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Gutschker S, Ruescher D, Rabbi IY, Rosado-Souza L, Pommerrenig B, Pauly M, Robertz S, van Doorn AM, Schlereth A, Neuhaus HE, Fernie AR, Reinert S, Sonnewald U, Zierer W. Carbon usage in yellow-fleshed Manihot esculenta storage roots shifts from starch biosynthesis to cell wall and raffinose biosynthesis via the myo-inositol pathway. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024. [PMID: 38961707 DOI: 10.1111/tpj.16909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 06/17/2024] [Accepted: 06/20/2024] [Indexed: 07/05/2024]
Abstract
Cassava is a crucial staple crop for smallholder farmers in tropical Asia and Sub-Saharan Africa. Although high yield remains the top priority for farmers, the significance of nutritional values has increased in cassava breeding programs. A notable negative correlation between provitamin A and starch accumulation poses a significant challenge for breeding efforts. The negative correlation between starch and carotenoid levels in conventional and genetically modified cassava plants implies the absence of a direct genomic connection between the two traits. The competition among various carbon pathways seems to account for this relationship. In this study, we conducted a thorough analysis of 49 African cassava genotypes with varying levels of starch and provitamin A. Our goal was to identify factors contributing to differential starch accumulation. Considering carotenoid levels as a confounding factor in starch production, we found that yellow- and white-fleshed storage roots did not differ significantly in most measured components of starch or de novo fatty acid biosynthesis. However, genes and metabolites associated with myo-inositol synthesis and cell wall polymer production were substantially enriched in high provitamin A genotypes. These results indicate that yellow-fleshed cultivars, in comparison to their white-fleshed counterparts, direct more carbon toward the synthesis of raffinose and cell wall components. This finding is underlined by a significant rise in cell wall components measured within the 20 most contrasting genotypes for carotenoid levels. Our findings enhance the comprehension of the biosynthesis of starch and carotenoids in the storage roots of cassava.
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Affiliation(s)
- Sindy Gutschker
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Division of Biochemistry, Erlangen, Germany
| | - David Ruescher
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Division of Biochemistry, Erlangen, Germany
| | - Ismail Y Rabbi
- International Institute of Tropical Agriculture, Ibadan, Nigeria
| | | | | | - Markus Pauly
- Heinrich-Heine-University, Institute of Plant Cell Biology and Biotechnology, Düsseldorf, Germany
| | - Stefan Robertz
- Heinrich-Heine-University, Institute of Plant Cell Biology and Biotechnology, Düsseldorf, Germany
| | - Anna M van Doorn
- International Institute of Tropical Agriculture, Ibadan, Nigeria
| | - Armin Schlereth
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
| | | | - Alisdair R Fernie
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
| | - Stephan Reinert
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Division of Biochemistry, Erlangen, Germany
| | - Uwe Sonnewald
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Division of Biochemistry, Erlangen, Germany
| | - Wolfgang Zierer
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Division of Biochemistry, Erlangen, Germany
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2
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Tan L, Cheng J, Zhang L, Backe J, Urbanowicz B, Heiss C, Azadi P. Pectic-AGP is a major form of Arabidopsis AGPs. Carbohydr Polym 2024; 330:121838. [PMID: 38368088 DOI: 10.1016/j.carbpol.2024.121838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 01/16/2024] [Indexed: 02/19/2024]
Abstract
As a key component in cell walls of numerous organisms ranging from green algae to higher plants, AGPs play principal roles in many biological processes such as cell-cell adhesion and regulating Ca2+ signaling pathway as a Ca2+-capacitor. Consistently, AGP structures vary from species to species and from tissue to tissue. To understand the functions of AGPs, it is vital to know their structural differences relative to their location in the plant. Thus, AGPs were purified from different Arabidopsis tissues. Analyses of these AGPs demonstrated that the AGPs comprised covalently linked pectin and AGP, referred to as pectic-AGPs. Importantly, these pectic-AGPs were glycosylated with a remarkable variety of polysaccharides including homogalacturonan, rhamnogalacturonan-I, and type II arabinogalactan at different ratios and lengths. This result not only suggests that pectic-AGP is a major form of Arabidopsis AGPs, but also supports AGPs serve as crosslinkers covalently connecting pectins with structures tailored for tissue-specific functions.
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Affiliation(s)
- Li Tan
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America.
