1
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Exploring Bacterial Attributes That Underpin Symbiont Life in the Monogastric Gut. Appl Environ Microbiol 2022; 88:e0112822. [PMID: 36036591 PMCID: PMC9499014 DOI: 10.1128/aem.01128-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The large bowel of monogastric animals, such as that of humans, is home to a microbial community (microbiota) composed of a diversity of mostly bacterial species. Interrelationships between the microbiota as an entity and the host are complex and lifelong and are characteristic of a symbiosis. The relationships may be disrupted in association with disease, resulting in dysbiosis. Modifications to the microbiota to correct dysbiosis require knowledge of the fundamental mechanisms by which symbionts inhabit the gut. This review aims to summarize aspects of niche fitness of bacterial species that inhabit the monogastric gut, especially of humans, and to indicate the research path by which progress can be made in exploring bacterial attributes that underpin symbiont life in the gut.
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2
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Duboux S, Muller JA, De Franceschi F, Mercenier A, Kleerebezem M. Using fluorescent promoter-reporters to study sugar utilization control in Bifidobacterium longum NCC 2705. Sci Rep 2022; 12:10477. [PMID: 35729224 PMCID: PMC9213400 DOI: 10.1038/s41598-022-14638-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 06/09/2022] [Indexed: 02/01/2023] Open
Abstract
Bifidobacteria are amongst the first bacteria to colonize the human gastro-intestinal system and have been proposed to play a crucial role in the development of the infant gut since their absence is correlated to the development of diseases later in life. Bifidobacteria have the capacity to metabolize a diverse range of (complex) carbohydrates, reflecting their adaptation to the lower gastro-intestinal tract. Detailed understanding of carbohydrate metabolism regulation in this genus is of prime importance and availability of additional genetic tools easing such studies would be beneficial. To develop a fluorescent protein-based reporter system that can be used in B. longum NCC 2705, we first selected the most promising fluorescent protein out of the seven we tested (i.e., mCherry). This reporter protein was then used to study the carbohydrate mediated activation of PBl1518 and PBl1694, two promoters respectively predicted to be controlled by the transcriptional factors AraQ and AraU, previously suggested to regulate arabinose utilization and proposed to also act as global transcriptional regulators in bifidobacteria. We confirmed that in B. longum NCC 2705 the AraQ controlled promoter (PBl1518) is induced strongly by arabinose and established that the AraU controlled promoter (PBl1694) was mostly induced by the hexoses galactose and fructose. Combining the mCherry reporter system with flow cytometry, we established that NCC 2705 is able to co-metabolize arabinose and glucose while galactose was only consumed after glucose exhaustion, thus illustrating the complexity of different carbohydrate consumption patterns and their specific regulation in this strain.
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Affiliation(s)
- S Duboux
- Nestlé Research, Lausanne, Switzerland. .,Host-Microbe Interactomics Group, Wageningen University and Research, De Elst 1, 6708WD, Wageningen, The Netherlands.
| | | | | | - A Mercenier
- Host-Microbe Interactomics Group, Wageningen University and Research, De Elst 1, 6708WD, Wageningen, The Netherlands
| | - M Kleerebezem
- Host-Microbe Interactomics Group, Wageningen University and Research, De Elst 1, 6708WD, Wageningen, The Netherlands.
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3
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Cell factory for γ-aminobutyric acid (GABA) production using Bifidobacterium adolescentis. Microb Cell Fact 2022; 21:33. [PMID: 35255900 PMCID: PMC8903651 DOI: 10.1186/s12934-021-01729-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 12/20/2021] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Bifidobacteria are gram-positive, probiotic, and generally regarded as safe bacteria. Techniques such as transformation, gene knockout, and heterologous gene expression have been established for Bifidobacterium, indicating that this bacterium can be used as a cell factory platform. However, there are limited previous reports in this field, likely because of factors such as the highly anaerobic nature of this bacterium. Bifidobacterium adolescentis is among the most oxygen-sensitive Bifidobacterium species. It shows strain-specific gamma-aminobutyric acid (GABA) production. GABA is a potent bioactive compound with numerous physiological and psychological functions. In this study, we investigated whether B. adolesentis could be used for mass production of GABA.
