high technology-readiness-level makes it a suitable platform for performing any colorimetric LAMP assay; moreover, its simple and inexpensive fabrication holds promise for fast deployment and application in global diagnostics.
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Affiliation(s)
- G Papadakis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece. .,BIOPIX DNA TECHNOLOGY PC, Science and Technology Park of Crete, 100 N. Plastira Str., 70013, Heraklion, Greece.
| | - A K Pantazis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece.,BIOPIX DNA TECHNOLOGY PC, Science and Technology Park of Crete, 100 N. Plastira Str., 70013, Heraklion, Greece
| | - N Fikas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece.,BIOPIX DNA TECHNOLOGY PC, Science and Technology Park of Crete, 100 N. Plastira Str., 70013, Heraklion, Greece
| | - S Chatziioannidou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece.,BIOPIX DNA TECHNOLOGY PC, Science and Technology Park of Crete, 100 N. Plastira Str., 70013, Heraklion, Greece.,Department of Biology, University of Crete, 70013, Voutes, Heraklion, Greece
| | - V Tsiakalou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece
| | - K Michaelidou
- Laboratory of Translational Oncology, School of Medicine, University of Crete, 71500, Heraklion, Greece
| | - V Pogka
- National SARS-CoV-2 Reference Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave., 11521, Athens, Greece
| | - M Megariti
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece
| | - M Vardaki
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece.,Department of Biology, University of Crete, 70013, Voutes, Heraklion, Greece
| | - K Giarentis
- Department of Biology, University of Crete, 70013, Voutes, Heraklion, Greece
| | - J Heaney
- Advanced Pathogens Diagnostics Unit, University College London Hospitals NHS Trust, London, WC1H 9AX, UK.,UCL Great Ormond Street Institute of Child Health, London, UK
| | - E Nastouli
- Advanced Pathogens Diagnostics Unit, University College London Hospitals NHS Trust, London, WC1H 9AX, UK.,UCL Great Ormond Street Institute of Child Health, London, UK
| | - T Karamitros
- National SARS-CoV-2 Reference Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave., 11521, Athens, Greece
| | - A Mentis
- National SARS-CoV-2 Reference Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave., 11521, Athens, Greece
| | - A Zafiropoulos
- Laboratory of Clinical Virology, School of Medicine, University of Crete, 71500, Heraklion, Greece
| | - G Sourvinos
- Laboratory of Clinical Virology, School of Medicine, University of Crete, 71500, Heraklion, Greece
| | - S Agelaki
- Department of Biology, University of Crete, 70013, Voutes, Heraklion, Greece.,Department of Medical Oncology, University General Hospital, 71110, Heraklion, Greece
| | - E Gizeli
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 100 N. Plastira Str., 70013, Heraklion, Greece. .,Department of Biology, University of Crete, 70013, Voutes, Heraklion, Greece.
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15
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Esmaeilnia M, Saffari M, Rashki S, Marzhoseyni Z, Khaledi A, Moosavi GA, Atoof F, Alani B. Molecular typing of clinical and environmental isolates of Klebsiella pneumoniae producing ESBLs by PFGE. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2022; 25:208-213. [PMID: 35655602 PMCID: PMC9124538 DOI: 10.22038/ijbms.2022.58445.12981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 01/11/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Klebsiella pneumoniae is the common cause of pneumonia in hospitalized patients, particularly in intensive care units (ICU). The infection can transfer by medical equipment such as mechanical ventilators. This study aimed to investigate the molecular typing of the extended-spectrum beta-lactamase-producing K. pneumoniae isolates recovered from Beheshti Hospital, Kashan, Iran. MATERIALS AND METHODS K. pneumoniae isolates producing ESBLs have been collected from the samples obtained from Shahid Beheshti hospital, Kashan, Iran. Antimicrobial susceptibility was determined using the Kirby Bauer disk diffusion method. The presence of ESBLs was evaluated using CLSI for ESBL screening by the double-disk diffusion method. Molecular typing was conducted by pulsed-field gel electrophoresis (PFGE). In total, 89 K. pneumoniae isolates were recovered, of which 47.1% were ESBL producers. RESULTS Results showed that all of the clinical and environmental isolates were resistant to ceftriaxone, meropenem, cefazolin, cefotaxime, cephalothin, and piperacillin-tazobactam. All isolates were grouped under four clusters (A-D). The major cluster was related to the C cluster with 22 isolates (19 clinical and 3 environmental). Seventy-two percent of isolates were from the ICU ward. There was no correlation between antibiotic resistance patterns and PFGE clusters (P=0.2). CONCLUSION We observed a common molecular signature among both clinical and environmental K. pneumoniae isolates, indicating a similar genotype and likely a common origin for ESBL producer isolates found in different hospital wards. Therefore, hospitals need to implement an effective infection control system to decrease the spreading of ESBL strains within the hospitals and subsequently the transmission of the infection to patients.
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Affiliation(s)
- Mohammad Esmaeilnia
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran, Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran
| | - Mahmood Saffari
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran, Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran
| | - Somaye Rashki
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran, Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran
| | - Zeynab Marzhoseyni
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran, Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran
| | - Azad Khaledi
- Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Science, Kashan, Iran, Infectious Diseases Research Center, Kashan University of Medical Science, Kashan, Iran,Corresponding author: Azad Khaledi. Department of Microbiology and Immunology, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran. Tel: +98-31-55443022;
| | - Gholam Abbas Moosavi
- Department of Vital Statistics and Epidemiology, School of Health, Kashan University of Medical Sciences, Kashan, Iran
| | - Fatemeh Atoof
- Department of Biostatistics, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran
| | - Behrang Alani
- Department of Applied Cell Sciences, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
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16
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Mraz AL, Weir MH. Knowledge to Predict Pathogens: Legionella pneumophila Lifecycle Systematic Review Part II Growth within and Egress from a Host Cell. Microorganisms 2022; 10:141. [PMID: 35056590 PMCID: PMC8780890 DOI: 10.3390/microorganisms10010141] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 12/30/2021] [Accepted: 01/04/2022] [Indexed: 11/17/2022] Open
Abstract
Legionella pneumophila (L. pneumophila) is a pathogenic bacterium of increasing concern, due to its ability to cause a severe pneumonia, Legionnaires' Disease (LD), and the challenges in controlling the bacteria within premise plumbing systems. L. pneumophila can thrive within the biofilm of premise plumbing systems, utilizing protozoan hosts for protection from environmental stressors and to increase its growth rate, which increases the bacteria's infectivity to human host cells. Typical disinfectant techniques have proven to be inadequate in controlling L. pneumophila in the premise plumbing system, exposing users to LD risks. As the bacteria have limited infectivity to human macrophages without replicating within a host protozoan cell, the replication within, and egress from, a protozoan host cell is an integral part of the bacteria's lifecycle. While there is a great deal of information regarding how L. pneumophila interacts with protozoa, the ability to use this data in a model to attempt to predict a concentration of L. pneumophila in a water system is not known. This systematic review summarizes the information in the literature regarding L. pneumophila's growth within and egress from the host cell, summarizes the genes which affect these processes, and calculates how oxidative stress can downregulate those genes.
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Affiliation(s)
- Alexis L. Mraz
- School of Nursing, Health, Exercise Science, The College of New Jersey, P.O. Box 7718, 2000 Pennington Rd., Ewing, NJ 08628, USA
| | - Mark H. Weir
- Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, OH 43210, USA;
- Sustainability Institute, The Ohio State University, Columbus, OH 43210, USA
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17
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Poojari K, Akhila DS, Mohan Raj JR, Santhosh KS, Kenjar A, Ashwath P. Biocontrol of Escherichia coli and Salmonella in poultry meat using phage cocktail. IRANIAN JOURNAL OF VETERINARY RESEARCH 2022; 23:270-274. [PMID: 36425599 PMCID: PMC9681973 DOI: 10.22099/ijvr.2022.41490.6030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 02/20/2022] [Accepted: 02/26/2022] [Indexed: 02/18/2023]
Abstract
BACKGROUND Despite advances in food management techniques, foodborne illness remains a major concern. Contamination of Salmonell a and Escherichia coli pathogens, especially in the poultry sector, is responsible for salmonellosis and other gastrointestinal illness, leading to millions of deaths worldwide. Overuse of antibiotics and other chemical treatments have further increased the emergence of antibiotic resistant bacteria. AIMS This study aimed to study the efficacy of phages cocktail to reduce the load of E. coli and Samlonella spiked on poultry meat. METHODS In this study, a broad spectrum cocktail of phages was used to lyse E. coli and Salmonella spiked on chicken meat. RESULTS Based on the result of the CFU drop assay, phages like E. coli 153T 3ii and Salmonella 191(3) were selected. Phage concentration of 0.01 MOI showed a reduction in E. coli and Salmonella count to 6 h and 2 h, respectively. Further, phages were tested on the surface of chicken meat. E. coli showed a 90% reduction up to 4 h, whereas Salmonella showed a 90% reduction up to 6 h. When phages were treated in combination, a significant reduction of up to 12 h was found with Salmonella phage, showing better antimicrobial activity. CONCLUSION The suitable concentration of a specific phage or phage cocktail can significantly reduce the bacterial count on chicken meat. Phage mediated biocontrol can be used as an alternative approach to eliminate enteric pathogens in the poultry industry.