| | - Jielun Cheng
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
| | - Liang Zhang
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; Department of Biochemistry and Molecular Biology, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
| | - Jason Backe
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; Department of Biochemistry and Molecular Biology, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
| | - Breeanna Urbanowicz
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; Department of Biochemistry and Molecular Biology, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
| | - Christian Heiss
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
| | - Parastoo Azadi
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America; DOE Center for Plant and Microbial Complex Carbohydrates, University of Georgia, 315 Riverbend Road, Athens, GA 30602, United States of America
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Glycoside Hydrolase family 30 harbors fungal subfamilies with distinct polysaccharide specificities. N Biotechnol 2021; 67:32-41. [PMID: 34952234 DOI: 10.1016/j.nbt.2021.12.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 12/19/2021] [Accepted: 12/19/2021] [Indexed: 11/21/2022]
Abstract
Efficient bioconversion of agro-industrial side streams requires a wide range of enzyme activities. Glycoside Hydrolase family 30 (GH30) is a diverse family that contains various catalytic functions and has so far been divided into ten subfamilies (GH30_1-10). In this study, a GH30 phylogenetic tree using over 150 amino acid sequences was contructed. The members of GH30 cluster into four subfamilies and eleven candidates from these subfamilies were selected for biochemical characterization. Novel enzyme activities were identified in GH30. GH30_3 enzymes possess β-(1→6)-glucanase activity. GH30_5 targets β-(1→6)-galactan with mainly β-(1→6)-galactobiohydrolase catalytic behavior. β-(1→4)-Xylanolytic enzymes belong to GH30_7 targeting β-(1→4)-xylan with several activities (e.g. xylobiohydrolase, endoxylanase). Additionally, a new fungal subfamily in GH30 was proposed, i.e. GH30_11, which displays β-(1→6)-galactobiohydrolase. This study confirmed that GH30 fungal subfamilies harbor distinct polysaccharide specificity and have high potential for the production of short (non-digestible) di- and oligosaccharides.
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Duran Garzon C, Habrylo O, Lemaire A, Guillaume A, Carré Y, Millet C, Fourtot-Brun C, Trezel P, Le Blond P, Perrin A, Georgé S, Wagner M, Coutel Y, Levavasseur L, Pau-Roblot C, Pelloux J. Characterization of a novel strain of Aspergillus aculeatinus: From rhamnogalacturonan type I pectin degradation to improvement of fruit juice filtration. Carbohydr Polym 2021; 262:117943. [PMID: 33838820 DOI: 10.1016/j.carbpol.2021.117943] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/09/2021] [Accepted: 03/11/2021] [Indexed: 12/15/2022]
Abstract
Aspergillus spp. are well-known producers of pectinases commonly used in the industry. Aspergillus aculeatinus is a recently identified species but poorly characterized. This study aimed at giving a comprehensive characterization of the enzymatic potential of the O822 strain to produce Rhamnogalacturonan type I (RGI)-degrading enzymes. Proteomic analysis identified cell wall degrading enzymes (cellulases, hemicellulases, and pectinases) that accounted for 92 % of total secreted proteins. Twelve out of fifty proteins were identified as RGI-degrading enzymes. NMR and enzymatic assays revealed high levels of arabinofuranosidase, arabinanase, galactanase, rhamnogalacturonan hydrolases and rhamnogalacturonan acetylesterase activities in aqueous extracts. Viscosity assays carried out with RGI-rich camelina mucilage confirmed the efficiency of enzymes secreted by O822 to hydrolyze RGI, by decreasing viscosity by 70 %. Apple juice trials carried out at laboratory and pilot scale showed an increase in filtration flow rate and yield, paving the way for an industrial use of enzymes derived from A. aculeatinus.
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Affiliation(s)
- Catalina Duran Garzon
- UMR Transfrontalière INRAe BioEcoAgro 1158 - BIOPI, SFR Condorcet FR CNRS 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France
| | - Olivier Habrylo
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Adrien Lemaire
- UMR Transfrontalière INRAe BioEcoAgro 1158 - BIOPI, SFR Condorcet FR CNRS 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France
| | - Anaïs Guillaume
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Yoann Carré
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Clémence Millet
- Centre Technique de la Conservation des Produits Agricoles, 41 avenue Paul Claudel, 80480 Dury-Amiens, France
| | - Catherine Fourtot-Brun
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Pauline Trezel
- UMR Transfrontalière INRAe BioEcoAgro 1158 - BIOPI, SFR Condorcet FR CNRS 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France
| | - Pascal Le Blond
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Aurore Perrin
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Stéphane Georgé
- Centre Technique de la Conservation des Produits Agricoles, 41 avenue Paul Claudel, 80480 Dury-Amiens, France
| | - Magali Wagner
- Centre Technique de la Conservation des Produits Agricoles, 41 avenue Paul Claudel, 80480 Dury-Amiens, France
| | - Yves Coutel
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Loïc Levavasseur
- Centre de Recherche et Innovation Soufflet, 1 rue de la Poterne à Sel, 10400 Nogent sur Seine, France
| | - Corinne Pau-Roblot
- UMR Transfrontalière INRAe BioEcoAgro 1158 - BIOPI, SFR Condorcet FR CNRS 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France
| | - Jérôme Pelloux
- UMR Transfrontalière INRAe BioEcoAgro 1158 - BIOPI, SFR Condorcet FR CNRS 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France.