Results
The B. adolescentis 4–2 strain isolated from a healthy adult human produced approximately 14 mM GABA. It carried gadB and gadC, which encode glutamate decarboxylase and glutamate GABA antiporter, respectively. We constructed pKKT427::Pori-gadBC and pKKT427::Pgap-gadBC plasmids carrying gadBC driven by the original gadB (ori) and gap promoters, respectively. Recombinants of Bifidobacterium were then constructed. Two recombinants with high production abilities, monitored by two different promoters, were investigated. GABA production was improved by adjusting the fermentation parameters, including the substrate concentration, initial culture pH, and co-factor supplementation, using response surface methodology. The optimum initial cultivation pH varied when the promoter region was changed. The ori promoter was induced under acidic conditions (pH 5.2:4.4), whereas the constitutive gap promoter showed enhanced GABA production at pH 6.0. Fed-batch fermentation was used to validate the optimum fermentation parameters, in which approximately 415 mM GABA was produced. The conversion ratio of glutamate to GABA was 92–100%.
Conclusion
We report high GABA production in recombinant B. adolescentis. This study provides a foundation for using Bifidobacterium as a cell factory platform for industrial production of GABA.
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4
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Singh RP, Shadan A, Ma Y. Biotechnological Applications of Probiotics: A Multifarious Weapon to Disease and Metabolic Abnormality. Probiotics Antimicrob Proteins 2022; 14:1184-1210. [PMID: 36121610 PMCID: PMC9483357 DOI: 10.1007/s12602-022-09992-8] [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] [Accepted: 08/30/2022] [Indexed: 12/25/2022]
Abstract
Consumption of live microorganisms "Probiotics" for health benefits and well-being is increasing worldwide. Their use as a therapeutic approach to confer health benefits has fascinated humans for centuries; however, its conceptuality gradually evolved with methodological advancement, thereby improving our understanding of probiotics-host interaction. However, the emerging concern regarding safety aspects of live microbial is enhancing the interest in non-viable or microbial cell extracts, as they could reduce the risks of microbial translocation and infection. Due to technical limitations in the production and formulation of traditionally used probiotics, the scientific community has been focusing on discovering new microbes to be used as probiotics. In many scientific studies, probiotics have been shown as potential tools to treat metabolic disorders such as obesity, type-2 diabetes, non-alcoholic fatty liver disease, digestive disorders (e.g., acute and antibiotic-associated diarrhea), and allergic disorders (e.g., eczema) in infants. However, the mechanistic insight of strain-specific probiotic action is still unknown. In the present review, we analyzed the scientific state-of-the-art regarding the mechanisms of probiotic action, its physiological and immuno-modulation on the host, and new direction regarding the development of next-generation probiotics. We discuss the use of recently discovered genetic tools and their applications for engineering the probiotic bacteria for various applications including food, biomedical applications, and other health benefits. Finally, the review addresses the future development of biological techniques in combination with clinical and preclinical studies to explain the molecular mechanism of action, and discover an ideal multifunctional probiotic bacterium.