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Affiliation(s)
- K. Poojari
- Nitte (Deemed to be University), Nitte University Centre for Science Education and Research, Deralakatte, Mangaluru, Karnataka 575018, India;
| | - D. S. Akhila
- Nitte (Deemed to be University), Nitte University Centre for Science Education and Research, Deralakatte, Mangaluru, Karnataka 575018, India; ,Correspondence: D. S. Akhila, Nitte (Deemed to be University), Nitte University Centre for Science Education and Research, Deralakatte, Mangaluru, Karnataka 575018, India. E-mail:
| | - J. R. Mohan Raj
- Nitte (Deemed to be University), Nitte University Centre for Science Education and Research, Deralakatte, Mangaluru, Karnataka 575018, India;
| | - K. S. Santhosh
- Virus Research and Diagnostic Laboratory (VRDL), Shimoga Institute of Medical Sciences (SIMS), Shivamogga-577 201, India
| | - A. Kenjar
- Virus Research and Diagnostic Laboratory (VRDL), Shimoga Institute of Medical Sciences (SIMS), Shivamogga-577 201, India
| | - P. Ashwath
- Nitte (Deemed to be University), Nitte University Centre for Science Education and Research, Deralakatte, Mangaluru, Karnataka 575018, India;
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18
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Mahto KU, Kumari S, Das S. Unraveling the complex regulatory networks in biofilm formation in bacteria and relevance of biofilms in environmental remediation. Crit Rev Biochem Mol Biol 2021; 57:305-332. [PMID: 34937434 DOI: 10.1080/10409238.2021.2015747] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biofilms are assemblages of bacteria embedded within a matrix of extracellular polymeric substances (EPS) attached to a substratum. The process of biofilm formation is a complex phenomenon regulated by the intracellular and intercellular signaling systems. Various secondary messenger molecules such as cyclic dimeric guanosine 3',5'-monophosphate (c-di-GMP), cyclic adenosine 3',5'-monophosphate (cAMP), and cyclic dimeric adenosine 3',5'-monophosphate (c-di-AMP) are involved in complex signaling networks to regulate biofilm development in several bacteria. Moreover, the cell to cell communication system known as Quorum Sensing (QS) also regulates biofilm formation via diverse mechanisms in various bacterial species. Bacteria often switch to the biofilm lifestyle in the presence of toxic pollutants to improve their survivability. Bacteria within a biofilm possess several advantages with regard to the degradation of harmful pollutants, such as increased protection within the biofilm to resist the toxic pollutants, synthesis of extracellular polymeric substances (EPS) that helps in the sequestration of pollutants, elevated catabolic gene expression within the biofilm microenvironment, higher cell density possessing a large pool of genetic resources, adhesion ability to a wide range of substrata, and metabolic heterogeneity. Therefore, a comprehensive account of the various factors regulating biofilm development would provide valuable insights to modulate biofilm formation for improved bioremediation practices. This review summarizes the complex regulatory networks that influence biofilm development in bacteria, with a major focus on the applications of bacterial biofilms for environmental restoration.
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Affiliation(s)
- Kumari Uma Mahto
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
| | - Swetambari Kumari
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
| | - Surajit Das
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
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19
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Nearing JT, Comeau AM, Langille MGI. Identifying biases and their potential solutions in human microbiome studies. MICROBIOME 2021; 9:113. [PMID: 34006335 PMCID: PMC8132403 DOI: 10.1186/s40168-021-01059-0] [Citation(s) in RCA: 69] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 03/24/2021] [Indexed: 05/13/2023]
Abstract
Advances in DNA sequencing technology have vastly improved the ability of researchers to explore the microbial inhabitants of the human body. Unfortunately, while these studies have uncovered the importance of these microbial communities to our health, they often do not result in similar findings. One possible reason for the disagreement in these results is due to the multitude of systemic biases that are introduced during sequence-based microbiome studies. These biases begin with sample collection and continue to be introduced throughout the entire experiment leading to an observed community that is significantly altered from the true underlying microbial composition. In this review, we will highlight the various steps in typical sequence-based human microbiome studies where significant bias can be introduced, and we will review the current efforts within the field that aim to reduce the impact of these biases. Video abstract.
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Affiliation(s)
- Jacob T Nearing
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - André M Comeau
- Integrated Microbiome Resource, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Morgan G I Langille
- Integrated Microbiome Resource, Dalhousie University, Halifax, Nova Scotia, Canada.
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.
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20
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Qiu M, Shen W, Yan X, He Q, Cai D, Chen S, Wei H, Knoshaug EP, Zhang M, Himmel ME, Yang S. Metabolic engineering of Zymomonas mobilis for anaerobic isobutanol production. BIOTECHNOLOGY FOR BIOFUELS 2020; 13:15. [PMID: 31998408 PMCID: PMC6982386 DOI: 10.1186/s13068-020-1654-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 01/11/2020] [Indexed: 05/19/2023]
Abstract
BACKGROUND Biofuels and value-added biochemicals derived from renewable biomass via biochemical conversion have attracted considerable attention to meet global sustainable energy and environmental goals. Isobutanol is a four-carbon alcohol with many advantages that make it attractive as a fossil-fuel alternative. Zymomonas mobilis is a highly efficient, anaerobic, ethanologenic bacterium making it a promising industrial platform for use in a biorefinery. RESULTS In this study, the effect of isobutanol on Z. mobilis was investigated, and various isobutanol-producing recombinant strains were constructed. The results showed that the Z. mobilis parental strain was able to grow in the presence of isobutanol below 12 g/L while concentrations greater than 16 g/L inhibited cell growth. Integration of the heterologous gene encoding 2-ketoisovalerate decarboxylase such as kdcA from Lactococcus lactis is required for isobutanol production in Z. mobilis. Moreover, isobutanol production increased from nearly zero to 100-150 mg/L in recombinant strains containing the kdcA gene driven by the tetracycline-inducible promoter Ptet. In addition, we determined that overexpression of a heterologous als gene and two native genes (ilvC and ilvD) involved in valine metabolism in a recombinant Z. mobilis strain expressing kdcA can divert pyruvate from ethanol production to isobutanol biosynthesis. This engineering improved isobutanol production to above 1 g/L. Finally, recombinant strains containing both a synthetic operon, als-ilvC-ilvD, driven by Ptet and the kdcA gene driven by the constitutive strong promoter, Pgap, were determined to greatly enhance isobutanol production with a maximum titer about 4.0 g/L. Finally, isobutanol production was negatively affected by aeration with more isobutanol being produced in more poorly aerated flasks. CONCLUSIONS This study demonstrated that overexpression of kdcA in combination with a synthetic heterologous operon, als-ilvC-ilvD, is crucial for diverting pyruvate from ethanol production for enhanced isobutanol biosynthesis. Moreover, this study also provides a strategy for harnessing the valine metabolic pathway for future production of other pyruvate-derived biochemicals in Z. mobilis.