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5
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Hou F, Du T, Qin Z, Xu T, Li A, Dong S, Ma D, Li Z, Wang Q, Zhang L. Genome-wide in silico identification and expression analysis of beta-galactosidase family members in sweetpotato [Ipomoea batatas (L.) Lam]. BMC Genomics 2021; 22:140. [PMID: 33639840 PMCID: PMC7912918 DOI: 10.1186/s12864-021-07436-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 02/11/2021] [Indexed: 12/12/2022] Open
Abstract
Background Sweetpotato (Ipomoea batatas (L.) Lam.) serves as an important food source for human beings. β-galactosidase (bgal) is a glycosyl hydrolase involved in cell wall modification, which plays essential roles in plant development and environmental stress adaptation. However, the function of bgal genes in sweetpotato remains unclear. Results In this study, 17 β-galactosidase genes (Ibbgal) were identified in sweetpotato, which were classified into seven subfamilies using interspecific phylogenetic and comparative analysis. The promoter regions of Ibbgals harbored several stress, hormone and light responsive cis-acting elements. Quantitative real-time PCR results displayed that Ibbgal genes had the distinct expression patterns across different tissues and varieties. Moreover, the expression profiles under various hormonal treatments, abiotic and biotic stresses were highly divergent in leaves and root. Conclusions Taken together, these findings suggested that Ibbgals might play an important role in plant development and stress responses, which provided evidences for further study of bgal function and sweetpotato breeding. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-021-07436-1.
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Affiliation(s)
- Fuyun Hou
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.,Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China
| | - Taifeng Du
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Zhen Qin
- Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China
| | - Tao Xu
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Aixian Li
- Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China
| | - Shunxu Dong
- Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China
| | - Daifu Ma
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Zongyun Li
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.
| | - Qingmei Wang
- Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China
| | - Liming Zhang
- Key laboratory of phylogeny and comparative genomics of the Jiangsu province, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China. .,Crop research institute, Shandong Academy of Agricultural Sciences/ Scientific Observing and Experimental Station of Tuber and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture and Rural Affairs, Jinan, 250100, China.
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6
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Thakur P, Mukherjee G. Utilization of Agro-waste in Pectinase Production and Its Industrial Applications. RECENT DEVELOPMENTS IN MICROBIAL TECHNOLOGIES 2021. [DOI: 10.1007/978-981-15-4439-2_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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7
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Fullerton CG, Prakash R, Ninan AS, Atkinson RG, Schaffer RJ, Hallett IC, Schröder R. Fruit From Two Kiwifruit Genotypes With Contrasting Softening Rates Show Differences in the Xyloglucan and Pectin Domains of the Cell Wall. FRONTIERS IN PLANT SCIENCE 2020; 11:964. [PMID: 32714354 PMCID: PMC7343912 DOI: 10.3389/fpls.2020.00964] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 06/11/2020] [Indexed: 06/11/2023]
Abstract
Fruit softening is controlled by hormonal and developmental cues, causing an upregulation of cell wall-associated enzymes that break down the complex sugar matrices in the cell wall. The regulation of this process is complex, with different genotypes demonstrating quite different softening patterns, even when they are closely related. Currently, little is known about the relationship between cell wall structure and the rate of fruit softening. To address this question, the softening of two Actinidia chinensis var. chinensis (kiwifruit) genotypes (a fast 'AC-F' and a slow 'AC-S' softening genotype) was examined using a range of compositional, biochemical, structural, and molecular techniques. Throughout softening, the cell wall structure of the two genotypes was fundamentally different at identical firmness stages. In the hemicellulose domain, xyloglucanase enzyme activity was higher in 'AC-F' at the firm unripe stage, a finding supported by differential expression of xyloglucan transglycosylase/hydrolase genes during softening. In the pectin domain, differences in pectin solubilization and location of methyl-esterified homogalacturonan in the cell wall between 'AC-S' and 'AC-F' were shown. Side chain analyses and molecular weight elution profiles of polyuronides and xyloglucans of cell wall extracts revealed fundamental differences between the genotypes, pointing towards a weakening of the structural integrity of cell walls in the fast softening 'AC-F' genotype even at the firm, unripe stage. As a consequence, the polysaccharides in the cell walls of 'AC-F' may be easier to access and hence more susceptible to enzymatic degradation than in 'AC-S', resulting in faster softening. Together these results suggest that the different rates of softening between 'AC-F' and 'AC-S' are not due to changes in enzyme activities alone, but that fundamental differences in the cell wall structure are likely to influence the rates of softening through differential modification and accessibility of specific cell wall polysaccharides during ripening.
