51
|
Dey P. Gut microbiota in phytopharmacology: A comprehensive overview of concepts, reciprocal interactions, biotransformations and mode of actions. Pharmacol Res 2019; 147:104367. [PMID: 31344423 DOI: 10.1016/j.phrs.2019.104367] [Citation(s) in RCA: 126] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 07/11/2019] [Accepted: 07/19/2019] [Indexed: 02/07/2023]
Abstract
The dynamic and delicate interactions amongst intestinal microbiota, metabolome and metabolism dictates human health and disease. In recent years, our understanding of gut microbial regulation of intestinal immunometabolic and redox homeostasis have evolved mainly out of in vivo studies associated with high-fat feeding induced metabolic diseases. Techniques utilizing fecal transplantation and germ-free mice have been instrumental in reproducibly demonstrating how the gut microbiota affects disease pathogenesis. However, the pillars of modern drug discovery i.e. evidence-based pharmacological studies critically lack focus on intestinal microflora. This is primarily due to targeted in vitro molecular-approaches at cellular-level that largely overlook the etiology of disease pathogenesis from the physiological perspective. Thus, this review aims to provide a comprehensive understanding of the key notions of intestinal microbiota and dysbiosis, and highlight the microbiota-phytochemical bidirectional interactions that affects bioavailability and bioactivity of parent phytochemicals and their metabolites. Potentially by focusing on the three major aspects of gut microbiota i.e. microbial abundance, diversity, and functions, I will discuss phytochemical-microbiota reciprocal interactions, biotransformation of phytochemicals and plant-derived drugs, and pre-clinical and clinical efficacies of herbal medicine on dysbiosis. Additionally, in relation to phytochemical pharmacology, I will briefly discuss the role of dietary-patterns associated with changes in microbial profiles and review pharmacological study models considering possible microbial effects. This review therefore, emphasize on the timely and critically needed evidence-based phytochemical studies focusing on gut microbiota and will provide newer insights for future pre-clinical and clinical phytopharmacological interventions.
Collapse
Affiliation(s)
- Priyankar Dey
- Human Nutrition Program, Department of Human Sciences, The Ohio State University, Columbus, Ohio, USA.
| |
Collapse
|
52
|
Han J. Chemical Aspects of Gut Metabolism of Flavonoids. Metabolites 2019; 9:metabo9070136. [PMID: 31295867 PMCID: PMC6680792 DOI: 10.3390/metabo9070136] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/06/2019] [Accepted: 07/09/2019] [Indexed: 11/16/2022] Open
Abstract
The intestine is a small world where all the chemical reactions are operated by gut microbiota. Study on the gut metabolism of natural products is a new and expanding research area that leads to new bioactive metabolites, as well as novel chemical reactions. To provide exemplary cases, flavonoid biotransformation by intestinal bacteria with focus on S-equol biosynthesis and aryl methyl ether cleavage reaction, is described in this review.
Collapse
Affiliation(s)
- Jaehong Han
- Metalloenzyme Research Group and Department of Plant Science and Technology, Chung-Ang University, Anseong 17546, Korea.
| |
Collapse
|
53
|
Valentine M, Benadé E, Mouton M, Khan W, Botha A. Binary interactions between the yeast Candida albicans and two gut-associated Bacteroides species. Microb Pathog 2019; 135:103619. [PMID: 31291601 DOI: 10.1016/j.micpath.2019.103619] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/11/2019] [Accepted: 07/06/2019] [Indexed: 01/15/2023]
Abstract
The yeast Candida albicans forms part of the natural gut microbiota of healthy human individuals and its interactions with other microbial symbionts can impact host well-being. We therefore studied binary interactions between potentially pathogenic representatives of the gut-associated bacterial genus Bacteroides and C. albicans using anaerobic bacteria/yeast co-cultures prepared with a quarter-strength brain heart infusion (¼ BHI; 9.25 g/l) broth. We found that, except for minor changes observed in the cell numbers of one out of four C. albicans strains tested, yeast growth was largely unaffected by the presence of the bacteria. In contrast, growth of Bacteroides fragilis NCTC 9343 and Bacteroides vulgatus ATCC 8482 was significantly enhanced in the presence of C. albicans. Supplementation of Bacteroides monocultures with dead Candida albicans CAB 392 cells, containing intact outer cell wall mannan layers, resulted in increased bacterial concentrations. Subsequent culturing of the Bacteroides strains in a liquid minimal medium supplemented with candidal mannan demonstrated that B. vulgatus ATCC 8482, unlike B. fragilis NCTC 9343, utilized the mannan. Furthermore, by reducing the initial oxygen levels in monocultures prepared with ¼ BHI broth, bacterial numbers were significantly enhanced compared to in monocultures prepared with ¼ BHI broth not supplemented with the reducing agent l-cysteine hydrochloride. This suggests that C. albicans can stimulate Bacteroides growth via aerobic respiration and/or antioxidant production. The cell-free supernatant of 24-h-old C. albicans CAB 392 monocultures was also found to increase Bacteroides growth and chloramphenicol sensitivity.
Collapse
Affiliation(s)
- Marisa Valentine
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Eliska Benadé
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Marnel Mouton
- Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa
| | - Wesaal Khan
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Alfred Botha
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa.
| |
Collapse
|
54
|
Liu R, Yu X, Chen X, Zhong H, Liang C, Xu X, Xu W, Cheng Y, Wang W, Yu L, Wu Y, Yan N, Hu X. Individual factors define the overall effects of dietary genistein exposure on breast cancer patients. Nutr Res 2019; 67:1-16. [DOI: 10.1016/j.nutres.2019.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 03/03/2019] [Accepted: 03/25/2019] [Indexed: 12/18/2022]
|
55
|
Transcriptional Regulation of the Equol Biosynthesis Gene Cluster in Adlercreutzia equolifaciens DSM19450 T. Nutrients 2019; 11:nu11050993. [PMID: 31052328 PMCID: PMC6566806 DOI: 10.3390/nu11050993] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 02/06/2023] Open
Abstract
Given the emerging evidence of equol’s benefit to human health, understanding its synthesis and regulation in equol-producing bacteria is of paramount importance. Adlercreutzia equolifaciens DSM19450T is a human intestinal bacterium—for which the whole genome sequence is publicly available—that produces equol from the daidzein isoflavone. In the present work, daidzein (between 50 to 200 μM) was completely metabolized by cultures of A. equolifaciens DSM19450T after 10 h of incubation. However, only about one third of the added isoflavone was transformed into dihydrodaidzein and then into equol. Transcriptional analysis of the ORFs and intergenic regions of the bacterium’s equol gene cluster was therefore undertaken using RT-PCR and RT-qPCR techniques with the aim of identifying the genetic elements of equol biosynthesis and its regulation mechanisms. Compared to controls cultured without daidzein, the expression of all 13 contiguous genes in the equol cluster was enhanced in the presence of the isoflavone. Depending on the gene and the amount of daidzein in the medium, overexpression varied from 0.5- to about 4-log10 units. Four expression patterns of transcription were identified involving genes within the cluster. The genes dzr, ddr and tdr, which code for daidzein reductase, dihydrodaidzein reductase and tetrahydrodaidzein reductase respectively, and which have been shown involved in equol biosynthesis, were among the most strongly expressed genes in the cluster. These expression patterns correlated with the location of four putative ρ-independent terminator sequences in the cluster. All the intergenic regions were amplified by RT-PCR, indicating the operon to be transcribed as a single RNA molecule. These findings provide new knowledge on the metabolic transformation of daidzein into equol by A. equolifaciens DSM19450T, which might help in efforts to increase the endogenous formation of this compound and/or its biotechnological production.