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Affiliation(s)
- Mengyue Qiu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Wei Shen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Xiongyin Yan
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Qiaoning He
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Dongbo Cai
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Shouwen Chen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Hui Wei
- Biosciences Centers, National Renewable Energy Laboratory, Golden, CO 80401 USA
| | - Eric P. Knoshaug
- National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO 80401 USA
| | - Min Zhang
- Biosciences Centers, National Renewable Energy Laboratory, Golden, CO 80401 USA
| | - Michael E. Himmel
- Biosciences Centers, National Renewable Energy Laboratory, Golden, CO 80401 USA
| | - Shihui Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province, and School of Life Sciences, Hubei University, Wuhan, 430062 China
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21
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Salem SE, Maddox TW, Antczak P, Ketley JM, Williams NJ, Archer DC. Acute changes in the colonic microbiota are associated with large intestinal forms of surgical colic. BMC Vet Res 2019; 15:468. [PMID: 31864369 PMCID: PMC6925886 DOI: 10.1186/s12917-019-2205-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 12/03/2019] [Indexed: 02/06/2023] Open
Abstract
Background Horses that undergo surgery for treatment of primary large colon disease have been reported to be at increased risk of developing recurrent colic episodes postoperatively. The reasons for this are currently unknown. The aim of the current study was to characterise the faecal microbiota of horses with colic signs associated with primary large colon lesions treated surgically and to compare the composition of their faecal microbiota to that of a control group of horses undergoing emergency orthopaedic treatment. Faecal samples were collected from horses in both groups on admission to hospital, during hospitalisation and following discharge from hospital for a total duration of 12 weeks. Additionally, colonic content samples were collected from surgical colic patients if pelvic flexure enterotomy was performed during laparotomy. A total of 12 samples were collected per horse. DNA was extracted from samples using a commercial kit. Amplicon mixtures were created by PCR amplification of the V1 – V2 regions of the bacterial 16S rRNA genes and submitted for sequencing using the Ion Torrent PGM next-generation sequencing system. Multivariate data analysis was used to characterise the faecal microbiota and to investigate differences between groups. Results Reduced species richness was evident in the colonic samples of the colic group compared to concurrent sampling of the faeces. Alpha and beta diversity differed significantly between the faecal and colonic microbiota with 304 significantly differentially abundant OTUs identified. Only 46 OTUs varied significantly between the colic and control group. There were no significant differences in alpha and beta diversity of faecal microbiota between colic and control horses at admission. However, this lack of significant differences between groups should be interpreted with caution due to a small sample size. Conclusions The results of the current study suggest that faecal samples collected at hospital admission in colic cases may not accurately represent changes in upper gut microbiota in horses with colic due to large colon disease.
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Affiliation(s)
- Shebl E Salem
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Wirral, CH64 7TE, UK.,Department of Surgery, Faculty of Veterinary Medicine, Zagazig University, Zagazig, 44519, Egypt
| | - Thomas W Maddox
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, Leahurst Campus, Wirral, CH64 7TE, UK
| | - Philipp Antczak
- Computational Biology Facility, Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Julian M Ketley
- Department of Genetics and Genome Biology, College of Life Sciences, University of Leicester, Leicester, LE1 7RH, UK
| | - Nicola J Williams
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Wirral, CH64 7TE, UK
| | - Debra C Archer
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Wirral, CH64 7TE, UK.
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Shen W, Zhang J, Geng B, Qiu M, Hu M, Yang Q, Bao W, Xiao Y, Zheng Y, Peng W, Zhang G, Ma L, Yang S. Establishment and application of a CRISPR-Cas12a assisted genome-editing system in Zymomonas mobilis. Microb Cell Fact 2019; 18:162. [PMID: 31581942 PMCID: PMC6777028 DOI: 10.1186/s12934-019-1219-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 09/26/2019] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Efficient and convenient genome-editing toolkits can expedite genomic research and strain improvement for desirable phenotypes. Zymomonas mobilis is a highly efficient ethanol-producing bacterium with a small genome size and desirable industrial characteristics, which makes it a promising chassis for biorefinery and synthetic biology studies. While classical techniques for genetic manipulation are available for Z. mobilis, efficient genetic engineering toolkits enabling rapidly systematic and high-throughput genome editing in Z. mobilis are still lacking. RESULTS Using Cas12a (Cpf1) from Francisella novicida, a recombinant strain with inducible cas12a expression for genome editing was constructed in Z. mobilis ZM4, which can be used to mediate RNA-guided DNA cleavage at targeted genomic loci. gRNAs were then designed targeting the replicons of native plasmids of ZM4 with about 100% curing efficiency for three native plasmids. In addition, CRISPR-Cas12a recombineering was used to promote gene deletion and insertion in one step efficiently and precisely with efficiency up to 90%. Combined with single-stranded DNA (ssDNA), CRISPR-Cas12a system was also applied to introduce minor nucleotide modification precisely into the genome with high fidelity. Furthermore, the CRISPR-Cas12a system was employed to introduce a heterologous lactate dehydrogenase into Z. mobilis with a recombinant lactate-producing strain constructed. CONCLUSIONS This study applied CRISPR-Cas12a in Z. mobilis and established a genome editing tool for efficient and convenient genome engineering in Z. mobilis including plasmid curing, gene deletion and insertion, as well as nucleotide substitution, which can also be employed for metabolic engineering to help divert the carbon flux from ethanol production to other products such as lactate demonstrated in this work. The CRISPR-Cas12a system established in this study thus provides a versatile and powerful genome-editing tool in Z. mobilis for functional genomic research, strain improvement, as well as synthetic microbial chassis development for economic biochemical production.
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Affiliation(s)
- Wei Shen
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Jun Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Binan Geng
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Mengyue Qiu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Mimi Hu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Qing Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Weiwei Bao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Yubei Xiao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Yanli Zheng
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Wenfang Peng
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Guimin Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Lixin Ma
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Shihui Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Environmental Microbial Technology Center of Hubei Province and School of Life Sciences, Hubei University, Wuhan, 430062 China
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Moossavi S, Engen PA, Ghanbari R, Green SJ, Naqib A, Bishehsari F, Merat S, Poustchi H, Keshavarzian A, Malekzadeh R. Assessment of the impact of different fecal storage protocols on the microbiota diversity and composition: a pilot study. BMC Microbiol 2019; 19:145. [PMID: 31253096 PMCID: PMC6599303 DOI: 10.1186/s12866-019-1519-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 06/17/2019] [Indexed: 01/05/2023] Open
Abstract
Background Fecal samples are currently the most commonly studied proxy for gut microbiota. The gold standard of sample handling and storage for microbiota analysis is maintaining the cold chain during sample transfer and immediate storage at − 80 °C. Gut microbiota studies in large-scale, population-based cohorts require a feasible sample collection protocol. We compared the effect of three different storage methods and mock shipment: immediate freezing at − 80 °C, in 95% ethanol stored at room temperature (RT) for 48 h, and on blood collection card stored at RT for 48 h, on the measured composition of fecal microbiota of eight healthy, female volunteers by sequencing the V4 region of the 16S rRNA gene on an Illumina MiSeq. Results Shared operational taxonomic units (OTUs) between different methods were 68 and 3% for OTUs > 0.01 and < 0.01% mean relative abundance within each group, respectively. α and β-diversity measures were not significantly impacted by different storage methods. With the exception of Actinobacteria, fecal microbiota profiles at the phylum level were not significantly affected by the storage method. Actinobacteria was significantly higher in samples collected on card compared to immediate freezing (1.6 ± 1.1% vs. 0.4 ± 0.2%, p = 0.005) mainly driven by expansion of Actinobacteria relative abundance in fecal samples stored on card in two individuals. There was no statistically significant difference at lower taxonomic levels tested. Conclusion Consistent results of the microbiota composition and structure for different storage methods were observed. Fecal collection on card could be a suitable alternative to immediate freezing for fecal microbiota analysis using 16S rRNA gene amplicon sequencing. Electronic supplementary material The online version of this article (10.1186/s12866-019-1519-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Shirin Moossavi
- Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran.,Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada
| | - Phillip A Engen
- Department of Internal Medicine, Division of Gastroenterology, Rush University Medical Center, Chicago, IL, USA
| | - Reza Ghanbari
- Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran.,Department of Nutrition, Nutrition Research Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Stefan J Green
- Sequencing Core, Research Resources Center, University of Illinois at Chicago, Chicago, IL, USA.,Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL, USA
| | - Ankur Naqib
- Sequencing Core, Research Resources Center, University of Illinois at Chicago, Chicago, IL, USA
| | - Faraz Bishehsari
- Department of Internal Medicine, Division of Gastroenterology, Rush University Medical Center, Chicago, IL, USA
| | - Shahin Merat
- Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran.,Liver and Pancreatobiliary Diseases Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Shariati Hospital, Kargar Shomali Avenue, Tehran, Iran
| | - Hossein Poustchi
- Liver and Pancreatobiliary Diseases Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Shariati Hospital, Kargar Shomali Avenue, Tehran, Iran
| | - Ali Keshavarzian
- Department of Internal Medicine, Division of Gastroenterology, Rush University Medical Center, Chicago, IL, USA.,Department of Pharmacology, Rush University Medical Center, Chicago, IL, USA.,Department of Physiology, Rush University Medical Center, Chicago, IL, USA.,Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, Netherlands
| | - Reza Malekzadeh
- Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran. .,Liver and Pancreatobiliary Diseases Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Shariati Hospital, Kargar Shomali Avenue, Tehran, Iran.
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Microbial Electrosynthesis I: Pure and Defined Mixed Culture Engineering. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2019; 167:181-202. [PMID: 29071400 DOI: 10.1007/10_2017_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In the past 6 years, microbial bioelectrochemistry has strongly increased in attraction and audience when expanding from mainly environmental technology applications to biotechnology. In particular, the promise to combine electrosynthesis with microbial catalysis opens attractive approaches for new sustainable redox-cofactor recycling, redox-balancing, or even biosynthesis processes. Much of this promise is still not fulfilled, but it has opened and fueled entirely new research areas in this discipline. Activities in designing, tailoring, and applying specific microbial catalysts as pure or defined co-cultures for defined target bioproductions are greatly accelerating. This chapter gives an overview of the current progress as well as the emerging trends in molecular and ecological engineering of defined microbial biocatalysts to prepare them for evolving microbial electrosynthesis processes. In addition, the multitude of microbial electrosynthetic processes with complex undefined mixed cultures is covered by ter Heijne et al. (Adv Biochem Eng Biotechnol. https://doi.org/10.1007/10_2017_15 , 2017). Graphical Abstract.