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Affiliation(s)
- Rajnish Prakash Singh
- Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand India
| | - Afreen Shadan
- Dr. Shyama Prasad Mukherjee University, Ranchi, Jharkhand India
| | - Ying Ma
- College of Resource and Environment, Southwest University, Chongqing, China
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5
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Guo Q, Lin H, Chen P, Tan S, Wen Z, Lin L, He J, Wen J, Lu S. Dynamic changes of intestinal flora in patients with irritable bowel syndrome combined with anxiety and depression after oral administration of enterobacteria capsules. Bioengineered 2021; 12:11885-11897. [PMID: 34923901 PMCID: PMC8810103 DOI: 10.1080/21655979.2021.1999374] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This study investigated the clinical characteristics and dynamic changes of intestinal bacterial community to evaluate the curative effect of fecal microbiota transplantation (FMT) on irritable bowel syndrome with predominant diarrhea (IBS-D) comorbid with anxiety and depression. Total two treatments were designed in randomize-controlled trial includes oral FMT capsules with 1 week (A1), 8 weeks (A2), and 12 weeks (A3), as well as oral empty capsules with 1 week (B1), 8 weeks (B2), and 12 weeks (B3) as control for comparison. The positive therapeutic effects occurred in FMT colonized patient with IBS-D comorbid psychological disorder, demonstrated at alleviated IBS-D severity (IBS-SSS score from 291.11 reduced to 144.44), altered stool type (from 6 changed to 4), reduced anxiety and depression scores (from 18.33 to 8.39 and from 22.33 to 17.78) after FMT-treated 12 weeks. The FMT therapy improved bacterial alpha diversity and the majority bacterial community predominant by Bacteroidetes and Firmicutes, and the relative abundance (RA) was higher after FMT-treated 12 weeks (50.61% and 45.52%) than control (47.62% and 38.96%). In short, FMT therapy has great potential for IBS-D patients combined with anxiety and depression by alleviated clinical symptoms and restore the intestinal micro-ecology.
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Affiliation(s)
- Qingqing Guo
- Department of Intensive Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, China
| | - Hao Lin
- Shengli Clinical Medical College, Fujian Medical University, Fuzhou, Fujian, China.,Department of Gastroenterology, Fujian Provincial Hospital South Branch, Fuzhou, Fujian, China.,The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Pengcheng Chen
- Department of Health Management, Fujian Provincial Hospital South Branch, Fuzhou, Fujian, China
| | - Songlin Tan
- Department of Gastroenterology, Affiliated Ping Xiang Hospital, Southern Medical University, Pingxiang, Jiangxi, China
| | - Zhiyong Wen
- Department of Gastroenterology, Affiliated Ping Xiang Hospital, Southern Medical University, Pingxiang, Jiangxi, China
| | - Lijian Lin
- Department of Emergency, Fujian Provincial Hospital, Fujian Medical University, Fuzhou, Fujian, China
| | - Jianquan He
- School of Medicine, Xiamen University, Xiamen, China
| | - Jianbo Wen
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, China.,Department of Gastroenterology, Affiliated Ping Xiang Hospital, Southern Medical University, Pingxiang, Jiangxi, China
| | - Shiyun Lu
- Shengli Clinical Medical College, Fujian Medical University, Fuzhou, Fujian, China.,Department of Gastroenterology, Fujian Provincial Hospital South Branch, Fuzhou, Fujian, China
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A Resource for Cloning and Expression Vectors Designed for Bifidobacteria: Overview of Available Tools and Biotechnological Applications. Methods Mol Biol 2021. [PMID: 33649956 DOI: 10.1007/978-1-0716-1274-3_14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2023]
Abstract
Bifidobacteria represent an important group of (mostly) commensal microorganisms, which have enjoyed increasing scientific and industrial attention due to their purported health-promoting attributes. For the latter reason, several species have been granted "generally recognized as safe" (GRAS) and "qualified presumption of safety" (QPS) status by the Food and Drugs Administration (FDA) and European Food Safety Authority (EFSA) organizations. Increasing scientific evidence supports their potential as oral delivery vectors to produce bioactive and therapeutic molecules at intestinal level. In order to achieve an efficient utilization of bifidobacterial strains as health-promoting (food) ingredients, it is necessary to provide evidence on the molecular mechanisms behind their purported beneficial and probiotic traits, and precise mechanisms of interaction with their human (or other mammalian) host. In this context, developing appropriate molecular tools to generate and investigate recombinant strains is necessary. While bifidobacteria have long remained recalcitrant to genetic manipulation, a wide array of Bifidobacterium-specific replicating vectors and genetic modification procedures have been described in literature. The current chapter intends to provide an updated overview on the vectors used to genetically modify and manipulate bifidobacteria, including their general characteristics, reviewing examples of their use to successfully generate recombinant bifidobacterial strains for specific purposes, and providing a general workflow and cautions to design and conduct heterologous expression in bifidobacteria. Knowledge gaps and fields of research that may help to widen the molecular toolbox to improve the functional and technological potential of bifidobacteria are also discussed.
