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Growth behavior of probiotic microorganisms on levan- and inulin-based fructans. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Bizzarri M, Delledonne M, Ferrarini A, Tononi P, Zago E, Vittori D, Damiani F, Paolocci F. Whole-Transcriptome Analysis Unveils the Synchronized Activities of Genes for Fructans in Developing Tubers of the Jerusalem Artichoke. FRONTIERS IN PLANT SCIENCE 2020; 11:101. [PMID: 32153609 PMCID: PMC7046554 DOI: 10.3389/fpls.2020.00101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 01/23/2020] [Indexed: 05/04/2023]
Abstract
Helianthus tuberosus L., known as the Jerusalem artichoke, is a hexaploid plant species, adapted to low-nutrient soils, that accumulates high levels of inulin in its tubers. Inulin is a fructose-based polysaccharide used either as dietary fiber or for the production of bioethanol. Key enzymes involved in inulin biosynthesis are well known. However, the gene networks underpinning tuber development and inulin accumulation in H. tuberous remain elusive. To fill this gap, we selected 6,365 expressed sequence tags (ESTs) from an H. tuberosus library to set up a microarray platform and record their expression across three tuber developmental stages, when rhizomes start enlarging (T0), at maximum tuber elongation rate (T3), and at tuber physiological maturity (Tm), in "VR" and "K8-HS142"clones. The former was selected as an early tuberizing and the latter as a late-tuberizing clone. We quantified inulin and starch levels, and qRT-PCR confirmed the expression of critical genes accounting for inulin biosynthesis. The microarray analysis revealed that the differences in morphological and physiological traits between tubers of the two clones are genetically determined since T0 and that is relatively low the number of differentially expressed ESTs across the stages shared between the clones (93). The expression of ESTs for sucrose:sucrose 1-fructosyltransferase (1-SST) and fructan:fructan 1-fructosyltransferase (1-FFT), the two critical genes for fructans polymerization, resulted to be temporarily synchronized and mirror the progress of inulin accumulation and stretching. The expression of ESTs for starch biosynthesis was insignificant throughout the developmental stages of the clones in line with the negligible level of starch into their mature tubers, where inulin was the dominant polysaccharide. Overall, our study disclosed candidate genes underpinning the development and storage of carbohydrates in the tubers of two H. tuberosus clones. A model according to which the steady-state levels of 1-SST and 1-FFT transcripts are developmentally controlled and might represent a limiting factor for inulin accumulation has been provided. Our finding may have significant repercussions for breeding clones with improved levels of inulin for food and chemical industry.
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Affiliation(s)
- Marco Bizzarri
- Department of Science and Technology for Agriculture, Forests, Nature and Energy (DAFNE), University of Tuscia, Viterbo, Italy
| | | | | | - Paola Tononi
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Elisa Zago
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Doriano Vittori
- Department of Science and Technology for Agriculture, Forests, Nature and Energy (DAFNE), University of Tuscia, Viterbo, Italy
| | - Francesco Damiani
- Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Perugia, Italy
| | - Francesco Paolocci
- Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Perugia, Italy
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Liu C, Kolida S, Charalampopoulos D, Rastall RA. An evaluation of the prebiotic potential of microbial levans from Erwinia sp. 10119. J Funct Foods 2020. [DOI: 10.1016/j.jff.2019.103668] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Hull CM, Warrilow AGS, Rolley NJ, Price CL, Donnison IS, Kelly DE, Kelly SL. Co-production of 11α-hydroxyprogesterone and ethanol using recombinant yeast expressing fungal steroid hydroxylases. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:226. [PMID: 29021826 PMCID: PMC5622474 DOI: 10.1186/s13068-017-0904-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/07/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Bioethanol production from sustainable sources of biomass that limit effect on food production are needed and in a biorefinery approach co-products are desirable, obtained from both the plant material and from the microbial biomass. Fungal biotransformation of steroids was among the first industrial biotransformations allowing corticosteroid production. In this work, the potential of yeast to produce intermediates needed in corticosteroid production is demonstrated at laboratory scale following bioethanol production from perennial ryegrass juice. RESULTS Genes encoding the 11α-steroid hydroxylase enzymes from Aspergillus ochraceus (11α-SHAoch) and Rhizopus oryzae (CYP509C12) transformed into Saccharomyces cerevisiae for heterologous constitutive expression in p425TEF. Both recombinant yeasts (AH22:p11α-SHAoch and AH22:p509C12) exhibited efficient progesterone bioconversion (on glucose minimal medial containing 300 µM progesterone) producing either 11α-hydroxyprogesterone as the sole metabolite (AH22:p11α-SHAoch) or a 7:1 mixture of 11α-hydroxyprogesterone and 6β-hydroxyprogesterone (AH22:p509C12). Ethanol yields for AH22:p11α-SHAoch and AH22:p509C12 were comparable resulting in ≥75% conversion of glucose to alcohol. Co-production of bioethanol together with efficient production of the 11-OH intermediate for corticosteroid manufacture was then demonstrated using perennial ryegrass juice. Integration of the 11α-SHAoch gene into the yeast genome (AH22:11α-SHAoch+K) resulted in a 36% reduction in yield of 11α-hydroxyprogesterone to 174 µmol/L using 300 µM progesterone. However, increasing progesterone concentration to 955 µM and optimizing growth conditions increased 11α-hydroxyprogesterone production to 592 µmol/L product formed. CONCLUSIONS The progesterone 11α-steroid hydroxylases from A. ochraceus and R. oryzae, both monooxygenase enzymes of the cytochrome P450 superfamily, have been functionally expressed in S. cerevisiae. It appears that these activities in fungi are not associated with a conserved family of cytochromes P450. The activity of the A. ochraceous enzyme was important as the specificity of the biotransformation yielded just the 11-OH product needed for corticosteroid production. The data presented demonstrate how recombinant yeast could find application in rural biorefinery processes where co-production of value-added products (11α-hydroxyprogesterone and ethanol) from novel feedstocks is an emergent and attractive possibility.
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Affiliation(s)
- Claire M. Hull
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
| | - Andrew G. S. Warrilow
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
| | - Nicola J. Rolley
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
| | - Claire L. Price
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
| | - Iain S. Donnison
- Institute of Biological, Environmental & Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Wales SY23 3EE UK
| | - Diane E. Kelly
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
| | - Steven L. Kelly
- Institute of Life Science, Swansea University Medical School, Swansea, SA2 8PP Wales UK
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The cell wall anchored β-fructosidases of Lactobacillus paracasei : Overproduction, purification, and gene expression control. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.10.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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Mendoza-Llerenas EO, Pérez DJ, Gómez-Sandoval Z, Escalante-Minakata P, Ibarra-Junquera V, Razo-Hernández RS, Capozzi V, Russo P, Spano G, Fiocco D, Osuna-Castro JA, Moreno A. Lactobacillus plantarum WCFS1 β-Fructosidase: Evidence for an Open Funnel-Like Channel Through the Catalytic Domain with Importance for the Substrate Selectivity. Appl Biochem Biotechnol 2016; 180:1056-1075. [PMID: 27295039 DOI: 10.1007/s12010-016-2152-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
Abstract
β-Fructosidase, a glycoside hydrolase of a biotechnologically important strain, was studied for its biochemical, physicochemical, and three-dimensional structure characteristics. This enzyme was heterologously expressed in Escherichia coli as a C-terminal His-tagged protein (SacB). β-Fructosidase catalyzes the cleavage of glycoside bonds toward certain carbohydrates with β-fructofuranosyl linkages; however, SacB exhibited selectivity toward sucrose and an optimum activity at pH 6.0-6.5 and 37 °C. In such optimum enzymatic activity conditions, the SacB was commonly observed as a monodisperse protein by dynamic light scattering (DLS). As β-fructosidase belongs to glycoside hydrolase family 32 (GH32), a β-sandwich and a five-bladed β-propeller domain are typical predicted folds in its structure. Docking and molecular dynamic simulations revealed for the first time a funnel-like channel perfectly exposed in the β-propeller domain of the Lactobacillus plantarum β-fructosidase (this allows the interaction between its entire catalytic triad and substrates that are larger than sucrose). In contrast, SacB showed a closed central tunnel collaterally induced by its His-tag.