Collapse
|
56
|
Abstract
Covering: up to the end of 2017 The human body is composed of an equal number of human and microbial cells. While the microbial community inhabiting the human gastrointestinal tract plays an essential role in host health, these organisms have also been connected to various diseases. Yet, the gut microbial functions that modulate host biology are not well established. In this review, we describe metabolic functions of the human gut microbiota that involve metalloenzymes. These activities enable gut microbial colonization, mediate interactions with the host, and impact human health and disease. We highlight cases in which enzyme characterization has advanced our understanding of the gut microbiota and examples that illustrate the diverse ways in which metalloenzymes facilitate both essential and unique functions of this community. Finally, we analyze Human Microbiome Project sequencing datasets to assess the distribution of a prominent family of metalloenzymes in human-associated microbial communities, guiding future enzyme characterization efforts.
Collapse
|
57
|
Wu XM, Tan RX. Interaction between gut microbiota and ethnomedicine constituents. Nat Prod Rep 2019; 36:788-809. [DOI: 10.1039/c8np00041g] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This highlight reviews the interaction processes between gut microbiota and ethnomedicine constituents, which may conceptualize future therapeutic strategies.
Collapse
Affiliation(s)
- Xue Ming Wu
- State Key Laboratory Cultivation Base for TCM Quality and Efficacy
- Nanjing University of Chinese Medicine
- Nanjing
- China
| | - Ren Xiang Tan
- State Key Laboratory Cultivation Base for TCM Quality and Efficacy
- Nanjing University of Chinese Medicine
- Nanjing
- China
- State Key Laboratory of Pharmaceutical Biotechnology
| |
Collapse
|
58
|
Lee PG, Lee UJ, Song H, Choi KY, Kim BG. Recent advances in the microbial hydroxylation and reduction of soy isoflavones. FEMS Microbiol Lett 2018; 365:5089968. [PMID: 30184116 DOI: 10.1093/femsle/fny195] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 08/31/2018] [Indexed: 12/17/2023] Open
Abstract
Soy isoflavones are naturally occurring phytochemicals, which are biotransformed into functional derivatives through oxidative and reductive metabolic pathways of diverse microorganisms. Such representative derivatives, ortho-dihydroxyisoflavones (ODIs) and equols, have attracted great attention for their versatile health benefits since they were found from soybean fermented foods and human intestinal fluids. Recently, scientists in food technology, nutrition and microbiology began to understand their correct biosynthetic pathways and nutraceutical values, and have attempted to produce the valuable bioactive compounds using microbial fermentation and whole-cell/enzyme-based biotransformation. Furthermore, artificial design of microbial catalysts and/or protein engineering of oxidoreductases were also conducted to enhance production efficiency and regioselectivity of products. This minireview summarizes and introduces the past year's studies and recent advances in notable production of ODIs and equols, and provides information on available microbial species and their catalytic performance with perspectives on industrial application.
Collapse
Affiliation(s)
- Pyung-Gang Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Uk-Jae Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Hanbit Song
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Kwon-Young Choi
- Department of Environmental Engineering, College of Engineering, Ajou University, Suwon 16499, Republic of Korea
| | - Byung-Gee Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
- Bioengineering Institute, Seoul National University, Seoul 08826, South Korea
- Institute of Bioengineering Research, Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
59
|
Kawada Y, Goshima T, Sawamura R, Yokoyama SI, Yanase E, Niwa T, Ebihara A, Inagaki M, Yamaguchi K, Kuwata K, Kato Y, Sakurada O, Suzuki T. Daidzein reductase of Eggerthella sp. YY7918, its octameric subunit structure containing FMN/FAD/4Fe-4S, and its enantioselective production of R-dihydroisoflavones. J Biosci Bioeng 2018; 126:301-309. [PMID: 29699942 DOI: 10.1016/j.jbiosc.2018.03.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 03/20/2018] [Accepted: 03/23/2018] [Indexed: 12/29/2022]
Abstract
S-Equol is a metabolite of daidzein, a type of soy isoflavone, and three reductases are involved in the conversion of daidzein by specific intestinal bacteria. S-Equol is thought to prevent hormone-dependent diseases. We previously identified the equol producing gene cluster (eqlABC) of Eggerthella sp. YY7918. Daidzein reductase (DZNR), encoded by eqlA, catalyzes the reduction of daidzein to dihydrodaidzein (the first step of equol synthesis), which was confirmed using a recombinant enzyme produced in Escherichia coli. Here, we purified recombinant DZNR to homogeneity and analyzed its enzymological properties. DZNR contained FMN, FAD, and one 4Fe-4S cluster per 70-kDa subunit as enzymatic cofactors. DZNR reduced the CC bond between the C-2 and C-3 positions of daidzein, genistein, glycitein, and formononetin in the presence of NADPH. R-Dihydrodaidzein and R-dihydrogenistein were highly stereo-selectively produced from daidzein and genistein. The Km and kcat for daidzein were 11.9 μM and 6.7 s-1, and these values for genistein were 74.1 μM and 28.3 s-1, respectively. This enzyme showed similar kinetic parameters and wide substrate specificity for isoflavone molecules. Thus, this enzyme appears to be an isoflavone reductase. Gel filtration chromatography and chemical cross-linking analysis of the active form of DZNR suggested that the enzyme consists of an octameric subunit structure. We confirmed this by small-angle X-ray scattering and transmission electron microscopy at a magnification of ×200,000. DZNR formed a globular four-petal cloverleaf structure with a central vertical hole. The maximum particle size was 173 Å.