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7
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Hong N, Ku S, Yuk K, Johnston TV, Ji GE, Park MS. Production of biologically active human interleukin-10 by Bifidobacterium bifidum BGN4. Microb Cell Fact 2021; 20:16. [PMID: 33468130 PMCID: PMC7814708 DOI: 10.1186/s12934-020-01505-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 12/29/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Bifidobacterium spp. are representative probiotics that play an important role in the health of their hosts. Among various Bifidobacterium spp., B. bifidum BGN4 exhibits relatively high cell adhesion to colonic cells and has been reported to have various in vivo and in vitro bio functionalities (e.g., anti-allergic effect, anti-cancer effect, and modulatory effects on immune cells). Interleukin-10 (IL-10) has emerged as a major suppressor of immune response in macrophages and other antigen presenting cells and plays an essential role in the regulation and resolution of inflammation. In this study, recombinant B. bifidum BGN4 [pBESIL10] was developed to deliver human IL-10 effectively to the intestines. RESULTS The vector pBESIL10 was constructed by cloning the human IL-10 gene under a gap promoter and signal peptide from Bifidobacterium spp. into the E. coli-Bifidobacterium shuttle vector pBES2. The secreted human IL-10 from B. bifidum BGN4 [pBESIL10] was analyzed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), Western Blotting, and enzyme-linked immunosorbent assay (ELISA). More than 1,473 ± 300 ng/mL (n = 4) of human IL-10 was obtained in the cell free culture supernatant of B. bifidum BGN4 [pBESIL10]. This productivity is significantly higher than other previously reported human IL-10 level from food grade bacteria. In vitro functional evaluation of the cell free culture supernatant of B. bifidum BGN4 [pBESIL10] revealed significantly inhibited interleukin-6 (IL-6) production in lipopolysaccharide (LPS)-induced Raw 264.7 cells (n = 6, p < 0.0001) and interleukin-8 (IL-8) production in LPS-induced HT-29 cells (n = 6, p < 0.01) or TNFα-induced HT-29 cells (n = 6, p < 0.001). CONCLUSION B. bifidum BGN4 [pBESIL10] efficiently produces and secretes significant amounts of biologically active human IL-10. The human IL-10 production level in this study is the highest of all human IL-10 production reported to date. Further research should be pursued to evaluate B. bifidum BGN4 [pBESIL10] producing IL-10 as a treatment for various inflammation-related diseases, including inflammatory bowel disease, rheumatoid arthritis, allergic asthma, and cancer immunotherapy.
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Affiliation(s)
- Nayoun Hong
- Department of Food and Nutrition, Research Institute of Ecology, SeoulNationalUniversity, Seoul, 08826 Korea
| | - Seockmo Ku
- Fermentation Science Program, School of Agriculture, College of Basic and Applied Sciences, Middle Tennessee State University, Murfreesboro, TN 37132 USA
| | - Kyungjin Yuk
- Research Center, BIFIDO Co., Ltd, Hongcheon, 25117 Korea
| | - Tony V. Johnston
- Fermentation Science Program, School of Agriculture, College of Basic and Applied Sciences, Middle Tennessee State University, Murfreesboro, TN 37132 USA
| | - Geun Eog Ji
- Department of Food and Nutrition, Research Institute of Ecology, SeoulNationalUniversity, Seoul, 08826 Korea
- Research Center, BIFIDO Co., Ltd, Hongcheon, 25117 Korea
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8
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Kozakai T, Shimofusa Y, Nomura I, Suzuki T. Construction of a reporter system for bifidobacteria using chloramphenicol acetyltransferase and its application for evaluation of promoters and terminators. BIOSCIENCE OF MICROBIOTA FOOD AND HEALTH 2021; 40:115-122. [PMID: 33996368 PMCID: PMC8099631 DOI: 10.12938/bmfh.2020-070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/30/2020] [Indexed: 11/23/2022]
Abstract
A reporter assay system is an essential tool for investigating gene expression
mechanisms. In the case of bifidobacteria, several convenient and sensitive reporter
systems have been developed. Here, we developed a new reporter system for bifidobacteria
using the chloramphenicol acetyltransferase gene (cat) from
Staphylococcus aureus. This enzyme stoichiometrically produced free
CoA-SH, which was analyzed quantitatively with Ellman’s test using 2-nitrobenzoic acid
(DTNB). The 2-nitro-5-thiobenzoate (TNB2-) produced showed a strong yellowish
color with maximum absorbance at 412 nm. We also constructed a new pBCMAT plasmid series
for CAT assays in bifidobacteria to evaluate promoters and terminators. Analyses using
promoters from Bifidobacterium longum NCC2705 indicated that the CAT
assay using these promoters is quantitative, has a wide measurement range, and is stable.