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Affiliation(s)
- Edgar Omar Mendoza-Llerenas
- Facultad de Ciencias Químicas, Universidad de Colima, Carr. Colima-Coquimatlán, km 9, Coquimatlán, Colima, México, C.P. 28400
| | - David Javier Pérez
- Facultad de Ciencias Químicas, Universidad de Colima, Carr. Colima-Coquimatlán, km 9, Coquimatlán, Colima, México, C.P. 28400
| | - Zeferino Gómez-Sandoval
- Facultad de Ciencias Químicas, Universidad de Colima, Carr. Colima-Coquimatlán, km 9, Coquimatlán, Colima, México, C.P. 28400
| | - Pilar Escalante-Minakata
- Laboratorio de Bioingeniería, Universidad de Colima, Carr. Colima-Coquimatlán, km 9, Coquimatlán, Colima, México, C.P. 28400
| | - Vrani Ibarra-Junquera
- Laboratorio de Bioingeniería, Universidad de Colima, Carr. Colima-Coquimatlán, km 9, Coquimatlán, Colima, México, C.P. 28400
| | - Rodrigo Said Razo-Hernández
- Laboratorio de Dinámica de Proteínas y Ácidos Nucleicos, Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México, C.P. 62209
| | - Vittorio Capozzi
- Dipartimento di Scienze degli Alimenti, Facoltà di Agraria, Università degli Studi di Foggia, via Napoli 25, Foggia, Italy, C.P. 71122
| | - Pasquale Russo
- Dipartimento di Scienze degli Alimenti, Facoltà di Agraria, Università degli Studi di Foggia, via Napoli 25, Foggia, Italy, C.P. 71122
| | - Giuseppe Spano
- Dipartimento di Scienze degli Alimenti, Facoltà di Agraria, Università degli Studi di Foggia, via Napoli 25, Foggia, Italy, C.P. 71122
| | - Daniela Fiocco
- Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi di Foggia, viale Luigi Pinto 1, Foggia, Italy, C.P. 71100
| | - Juan Alberto Osuna-Castro
- Facultad de Ciencias Biológicas y Agropecuarias, Universidad de Colima, Autopista Colima-Manzanillo, km 40, Tecomán, Colima, México, C.P. 28100.
| | - Abel Moreno
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito exterior Ciudad Universitaria, Ciudad de Mexico, 04510, México.
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Donnison IS, Fraser MD. Diversification and use of bioenergy to maintain future grasslands. Food Energy Secur 2016; 5:67-75. [PMID: 27610234 PMCID: PMC4998134 DOI: 10.1002/fes3.75] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 11/26/2015] [Accepted: 12/02/2015] [Indexed: 11/06/2022] Open
Abstract
Grassland agriculture is experiencing a number of threats including declining profitability and loss of area to other land uses including expansion of the built environment as well as from cropland and forestry. The use of grassland as a natural resource either in terms of existing vegetation and land cover or planting of new species for bioenergy and other nonfood applications presents an opportunity, and potential solution, to maintain the broader ecosystem services that perennial grasslands provide as well as to improve the options for grassland farmers and their communities. This paper brings together different grass or grassland-based studies and considers them as part of a continuum of strategies that, when also combined with improvements in grassland production systems, will improve the overall efficiency of grasslands as an important natural resource and enable a greater area to be managed, replanted or conserved. These diversification options relate to those most likely to be available to farmers and land owners in the marginally economic or uneconomic grasslands of middle to northern Europe and specifically in the UK. Grasslands represent the predominant global land use and so these strategies are likely to be relevant to other areas although the grass species used may vary. The options covered include the use of biomass derived from the management of grasses in the urban and semi urban environment, semi-natural grassland systems as part of ecosystem management, pasture in addition to livestock production, and the planting and cropping of dedicated energy grasses. The adoption of such approaches would not only increase income from economically marginal grasslands, but would also mitigate greenhouse gas emissions from livestock production and help fund conservation of these valuable grassland ecosystems and landscapes, which is increasingly becoming a challenge.