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Le VT, Leelakriangsak M, Lee SW, Panphon S, Utispan K, Koontongkaew S. Characterization and safety evaluation of partially purified bacteriocin produced by Escherichia coli E isolated from fermented pineapple Ananas comosus (L.) Merr. Braz J Microbiol 2019; 50:33-42. [PMID: 30637641 PMCID: PMC6863319 DOI: 10.1007/s42770-018-0014-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 07/30/2018] [Indexed: 11/30/2022] Open
Abstract
Antibacterial activity of cell-free supernatant from Escherichia coli E against selected pathogenic bacteria in food and aquaculture was the highest against Edwardsiella tarda 3, a significant aquaculture pathogen. Biochemical properties of the bacteriocins were studied and bacteriocin was found to be sensitive to proteinase K, demonstrating its proteinaceous nature. In addition, pH and temperature affected bacteriocin activity and stability. The bacteriocins were partially purified by ammonium sulfate precipitation. The antibacterial activity was only detected in 20% ammonium sulfate fraction and direct detection of its activity was performed by overlaying on the indicator strains. The inhibition zone associated with the antibacterial activity was detected in the sample overlaid by E. tarda 3 and Staphylococcus aureus DMST8840 with the relative molecular mass of about 27 kDa and 10 kDa, respectively. Bacteriocin showed no cytotoxic effect on NIH-3T3 cell line; however, two virulence genes, aer and sfa, were detected in the genome of E. coli E by PCR. The characteristics of bacteriocins produced by E. coli E exhibited the antibacterial activity against both Gram-positive and Gram-negative pathogenic bacteria and the safe use determined by cytotoxicity test which may have interesting biotechnological applications.
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Affiliation(s)
- Van Thi Le
- Biology Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
| | - Montira Leelakriangsak
- Biology Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand.
| | - Seong Wei Lee
- Faculty of Agro Based Industry, Universiti Malaysia Kelantan Campus Jeli, Jeli, Kelantan, 17600, Malaysia
| | - Somrak Panphon
- Biology Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand
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Li M, Hu HW, Chen Z, Zhang YX, Li H. Using drug-loaded pH-responsive poly(4-vinylpyridine) microspheres as a new strategy for intelligent controlling of Lactobacillus plantarum contamination in bioethanol fermentation. World J Microbiol Biotechnol 2018; 34:146. [PMID: 30206729 DOI: 10.1007/s11274-018-2533-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 09/09/2018] [Indexed: 12/18/2022]
Abstract
Bioethanol fermentation is usually contaminated by bacteria, especially lactic acid bacteria (LAB), thereby leading to decrease of bioethanol yield and serious economic losses. Nisin is safer for controlling of bacterial contamination than antibiotics that are widely applied in industry. Moreover, in LAB contaminative bioethanol fermentation system, consistently decreased pH value provides opportunity to realize pH value responsive material-based release of anti-bacteria substances for intelligent and persistent controlling of bacterial contamination. In this study, nisin was embedded into pH-sensitive poly(4-vinylpyridine) (P4VP) microspheres synthesized by suspension polymerization to realize intelligent controlling of Lactobacillus plantarum contamination in bioethanol fermentation. Chloramphenicol with the highest antimicrobial activity and excellent stability was chosen as the model drug to be embedded into P4VP microspheres to test the drug release behavior. The drug release curve of chloramphenicol-loaded P4VP microspheres showed sustained and pH-responsive release properties. The diameters of the microspheres ranged from 40 to 100 µm. The encapsulation efficiency of nisin into P4VP microspheres was 47.67% and the drug-loading capacity of nisin was 2.5%. Nisin-loaded P4VP microspheres were added into the simulated contaminative fermentation system, and successfully reversed the decline of bioethanol yield secondary to L. plantarum contamination. The results in this study indicated that L. plantarum contamination in bioethanol fermentation could be effectively controlled by nisin-loaded P4VP microspheres.
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Affiliation(s)
- Ming Li
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hong-Wei Hu
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ze Chen
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ya-Xian Zhang
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Hao Li
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
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Synthesis of the quorum sensing molecule Diffusible Signal Factor using the alkyne zipper reaction. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.04.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Different susceptibility to porcine reproductive and respiratory syndrome virus infection among Chinese native pig breeds. Arch Virol 2018; 163:2155-2164. [DOI: 10.1007/s00705-018-3821-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 03/14/2018] [Indexed: 10/17/2022]
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Hu X, Lu Y, Li M, Yu J, Lu S. Effect of Montmorillonite on the Crystallization, Rheological and Physical Behavior of Polyamide-6/Polylactic Acid Blends. POLYMER SCIENCE SERIES A 2018. [DOI: 10.1134/s0965545x18020062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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周 思, 董 兰, 何 元, 肖 虹. [Characterization of chromate resistance in genetically engineered Escherichia coli expressing chromate ion transporter ChrA]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2017; 37:1290-1295. [PMID: 29070456 PMCID: PMC6743972 DOI: 10.3969/j.issn.1673-4254.2017.10.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To construct a genetically engineered Escherichia coli expressing chromate (Cr) ion transporter ChrA and test its Cr resistance capacity. METHODS ChrA gene was cloned by PCR from the DNA template of Serratia sp. S2 and linked with the prokaryotic vector pET-28a (+). The recombinant vector was transformed into E.coli BL21 (DE3) cells for expression of ChrA protein. Cr (VI) risistance and Cr (VI) uptake and efflux of the engineered bacteria were tested, and the effects of Cr loading time, oxyanions (ulfate, molybdate, vanadate, tungstate), and respiratory inhibitors (valinomycin, CN-, oligomycin, and NADH) on Cr (VI) efflux were examined to analyze the pathway of Cr (VI) transport by ChrA protein. RESULTS The engineered E. coil strain was successfully constructed. Experiments using cell suspensions showed a lowered Cr2O72- uptake but an increased efflux capacity of ChrA-engineered bacteria compared with the control strain (P<0.05). The engineered E. coil cells in exponential growth incubated for 30 min in the presence of 50 mg/L Cr2O72- showed a total displacement of Cr (VI) of 20% after resuspension in PBS at 10 min, but chromate efflux decreased subsequently as the incubation time extended. Oxyanions sulfate and molybdate significantly inhibited chromate efflux in the engineered bacteria (P<0.05), whereas tungstate and vanadate did not obviously affect chromate efflux; chromate efflux was significantly inhibited by K+ ionophore valinomycin and CN-, enhanced by NADH (P<0.05), but not affected by oligomycin, suggesting the role of chromate transporter ChrA as a chemiosmotic pump that extrudes chromate using the proton-motive force. CONCLUSION ChrA can efficiently transport chromate ions from the cytoplasm to enhance chromate resistance of the genetically engineered E. coli.
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Affiliation(s)
- 思敏 周
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 兰岚 董
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 元 何
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
| | - 虹 肖
- />重庆医科大学公共卫生与管理学院//医学与社会发展研究中心//健康领域社会风险预测治理协同创新中心, 重庆 400016Research Center for Medicine and Social Development, Innovation Center for Social Risk Governance in Health, School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China
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Parallel Evolution of Two Clades of an Atlantic-Endemic Pathogenic Lineage of Vibrio parahaemolyticus by Independent Acquisition of Related Pathogenicity Islands. Appl Environ Microbiol 2017; 83:AEM.01168-17. [PMID: 28687650 DOI: 10.1128/aem.01168-17] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 06/30/2017] [Indexed: 11/20/2022] Open
Abstract
Shellfish-transmitted Vibrio parahaemolyticus infections have recently increased from locations with historically low disease incidence, such as the Northeast United States. This change coincided with a bacterial population shift toward human-pathogenic variants occurring in part through the introduction of several Pacific native lineages (ST36, ST43, and ST636) to nearshore areas off the Atlantic coast of the Northeast United States. Concomitantly, ST631 emerged as a major endemic pathogen. Phylogenetic trees of clinical and environmental isolates indicated that two clades diverged from a common ST631 ancestor, and in each of these clades, a human-pathogenic variant evolved independently through acquisition of distinct Vibrio pathogenicity islands (VPaI). These VPaI differ from each other and bear little resemblance to hemolysin-containing VPaI from isolates of the pandemic clonal complex. Clade I ST631 isolates either harbored no hemolysins or contained a chromosome I-inserted island we call VPaIβ that encodes a type 3 secretion system (T3SS2β) typical of Trh hemolysin producers. The more clinically prevalent and clonal ST631 clade II had an island we call VPaIγ that encodes both tdh and trh and that was inserted in chromosome II. VPaIγ was derived from VPaIβ but with some additional acquired elements in common with VPaI carried by pandemic isolates, exemplifying the mosaic nature of pathogenicity islands. Genomics comparisons and amplicon assays identified VPaIγ-type islands containing tdh inserted adjacent to the ure cluster in the three introduced Pacific and most other emergent lineages that collectively cause 67% of infections in the Northeast United States as of 2016.IMPORTANCE The availability of three different hemolysin genotypes in the ST631 lineage provided a unique opportunity to employ genome comparisons to further our understanding of the processes underlying pathogen evolution. The fact that two different pathogenic clades arose in parallel from the same potentially benign lineage by independent VPaI acquisition is surprising considering the historically low prevalence of community members harboring VPaI in waters along the Northeast U.S. coast that could serve as the source of this material. This illustrates a possible predisposition of some lineages to not only acquire foreign DNA but also become human pathogens. Whereas the underlying cause for the expansion of V. parahaemolyticus lineages harboring VPaIγ along the U.S. Atlantic coast and spread of this element to multiple lineages that underlies disease emergence is not known, this work underscores the need to define the environment factors that favor bacteria harboring VPaI in locations of emergent disease.