In addition, this assay was useful for several bifidobacterial species, including
B. longum, Bifidobacterium breve, and
Bifidobacterium adolescentis. Compared with evoglow-Bs2, a fluorescent
protein used under anaerobic conditions, the CAT assay showed about 0.25% background
activity. In analyses using this CAT assay, we identified 11 promoters and 12 terminators
of B. longum NCC2705. The genes encoding ribosomal proteins, elongation
factors, and transfer RNAs possessed strong promoters, and terminators that include strong
stem-loops and poly-U tails structures tended to show high activities. Although the
abovementioned promoters made stronger contributions to expression activities than the
terminators, the maximum fold difference in the activities among the tested terminators
was approximately 17-fold. Modification of the -10 box and 5’-UTR in the
promoters and the structure around the stem-loop in the terminators affected expression
levels. These results suggest that the CAT assay is useful for various analyses of
bifidobacterial gene expression.
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Affiliation(s)
- Tomoya Kozakai
- United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Yoko Shimofusa
- Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Izumi Nomura
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
| | - Tohru Suzuki
- United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.,Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan
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9
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Engineer probiotic bifidobacteria for food and biomedical applications - Current status and future prospective. Biotechnol Adv 2020; 45:107654. [DOI: 10.1016/j.biotechadv.2020.107654] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 09/14/2020] [Accepted: 11/01/2020] [Indexed: 12/15/2022]
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10
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Structure of a Core Promoter in Bifidobacterium longum NCC2705. J Bacteriol 2020; 202:JB.00540-19. [PMID: 31964699 DOI: 10.1128/jb.00540-19] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 01/14/2020] [Indexed: 01/04/2023] Open
Abstract
Bacterial promoters consist of core sequence motifs termed -35 and -10 boxes. The consensus motifs are TTGACA and TATAAT, respectively, which were identified from leading investigations on Escherichia coli However, the consensus sequences are not likely to fit genetically divergent bacteria. The sigma factor of the genus Bifidobacterium has a characteristic polar domain in the N terminus, suggesting the possibility of specific promoter recognition. We reevaluated the structure of Bifidobacterium longum NCC2705 promoters and compared them to other bacteria. Transcriptional start sites (TSSs) of the B. longum NCC2705 strain were identified using transcriptome sequencing (RNA-Seq) analysis to extract promoter regions. Conserved motifs of a bifidobacterial promoter were determined using regions upstream of TSSs and a hidden Markov model. As a result, consensus motifs of the -35 and -10 boxes were TTGTGC and TACAAT, respectively. To assess each base of both motifs, we constructed 37 plasmids based on pKO403-TPCTcon, including the hup promoter connected with a chloramphenicol acetyltransferase as a reporter gene. This reporter assay showed two optimal motifs of the -35 and -10 boxes, namely, TTGNNN and TANNNT, respectively. We further analyzed spacer lengths between the -35 and -10 boxes via a bioinformatics approach. The spacer lengths predominant in bacteria have been generally reported to be approximately 17 bp. In contrast, the predominant spacer lengths in the genus Bifidobacterium and related species were 11 bp, in addition to 17 bp. A reporter assay to assess the spacer lengths indicated that the 11-bp spacer length produced unusually high activity.IMPORTANCE The structures of sigma factors vary among bacterial strains, indicating that recognition rules may also vary. Therefore, we investigated the promoter structure of Bifidobacterium longum NCC2705 using a bioinformatics approach and wet analyses. The most frequent and optimal motifs were similar to other bacterial consensus motifs. The optimal spacer length between the two boxes was reported to be 17 bp. It is widely applied to a bioinformatics approach for other bacteria. Unexpectedly, conserved spacer lengths were 11 bp as well as 17 bp in the genus Bifidobacterium Moreover, the sigma factor of the genus Bifidobacterium has a characteristic domain in the N terminus which may contribute to the additional functions. Hence, it would be valuable to reevaluate the promoter in other organisms.