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Affiliation(s)
- Iain S. Donnison
- Institute of Biological, Environmental & Rural SciencesAberystwyth UniversityGogerddan CampusAberystwythSY23 3EEUK
| | - Mariecia D. Fraser
- Institute of Biological, Environmental & Rural SciencesAberystwyth UniversityGogerddan CampusAberystwythSY23 3EEUK
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Kasperowicz A, Stan-Głasek K, Taciak M, Michałowski T. The fructanolytic abilities of the rumen bacterium Butyrivibrio fibrisolvens
strain 3071. J Appl Microbiol 2015; 120:29-40. [DOI: 10.1111/jam.12976] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 09/30/2015] [Accepted: 10/08/2015] [Indexed: 11/27/2022]
Affiliation(s)
- A. Kasperowicz
- The Kielanowski Institute of Animal Physiology and Nutrition; Polish Academy of Sciences; Jabłonna Poland
| | - K. Stan-Głasek
- The Kielanowski Institute of Animal Physiology and Nutrition; Polish Academy of Sciences; Jabłonna Poland
| | - M. Taciak
- The Kielanowski Institute of Animal Physiology and Nutrition; Polish Academy of Sciences; Jabłonna Poland
| | - T. Michałowski
- The Kielanowski Institute of Animal Physiology and Nutrition; Polish Academy of Sciences; Jabłonna Poland
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Levan Enhances Associated Growth of Bacteroides, Escherichia, Streptococcus and Faecalibacterium in Fecal Microbiota. PLoS One 2015; 10:e0144042. [PMID: 26629816 PMCID: PMC4667893 DOI: 10.1371/journal.pone.0144042] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Accepted: 11/12/2015] [Indexed: 12/28/2022] Open
Abstract
The role of dietary fiber in supporting healthy gut microbiota and overall well-being of the host has been revealed in several studies. Here, we show the effect of a bacterial polyfructan levan on the growth dynamics and metabolism of fecal microbiota in vitro by using isothermal microcalorimetry. Eleven fecal samples from healthy donors were incubated in phosphate-buffered defined medium with or without levan supplementation and varying presence of amino acids. The generation of heat, changes in pH and microbiota composition, concentrations of produced and consumed metabolites during the growth were determined. The composition of fecal microbiota and profile of metabolites changed in response to substrate (levan and amino acids) availability. The main products of levan metabolism were acetic, lactic, butyric, propionic and succinic acids and carbon dioxide. Associated growth of levan-degrading (e.g. Bacteroides) and butyric acid-producing (e.g. Faecalibacterium) taxa was observed in levan-supplemented media. The study shows that the capacity of levan and possibly also other dietary fibers/prebiotics to modulate the composition and function of colon microbiota can be predicted by using isothermal microcalorimetry of fecal samples linked to metabolite and consortia analyses.