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A gyrB oligonucleotide microarray for the specific detection of pathogenic Legionella and three Legionella pneumophila subsp. Antonie van Leeuwenhoek 2017; 110:1515-1525. [PMID: 28695408 DOI: 10.1007/s10482-017-0903-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/26/2017] [Indexed: 10/19/2022]
Abstract
Among the 50 species and 70 serogroups of Legionella identified, Legionella pneumophila, comprising three subsp. (subsp. pneumophila, subsp. fraseri, and subsp. pasculleii), is recognized as the major cause of epidemic legionellosis. Rapid and reliable assays to identify pathogenic Legionella spp., and the three L. pneumophila subsp. in particular, are in great demand. In this study, we analyzed the gyrB genes of eleven Legionella spp. and subsp., comprising L. anisa, L. bozemanii, L. dumoffii, L. feeleii, L. gormanii, L. longbeachae, L. micdadei, L. waltersii, L. pneumophila subsp. pneumophila, L. pneumophila subsp. fraseri, and L. pneumophila subsp. pasculleii. We developed a rapid oligonucleotide microarray detection technique to identify accurately these common pathogenic Legionella spp. and L. pneumophila subsp. To detect multiple Legionella species with high specificity, 31 reproducible probes were designed in the array. Sixty-one strains were analyzed in total, including 37 target pathogens and 24 non-target bacterial species used to validate the microarray. The sensitivity of the detection was 1.0 ng using genomic DNA of three Legionella spp., L. anisa, L. dumoffii, and L. waltersii, or 13 CFU/100 mL using the cultured L. pneumophila subsp. pneumophila. Eight isolated strains were tested using the microarray with 100% accuracy. The data indicated that the technique is an efficient method to diagnose and detect Legionella spp. and subsp. in basic microbiology, clinical diagnosis, epidemiological surveillance, and food safety applications. In addition, a phylogenetic study based on the gyrB gene revealed the genetic relationship among the different Legionella spp. and subsp.
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Shao X, Levin B, Nemenman I. Single variant bottleneck in the early dynamics ofH. influenzaebacteremia in neonatal rats questions the theory of independent action. Phys Biol 2017; 14:045004. [DOI: 10.1088/1478-3975/aa731b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Aguilera Rossi CG, Gómez-Puertas P, Ayala Serrano JA. In vivo functional and molecular characterization of the Penicillin-Binding Protein 4 (DacB) of Pseudomonas aeruginosa. BMC Microbiol 2016; 16:234. [PMID: 27716106 PMCID: PMC5054556 DOI: 10.1186/s12866-016-0853-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 09/27/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Community and nosocomial infections by Pseudomonas aeruginosa still create a major therapeutic challenge. The resistance of this opportunist pathogen to β-lactam antibiotics is determined mainly by production of the inactivating enzyme AmpC, a class C cephalosporinase with a regulation system more complex than those found in members of the Enterobacteriaceae family. This regulatory system also participates directly in peptidoglycan turnover and recycling. One of the regulatory mechanisms for AmpC expression, recently identified in clinical isolates, is the inactivation of LMM-PBP4 (Low-Molecular-Mass Penicillin-Binding Protein 4), a protein whose catalytic activity on natural substrates has remained uncharacterized until now. RESULTS We carried out in vivo activity trials for LMM-PBP4 of Pseudomonas aeruginosa on macromolecular peptidoglycan of Escherichia coli and Pseudomonas aeruginosa. The results showed a decrease in the relative quantity of dimeric, trimeric and anhydrous units, and a smaller reduction in monomer disaccharide pentapeptide (M5) levels, validating the occurrence of D,D-carboxypeptidase and D,D-endopeptidase activities. Under conditions of induction for this protein and cefoxitin treatment, the reduction in M5 is not fully efficient, implying that LMM-PBP4 of Pseudomonas aeruginosa presents better behaviour as a D,D-endopeptidase. Kinetic evaluation of the direct D,D-peptidase activity of this protein on natural muropeptides M5 and D45 confirmed this bifunctionality and the greater affinity of LMM-PBP4 for its dimeric substrate. A three-dimensional model for the monomeric unit of LMM-PBP4 provided structural information which supports its catalytic performance. CONCLUSIONS LMM-PBP4 of Pseudomonas aeruginosa is a bifunctional enzyme presenting both D,D-carboxypeptidase and D,D-endopeptidase activities; the D,D-endopeptidase function is predominant. Our study provides unprecedented functional and structural information which supports the proposal of this protein as a potential hydrolase-autolysin associated with peptidoglycan maturation and recycling. The fact that mutant PBP4 induces AmpC, may indicate that a putative muropeptide-subunit product of the DD-EPase activity of PBP4 could be a negative regulator of the pathway. This data contributes to understanding of the regulatory aspects of resistance to β-lactam antibiotics in this bacterial model.
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Affiliation(s)
- Cristian Gustavo Aguilera Rossi
- Departamento de Ciencias Preclínicas, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile.,Laboratorio de División Celular Bacteriana y Resistencia a Antibióticos, Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid-CSIC, Madrid, Spain
| | - Paulino Gómez-Puertas
- Grupo de Modelado Molecular, Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid-CSIC, Madrid, Spain
| | - Juan Alfonso Ayala Serrano
- Laboratorio de División Celular Bacteriana y Resistencia a Antibióticos, Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid-CSIC, Madrid, Spain.
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A comparative review towards potential of microbial cells for heavy metal removal with emphasis on biosorption and bioaccumulation. World J Microbiol Biotechnol 2016; 32:170. [DOI: 10.1007/s11274-016-2117-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Accepted: 07/25/2016] [Indexed: 10/21/2022]
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Trubl G, Solonenko N, Chittick L, Solonenko SA, Rich VI, Sullivan MB. Optimization of viral resuspension methods for carbon-rich soils along a permafrost thaw gradient. PeerJ 2016; 4:e1999. [PMID: 27231649 PMCID: PMC4878379 DOI: 10.7717/peerj.1999] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 04/11/2016] [Indexed: 01/23/2023] Open
Abstract
Permafrost stores approximately 50% of global soil carbon (C) in a frozen form; it is thawing rapidly under climate change, and little is known about viral communities in these soils or their roles in C cycling. In permafrost soils, microorganisms contribute significantly to C cycling, and characterizing them has recently been shown to improve prediction of ecosystem function. In other ecosystems, viruses have broad ecosystem and community impacts ranging from host cell mortality and organic matter cycling to horizontal gene transfer and reprogramming of core microbial metabolisms. Here we developed an optimized protocol to extract viruses from three types of high organic-matter peatland soils across a permafrost thaw gradient (palsa, moss-dominated bog, and sedge-dominated fen). Three separate experiments were used to evaluate the impact of chemical buffers, physical dispersion, storage conditions, and concentration and purification methods on viral yields. The most successful protocol, amended potassium citrate buffer with bead-beating or vortexing and BSA, yielded on average as much as 2-fold more virus-like particles (VLPs) g−1 of soil than other methods tested. All method combinations yielded VLPs g−1 of soil on the 108 order of magnitude across all three soil types. The different storage and concentration methods did not yield significantly more VLPs g−1 of soil among the soil types. This research provides much-needed guidelines for resuspending viruses from soils, specifically carbon-rich soils, paving the way for incorporating viruses into soil ecology studies.