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11
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Sun Z, Yue Z, Yang X, Hao X, Song M, Li L, Chen C, Chu C, Li C. Efficient Phytase Secretion and Phytate Degradation by Recombinant Bifidobacterium longum JCM 1217. Front Microbiol 2019; 10:796. [PMID: 31040837 PMCID: PMC6476914 DOI: 10.3389/fmicb.2019.00796] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 03/28/2019] [Indexed: 12/18/2022] Open
Abstract
Genetic engineering of probiotics, like bifidobacteria, may improve their microbial cell factory economy. This work designed a novel shuttle plasmid pBPES, which bears exogenous appA and is stable within Bifidobacterium longum JCM 1217. Cloning of three predicted promoters into pBPES proved that all of them drive appA expression in B. longum JCM 1217. Transformation of plasmids pBPES-tu and pBPES-groEL into B. longum JCM1217 resulted in much more phytase secretion suggests P tu and P groEL are strong promoters. Further in vitro and in vivo experiments suggested B. longum JCM 1217/pBPES-tu degrades phytate efficiently. In conclusion, the study screened two stronger promoters and constructed a recombinant live probiotic strain for effectively phytase secretion and phytate degradation in gut. The strategy used in the study provided a novel technique for improving the bioaccessibility of phytate and decreasing phosphorus excretion.
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Affiliation(s)
- Zhongke Sun
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China.,College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, China
| | - Zonghao Yue
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Xingdong Yang
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Xinqi Hao
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, China
| | - Maoping Song
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, China
| | - Lili Li
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China.,Key Laboratory of Plant Molecular Breeding and Bioreactor, Zhoukou, China
| | - Can Chen
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Cuiwei Chu
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Chengwei Li
- College of Life Sciences and Agronomy, Zhoukou Normal University, Zhoukou, China.,Key Laboratory of Plant Molecular Breeding and Bioreactor, Zhoukou, China
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12
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Thinbanmai T, Lulitanond V, Mayo B, Lulitanond A, Panya M. Cloning and expression of enterovirus 71 capsid protein 1 in a probiotic Bifidobacterium pseudocatenulatum. Lett Appl Microbiol 2018; 68:9-16. [PMID: 30357884 DOI: 10.1111/lam.13089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 10/03/2018] [Accepted: 10/03/2018] [Indexed: 12/19/2022]
Abstract
This study investigated cloning and expression of enterovirus 71 viral capsid protein 1 (EV71-VP1) in Bifidobacterium pseudocatenulatum (B. pseudocatenulatum) M115. To achieve this, a codon-optimized gene coding for EV71-VP1 was analysed, designed, synthesized and cloned into a plasmid vector flanked by a transcriptional promoter and terminator sequences. The promoter was based on that of P919, a constitutive promoter of the gene encoding the large ribosomal protein of B. bifidum BGN4, while the terminator was based on that of the peptidase N gene of Lactococcus lactis. The construct was amplified in Escherichia coli XL1-blue and then transferred into B. pseudocatenulatum M115 by electrotransformation. Western blot analysis revealed that the EV71-VP1 was intracellularly expressed in B. pseudocatenulatum M115 under the control of the selected heterologous promoter. In addition, plasmid stability analysis showed the construct was maintained stably for more than 160 generations, enough for most future applications. The results derived from this study open the possibility to utilize the bacterium carrying a specific expression plasmid as cell factory for the production of proteins with high commercial and health-promoting value. SIGNIFICANCE AND IMPACT OF THE STUDY: This study demonstrated the first successful expression of a codon-optimized gene coding for enterovirus 71 viral capsid protein 1 (EV71-VP1) in Bifidobacterium pseudocatenulatum M115, a novel probiotic strain isolated from human intestines. The EV71-VP1 was constitutively expressed under the control of P919 promoter derived from B. bifidum BGN4 in the cytoplasm of bacterial cells supporting the use of heterologous promoter and terminator sequences for viral gene expression in Bifidobacterium species.