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10
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Hull CM, Loveridge EJ, Donnison IS, Kelly DE, Kelly SL. Co-production of bioethanol and probiotic yeast biomass from agricultural feedstock: application of the rural biorefinery concept. AMB Express 2014; 4:64. [PMID: 25401067 PMCID: PMC4230830 DOI: 10.1186/s13568-014-0064-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 08/04/2014] [Indexed: 11/18/2022] Open
Abstract
Microbial biotechnology and biotransformations promise to diversify the scope of the biorefinery approach for the production of high-value products and biofuels from industrial, rural and municipal waste feedstocks. In addition to bio-based chemicals and metabolites, microbial biomass itself constitutes an obvious but overlooked by-product of existing biofermentation systems which warrants fuller attention. The probiotic yeast Saccharomyces boulardii is used to treat gastrointestinal disorders and marketed as a human health supplement. Despite its relatedness to S. cerevisiae that is employed widely in biotechnology, food and biofuel industries, the alternative applications of S. boulardii are not well studied. Using a biorefinery approach, we compared the bioethanol and biomass yields attainable from agriculturally-sourced grass juice using probiotic S. boulardii (strain MYA-769) and a commercial S. cerevisiae brewing strain (Turbo yeast). Maximum product yields for MYA-769 (39.18 [±2.42] mg ethanol mL−1 and 4.96 [±0.15] g dry weight L−1) compared closely to those of Turbo (37.43 [±1.99] mg mL−1 and 4.78 [±0.10] g L−1, respectively). Co-production, marketing and/or on-site utilisation of probiotic yeast biomass as a direct-fed microbial to improve livestock health represents a novel and viable prospect for rural biorefineries. Given emergent evidence to suggest that dietary yeast supplementations might also mitigate ruminant enteric methane emissions, the administration of probiotic yeast biomass could also offer an economically feasible way of reducing atmospheric CH4.
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Chen C, Zhou F, Ren J, Ai L, Dong Y, Wu Z, Liu Z, Chen W, Guo B. Cloning, expression and functional validation of a β-fructofuranosidase from Lactobacillus plantarum. Process Biochem 2014. [DOI: 10.1016/j.procbio.2014.02.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Porras-Domínguez JR, Ávila-Fernández Á, Rodríguez-Alegría ME, Miranda-Molina A, Escalante A, González-Cervantes R, Olvera C, López Munguía A. Levan-type FOS production using a Bacillus licheniformis endolevanase. Process Biochem 2014. [DOI: 10.1016/j.procbio.2014.02.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Hull CM, Loveridge EJ, Rolley NJ, Donnison IS, Kelly SL, Kelly DE. Co-production of ethanol and squalene using a Saccharomyces cerevisiae ERG1 (squalene epoxidase) mutant and agro-industrial feedstock. BIOTECHNOLOGY FOR BIOFUELS 2014; 7:133. [PMID: 25298782 PMCID: PMC4189534 DOI: 10.1186/s13068-014-0133-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 08/29/2014] [Indexed: 05/23/2023]
Abstract
BACKGROUND Genetically customised Saccharomyces cerevisiae that can produce ethanol and additional bio-based chemicals from sustainable agro-industrial feedstocks (for example, residual plant biomass) are of major interest to the biofuel industry. We investigated the microbial biorefinery concept of ethanol and squalene co-production using S. cerevisiae (strain YUG37-ERG1) wherein ERG1 (squalene epoxidase) transcription is under the control of a doxycycline-repressible tet0 7 -CYC1 promoter. The production of ethanol and squalene by YUG37-ERG1 grown using agriculturally sourced grass juice supplemented with doxycycline was assessed. RESULTS Use of the tet0 7 -CYC1 promoter permitted regulation of ERG1 expression and squalene accumulation in YUG37-ERG1, allowing us to circumvent the lethal growth phenotype seen when ERG1 is disrupted completely. In experiments using grass juice feedstock supplemented with 0 to 50 μg doxycycline mL(-1), YUG37-ERG1 fermented ethanol (22.5 [±0.5] mg mL(-1)) and accumulated the highest squalene content (7.89 ± 0.25 mg g(-1) dry biomass) and yield (18.0 ± 4.18 mg squalene L(-1)) with supplements of 5.0 and 0.025 μg doxycycline mL(-1), respectively. Grass juice was found to be rich in water-soluble carbohydrates (61.1 [±3.6] mg sugars mL(-1)) and provided excellent feedstock for growth and fermentation studies using YUG37-ERG1. CONCLUSION Residual plant biomass components from crop production and rotation systems represent possible substrates for microbial fermentation of biofuels and bio-based compounds. This study is the first to utilise S. cerevisiae for the co-production of ethanol and squalene from grass juice. Our findings underscore the value of the biorefinery approach and demonstrate the potential to integrate microbial bioprocess engineering with existing agriculture.