Collapse
Affiliation(s)
- Yuika Kawada
- United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Tomoko Goshima
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Rie Sawamura
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Shin-Ichiro Yokoyama
- Department of Food Technology, Industrial Technology Center, Gifu Prefectural Government, 47 Kitaoyobi, Kasamatsu, Hashima, Gifu 501-6064, Japan
| | - Emiko Yanase
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Toshio Niwa
- Faculty of Health and Nutrition, Shubun University, 6 Nikko-cho, Ichinomiya, Aichi 491-0938, Japan
| | - Akio Ebihara
- United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan; Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan; Center for Highly Advanced Integration of Nano and Life Sciences, Gifu University (G-CHAIN), Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Mizuho Inagaki
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Keiichi Yamaguchi
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Kazuo Kuwata
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan; Center for Highly Advanced Integration of Nano and Life Sciences, Gifu University (G-CHAIN), Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Yuta Kato
- Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Osamu Sakurada
- Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Tohru Suzuki
- United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan; Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
| |
Collapse
|
60
|
Freedman SN, Shahi SK, Mangalam AK. The "Gut Feeling": Breaking Down the Role of Gut Microbiome in Multiple Sclerosis. Neurotherapeutics 2018; 15:109-125. [PMID: 29204955 PMCID: PMC5794701 DOI: 10.1007/s13311-017-0588-x] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) is a chronic neuroinflammatory disease of the central nervous system with unknown etiology. Recently, the gut microbiota has emerged as a potential factor in the development of MS, with a number of studies having shown that patients with MS exhibit gut dysbiosis. The gut microbiota helps the host remain healthy by regulating various functions, including food metabolism, energy homeostasis, maintenance of the intestinal barrier, inhibition of colonization by pathogenic organisms, and shaping of both mucosal and systemic immune responses. Alteration of the gut microbiota, and subsequent changes in its metabolic network that perturb this homeostasis, may lead to intestinal and systemic disorders such as MS. Here we discuss the findings of recent MS microbiome studies and potential mechanisms through which gut microbiota can predispose to, or protect against, MS. These findings highlight the need of an improved understanding of the interactions between the microbiota and host for developing therapies based on gut commensals with which to treat MS.
Collapse
Affiliation(s)
- Samantha N Freedman
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Shailesh K Shahi
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Ashutosh K Mangalam
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA.
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.
| |
Collapse
|
61
|
Dowd A. Elucidating Cellular Metabolism and Protein Difference Data from DIGE Proteomics Experiments Using Enzyme Assays. Methods Mol Biol 2018; 1664:261-278. [PMID: 29019139 DOI: 10.1007/978-1-4939-7268-5_20] [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] [Indexed: 06/07/2023]
Abstract
Assays for measuring enzyme activity can be useful tools for proteomics applications. Enzyme testing can be performed to validate an experimental system prior to a Difference Gel Electrophoresis (DIGE) proteomic experiment and can also be utilized as an integral part of multifaceted experiment in conjunction with DIGE. Data from enzyme tests can be used to corroborate results of DIGE proteomic experiments where an enzyme or enzymes are demonstrated by DIGE to be differentially expressed. Enzyme testing can also be utilized to support data from DIGE experiments that demonstrate metabolic changes in a biological system. The different types of enzyme assays that can be performed in conjunction with DIGE experiments are reviewed alongside a discussion of experimental approaches for designing enzyme assays.
Collapse
Affiliation(s)
- Andrew Dowd
- Monaghan Biosciences, Tyholland, Co. Monaghan, Ireland.
| |
Collapse
|
62
|
Tao JH, Zhao M, Jiang S, Pu XL, Wei XY. Comparative metabolism of two major compounds in Fructus Corni extracts by gut microflora from normal and chronic nephropathy rats in vitro by UPLC-Q-TOF/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1073:170-176. [DOI: 10.1016/j.jchromb.2017.12.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 12/15/2017] [Accepted: 12/18/2017] [Indexed: 02/06/2023]
|
63
|
Braune A, Blaut M. Evaluation of inter-individual differences in gut bacterial isoflavone bioactivation in humans by PCR-based targeting of genes involved in equol formation. J Appl Microbiol 2017; 124:220-231. [PMID: 29055162 DOI: 10.1111/jam.13616] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 09/26/2017] [Accepted: 10/17/2017] [Indexed: 02/06/2023]
Abstract
AIM To identify human subjects harbouring intestinal bacteria that bioactivate daidzein to equol using a targeted PCR-based approach. METHODS AND RESULTS In a pilot study including 17 human subjects, equol formation was determined in faecal slurries. In parallel, faecal DNA was amplified by PCR using degenerate primers that target highly conserved regions of dihydrodaidzein reductase and tetrahydrodaidzein reductase genes. PCR products of the expected size were observed for six of the eight subjects identified as equol producers. Analysis of clone libraries revealed the amplification of sequences exclusively related to Adlercreutzia equolifaciens in four of the subjects tested positive for equol formation, whereas in three of the equol producers, only sequences related to Slackia isoflavoniconvertens were observed. No amplicons were obtained for one equol-forming subject, thus suggesting the presence of nontargeted alternative genes. Amplicons were only sporadically observed in the nonequol producers. CONCLUSION The majority of human subjects who produced equol were also detected with the developed PCR-based approach. SIGNIFICANCE AND IMPACT OF THE STUDY The obtained results shed light on the distribution and the diversity of known equol-forming bacterial species in the study group and indicate the presence of as yet unknown equol-forming bacteria.
Collapse
Affiliation(s)
- A Braune
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - M Blaut
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| |
Collapse
|
64
|
Lee PG, Kim J, Kim EJ, Lee SH, Choi KY, Kazlauskas RJ, Kim BG. Biosynthesis of (-)-5-Hydroxy-equol and 5-Hydroxy-dehydroequol from Soy Isoflavone, Genistein Using Microbial Whole Cell Bioconversion. ACS Chem Biol 2017; 12:2883-2890. [PMID: 28985044 DOI: 10.1021/acschembio.7b00624] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Equols are isoflavandiols formed by reduction of soy isoflavones such as daidzein and genistein by gut microorganisms. These phytoestrogens are of interest for their various biological effects. We report biosynthesis from genistein to (-)-5-hydroxy-equol in recombinant E. coli expressing three reductases (daidzein reductase DZNR, dihidrodaidzein reductase DHDR, tetrahydrodaidzein reductase THDR) and a racemase (dihydrodaidzein racemase, DDRC) originating from the gut bacterium, Slackia isoflavoniconvertens. The biosynthesized 5-hydroxy-equol proved as an optically negative enantiomer, nonetheless it displayed an inverse circular dichroism spectrum to (S)-equol. Compartmentalized expression of DZNR and DDRC in one E. coli strain and DHDR and THDR in another increased the yield to 230 mg/L and the productivity to 38 mg/L/h. If the last reductase was missing, the intermediate spontaneously dehydrated to 5-hydroxy-dehydroequol in up to 99 mg/L yield. This novel isoflavene, previously not known to be synthesized in nature, was also detected in this biotransformation system. Although (S)-equol favors binding to human estrogen receptor (hER) β over hERα, (-)-5-hydroxy-equol showed the opposite preference. This study provides elucidation of the biosynthetic route of (-)-5-hydroxy-equol and measurement of its potent antagonistic character as a phytoestrogen for the first time.