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Affiliation(s)
- Gareth Trubl
- Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Current affiliation: Department of Microbiology, Ohio State University, Columbus, OH, United States
| | - Natalie Solonenko
- Current affiliation: Department of Microbiology, Ohio State University, Columbus, OH, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States
| | - Lauren Chittick
- Current affiliation: Department of Microbiology, Ohio State University, Columbus, OH, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States
| | - Sergei A Solonenko
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Current affiliation: Department of Ecology, Evolution and Organismal Biology, Ohio State University, Columbus, OH, United States
| | - Virginia I Rich
- Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Current affiliation: Department of Microbiology, Ohio State University, Columbus, OH, United States
| | - Matthew B Sullivan
- Current affiliation: Department of Microbiology, Ohio State University, Columbus, OH, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Current affiliation: Department of Ecology, Evolution and Organismal Biology, Ohio State University, Columbus, OH, United States; Current affiliation: Department of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH, United States
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Tran TT, Charles TC. Genome-engineeredSinorhizobium melilotifor the production of poly(lactic-co-3-hydroxybutyric) acid copolymer. Can J Microbiol 2016; 62:130-8. [PMID: 26639519 DOI: 10.1139/cjm-2015-0255] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Tam T. Tran
- Department of Biology, Faculty of Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
- Department of Biology, Faculty of Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
| | - Trevor C. Charles
- Department of Biology, Faculty of Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
- Department of Biology, Faculty of Science, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
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D’Amato F, Eldin C, Raoult D. The contribution of genomics to the study of Q fever. Future Microbiol 2016; 11:253-72. [DOI: 10.2217/fmb.15.137] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Coxiella burnetii is the etiological agent of Q fever, a worldwide zoonosis that can result in large outbreaks. The birth of genomics and sequencing of C. burnetii strains has revolutionized many fields of study of this infection. Accurate genotyping methods and comparative genomic analysis have enabled description of the diversity of strains around the world and their link with pathogenicity. Genomics has also permitted the development of qPCR tools and axenic culture medium, facilitating the diagnosis of Q fever. Moreover, several pathophysiological mechanisms can now be predicted and therapeutic strategies can be determined thanks to in silico genome analysis. An extensive pan-genomic analysis will allow for a comprehensive view of the clonal diversity of C. burnetii and its link with virulence.
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Affiliation(s)
- Felicetta D’Amato
- Aix-Marseille Université, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63, CNRS 7278, IRD 198, INSERM 1095, Marseille, France
| | - Carole Eldin
- Aix-Marseille Université, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63, CNRS 7278, IRD 198, INSERM 1095, Marseille, France
| | - Didier Raoult
- Aix-Marseille Université, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63, CNRS 7278, IRD 198, INSERM 1095, Marseille, France
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Waghu FH, Barai RS, Gurung P, Idicula-Thomas S. CAMPR3: a database on sequences, structures and signatures of antimicrobial peptides. Nucleic Acids Res 2015; 44:D1094-7. [PMID: 26467475 PMCID: PMC4702787 DOI: 10.1093/nar/gkv1051] [Citation(s) in RCA: 428] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 10/01/2015] [Indexed: 12/31/2022] Open
Abstract
Antimicrobial peptides (AMPs) are known to have family-specific sequence composition, which can be mined for discovery and design of AMPs. Here, we present CAMPR3; an update to the existing CAMP database available online at www.camp3.bicnirrh.res.in. It is a database of sequences, structures and family-specific signatures of prokaryotic and eukaryotic AMPs. Family-specific sequence signatures comprising of patterns and Hidden Markov Models were generated for 45 AMP families by analysing 1386 experimentally studied AMPs. These were further used to retrieve AMPs from online sequence databases. More than 4000 AMPs could be identified using these signatures. AMP family signatures provided in CAMPR3 can thus be used to accelerate and expand the discovery of AMPs. CAMPR3 presently holds 10247 sequences, 757 structures and 114 family-specific signatures of AMPs. Users can avail the sequence optimization algorithm for rational design of AMPs. The database integrated with tools for AMP sequence and structure analysis will be a valuable resource for family-based studies on AMPs.
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Affiliation(s)
- Faiza Hanif Waghu
- Biomedical Informatics Centre of Indian Council of Medical Research, National Institute for Research in Reproductive Health, Mumbai 400012, Maharashtra, India
| | - Ram Shankar Barai
- Biomedical Informatics Centre of Indian Council of Medical Research, National Institute for Research in Reproductive Health, Mumbai 400012, Maharashtra, India
| | - Pratima Gurung
- Biomedical Informatics Centre of Indian Council of Medical Research, National Institute for Research in Reproductive Health, Mumbai 400012, Maharashtra, India
| | - Susan Idicula-Thomas
- Biomedical Informatics Centre of Indian Council of Medical Research, National Institute for Research in Reproductive Health, Mumbai 400012, Maharashtra, India
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Ballesté-Delpierre C, Fàbrega A, Ferrer-Navarro M, Mathur R, Ghosh S, Vila J. Attenuation of in vitro host-pathogen interactions in quinolone-resistant Salmonella Typhi mutants. J Antimicrob Chemother 2015; 71:111-22. [PMID: 26446080 DOI: 10.1093/jac/dkv299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 08/22/2015] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVES The relationship between quinolone resistance acquisition and invasion impairment has been studied in some Salmonella enterica serovars. However, little information has been reported regarding the invasive human-restricted pathogen Salmonella Typhi. The aim of this study was to investigate the molecular mechanisms of quinolone resistance acquisition and its impact on virulence in this serovar. METHODS Two antibiotic-resistant mutants (Ty_c1 and Ty_c2) were generated from a Salmonella Typhi clinical isolate (Ty_wt). The three strains were compared in terms of antimicrobial susceptibility, molecular mechanisms of resistance, gene expression of virulence-related factors, ability to invade eukaryotic cells (human epithelial cells and macrophages) and cytokine production. RESULTS Multidrug resistance in Ty_c2 was attributed to AcrAB/TolC overproduction, decreased OmpF (both mediated by the mar regulon) and decreased OmpC. The two mutants showed a gradually reduced expression of virulence-related genes (invA, hilA, hilD, fliC and fimA), correlating with decreased motility, reduced infection of HeLa cells and impaired uptake by and intracellular survival in human macrophages. Moreover, Ty_c2 also showed reduced tviA expression. Additionally, we revealed a significant reduction in TNF-α and IL-1β production and decreased NF-κB activation. CONCLUSIONS In this study, we provide an in-depth characterization of the molecular mechanisms of antibiotic resistance in the Salmonella Typhi serovar and evidence that acquisition of antimicrobial resistance is concomitantly detected with a loss of virulence (epithelial cell invasion, macrophage phagocytosis and cytokine production). We suggest that the low prevalence of clinical isolates of Salmonella Typhi highly resistant to ciprofloxacin is due to poor immunogenicity and impaired dissemination ability of these isolates.
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Affiliation(s)
- Clara Ballesté-Delpierre
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Rosselló 149-153 Barcelona, 08036, Spain
| | - Anna Fàbrega
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Rosselló 149-153 Barcelona, 08036, Spain
| | - Mario Ferrer-Navarro
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Rosselló 149-153 Barcelona, 08036, Spain
| | - Ramkumar Mathur
- Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, 701 West 168th Street, New York City, NY 10032, USA
| | - Sankar Ghosh
- Department of Microbiology and Immunology, College of Physicians and Surgeons, Columbia University, 701 West 168th Street, New York City, NY 10032, USA
| | - Jordi Vila
- ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Rosselló 149-153 Barcelona, 08036, Spain
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Loss of TSS1 in hypervirulent Coxiella burnetii 175, the causative agent of Q fever in French Guiana. Comp Immunol Microbiol Infect Dis 2015; 41:35-41. [DOI: 10.1016/j.cimid.2015.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/23/2015] [Accepted: 04/28/2015] [Indexed: 11/17/2022]
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Parmar N, Nirmal Kumar J, Joshi C. Exploring diet-dependent shifts in methanogen and methanotroph diversity in the rumen of Mehsani buffalo by a metagenomics approach. FRONTIERS IN LIFE SCIENCE 2015. [DOI: 10.1080/21553769.2015.1063550] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Diba FS, Kim S, Lee HJ. Amperometric bioaffinity sensing platform for avian influenza virus proteins with aptamer modified gold nanoparticles on carbon chips. Biosens Bioelectron 2015; 72:355-61. [PMID: 26011543 DOI: 10.1016/j.bios.2015.05.020] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 05/05/2015] [Accepted: 05/07/2015] [Indexed: 12/20/2022]
Abstract
A sandwich assay platform involving a surface formed aptamer-protein-antibody complex was developed to obtain the highly selective and sensitive amperometric detection of H5N1 viral proteins using a gold nanoparticle (NP) modified electrode. This is the first aptamer-antibody pairing reported for the selective detection of H5N1. Nanoparticle deposited screen-printed carbon electrodes were first functionalized by the covalent immobilization of a DNA aptamer specific to H5N1 followed by the adsorption of H5N1 protein. Alkaline phosphatase (ALP) conjugated monoclonal antibody was then adsorbed to form a surface bound Au NPs-aptamer/H5N1/antiH5N1-ALP sandwich complex which was further reacted with the enzyme substrate, 4-amino phenyl phosphate (APP). The current associated with the electrocatalytic reaction of the surface bound ALP with APP increased as the H5N1 concentration increased. A lowest detectable concentration of 100 fM was obtained with a linear dynamic range of 100 fM to 10 pM using differential pulse voltammetry. As an example, the biosensor was applied to the detection of H5N1 protein in diluted human serum samples spiked with different concentrations of the viral protein target.