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Affiliation(s)
- T Thinbanmai
- Department of Microbiology and Research and Diagnostic Center for Emerging Infectious Diseases, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - V Lulitanond
- Department of Microbiology and Research and Diagnostic Center for Emerging Infectious Diseases, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - B Mayo
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias (IPLA-CSIC), Villaviciosa, Spain
| | - A Lulitanond
- Department of Clinical Microbiology, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand
| | - M Panya
- College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani, Thailand
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13
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Arzamasov AA, van Sinderen D, Rodionov DA. Comparative Genomics Reveals the Regulatory Complexity of Bifidobacterial Arabinose and Arabino-Oligosaccharide Utilization. Front Microbiol 2018; 9:776. [PMID: 29740413 PMCID: PMC5928203 DOI: 10.3389/fmicb.2018.00776] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 04/05/2018] [Indexed: 11/13/2022] Open
Abstract
Members of the genus Bifidobacterium are common inhabitants of the human gastrointestinal tract. Previously it was shown that arabino-oligosaccharides (AOS) might act as prebiotics and stimulate the bifidobacterial growth in the gut. However, despite the rapid accumulation of genomic data, the precise mechanisms by which these sugars are utilized and associated transcription control still remain unclear. In the current study, we used a comparative genomic approach to reconstruct arabinose and AOS utilization pathways in over 40 bacterial species belonging to the Bifidobacteriaceae family. The results indicate that the gene repertoire involved in the catabolism of these sugars is highly diverse, and even phylogenetically close species may differ in their utilization capabilities. Using bioinformatics analysis we identified potential DNA-binding motifs and reconstructed putative regulons for the arabinose and AOS utilization genes in the Bifidobacteriaceae genomes. Six LacI-family transcriptional factors (named AbfR, AauR, AauU1, AauU2, BauR1 and BauR2) and a TetR-family regulator (XsaR) presumably act as local repressors for AOS utilization genes encoding various α- or β-L-arabinofuranosidases and predicted AOS transporters. The ROK-family regulator AraU and the LacI-family regulator AraQ control adjacent operons encoding putative arabinose transporters and catabolic enzymes, respectively. However, the AraQ regulator is universally present in all Bifidobacterium species including those lacking the arabinose catabolic genes araBDA, suggesting its control of other genes. Comparative genomic analyses of prospective AraQ-binding sites allowed the reconstruction of AraQ regulons and a proposed binary repression/activation mechanism. The conserved core of reconstructed AraQ regulons in bifidobacteria includes araBDA, as well as genes from the central glycolytic and fermentation pathways (pyk, eno, gap, tkt, tal, galM, ldh). The current study expands the range of genes involved in bifidobacterial arabinose/AOS utilization and demonstrates considerable variations in associated metabolic pathways and regulons. Detailed comparative and phylogenetic analyses allowed us to hypothesize how the identified reconstructed regulons evolved in bifidobacteria. Our findings may help to improve carbohydrate catabolic phenotype prediction and metabolic modeling, while it may also facilitate rational development of novel prebiotics.