Collapse
Affiliation(s)
- Pyung-Gang Lee
- School of Chemical
and Biological Engineering, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
- Institute
of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Joonwon Kim
- School of Chemical
and Biological Engineering, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
- Institute
of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Eun-Jung Kim
- Institute
of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Sang-Hyuk Lee
- School of Chemical
and Biological Engineering, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
- Institute
of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
| | - Kwon-Young Choi
- Department of Environmental
Engineering, College of Engineering, Ajou University, Suwon, Republic of Korea
| | - Romas J. Kazlauskas
- Department of Biochemistry, Molecular Biology & Biophysics and The Biotechnology Institute, University of Minnesota, Saint Paul, Minnesota 55108, United States
| | - Byung-Gee Kim
- School of Chemical
and Biological Engineering, Institute of Engineering Research, Seoul National University, Seoul, Republic of Korea
- Institute
of Molecular Biology and Genetics, Seoul National University, Seoul, Republic of Korea
- Institute
of Bioengineering, Seoul National University, Seoul, Republic of Korea
| |
Collapse
|
65
|
Shortt C, Hasselwander O, Meynier A, Nauta A, Fernández EN, Putz P, Rowland I, Swann J, Türk J, Vermeiren J, Antoine JM. Systematic review of the effects of the intestinal microbiota on selected nutrients and non-nutrients. Eur J Nutr 2017; 57:25-49. [PMID: 29086061 PMCID: PMC5847024 DOI: 10.1007/s00394-017-1546-4] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 09/20/2017] [Indexed: 12/28/2022]
Abstract
PURPOSE There is considerable interest in the effects of the intestinal microbiota (IM) composition, its activities in relation with the metabolism of dietary substrates and the impact these effects may have in the development and prevention of certain non-communicable diseases. It is acknowledged that a complex interdependence exists between the IM and the mammalian host and that the IM possesses a far greater diversity of genes and repertoire of metabolic and enzymatic capabilities than their hosts. However, full knowledge of the metabolic activities and interactions of the IM and the functional redundancy that may exist are lacking. Thus, the current review aims to assess recent literature relating to the role played by the IM in the absorption and metabolism of key nutrients and non-nutrients. METHODS A systematic review (PROSPERO registration: CRD42015019087) was carried out focussing on energy and the following candidate dietary substrates: protein, carbohydrate, fat, fibre, resistant starch (RS), and polyphenols to further understand the effect of the IM on the dietary substrates and the resulting by-products and host impacts. Particular attention was paid to the characterisation of the IM which are predominantly implicated in each case, changes in metabolites, and indirect markers and any potential impacts on the host. RESULTS Studies show that the IM plays a key role in the metabolism of the substrates studied. However, with the exception of studies focusing on fibre and polyphenols, there have been relatively few recent human studies specifically evaluating microbial metabolism. In addition, comparison of the effects of the IM across studies was difficult due to lack of specific analysis/description of the bacteria involved. Considerable animal-derived data exist, but experience suggests that care must be taken when extrapolating these results to humans. Nevertheless, it appears that the IM plays a role in energy homeostasis and that protein microbial breakdown and fermentation produced ammonia, amines, phenols and branch chain fatty acids, and a greater diversity in the microbes present. Few recent studies appear to have evaluated the effect of the IM composition and metabolism per se in relation with digestible dietary carbohydrate or fat in humans. Intakes of RS and prebiotics altered levels of specific taxa that selectively metabolised specific prebiotic/carbohydrate-type substances and levels of bifidobacteria and lactobacilli were observed to increase. In controlled human studies, consistent data exist that show a correlation between the intake of fibre and an increase in bifidobacteria and short-chain fatty acids, in particular butyrate, which leads to lower intestinal pH. Dietary polyphenols rely on modification either by host digestive enzymes or those derived from the IM for absorption to occur. In the polyphenol-related studies, a large amount of inter-individual variation was observed in the microbial metabolism and absorption of certain polyphenols. CONCLUSIONS The systematic review demonstrates that the IM plays a major role in the breakdown and transformation of the dietary substrates examined. However, recent human data are limited with the exception of data from studies examining fibres and polyphenols. Results observed in relation with dietary substrates were not always consistent or coherent across studies and methodological limitations and differences in IM analyses made comparisons difficult. Moreover, non-digestible components likely to reach the colon are often not well defined or characterised in studies making comparisons between studies difficult if not impossible. Going forward, further rigorously controlled randomised human trials with well-defined dietary substrates and utilizing omic-based technologies to characterise and measure the IM and their functional activities will advance the field. Current evidence suggests that more detailed knowledge of the metabolic activities and interactions of the IM hold considerable promise in relation with host health.
Collapse
Affiliation(s)
- Colette Shortt
- Johnson & Johnson EAME, Foundation Park, Maidenhead, SL6 3UG, UK.
| | - Oliver Hasselwander
- DuPont Nutrition and Health, c/o Danisco (UK) Ltd., 43 London Road, Reigate, Surrey, RH2 9PW, UK
| | | | - Arjen Nauta
- FrieslandCampina, Stationsplein 4, 3818 LE, Amersfoort, The Netherlands
| | | | - Peter Putz
- University of Applied Sciences, FH Campus Wien, 1100, Vienna, Austria
| | - Ian Rowland
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading, RG6 6AP, UK
| | - Jonathan Swann
- Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Jessica Türk
- Yakult Germany, Forumstraße 2, 41468, Neuss, Germany
| | - Joan Vermeiren
- Cargill R&D Centre Europe, Havenstraat 84, 1800, Vilvoorde, Belgium
| | | |
Collapse
|
66
|
Vázquez L, Guadamuro L, Giganto F, Mayo B, Flórez AB. Development and Use of a Real-Time Quantitative PCR Method for Detecting and Quantifying Equol-Producing Bacteria in Human Faecal Samples and Slurry Cultures. Front Microbiol 2017; 8:1155. [PMID: 28713336 PMCID: PMC5491606 DOI: 10.3389/fmicb.2017.01155] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/07/2017] [Indexed: 12/23/2022] Open
Abstract
This work introduces a novel real-time quantitative PCR (qPCR) protocol for detecting and quantifying equol-producing bacteria. To this end, two sets of primers targeting the dihydrodaidzein reductase (ddr) and tetrahydrodaidzein reductase (tdr) genes, which are involved in the synthesis of equol, were designed. The primers showed high specificity and sensitivity when used to examine DNA from control bacteria, such as Slackia isoflavoniconvertens, Slackia equolifaciens, Asaccharobacter celatus, Adlercreutzia equolifaciens, and Enterorhabdus mucosicola. To demonstrate the validity and reliability of the protocol, it was used to detect and quantify equol-producing bacteria in human faecal samples and their derived slurry cultures. These samples were provided by 18 menopausal women under treatment of menopause symptoms with a soy isoflavone concentrate, among whom three were known to be equol-producers given the prior detection of the molecule in their urine. The tdr gene was detected in the faeces of all these equol-producing women at about 4–5 log10 copies per gram of faeces. In contrast, the ddr gene was only amplified in the faecal samples of two of these three women, suggesting the presence in the non-amplified sample of reductase genes unrelated to those known to be involved in equol formation and used for primer design in this study. When tdr and ddr were present in the same sample, similar copy numbers of the two genes were recorded. However, no significant increase in the copy number of equol-related genes along isoflavone treatment was observed. Surprisingly, positive amplification for both tdr and ddr genes was obtained in faecal samples and derived slurry cultures from two non-equol producing women, suggesting the genes could be non-functional or the daidzein metabolized to other compounds in samples from these two women. This novel qPCR tool provides a technique for monitoring gut microbes that produce equol in humans. Monitoring equol-producing bacteria in the human gut could provide a means of evaluating strategies aimed at increasing the endogenous formation of this bioactive compound.