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Affiliation(s)
- Farhana Sharmin Diba
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu-city 702-701, Republic of Korea
| | - Suhee Kim
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu-city 702-701, Republic of Korea
| | - Hye Jin Lee
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Buk-gu, Daegu-city 702-701, Republic of Korea.
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Chang SW, Jo YK, Chang T, Jung G. Evidence for Genetic Similarity of Vegetative Compatibility Groupings in Sclerotinia homoeocarpa. THE PLANT PATHOLOGY JOURNAL 2014; 30:384-96. [PMID: 25506303 PMCID: PMC4262291 DOI: 10.5423/ppj.oa.08.2014.0075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 09/22/2014] [Accepted: 09/30/2014] [Indexed: 06/04/2023]
Abstract
Vegetative compatibility groups (VCGs) are determined for many fungi to test for the ability of fungal isolates to undergo heterokaryon formation. In several fungal plant pathogens, isolates belonging to a VCG have been shown to share significantly higher genetic similarity than those of different VCGs. In this study we sought to examine the relationship between VCG and genetic similarity of an important cool season turfgrass pathogen, Sclerotinia homoeocarpa. Twenty-two S. homoeocarpa isolates from the Midwest and Eastern US, which were previously characterized in several studies, were all evaluated for VCG using an improved nit mutant assay. These isolates were also genotyped using 19 microsatellites developed from partial genome sequence of S. homoeocarpa. Additionally, partial sequences of mitochondrial genes cytochrome oxidase II and mitochondrial small subunit (mtSSU) rRNA, and the atp6-rns intergenic spacer, were generated for isolates from each nit mutant VCG to determine if mitochondrial haplotypes differed among VCGs. Of the 22 isolates screened, 15 were amenable to the nit mutant VCG assay and were grouped into six VCGs. The 19 microsatellites gave 57 alleles for this set. Unweighted pair group methods with arithmetic mean (UPGMA) tree of binary microsatellite data were used to produce a dendrogram of the isolate genotypes based on microsatellite alleles, which showed high genetic similarity of nit mutant VCGs. Analysis of molecular variance of microsatellite data demonstrates that the current nit mutant VCGs explain the microsatellite genotypic variation among isolates better than the previous nit mutant VCGs or the conventionally determined VCGs. Mitochondrial sequences were identical among all isolates, suggesting that this marker type may not be informative for US populations of S. homoeocarpa.
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Affiliation(s)
- Seog Won Chang
- Turfgrass Science Institute, Hanul Inc., Hapcheon 678-803, Korea
| | - Young-Ki Jo
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, USA
| | - Taehyun Chang
- Department of Plant Resources and Environment, College of Ecology and Environmental Science, Kyungpook National University, Sangju 742-711, Korea
| | - Geunhwa Jung
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, USA
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Najafzadeh F, Jaberi G, Shapouri R, Rahnema M, Karimi- nik A, Kianmehr A. Immunogenicity comparison of conjugate vaccines composed of alginate and lipopolysaccharide of Pseudomonas aeruginosa bound to diphtheria toxoid. IRANIAN JOURNAL OF MICROBIOLOGY 2014; 6:317-23. [PMID: 25848521 PMCID: PMC4385571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND OBJECTIVES Treatment of Pseudomonas aeruginosa infections is greatly hampered by innate and acquired antibiotic resistance. The goal of this study was to compure the immunogenicity of conjugates of P. aeruginosa depolymerized alginate-diphtheria toxoid (D-ALGDT) and P. aeruginosa detoxified lipopolysaccharidediphtheria toxoid (D-LPSDT) in mouse model. MATERIALS AND METHODS Alginate and LPS were purified from P. aeruginosa strain PAO1. The resulting depolymerized alginate (D-ALG) and detoxified LPS (D-LPS) were covalently coupled to diphtheria toxoid (DT) as a carrier protein with adipic acid dihydrazide (ADH) as a spacer molecule and carbodiimide as a linker. Sterility, safety and pyrogenicity tests were performed. 30 mice in two groups were immunized intraperitoneally on days 0, 14 and 28 with 10 μg of D-ALGDT and D-LPSDT. Conjugates specific antibody levels were also determined by enzyme-linked immunosorbent assay (ELISA). RESULTS The conjugates were non-toxic and non-pyrogenic. Conjugates of D-ALGDT and D-LPSDT were shown to be safe and to elicit total IgG, IgM, IgA, IgG1, IgG2a, IgG2b and IgG3 antibodies in mice. ELISA results indicated that antibodies titer of D-ALGDT was more than D-LPSDT. CONCLUSION Immunization with D-ALGDT showed significant increase in all types of antibodies titers in versus D-LPSDT, suggesting D-ALGDT as a vaccine candidate against P. aeruginosa infections.
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Affiliation(s)
- Faezeh Najafzadeh
- Department of Microbiology, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Ghazaleh Jaberi
- Department of Microbiology, Science and Research Branch, Islamic Azad University, Kerman, Iran
| | - Reza Shapouri
- Biologic Research Center, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Mehdi Rahnema
- Biologic Research Center, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Ashraf Karimi- nik
- Department of Microbiology, Science and Research Branch, Islamic Azad University, Kerman, Iran
| | - Anvarsadat Kianmehr
- Medical Biotechnology Department, School of Advanced Medical Sciences, Tabriz University Of Medical Sciences, Tabriz, Iran,Corresponding Author: Anvarsadat Kianmehr, Address:Medical Biotechnology Department, School of Advanced Medical Sciences, Tabriz University Of Medical Sciences, Tabriz, Iran, Tel/Fax: +98-21-66402797,
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Wower IK, Zwieb C, Wower J. Requirements for resuming translation in chimeric transfer-messenger RNAs of Escherichia coli and Mycobacterium tuberculosis. BMC Mol Biol 2014; 15:19. [PMID: 25220282 PMCID: PMC4236655 DOI: 10.1186/1471-2199-15-19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 06/18/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Trans-translation is catalyzed by ribonucleprotein complexes composed of SmpB protein and transfer-messenger RNA. They release stalled ribosomes from truncated mRNAs and tag defective proteins for proteolytic degradation. Comparative sequence analysis of bacterial tmRNAs provides considerable insights into their secondary structures in which a tRNA-like domain and an mRNA-like region are connected by a variable number of pseudoknots. Progress toward understanding the molecular mechanism of trans-translation is hampered by our limited knowledge about the structure of tmRNA:SmpB complexes. RESULTS Complexes consisting of M. tuberculosis tmRNA and E. coli SmpB tag truncated proteins poorly in E. coli. In contrast, the tagging activity of E. coli tmRNA is well supported by M. tuberculosis SmpB that is expressed in E. coli. To investigate this incompatibility, we constructed 12 chimeric tmRNA molecules composed of structural features derived from both E. coli and M. tuberculosis. Our studies demonstrate that replacing the hp5-pk2-pk3-pk4 segment of E. coli tmRNA with the equivalent segment of M. tuberculosis tmRNA has no significant effect on the tagging efficiency of chimeric tmRNAs in the presence of E. coli SmpB. Replacing either helices 2b-2d, the single-stranded part of the ORF, pk1, or residues 79-89 of E. coli tmRNA with the equivalent features of M. tuberculosis tmRNA yields chimeric tmRNAs that are tagged at 68 to 88 percent of what is observed with E. coli tmRNA. Exchanging segments composed of either pk1 and the single-stranded segment upstream of the ORF or helices 2b-2d and pk1 results in markedly impaired tagging activity. CONCLUSION Our observations demonstrate the existence of functionally important but as yet uncharacterized structural constraints in the segment of tmRNA that connects its TLD to the ORF used for resuming translation. As trans-translation is important for the survival of M. tuberculosis, our work provides a new target for pharmacological intervention against multidrug-resistant tuberculosis.