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Affiliation(s)
- Christina G. Fullerton
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
- Joint Graduate School of Plant and Food Science, University of Auckland, Auckland, New Zealand
| | - Roneel Prakash
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
| | - Annu Smitha Ninan
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
| | - Ross G. Atkinson
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
| | - Robert J. Schaffer
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
- Joint Graduate School of Plant and Food Science, University of Auckland, Auckland, New Zealand
| | - Ian C. Hallett
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
| | - Roswitha Schröder
- The New Zealand Institute For Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
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Castaño-Peláez HI. Producción de etanol a partir de yuca fresca utilizando la estrategia de proceso HEFS (hidrólisis enzimática y fermentación simultáneas) usando enzimas reductoras de viscosidad. REVISTA POLITÉCNICA 2020. [DOI: 10.33571/rpolitec.v16n31a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Se evaluó la producción de etanol a partir de yuca fresca mediante el uso de enzimas reductoras de viscosidad y enzimas hidrolizantes de almidón en forma granular utilizando la estrategia de proceso de integración en forma simultánea de la hidrólisis y la fermentación. Se utilizaron tubérculos de yuca fresa; se evaluó el efecto del pH, carga enzimática y la cáscara sobre la viscosidad; se evaluó además el prelicuado de los gránulos de almidón y efecto de la carga del complejo Stargen® 01 y el inoculo sobre la producción de etanol. Se realizó la optimización y validación del proceso. El pH, actividad enzimática y la presencia de cascara presentaron efecto sobre la viscosidad; en el sistema HEFS el inóculo y la carga enzimática tuvieron efecto sobre la producción de etanol. Fue posible la producción de etanol mediante el uso de las enzimas degradantes de la pared celular para disminuirla viscosidad y mediante el uso de enzimas hidrolíticas de los gránulos de almidón.
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Yang H, Benatti MR, Karve RA, Fox A, Meilan R, Carpita NC, McCann MC. Rhamnogalacturonan-I is a determinant of cell-cell adhesion in poplar wood. PLANT BIOTECHNOLOGY JOURNAL 2020; 18:1027-1040. [PMID: 31584248 PMCID: PMC7061878 DOI: 10.1111/pbi.13271] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/16/2019] [Accepted: 09/29/2019] [Indexed: 05/19/2023]
Abstract
The molecular basis of cell-cell adhesion in woody tissues is not known. Xylem cells in wood particles of hybrid poplar (Populus tremula × P. alba cv. INRA 717-1B4) were separated by oxidation of lignin with acidic sodium chlorite when combined with extraction of xylan and rhamnogalacturonan-I (RG-I) using either dilute alkali or a combination of xylanase and RG-lyase. Acidic chlorite followed by dilute alkali treatment enables cell-cell separation by removing material from the compound middle lamellae between the primary walls. Although lignin is known to contribute to adhesion between wood cells, we found that removing lignin is a necessary but not sufficient condition to effect complete cell-cell separation in poplar lines with various ratios of syringyl:guaiacyl lignin. Transgenic poplar lines expressing an Arabidopsis thaliana gene encoding an RG-lyase (AtRGIL6) showed enhanced cell-cell separation, increased accessibility of cellulose and xylan to hydrolytic enzyme activities, and increased fragmentation of intact wood particles into small cell clusters and single cells under mechanical stress. Our results indicate a novel function for RG-I, and also for xylan, as determinants of cell-cell adhesion in poplar wood cell walls. Genetic control of RG-I content provides a new strategy to increase catalyst accessibility and saccharification yields from woody biomass for biofuels and industrial chemicals.
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Affiliation(s)
- Haibing Yang
- Department of Biological SciencesPurdue UniversityWest LafayetteINUSA
| | | | - Rucha A. Karve
- Department of Forestry and Natural ResourcesPurdue UniversityWest LafayetteINUSA
| | - Arizona Fox
- Department of Biological SciencesPurdue UniversityWest LafayetteINUSA
- Present address:
Arcadis U.S., Inc150 West Market St., Suite 728IndianapolisIN46204USA
| | - Richard Meilan
- Department of Forestry and Natural ResourcesPurdue UniversityWest LafayetteINUSA
- Purdue Center for Plant BiologyWest LafayetteINUSA
| | - Nicholas C. Carpita
- Department of Biological SciencesPurdue UniversityWest LafayetteINUSA
- Purdue Center for Plant BiologyWest LafayetteINUSA
- Department of Botany and Plant PathologyPurdue UniversityWest LafayetteINUSA
| | - Maureen C. McCann
- Department of Biological SciencesPurdue UniversityWest LafayetteINUSA
- Purdue Center for Plant BiologyWest LafayetteINUSA
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10
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Klaassen MT, Trindade LM. RG-I galactan side-chains are involved in the regulation of the water-binding capacity of potato cell walls. Carbohydr Polym 2020; 227:115353. [DOI: 10.1016/j.carbpol.2019.115353] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 09/11/2019] [Accepted: 09/19/2019] [Indexed: 11/16/2022]
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11
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Rautengarten C, Heazlewood JL, Ebert B. Profiling Cell Wall Monosaccharides and Nucleotide-Sugars from Plants. ACTA ACUST UNITED AC 2019; 4:e20092. [PMID: 31187943 DOI: 10.1002/cppb.20092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The cell wall is an intricate mesh largely composed of polysaccharides that vary in structure and abundance. Apart from cellulose biosynthesis, the assembly of matrix polysaccharides such as pectin and hemicellulose occur in the Golgi apparatus before being transported via vesicles to the cell wall. Matrix polysaccharides are biosynthesized from activated precursors or nucleotide sugars. The composition and assembly of the cell wall is an important aspect in plant development and plant biomass utilization. The application of anion-exchange chromatography to determine the monosaccharide composition of the insoluble matrix polysaccharides enables a complete profile of all major sugars in the cell wall from a single run. While porous carbon graphite chromatography and tandem mass spectrometry delivers a sensitive and robust nucleotide sugar profile from plant extracts. Here we describe detailed methodology to quantify nucleotide sugars within the cell and profile the non-cellulosic monosaccharide composition of the cell wall. © 2019 by John Wiley & Sons, Inc.