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Affiliation(s)
- Aleksandr A Arzamasov
- A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia
| | - Douwe van Sinderen
- APC Microbiome Institute and School of Microbiology, University College Cork, Cork, Ireland
| | - Dmitry A Rodionov
- A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia.,Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
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Stevens MJ, Venturini A, Lacroix C, Meile L. Enhancing oxidative stress resistance in Bifidobacterium thermophilum using a novel overexpression vector and transformation protocol. Plasmid 2017; 92:43-48. [DOI: 10.1016/j.plasmid.2017.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 06/09/2017] [Accepted: 06/09/2017] [Indexed: 12/30/2022]
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15
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Osswald A, Sun Z, Grimm V, Ampem G, Riegel K, Westendorf AM, Sommergruber W, Otte K, Dürre P, Riedel CU. Three-dimensional tumor spheroids for in vitro analysis of bacteria as gene delivery vectors in tumor therapy. Microb Cell Fact 2015; 14:199. [PMID: 26655167 PMCID: PMC4676896 DOI: 10.1186/s12934-015-0383-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 11/11/2015] [Indexed: 12/31/2022] Open
Abstract
Background Several studies in animal models demonstrated that obligate and facultative anaerobic bacteria of the genera Bifidobacterium, Salmonella, or Clostridium specifically colonize solid tumors. Consequently, these and other bacteria are discussed as live vectors to deliver therapeutic genes to inhibit tumor growth. Therapeutic approaches for cancer treatment using anaerobic bacteria have been investigated in different mouse models. In the present study, solid three-dimensional (3D) multicellular tumor spheroids (MCTS) of the colorectal adenocarcinoma cell line HT-29 were generated and tested for their potential to study prodrug-converting enzyme therapies using bacterial vectors in vitro. Results HT-29 MCTS resembled solid tumors displaying all relevant features with an outer zone of proliferating cells and hypoxic and apoptotic regions in the core. Upon incubation with HT-29 MCTS, Bifidobacterium bifidum S17 and Salmonella typhimurium YB1 selectively localized, survived and replicated in hypoxic areas inside MCTS. Furthermore, spores of the obligate anaerobe Clostridium sporogenes germinated in these hypoxic areas. To further evaluate the potential of MCTS to investigate therapeutic approaches using bacteria as gene delivery vectors, recombinant bifidobacteria expressing prodrug-converting enzymes were used. Expression of a secreted cytosine deaminase in combination with 5-fluorocytosine had no effect on growth of MCTS due to an intrinsic resistance of HT-29 cells to 5-fluorouracil, i.e. the converted drug. However, a combination of the prodrug CB1954 and a strain expressing a secreted chromate reductase effectively inhibited MCTS growth. Conclusions Collectively, the presented results indicate that MCTS are a suitable and reliable model to investigate live bacteria as gene delivery vectors for cancer therapy in vitro. Electronic supplementary material The online version of this article (doi:10.1186/s12934-015-0383-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Annika Osswald
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany. .,Department of Lead Discovery, Boehringer Ingelheim RCV GmbH & Co KG, 1121, Vienna, Austria.
| | - Zhongke Sun
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany. .,College of Life Sciences and Agriculture, Zhoukou Normal University, Chuanhui District, Zhoukou, 466001, People's Republic of China.
| | - Verena Grimm
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany.
| | - Grace Ampem
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany.
| | - Karin Riegel
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany.
| | - Astrid M Westendorf
- Institute of Medical Microbiology, University Hospital Essen, University Duisburg-Essen, Essen, Germany.
| | - Wolfgang Sommergruber
- Department of Lead Discovery, Boehringer Ingelheim RCV GmbH & Co KG, 1121, Vienna, Austria.
| | - Kerstin Otte
- Institute of Applied Biotechnology, University of Applied Sciences Biberach, 88400, Biberach, Germany.
| | - Peter Dürre
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany.
| | - Christian U Riedel
- Institute of Microbiology and Biotechnology, University of Ulm, 89069, Ulm, Germany.
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