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Azevedo FP, Morandini ACF, Sipert CR, Dionísio TJ, Santos CF, Damante CA, de Rezende MLR, Sant'ana ACP, Greghi SLA. Palatal mucosa derived fibroblasts present an adaptive behavior regarding cytokine secretion when grafted onto the gingival margin. BMC Oral Health 2014; 14:21. [PMID: 24646168 PMCID: PMC3994569 DOI: 10.1186/1472-6831-14-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 03/07/2014] [Indexed: 12/03/2022] Open
Abstract
Background Considering that grafted gingival tissue might have to be adapted to the receptor area and that fibroblasts have the ability to respond to bacterial stimuli through the release of various cytokines, this study investigated whether fibroblasts from the palatal mucosa behave differently when grafted onto the gingival margin regarding cytokine secretion. Methods Biopsies from the palatal mucosa were collected at the time of free gingival graft surgery, and after four months re-collection was performed upon surgery for root coverage. Fibroblasts were isolated by the explant technique, cultured and stimulated with Porphyromonas gingivalis (Pg) and Escherichia coli (Ec) LPS for 24 or 48 h for comparative evaluation of the secretion of cytokines and chemokines, such as IL-6, IL-8/CXCL8, MIP-1α/CCL3, TGF-β, VEGF and CXCL16. Unstimulated cells were used as the control group. Cells were tested for viability through MTT assay, and secretion of cytokines and chemokines was evaluated in the cell supernatants by Enzyme-Linked Immunosorbent Assay (ELISA). Results Fibroblasts from the palatal mucosa maintained the same secretion pattern of IL-6 when grafted onto the gingival margin. On the contrary, fibroblasts from the marginal gingival graft showed increased secretion of IL-8/CXCL8 even in the absence of stimulation. Interestingly, MIP-1α/CCL3 secretion by fibroblasts from the marginal gingival graft was significantly increased after 48 hours of stimulation with Pg LPS and after 24 h with Ec LPS. Only fibroblasts from the marginal gingival graft showed secretion of TGF-β. VEGF and CXCL16 secretion were not detected by both subsets of fibroblasts. Conclusion Fibroblasts from the palatal mucosa seem to be adapted to local conditions of the site microenvironment when grafted onto the gingival marginal area. This evidence supports the effective participation of fibroblasts in the homeostasis of the marginal periodontium through secretion modulation of important inflammatory mediators.
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Affiliation(s)
| | | | | | | | - Carlos Ferreira Santos
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil.
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Bacterial mechanisms for Cr(VI) resistance and reduction: an overview and recent advances. Folia Microbiol (Praha) 2014; 59:321-32. [PMID: 24470188 DOI: 10.1007/s12223-014-0304-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 01/12/2014] [Indexed: 01/16/2023]
Abstract
Chromium pollution is increasing incessantly due to continuing industrialization. Of various oxidation states, Cr(6+) is very toxic due to its carcinogenic and mutagenic nature. It also has deleterious effects on different microorganisms as well as on plants. Many species of bacteria thriving in the Cr(6+)-contaminated environments have evolved novel strategies to cope with Cr(6+) toxicity. Generally, decreased uptake or exclusion of Cr(6+) compounds through the membranes, biosorption, and the upregulation of genes associated with oxidative stress response are some of the resistance mechanisms in bacterial cells to overcome the Cr(6+) stress. In addition, bacterial Cr(6+) reduction into Cr(3+) is also a mechanism of specific significance as it transforms toxic and mobile chromium derivatives into reduced species which are innocuous and immobile. Ecologically, the bacterial trait of reductive immobilization of Cr(6+) derivatives is of great advantage in bioremediation. The present review is an effort to underline the bacterial resistance and reducing mechanisms to Cr(6+) compounds with recent development in order to garner a broad perspective.
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De Boevre M, Landschoot S, Audenaert K, Maene P, Di Mavungu D, Eeckhout M, Haesaert G, De Saeger S. Occurrence and within field variability of Fusarium mycotoxins and their masked forms in maize crops in Belgium. WORLD MYCOTOXIN J 2014. [DOI: 10.3920/wmj2013.1608] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Maize ear rot caused by several Fusarium species is an important fungal disease. Apart from yield losses, ear rot fungi can produce mycotoxins and masked forms in infected grains. Masked mycotoxins have received increased attention in view of their bioavailability and potential toxicity in animals and humans, but their presence and relevance in the field still remain undisclosed. To get a better insight, the present study assessed the presence of various Fusarium parent and masked mycotoxins, i.e. deoxynivalenol, 3-acetyldeoxynivalenol, 15-acetyldeoxynivalenol, deoxynivalenol-3-glucoside, zearalenone, α-zearalenol, β-zearalenol, zearalenone-14-glucoside, zearalenone-14-sulfate, α-zearalenol-14-glucoside, β-zearalenol-14-glucoside, T-2 and HT-2 toxin, in various commercial maize varieties grown under natural infection conditions in Flanders, Belgium. The results showed that the maize varieties were co-contaminated with both parent and masked mycotoxins. Moreover, a positive correlation between these forms was established. A higher contamination with a particular mycotoxin appeared to be coupled with an elevated load of another (masked) mycotoxin. The results highlight the importance to screen for multiple mycotoxins, both parent and masked, to guarantee food and feed safety. Furthermore, analysis was carried out to elucidate the distribution of the various mycotoxins in the field. The maize variety did not significantly influence mycotoxin accumulation, except for deoxynivalenol. Subdivisions in the field with higher mycotoxin levels for deoxynivalenol and its derivatives, zearalenone and its derivatives, and the sum of T-2 and HT-2 toxin were observed.
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Affiliation(s)
- M. De Boevre
- Department of Bioanalysis, Laboratory of Food Analysis, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
| | - S. Landschoot
- Department of Plant Production, Laboratory of Plant Pathology, Faculty of Applied Bioscience Engineering, University College Ghent, Building C, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
- Department of Crop Protection, Laboratory of Phytopathology, Ghent University, Coupure links 653, 9000 Ghent, Belgium
| | - K. Audenaert
- Department of Crop Protection, Laboratory of Phytopathology, Ghent University, Coupure links 653, 9000 Ghent, Belgium
| | - P. Maene
- Department of Food Science and Technology, Faculty of Applied Bioscience Engineering, University College Ghent, Building C, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Diana Di Mavungu
- Department of Bioanalysis, Laboratory of Food Analysis, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
| | - M. Eeckhout
- Department of Food Science and Technology, Faculty of Applied Bioscience Engineering, University College Ghent, Building C, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - G. Haesaert
- Department of Plant Production, Laboratory of Plant Pathology, Faculty of Applied Bioscience Engineering, University College Ghent, Building C, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
- Department of Crop Protection, Laboratory of Phytopathology, Ghent University, Coupure links 653, 9000 Ghent, Belgium
| | - S. De Saeger
- Department of Bioanalysis, Laboratory of Food Analysis, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
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Audenaert K, Vanheule A, Höfte M, Haesaert G. Deoxynivalenol: a major player in the multifaceted response of Fusarium to its environment. Toxins (Basel) 2013; 6:1-19. [PMID: 24451843 PMCID: PMC3920246 DOI: 10.3390/toxins6010001] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 12/16/2013] [Accepted: 12/16/2013] [Indexed: 12/21/2022] Open
Abstract
The mycotoxin deoxynivalenol (DON), produced by several Fusarium spp., acts as a virulence factor and is essential for symptom development after initial wheat infection. Accumulating evidence shows that the production of this secondary metabolite can be triggered by diverse environmental and cellular signals, implying that it might have additional roles during the life cycle of the fungus. Here, we review data that position DON in the saprophytic fitness of Fusarium, in defense and in the primary C and N metabolism of the plant and the fungus. We combine the available information in speculative models on the role of DON throughout the interaction with the host, providing working hypotheses that await experimental validation. We also highlight the possible impact of control measures in the field on DON production and summarize the influence of abiotic factors during processing and storage of food and feed matrices. Altogether, we can conclude that DON is a very important compound for Fusarium to cope with a changing environment and to assure its growth, survival, and production of toxic metabolites in diverse situations.
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Affiliation(s)
- Kris Audenaert
- Department of Applied BioSciences, Faculty Bioscience Engineering, Ghent University, Valentin Vaerwyckweg, 1, Ghent 9000, Belgium.
| | - Adriaan Vanheule
- Department of Applied BioSciences, Faculty Bioscience Engineering, Ghent University, Valentin Vaerwyckweg, 1, Ghent 9000, Belgium.
| | - Monica Höfte
- Department of Crop Protection, Laboratory of Phytopathology, Faculty Bioscience Engineering, Ghent University, Coupure links 653, Ghent 9000, Belgium.
| | - Geert Haesaert
- Department of Applied BioSciences, Faculty Bioscience Engineering, Ghent University, Valentin Vaerwyckweg, 1, Ghent 9000, Belgium.
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