Collapse
Affiliation(s)
- Lucía Vázquez
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSICVillaviciosa, Spain
| | - Lucía Guadamuro
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSICVillaviciosa, Spain
| | - Froilán Giganto
- Servicio Digestivo, Hospital Universitario Central de AsturiasOviedo, Spain
| | - Baltasar Mayo
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSICVillaviciosa, Spain
| | - Ana B Flórez
- Departamento de Microbiología y Bioquímica, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSICVillaviciosa, Spain
| |
Collapse
|
67
|
Barroso E, Muñoz-González I, Jiménez E, Bartolomé B, Moreno-Arribas MV, Peláez C, Del Carmen Martínez-Cuesta M, Requena T. Phylogenetic profile of gut microbiota in healthy adults after moderate intake of red wine. Mol Nutr Food Res 2016; 61. [PMID: 27794201 DOI: 10.1002/mnfr.201600620] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/20/2016] [Accepted: 10/24/2016] [Indexed: 01/22/2023]
Abstract
SCOPE There is growing interest in understanding how human colonic microbiota can be modified by dietary habits. We examined the influence of moderate red wine intake on the colonic microbiota of 15 healthy volunteers, related to the high concentration of polyphenols present in this beverage. The volunteers were classified into high, moderate, and low polyphenol metabolizers (metabotypes) due to their ability to metabolize polyphenols and the results were compared with that of five control (no wine intake) subjects. METHODS AND RESULTS We analyzed the composition, diversity, and dynamics of their fecal microbiota before and after 1 month of wine consumption. The 16S rDNA sequencing allowed detection of 2324 phylotypes, of which only 30 were found over the 0.5% of mean relative frequency, representing 84.6% of the total taxonomical assignments. The samples clustered more strongly by individuals than by wine intake or metabotypes, however an increase in diversity, after the wine intake, was observed. CONCLUSION The results of this study suggest an increase in the global fecal microbial diversity associated to the consumption of red wine, confirm the high variability of the microbiota from different individuals, and show the stability of their singular microbiota composition to small and short-term dietary changes.
Collapse
Affiliation(s)
- Elvira Barroso
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| | - Irene Muñoz-González
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| | - Esther Jiménez
- Departamento de Nutrición, Bromatologı́a y Tecnología de los Alimentos, Universidad Complutense de Madrid, Madrid, Spain.,ProbiSearch, Tres Cantos, Spain
| | - Begoña Bartolomé
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| | - M Victoria Moreno-Arribas
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| | - Carmen Peláez
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| | | | - Teresa Requena
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Madrid, Spain
| |
Collapse
|
68
|
Chalcone Isomerase from Eubacterium ramulus Catalyzes the Ring Contraction of Flavanonols. J Bacteriol 2016; 198:2965-2974. [PMID: 27551015 DOI: 10.1128/jb.00490-16] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 08/05/2016] [Indexed: 01/07/2023] Open
Abstract
The enzyme catalyzing the ring-contracting conversion of the flavanonol taxifolin to the auronol alphitonin in the course of flavonoid degradation by the human intestinal anaerobe Eubacterium ramulus was purified and characterized. It stereospecifically catalyzed the isomerization of (+)-taxifolin but not that of (-)-taxifolin. The Km for (+)-taxifolin was 6.4 ± 0.8 μM, and the Vmax was 108 ± 4 μmol min-1 (mg protein)-1 The enzyme also isomerized (+)-dihydrokaempferol, another flavanonol, to maesopsin. Inspection of the encoding gene revealed its complete identity to that of the gene encoding chalcone isomerase (CHI) from E. ramulus Based on the reported X-ray crystal structure of CHI (M. Gall et al., Angew Chem Int Ed 53:1439-1442, 2014, http://dx.doi.org/10.1002/anie.201306952), docking experiments suggest the substrate binding mode of flavanonols and their stereospecific conversion. Mutation of the active-site histidine (His33) to alanine led to a complete loss of flavanonol isomerization by CHI, which indicates that His33 is also essential for this activity. His33 is proposed to mediate the stereospecific abstraction of a proton from the hydroxymethylene carbon of the flavanonol C-ring followed by ring opening and recyclization. A flavanonol-isomerizing enzyme was also identified in the flavonoid-converting bacterium Flavonifractor plautii based on its 50% sequence identity to the CHI from E. ramulus IMPORTANCE: Chalcone isomerase was known to be involved in flavone/flavanone conversion by the human intestinal bacterium E. ramulus Here we demonstrate that this enzyme moreover catalyzes a key step in the breakdown of flavonols/flavanonols. Thus, a single isomerase plays a dual role in the bacterial conversion of dietary bioactive flavonoids. The identification of a corresponding enzyme in the human intestinal bacterium F. plautii suggests a more widespread occurrence of this isomerase in flavonoid-degrading bacteria.
Collapse
|
69
|
Stevens JF, Maier CS. The Chemistry of Gut Microbial Metabolism of Polyphenols. PHYTOCHEMISTRY REVIEWS : PROCEEDINGS OF THE PHYTOCHEMICAL SOCIETY OF EUROPE 2016; 15:425-444. [PMID: 27274718 PMCID: PMC4888912 DOI: 10.1007/s11101-016-9459-z] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 03/02/2016] [Indexed: 05/18/2023]
Abstract
Gut microbiota contribute to the metabolism of dietary polyphenols and affect the bioavailability of both the parent polyphenols and their metabolites. Although there is a large number of reports of specific polyphenol metabolites, relatively little is known regarding the chemistry and enzymology of the metabolic pathways utilized by specific microbial species and taxa, which is the focus of this review. Major classes of dietary polyphenols include monomeric and oligomeric catechins (proanthocyanidins), flavonols, flavanones, ellagitannins, and isoflavones. Gut microbial metabolism of representatives of these polyphenol classes can be classified as A- and C-ring cleavage (retro Claisen reactions), C-ring cleavage mediated by dioxygenases, dehydroxylations (decarboxylation or reduction reactions followed by release of H2O molecules), and hydrogenations of alkene moieties in polyphenols, such as resveratrol, curcumin, and isoflavones (mediated by NADPH-dependent reductases). The qualitative and quantitative metabolic output of the gut microbiota depends to a large extent on the metabolic capacity of individual taxa, which emphasizes the need for assessment of functional analysis in conjunction with determinations of gut microbiota compositions.