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Affiliation(s)
- Claire M Hull
- />Institute of Life Science, College of Medicine, Swansea University, Swansea, Wales SA2 8PP UK
| | - E Joel Loveridge
- />School of Chemistry, Cardiff University, Cardiff, Wales CF10 3AT UK
| | - Nicola J Rolley
- />Institute of Life Science, College of Medicine, Swansea University, Swansea, Wales SA2 8PP UK
| | - Iain S Donnison
- />Institute of Biological, Environmental & Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Wales SY23 3EE UK
| | - Steven L Kelly
- />Institute of Life Science, College of Medicine, Swansea University, Swansea, Wales SA2 8PP UK
| | - Diane E Kelly
- />Institute of Life Science, College of Medicine, Swansea University, Swansea, Wales SA2 8PP UK
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Choi HY, Ryu HK, Park KM, Lee EG, Lee H, Kim SW, Choi ES. Direct lactic acid fermentation of Jerusalem artichoke tuber extract using Lactobacillus paracasei without acidic or enzymatic inulin hydrolysis. BIORESOURCE TECHNOLOGY 2012; 114:745-747. [PMID: 22516247 DOI: 10.1016/j.biortech.2012.03.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 03/23/2012] [Accepted: 03/24/2012] [Indexed: 05/31/2023]
Abstract
Lactic acid fermentation of Jerusalem artichoke tuber was performed with strains of Lactobacillus paracasei without acidic or enzymatic inulin hydrolysis prior to fermentation. Some strains of L. paracasei, notably KCTC13090 and KCTC13169, could ferment hot-water extract of Jerusalem artichoke tuber more efficiently compared with other Lactobacillus spp. such as L. casei type strain KCTC3109. The L. paracasei strains could utilize almost completely the fructo-oligosaccharides present in Jerusalem artichoke. Inulin-fermenting L. paracasei strains produced c.a. six times more lactic acid compared with L. casei KCTC3109. Direct lactic fermentation of Jerusalem artichoke tuber extract at 111.6g/L of sugar content with a supplement of 5 g/L of yeast extract by L. paracasei KCTC13169 in a 5L jar fermentor produced 92.5 ce:hsp sp="0.25"/>g/L of lactic acid with 16.8 g/L fructose equivalent remained unutilized in 72 h. The conversion efficiency of inulin-type sugars to lactic acid was 98% of the theoretical yield.
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Affiliation(s)
- Hwa-Young Choi
- Industrial Biotechnology Research Center, KRIBB, Daejeon, Republic of Korea
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Farrar K, Bryant DN, Turner L, Gallagher JA, Thomas A, Farrell M, Humphreys MO, Donnison IS. Breeding for Bio-ethanol Production in Lolium perenne L.: Association of Allelic Variation with High Water-Soluble Carbohydrate Content. BIOENERGY RESEARCH 2012; 5:149-157. [PMID: 26366245 PMCID: PMC4560082 DOI: 10.1007/s12155-011-9156-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Increasing the extractable sugar yield from perennial crops is one strategy to generate renewable fuels such as bio-ethanol. Lolium perenne L. (perennial ryegrass) can contain significant (>30% dry matter) water-soluble sugars in the form of polymeric fructan which is readily extracted, broken down and fermented to bio-ethanol. A population of L. perenne generated from four parents which differed in water-soluble carbohydrate (WSC) content was subjected to multiple rounds of selection and recombination on the basis of early spring WSC content to produce a high WSC, and a low WSC population. A control population was generated by selecting the same number of plants at random. The alleles present at six candidate gene loci were analysed before and after selection and correlated to WSC content. Significant differences in the allele frequency of L. perenne soluble-acid invertase1:4 were observed between the three populations with one haplotype significantly associated with the high WSC C2S+ population (after three rounds of selection and two rounds of recombination). Moreover, WSC content was also associated with biomass accumulation. Thus, in addition to a 2.84-fold increase in WSC yield, the C2S+ population also had 1.48-fold more biomass per plant, resulting in 3.9-fold higher WSC yield per plant than the control population.