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Affiliation(s)
- Carsten Rautengarten
- School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia
| | - Joshua L Heazlewood
- School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia
| | - Berit Ebert
- School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia
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12
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Guo X, Runavot JL, Bourot S, Meulewaeter F, Hernandez-Gomez M, Holland C, Harholt J, Willats WGT, Mravec J, Knox P, Ulvskov P. Metabolism of polysaccharides in dynamic middle lamellae during cotton fibre development. PLANTA 2019; 249:1565-1581. [PMID: 30737556 DOI: 10.1007/s00425-019-03107-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
Evidence is presented that cotton fibre adhesion and middle lamella formation are preceded by cutin dilution and accompanied by rhamnogalacturonan-I metabolism. Cotton fibres are single cell structures that early in development adhere to one another via the cotton fibre middle lamella (CFML) to form a tissue-like structure. The CFML is disassembled around the time of initial secondary wall deposition, leading to fibre detachment. Observations of CFML in the light microscope have suggested that the development of the middle lamella is accompanied by substantial cell-wall metabolism, but it has remained an open question as to which processes mediate adherence and which lead to detachment. The mechanism of adherence and detachment were investigated here using glyco-microarrays probed with monoclonal antibodies, transcript profiling, and observations of fibre auto-digestion. The results suggest that adherence is brought about by cutin dilution, while the presence of relevant enzyme activities and the dynamics of rhamnogalacturonan-I side-chain accumulation and disappearance suggest that both attachment and detachment are accompanied by rhamnogalacturonan-I metabolism.
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Affiliation(s)
- Xiaoyuan Guo
- Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark
| | - Jean-Luc Runavot
- Bayer CropScience NV, Innovation Center, Technologiepark 38, 9052, Ghent, Belgium
| | - Stéphane Bourot
- Bayer CropScience NV, Innovation Center, Technologiepark 38, 9052, Ghent, Belgium
| | - Frank Meulewaeter
- Bayer CropScience NV, Innovation Center, Technologiepark 38, 9052, Ghent, Belgium
| | - Mercedes Hernandez-Gomez
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Claire Holland
- Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark
| | - Jesper Harholt
- Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark
| | - William G T Willats
- School of Agriculture, Food and Rural Development, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Jozef Mravec
- Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark
| | - Paul Knox
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Peter Ulvskov
- Department of Plant and Environmental Sciences, Copenhagen University, Frederiksberg, Denmark.
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13
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Moneo-Sánchez M, Alonso-Chico A, Knox JP, Dopico B, Labrador E, Martín I. β-(1,4)-Galactan remodelling in Arabidopsis cell walls affects the xyloglucan structure during elongation. PLANTA 2019; 249:351-362. [PMID: 30206696 DOI: 10.1007/s00425-018-3008-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 09/07/2018] [Indexed: 05/10/2023]
Abstract
Galactan turnover occurs during cell elongation and affects the cell wall xyloglucan structure which is involved in the interaction between cellulose and xyloglucan. β-(1,4)-Galactan is one of the main side chains of rhamnogalacturonan I. Although the specific function of this polymer has not been completely established, it has been related to different developmental processes. To study β-(1,4)-galactan function, we have generated transgenic Arabidopsis plants overproducing chickpea βI-Gal β-galactosidase under the 35S CaMV promoter (35S::βI-Gal) to reduce galactan side chains in muro. Likewise, an Arabidopsis double loss-of-function mutant for BGAL1 and BGAL3 Arabidopsis β-galactosidases (bgal1/bgal3) has been obtained to increase galactan levels. The characterization of these plants has confirmed the role of β-(1,4)-galactan in cell growth, and demonstrated that the turnover of this pectic side chain occurs during cell elongation, at least in Arabidopsis etiolated hypocotyls and floral stem internodes. The results indicate that BGAL1 and BGAL3 β-galactosidases act in a coordinate way during cell elongation. In addition, this work indicates that galactan plays a role in the maintenance of the cell wall architecture during this process. Our results point to an involvement of the β-(1,4)-galactan in the xyloglucan structure and the interaction between cellulose and xyloglucan.