Collapse
Affiliation(s)
- Jan F Stevens
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon 97330; Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97330
| | - Claudia S Maier
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97330; Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97330
| |
Collapse
|
70
|
Cho GS, Ritzmann F, Eckstein M, Huch M, Briviba K, Behsnilian D, Neve H, Franz CMAP. Quantification of Slackia and Eggerthella spp. in Human Feces and Adhesion of Representatives Strains to Caco-2 Cells. Front Microbiol 2016; 7:658. [PMID: 27242689 PMCID: PMC4860493 DOI: 10.3389/fmicb.2016.00658] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 04/20/2016] [Indexed: 12/21/2022] Open
Abstract
Eggerthella and Slackia spp. are gut associated bacteria that have been suggested to play roles in host lipid and xenobiotic metabolism. A quantitative PCR method for the selective enumeration of bacteria belonging to either the genus Eggerthella or Slackia was developed in order to establish the numbers of these bacteria occurring in human feces. The primers developed for selective amplification of these genera were tested first in conventional PCR to test for their specificity. Representative species of Eggerthella and Slackia, as well as closely related genera of the Coriobacteriia, were included in the investigation. The selected primers were shown to be capable of specific amplification of species of the genera Eggerthella and Slackia, but not all species of the genera may be amplified by the respective primers. Their use in qPCR experiments to assess the levels of Slackia equolifaciens and Eggerthella lenta in the feces of 19 human volunteers showed they occurred at mean counts of 7 × 10(5) and 3.1 × 10(5) CFU/g for Eggerthella spp. and Slackia spp., respectively. Electron microscopy investigations showed that while E. lenta cells exhibited slender and very regular shaped rods, Slackia cells showed a remarkably pleomorphic phenotype. Both species did not appear to have fimbriae or pili. Some S. equolifaciens cells showed a characteristic "ribbon" of presumably extracellular material around the cells, particularly at the areas of cell division. The two species also differed markedly in their adhesion behavior to Caco-2 cells in cell culture, as E. lenta DSMZ 15644 showed a high adhesion capacity of 74.2% adherence of the bacterial cells added to Caco-2 cells, while S. equolifaciens DSM 24851(T) on the other hand showed only low adhesion capability, as 6.1% of bacterial cells remained bound. Speculatively, this may imply that the ecological compartments where these bacteria reside in the gut may be different, i.e., E. lenta may be associated more with the gut wall, while Slackia may be free living in the lumen.
Collapse
Affiliation(s)
- Gyu-Sung Cho
- Department of Microbiology and Biotechnology, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Kiel, Germany
| | - Felix Ritzmann
- Department of Safety and Quality of Fruit and Vegetables, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Karlsruhe, Germany
| | - Marie Eckstein
- Department of Safety and Quality of Fruit and Vegetables, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Karlsruhe, Germany
| | - Melanie Huch
- Department of Safety and Quality of Fruit and Vegetables, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Karlsruhe, Germany
| | - Karlis Briviba
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Karlsruhe, Germany
| | - Diana Behsnilian
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Karlsruhe, Germany
| | - Horst Neve
- Department of Microbiology and Biotechnology, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Kiel, Germany
| | - Charles M A P Franz
- Department of Microbiology and Biotechnology, Max Rubner-Institut, Federal Research Institute of Nutrition and Food Kiel, Germany
| |
Collapse
|
71
|
Braune A, Blaut M. Bacterial species involved in the conversion of dietary flavonoids in the human gut. Gut Microbes 2016; 7:216-34. [PMID: 26963713 PMCID: PMC4939924 DOI: 10.1080/19490976.2016.1158395] [Citation(s) in RCA: 292] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 02/19/2016] [Indexed: 02/03/2023] Open
Abstract
The gut microbiota plays a crucial role in the conversion of dietary flavonoids and thereby affects their health-promoting effects in the human host. The identification of the bacteria involved in intestinal flavonoid conversion has gained increasing interest. This review summarizes available information on the so far identified human intestinal flavonoid-converting bacterial species and strains as well as their enzymes catalyzing the underlying reactions. The majority of described species involved in flavonoid transformation are capable of carrying out the O-deglycosylation of flavonoids. Other bacteria cleave the less common flavonoid-C-glucosides and/or further degrade the aglycones of flavonols, flavanonols, flavones, flavanones, dihydrochalcones, isoflavones and monomeric flavan-3-ols. To increase the currently limited knowledge in this field, identification of flavonoid-converting bacteria should be continued using culture-dependent screening or isolation procedures and molecular approaches based on sequence information of the involved enzymes.
Collapse
Affiliation(s)
- Annett Braune
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Michael Blaut
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| |
Collapse
|
72
|
Kawada Y, Yokoyama S, Yanase E, Niwa T, Suzuki T. The production of S-equol from daidzein is associated with a cluster of three genes in Eggerthella sp. YY7918. BIOSCIENCE OF MICROBIOTA FOOD AND HEALTH 2016; 35:113-21. [PMID: 27508112 PMCID: PMC4965515 DOI: 10.12938/bmfh.2015-023] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 03/02/2016] [Indexed: 01/28/2023]
Abstract
Daidzein (DZN) is converted to equol (EQL) by intestinal bacteria. We previously reported that
Eggerthella sp. YY7918, which is found in human feces, is an EQL-producing bacterium and
analyzed its whole genomic sequence. We found three coding sequences (CDSs) in this bacterium that showed 99%
similarity to the EQL-producing enzymes of Lactococcus sp. 20-92. These identified CDSs were
designated eqlA, eqlB, and eqlC and thought to encode
daidzein reductase (DZNR), dihydrodaidzein reductase (DHDR), and tetrahydrodaidzein reductase (THDR),
respectively. These genes were cloned into pColdII. Recombinant plasmids were then introduced into
Escherichia coli BL21 (DE3) and DZNR, DHDR, and THDR were expressed and purified by
6×His-Tag chromatography. We confirmed that these three enzymes were involved in the conversion of DZN to EQL.
Purified DZNR converted DZN to dihydrodaizein (DHD) in the presence of NADPH. DHDR converted DHD to
tetrahydrodaizein (THD) in the presence of NADPH. Neither enzyme showed activities with NADH. THDR converted
THD in the absence of cofactors, NAD(P)H, and also produced DHD as a by-product. Thus, we propose that THDR is
not a reductase but a new type of dismutase. The GC content of these clusters was 64%, similar to the overall
genomic GC content for Eggerthella and Coriobacteriaceae (56–60%), and higher than that for
Lactococcus garvieae (39%), even though the gene cluster showed 99% similarity to that in
Lactococcus sp. 20-92. Taken together, our results indicate that the gene cluster
associated with EQL production evolved in high-GC bacteria including Coriobacteriaceae and was then laterally
transferred to Lactococcus sp. 20-92.