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Affiliation(s)
- Kerrie Farrar
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - David N. Bryant
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Lesley Turner
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Joe A. Gallagher
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Ann Thomas
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Markku Farrell
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Mervyn O. Humphreys
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
| | - Iain S. Donnison
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EB UK
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β-Fructofuranosidase and sucrose phosphorylase of rumen bacterium Pseudobutyrivibrio ruminis strain 3. World J Microbiol Biotechnol 2011; 28:1271-9. [DOI: 10.1007/s11274-011-0931-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 10/25/2011] [Indexed: 10/15/2022]
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Fine architecture and mutation mapping of human brain inhibitory system ligand gated ion channels by high-throughput homology modeling. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2011; 80:117-52. [PMID: 21109219 DOI: 10.1016/b978-0-12-381264-3.00004-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The common architecture of the brain inhibitory system ligand-gated ion-channels was examined at the level of each of the subunits and in their assembled pentameric arrangements. Structural modeling of the GABAA receptor, GlyR1, and the serotonin receptor, 5HTR3A, was carried out on a multi-homolog basis employing a high-throughput homology modeling pipeline. The locations of all the known mutations of each of the subunits of the receptor subfamily were mapped upon their computed structures and structural relationships between patterns of mutations in different subunits were identified, resulting in the zoning of mutations to four specific regions of the common subunit structure. These classifications may be of value in discerning probable molecular mechanisms and functional manifestations of emerging mutations and polymorphisms, providing the foundation for a family-specific predictive algorithm that may allow researchers to focus experimental effort on the most probable molecular indicators of compromised receptor function and disease mechanism.
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Martel CM, Parker JE, Jackson CJ, Warrilow AGS, Rolley N, Greig C, Morris SM, Donnison IS, Kelly DE, Kelly SL. Expression of bacterial levanase in yeast enables simultaneous saccharification and fermentation of grass juice to bioethanol. BIORESOURCE TECHNOLOGY 2011; 102:1503-8. [PMID: 20801645 DOI: 10.1016/j.biortech.2010.07.099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 07/21/2010] [Accepted: 07/22/2010] [Indexed: 05/13/2023]
Abstract
This study demonstrates use of recombinant yeast to simultaneously saccharify and ferment grass juice (GJ) to bioethanol. A modified Bacillus subtilis levanase gene (sacC) in which the native bacterial signal sequence was replaced with a yeast α-factor domain, was synthesised with yeast codon preferences and transformed into Saccharomyces cerevisiae (strain AH22) using the expression vector pMA91. AH22:psacC transformants secreted sacCp as an active, hyper-glycosylated (>180 kDa) protein allowing them to utilise inulin (β[2-1] linked fructose) and levan (β[2-6] linkages) as growth substrates. The control (AH22:pMA91) strain, transformed with empty plasmid DNA was not able to utilise inulin or levan. When cultured on untreated GJ levels of growth and bioethanol production were significantly higher in experiments with AH22:psacC than with AH22:pMA91. Bioethanol yields from AH22:psacC grown on GJ (32.7[±4] mg mL(-1)) compared closely to those recently achieved (Martel et al., 2010) using enzymatically pre-hydrolysed GJ (36.8[±4] mg mL(-1)).
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Affiliation(s)
- C M Martel
- Institute of Life Science and School of Medicine, Swansea University, Swansea SA2 8PP, Wales, UK
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