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Affiliation(s)
- María Moneo-Sánchez
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Dpto de Botánica y Fisiología Vegetal, Facultad de Biología, Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain
| | - Alejandro Alonso-Chico
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Dpto de Botánica y Fisiología Vegetal, Facultad de Biología, Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain
| | - J Paul Knox
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Berta Dopico
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Dpto de Botánica y Fisiología Vegetal, Facultad de Biología, Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain
| | - Emilia Labrador
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Dpto de Botánica y Fisiología Vegetal, Facultad de Biología, Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain.
| | - Ignacio Martín
- Instituto Hispano-Luso de Investigaciones Agrarias (CIALE), Dpto de Botánica y Fisiología Vegetal, Facultad de Biología, Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain
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14
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Canaveze Y, Mastroberti AA, Mariath JEDA, Machado SR. Cytological differentiation and cell wall involvement in the growth mechanisms of articulated laticifers in Tabernaemontana catharinensis A.DC. (Apocynaceae). PROTOPLASMA 2019; 256:131-146. [PMID: 29998452 DOI: 10.1007/s00709-018-1284-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 07/03/2018] [Indexed: 06/08/2023]
Abstract
The cellular mechanisms of laticifer growth are of particular interest in plant biology but are commonly neglected. Using transmission electron microscopy and immunocytochemical methods, we recorded cytological differentiation and evaluated the cell wall involvement in the growth of articulated laticifers with intrusive growth in the mature embryo and plant shoot apex of Tabernaemontana catharinensis. The incorporation of adjacent meristematic cells into the laticifer system occurred in the embryo and plant shoot apex, and the incorporated cells acquired features of laticifer, confirming the laticifers' action-inducing mechanism. In the embryo, this was the main growth mechanism, and began with enlargement of the plasmodesmata and the formation of pores between laticifers and meristematic cells. In the plant shoot apex, it began with loose and disassembled walls and the reorientation of the cortical microtubules of the incorporated cell. Plasmodesmata were absent in these laticifers. There was stronger evidence of intrusive growth in undifferentiated portions of the plant shoot apex than in the embryo. The numerous plasmodesmata in laticifers of the embryo may have been related to the lower frequency of intrusive growth. Intrusive growth was associated with presence of arabinan (increasing wall flexibility and fluidity), and absence of galactan (avoiding wall stiffness), and callose (as a consequence of reduction in symplastic connections) in the laticifer walls. The abundance of low de-methyl-esterified homogalacturonan in the middle lamella and corners may reestablish cell-cell bonding in the laticifers. The cell wall features differed between embryo and plant shoot apex and are directly associated to laticifer growth mechanisms.
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Affiliation(s)
- Yve Canaveze
- Department of Botany, Institute of Biosciences, Universidade Estadual Paulista - UNESP, Botucatu, São Paulo, Brazil.
| | | | | | - Silvia Rodrigues Machado
- Department of Botany, Institute of Biosciences, Universidade Estadual Paulista - UNESP, Botucatu, São Paulo, Brazil
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15
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Ebert B, Birdseye D, Liwanag AJM, Laursen T, Rennie EA, Guo X, Catena M, Rautengarten C, Stonebloom SH, Gluza P, Pidatala VR, Andersen MCF, Cheetamun R, Mortimer JC, Heazlewood JL, Bacic A, Clausen MH, Willats WGT, Scheller HV. The Three Members of the Arabidopsis Glycosyltransferase Family 92 are Functional β-1,4-Galactan Synthases. PLANT & CELL PHYSIOLOGY 2018; 59:2624-2636. [PMID: 30184190 DOI: 10.1093/pcp/pcy180] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/31/2018] [Indexed: 05/18/2023]
Abstract
Pectin is a major component of primary cell walls and performs a plethora of functions crucial for plant growth, development and plant-defense responses. Despite the importance of pectic polysaccharides their biosynthesis is poorly understood. Several genes have been implicated in pectin biosynthesis by mutant analysis, but biochemical activity has been shown for very few. We used reverse genetics and biochemical analysis to study members of Glycosyltransferase Family 92 (GT92) in Arabidopsis thaliana. Biochemical analysis gave detailed insight into the properties of GALS1 (Galactan synthase 1) and showed galactan synthase activity of GALS2 and GALS3. All proteins are responsible for adding galactose onto existing galactose residues attached to the rhamnogalacturonan-I (RG-I) backbone. Significant GALS activity was observed with galactopentaose as acceptor but longer acceptors are favored. Overexpression of the GALS proteins in Arabidopsis resulted in accumulation of unbranched β-1, 4-galactan. Plants in which all three genes were inactivated had no detectable β-1, 4-galactan, and surprisingly these plants exhibited no obvious developmental phenotypes under standard growth conditions. RG-I in the triple mutants retained branching indicating that the initial Gal substitutions on the RG-I backbone are added by enzymes different from GALS.