Collapse
Affiliation(s)
- Yuika Kawada
- The United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Shinichiro Yokoyama
- Department of Food Technology, Industrial Technology Center, Gifu Prefectural Government, 47 Kitaoyobi, Kasamatsu, Hashima, Gifu 501-6064, Japan
| | - Emiko Yanase
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Toshio Niwa
- Faculty of Health and Nutrition, Shubun University, 6 Nikko-cho, Ichinomiya, Aichi 491-0938, Japan
| | - Tohru Suzuki
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| |
Collapse
|
73
|
P212A Mutant of Dihydrodaidzein Reductase Enhances (S)-Equol Production and Enantioselectivity in a Recombinant Escherichia coli Whole-Cell Reaction System. Appl Environ Microbiol 2016; 82:1992-2002. [PMID: 26801575 DOI: 10.1128/aem.03584-15] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 01/07/2016] [Indexed: 01/28/2023] Open
Abstract
(S)-Equol, a gut bacterial isoflavone derivative, has drawn great attention because of its potent use for relieving female postmenopausal symptoms and preventing prostate cancer. Previous studies have reported on the dietary isoflavone metabolism of several human gut bacteria and the involved enzymes for conversion of daidzein to (S)-equol. However, the anaerobic growth conditions required by the gut bacteria and the low productivity and yield of (S)-equol limit its efficient production using only natural gut bacteria. In this study, the low (S)-equol biosynthesis of gut microorganisms was overcome by cloning the four enzymes involved in the biosynthesis from Slackia isoflavoniconvertens into Escherichia coli BL21(DE3). The reaction conditions were optimized for (S)-equol production from the recombinant strain, and this recombinant system enabled the efficient conversion of 200 μM and 1 mM daidzein to (S)-equol under aerobic conditions, achieving yields of 95% and 85%, respectively. Since the biosynthesis of trans-tetrahydrodaidzein was found to be a rate-determining step for (S)-equol production, dihydrodaidzein reductase (DHDR) was subjected to rational site-directed mutagenesis. The introduction of the DHDR P212A mutation increased the (S)-equol productivity from 59.0 mg/liter/h to 69.8 mg/liter/h in the whole-cell reaction. The P212A mutation caused an increase in the (S)-dihydrodaidzein enantioselectivity by decreasing the overall activity of DHDR, resulting in undetectable activity for (R)-dihydrodaidzein, such that a combination of the DHDR P212A mutant with dihydrodaidzein racemase enabled the production of (3S,4R)-tetrahydrodaidzein with an enantioselectivity of >99%.
Collapse
|
74
|
Braune A, Engst W, Blaut M. Identification and functional expression of genes encoding flavonoid O- and C-glycosidases in intestinal bacteria. Environ Microbiol 2015; 18:2117-29. [PMID: 25845411 DOI: 10.1111/1462-2920.12864] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/26/2015] [Accepted: 03/31/2015] [Indexed: 11/29/2022]
Abstract
Gut bacteria play a crucial role in the metabolism of dietary flavonoids and thereby influence the bioactivity of these compounds in the host. The intestinal Lachnospiraceae strain CG19-1 and Eubacterium cellulosolvens are able to deglycosylate C- and O-coupled flavonoid glucosides. Growth of strain CG19-1 in the presence of the isoflavone C-glucoside puerarin (daidzein 8-C-glucoside) led to the induction of two proteins (DfgC, DfgD). Heterologous expression of the encoding genes (dfgC, dfgD) in Escherichia coli revealed no C-deglycosylating activity in the resulting cell extracts but cleavage of flavonoid O-glucosides such as daidzin (daidzein 7-O-glucoside). The recombinant DfgC and DfgD proteins were purified and characterized with respect to their quaternary structure, substrate and cofactor specificity. The products of the corresponding genes (dfgC, dfgD) from E. cellulosolvens also catalysed the O-deglycosylation of daidzin following their expression in E. coli. In combination with three recombinant proteins encoded by adjacent genes in E. cellulosolvens (dfgA, dfgB, dfgE), DfgC and DfgD from E. cellulosolvens catalysed the deglycosylation of the flavone C-glucosides homoorientin (luteolin 6-C-glucoside) and isovitexin (apigenin 6-C-glucoside). Even intact cells of E. coli expressing the five E. cellulosolvens genes cleaved these flavone C-glucosides and, also, flavonoid O-glucosides to the corresponding aglycones.
Collapse
Affiliation(s)
- Annett Braune
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, Nuthetal, D-14558, Germany
| | - Wolfram Engst
- Analytics Group, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, Nuthetal, D-14558, Germany
| | - Michael Blaut
- Department of Gastrointestinal Microbiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, Nuthetal, D-14558, Germany
| |
Collapse
|
75
|
Trantas EA, Koffas MAG, Xu P, Ververidis F. When plants produce not enough or at all: metabolic engineering of flavonoids in microbial hosts. FRONTIERS IN PLANT SCIENCE 2015; 6:7. [PMID: 25688249 PMCID: PMC4310283 DOI: 10.3389/fpls.2015.00007] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Accepted: 01/06/2015] [Indexed: 05/30/2023]
Abstract
As a result of the discovery that flavonoids are directly or indirectly connected to health, flavonoid metabolism and its fascinating molecules that are natural products in plants, have attracted the attention of both the industry and researchers involved in plant science, nutrition, bio/chemistry, chemical bioengineering, pharmacy, medicine, etc. Subsequently, in the past few years, flavonoids became a top story in the pharmaceutical industry, which is continually seeking novel ways to produce safe and efficient drugs. Microbial cell cultures can act as workhorse bio-factories by offering their metabolic machinery for the purpose of optimizing the conditions and increasing the productivity of a selective flavonoid. Furthermore, metabolic engineering methodology is used to reinforce what nature does best by correcting the inadequacies and dead-ends of a metabolic pathway. Combinatorial biosynthesis techniques led to the discovery of novel ways of producing natural and even unnatural plant flavonoids, while, in addition, metabolic engineering provided the industry with the opportunity to invest in synthetic biology in order to overcome the currently existing restricted diversification and productivity issues in synthetic chemistry protocols. In this review, is presented an update on the rationalized approaches to the production of natural or unnatural flavonoids through biotechnology, analyzing the significance of combinatorial biosynthesis of agricultural/pharmaceutical compounds produced in heterologous organisms. Also mentioned are strategies and achievements that have so far thrived in the area of synthetic biology, with an emphasis on metabolic engineering targeting the cellular optimization of microorganisms and plants that produce flavonoids, while stressing the advances in flux dynamic control and optimization. Finally, the involvement of the rapidly increasing numbers of assembled genomes that contribute to the gene- or pathway-mining in order to identify the gene(s) responsible for producing species-specific secondary metabolites is also considered herein.