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Affiliation(s)
- Berit Ebert
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Devon Birdseye
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - April J M Liwanag
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Tomas Laursen
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Emilie A Rennie
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Xiaoyuan Guo
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Michela Catena
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Carsten Rautengarten
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Solomon H Stonebloom
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Pawel Gluza
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Venkataramana R Pidatala
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Mathias C F Andersen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Roshan Cheetamun
- ARC Centre of Excellence in Plant Cell Walls, School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Jenny C Mortimer
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | | | - Antony Bacic
- ARC Centre of Excellence in Plant Cell Walls, School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Mads H Clausen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - William G T Willats
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Henrik V Scheller
- Joint BioEnergy Institute and Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA
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16
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Izquierdo L, Martín I, Albornos L, Hernández-Nistal J, Hueso P, Dopico B, Labrador E. Overexpression of Cicer arietinum βIII-Gal but not βIV-Gal in arabidopsis causes a reduction of cell wall β-(1,4)-galactan compensated by an increase in homogalacturonan. JOURNAL OF PLANT PHYSIOLOGY 2018; 231:135-146. [PMID: 30268077 DOI: 10.1016/j.jplph.2018.09.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/10/2018] [Accepted: 09/18/2018] [Indexed: 06/08/2023]
Abstract
In Cicer arietinum, as in several plant species, the β-galactosidases are encoded by multigene families, although the role of the different proteins is not completely elucidated. Here, we focus in 2 members of this family, βIII-Gal and βIV-Gal, with high degree of amino acid sequence identity (81%), but involved in different developmental processes according to previous studies. Our objective is to deepen in the function of these proteins by establishing their substrate specificity and the possible alterations caused in the cell wall polysaccharides when they are overproduced in Arabidopsis thaliana by constructing the 35S::βIII-Gal and 35S::βIV-Gal transgenic plants. βIII-Gal does cause visible alterations of the morphology of the transgenic plant, all related to a decrease in growth at different stages of development. FTIR spectroscopy and immunological studies showed that βIII-Gal causes changes in the structure of the arabidopsis cell wall polysaccharides, mainly a reduction of the galactan side chains which is compensated by a marked increase in homogalacturonan, which allows us to attribute to galactan a role in the control of the architecture of the cell wall, and therefore in the processes of growth. The 35S::βIV-Gal plants do not present any phenotypic changes, neither in their morphology nor in their cell walls. In spite of the high sequence homology, our results show different specificity of substrate for these proteins, maybe due to other dissimilar characteristics, such as isoelectric points or the number of N-glycosylation sites, which could determine their enzymatic properties and their distinct action in the cell walls.
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Affiliation(s)
- Lucía Izquierdo
- Departamento de Botánica y Fisiología Vegetal, Centro Hispano Luso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, Salamanca, 37007, Spain
| | - Ignacio Martín
- Departamento de Botánica y Fisiología Vegetal, Centro Hispano Luso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, Salamanca, 37007, Spain
| | - Lucía Albornos
- Departamento de Botánica y Fisiología Vegetal, Centro Hispano Luso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, Salamanca, 37007, Spain
| | | | - Pablo Hueso
- Departamento de Bioquímica y Biología Molecular, Universidad de Salamanca, Salamanca, 37007, Spain
| | - Berta Dopico
- Departamento de Botánica y Fisiología Vegetal, Centro Hispano Luso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, Salamanca, 37007, Spain
| | - Emilia Labrador
- Departamento de Botánica y Fisiología Vegetal, Centro Hispano Luso de Investigaciones Agrarias (CIALE), Universidad de Salamanca, Salamanca, 37007, Spain.
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17
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Saffer AM. Expanding roles for pectins in plant development. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2018; 60:910-923. [PMID: 29727062 DOI: 10.1111/jipb.12662] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 05/02/2018] [Indexed: 05/19/2023]
Abstract
Pectins are complex cell wall polysaccharides important for many aspects of plant development. Recent studies have discovered extensive physical interactions between pectins and other cell wall components, implicating pectins in new molecular functions. Pectins are often localized in spatially-restricted patterns, and some of these non-uniform pectin distributions contribute to multiple aspects of plant development, including the morphogenesis of cells and organs. Furthermore, a growing number of mutants affecting cell wall composition have begun to reveal the distinct contributions of different pectins to plant development. This review discusses the interactions of pectins with other cell wall components, the functions of pectins in controlling cellular morphology, and how non-uniform pectin composition can be an important determinant of developmental processes.
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Affiliation(s)
- Adam M Saffer
- Department of Molecular, Cellular and Developmental Biology, Yale University, OML260, 266 Whitney Ave, New Haven, CT 06520-8104, USA
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18
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Effects of high hydrostatic pressure and high pressure homogenization processing on characteristics of potato peel waste pectin. Carbohydr Polym 2018; 196:474-482. [PMID: 29891321 DOI: 10.1016/j.carbpol.2018.05.061] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/08/2018] [Accepted: 05/18/2018] [Indexed: 12/26/2022]
Abstract
To better understand the effects of high pressure processing on potato peel waste pectins, the structural characteristics, physicochemical properties, and morphological features of the pectin treated with high hydrostatic pressure (HHP) and high pressure homogenization (HPH) at 200 MPa for 5 min were studied. The potato peel waste pectins subjected to high pressure treatments exhibited increased galacturonic acid contents as well as decreased esterification degree, (Gal + Ara)/Rha ratio, and molecular weight. Furthermore, the potato peel waste pectins treated with high pressure had an increased viscosity and improved emulsifying properties. The morphological features, determined by atomic force microscopy, shown the degradation of side chains of the pectin induced by high pressure treatments. The results suggest that high pressure processing is an efficient technique to modify pectin from potato peel waste to a thickener or stabilizer agent, but high pressure homogenization shows a better effect.