Collapse
Affiliation(s)
- Emmanouil A. Trantas
- Plant Biochemistry and Biotechnology Laboratory, Department of Agriculture, School of Agriculture and Food Technology, Technological and Educational Institute of CreteHeraklion, Greece
| | - Mattheos A. G. Koffas
- Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic InstituteTroy, NY, USA
| | - Peng Xu
- Department of Chemical Engineering, Massachusetts Institute of Technology CambridgeMA, USA
| | - Filippos Ververidis
- Plant Biochemistry and Biotechnology Laboratory, Department of Agriculture, School of Agriculture and Food Technology, Technological and Educational Institute of CreteHeraklion, Greece
| |
Collapse
|
76
|
The role of colonic bacteria in the metabolism of the natural isoflavone daidzin to equol. Metabolites 2015; 5:56-73. [PMID: 25594250 PMCID: PMC4381290 DOI: 10.3390/metabo5010056] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 01/07/2015] [Indexed: 12/18/2022] Open
Abstract
Isoflavones are found in leguminous plants, especially soybeans. They have a structural similarity to natural estrogens, which enables them to bind to estrogen receptors and elicit biological activities similar to natural estrogens. They have been suggested to be beneficial for the prevention and therapy of hormone-dependent diseases. After soy products are consumed, the bacteria of the intestinal microflora metabolize isoflavones to metabolites with altered absorption, bioavailability, and estrogenic characteristics. Variations in the effect of soy products have been correlated with the isoflavone metabolites found in plasma and urine samples of the individuals consuming soy products. The beneficial effects of the soy isoflavone daidzin, the glycoside of daidzein, have been reported in individuals producing equol, a reduction product of daidzein produced by specific colonic bacteria in individuals called equol producers. These individuals comprise 30% and 60% of populations consuming Western and soy-rich Asian diets, respectively. Since the higher percentage of equol producers in populations consuming soy-rich diets is correlated with a lower incidence of hormone-dependent diseases, considerable efforts have been made to detect the specific colonic bacteria involved in the metabolism of daidzein to the more estrogenic compound, equol, which should facilitate the investigation of the metabolic activities related to this compound.
Collapse
|
77
|
Bircsak KM, Aleksunes LM. Interaction of Isoflavones with the BCRP/ABCG2 Drug Transporter. Curr Drug Metab 2015; 16:124-40. [PMID: 26179608 PMCID: PMC4713194 DOI: 10.2174/138920021602150713114921] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 03/03/2015] [Accepted: 04/08/2015] [Indexed: 12/15/2022]
Abstract
This review will provide a comprehensive overview of the interactions between dietary isoflavones and the ATP-binding cassette (ABC) G2 efflux transporter, which is also named the breast cancer resistance protein (BCRP). Expressed in a variety of organs including the liver, kidneys, intestine, and placenta, BCRP mediates the disposition and excretion of numerous endogenous chemicals and xenobiotics. Isoflavones are a class of naturallyoccurring compounds that are found at high concentrations in commonly consumed foods and dietary supplements. A number of isoflavones, including genistein and daidzein and their metabolites, interact with BCRP as substrates, inhibitors, and/or modulators of gene expression. To date, a variety of model systems have been employed to study the ability of isoflavones to serve as substrates and inhibitors of BCRP; these include whole cells, inverted plasma membrane vesicles, in situ organ perfusion, as well as in vivo rodent and sheep models. Evidence suggests that BCRP plays a role in mediating the disposition of isoflavones and in particular, their conjugated forms. Furthermore, as inhibitors, these compounds may aid in reversing multidrug resistance and sensitizing cancer cells to chemotherapeutic drugs. This review will also highlight the consequences of altered BCRP expression and/or function on the pharmacokinetics and toxicity of chemicals following isoflavone exposure.
Collapse
Affiliation(s)
| | - Lauren M Aleksunes
- Dept. of Pharmacology and Toxicology, Rutgers University, 170 Frelinghuysen Rd. Piscataway, NJ 08854, USA.
| |
Collapse
|
78
|
Chiou YS, Wu JC, Huang Q, Shahidi F, Wang YJ, Ho CT, Pan MH. Metabolic and colonic microbiota transformation may enhance the bioactivities of dietary polyphenols. J Funct Foods 2014. [DOI: 10.1016/j.jff.2013.08.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
79
|
Virk-Baker MK, Barnes S, Krontiras H, Nagy TR. S-(-)equol producing status not associated with breast cancer risk among low isoflavone-consuming US postmenopausal women undergoing a physician-recommended breast biopsy. Nutr Res 2014; 34:116-25. [PMID: 24461312 PMCID: PMC4028846 DOI: 10.1016/j.nutres.2013.12.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 12/09/2013] [Accepted: 12/11/2013] [Indexed: 12/31/2022]
Abstract
Soy foods are the richest sources of isoflavones, mainly daidzein and genistein. Soy isoflavones are structurally similar to the steroid hormone 17β-estradiol and may protect against breast cancer. S-(-)equol, a metabolite of the soy isoflavone daidzein, has a higher bioavailability and greater affinity for estrogen receptor β than daidzein. Approximately one-third of the Western population is able to produce S-(-)equol, and the ability is linked to certain gut microbes. We hypothesized that the prevalence of breast cancer, ductal hyperplasia, and overall breast pathology will be lower among S-(-)equol producing, as compared with nonproducing, postmenopausal women undergoing a breast biopsy. We tested our hypothesis using a cross-sectional study design. Usual diets of the participants were supplemented with 1 soy bar per day for 3 consecutive days. Liquid chromatography-multiple reaction ion monitoring mass spectrometry analysis of urine from 143 subjects revealed 25 (17.5%) as S-(-)equol producers. We found no statistically significant associations between S-(-)equol producing status and overall breast pathology (odds ratio [OR], 0.68; 95% confidence interval [CI], 0.23-1.89), ductal hyperplasia (OR, 0.84; 95% CI, 0.20-3.41), or breast cancer (OR, 0.56; 95% CI, 0.16-1.87). However, the mean dietary isoflavone intake was much lower (0.3 mg/d) than in previous reports. Given that the amount of S-(-)equol produced in the gut depends on the amount of daidzein exposure, the low soy intake coupled with lower prevalence of S-(-)equol producing status in the study population favors toward null associations. Findings from our study could be used for further investigations on S-(-)equol producing status and disease risk.
Collapse
Affiliation(s)
- Mandeep K Virk-Baker
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Stephen Barnes
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL, USA; The UAB Comprehensive Cancer Center, Birmingham, AL, USA.
| | - Helen Krontiras
- The UAB Comprehensive Cancer Center, Birmingham, AL, USA; Department of Surgery, Surgical Oncology, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Tim R Nagy
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA; The UAB Comprehensive Cancer Center, Birmingham, AL, USA.
| |
Collapse
|