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19
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Yang JS, Mu TH, Ma MM. Extraction, structure, and emulsifying properties of pectin from potato pulp. Food Chem 2017; 244:197-205. [PMID: 29120771 DOI: 10.1016/j.foodchem.2017.10.059] [Citation(s) in RCA: 156] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 09/28/2017] [Accepted: 10/09/2017] [Indexed: 11/29/2022]
Abstract
Effects of HCl, H2SO4, HNO3, citric acid, and acetic acid on the yield, structure, and emulsifying properties of potato pectins were investigated. Results showed that the highest yield (14.34%) was obtained using citric acid, followed by HNO3 (9.83%), HCl (9.72%), H2SO4 (8.38%), and acetic acid (4.08%). The degrees of methylation (37.45%) and acetylation (15.38%), protein content (6.97%), and molecular weight (3.207 × 105 g/mol) were the highest for pectin extracted using acetic acid, and (galactose + arabinose)/rhamnose was 33.34, indicating that it had a highly branched rhamnogalacturonan I domain. Fourier transform infrared spectroscopy showed a specific absorbance peak at 1064 cm-1, which corresponds to the acetyl groups in potato pectins. SEM showed that all potato pectins are morphologically different. The emulsifying activity (EA, 44.97%-47.71%) and emulsion stability (ES, 36.54%-46.00%) of the pectins were influenced by acid types, and were higher than those of commercial citrus and apple pectin.
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Affiliation(s)
- Jin-Shu Yang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, No. 2 Yuan Ming Yuan West Road, Haidian District, PO Box 5109, Beijing 100193, China.
| | - Tai-Hua Mu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, No. 2 Yuan Ming Yuan West Road, Haidian District, PO Box 5109, Beijing 100193, China.
| | - Meng-Mei Ma
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, No. 2 Yuan Ming Yuan West Road, Haidian District, PO Box 5109, Beijing 100193, China.
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20
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Simultaneous saccharification and viscosity reduction of cassava pulp using a multi-component starch- and cell-wall degrading enzyme for bioethanol production. 3 Biotech 2017; 7:290. [PMID: 28868217 DOI: 10.1007/s13205-017-0924-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Accepted: 08/20/2017] [Indexed: 01/12/2023] Open
Abstract
In this study, an efficient ethanol production process using simultaneous saccharification and viscosity reduction of raw cassava pulp with no prior high temperature pre-gelatinization/liquefaction step was developed using a crude starch- and cell wall-degrading enzyme preparation from Aspergillus aculeatus BCC17849. Proteomic analysis revealed that the enzyme comprised a complex mixture of endo- and exo-acting amylases, cellulases, xylanases, and pectina ses belonging to various glycosyl hydrolase families. Enzymatic hydrolysis efficiency was dependent on the initial solid loading in the reaction. Reduction in mixture viscosity was observed with a rapid decrease in complex viscosity from 3785 to 0.45 Pa s with the enzyme dosage of 2.19 mg/g on a dried weight basis within the first 2 h, which resulted from partial destruction of the plant cell wall fiber and degradation of the released starch granules by the enzymes as shown by scanning electron microscopy. Saccharification of cassava pulp at an initial solid of 16% (w/v) in a bench-scale bioreactor resulted in 736.4 mg glucose/g, which is equivalent to 82.92% glucose yield based on the total starch and glucan in the substrate, after 96 h at 40 °C. Simultaneous saccharification and fermentation of cassava pulp by Saccharomyces cerevisiae with the uncooked enzymatic process led to a final ethanol concentration of 6.98% w/v, equivalent to 96.7% theoretical yield based on the total starch and cellulose content. The results demonstrated potential of the enzyme for low-energy processing of cassava pulp in biofuel industry.
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21
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Optimization of aqueous pectin extraction from Citrus medica peel. Carbohydr Polym 2017; 178:27-33. [PMID: 29050593 DOI: 10.1016/j.carbpol.2017.08.098] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/26/2017] [Accepted: 08/19/2017] [Indexed: 01/28/2023]
Abstract
In this study, the effect of aqueous extraction conditions (temperature of 70-90°C, time of 60-180min, and liquid/solid ratio (LSR) of 20-40v/w) on the yield and degree of esterification (DE) of Citrus medica peel pectin was studied using a Box-Behnken design. The highest production yield of pectin (21.85±0.35%) was obtained at temperature of 90°C, extraction time of 180min and LSR of 40v/w as optimum extraction conditions which was close to the predicted value (24.13%). In these extraction conditions, the DE and the emulsifying activity were 77.2 and 46.5%, respectively. Also, the emulsions were 90.30 and 90% stable at 4°C, and 83.87 and 83.50% at 25°C after 1 and 30days, respectively. The determination of flow behavior showed that the pectin solutions had a Newtonian behavior at low concentrations (0.1, 0.5 and 1.0%w/v), while in higher concentration (2.0%w/v), the pseudoplastic flow behavior became dominant.
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22
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O'Donoghue EM, Somerfield SD, Deroles SC, Sutherland PW, Hallett IC, Erridge ZA, Brummell DA, Hunter DA. Simultaneous knock-down of six β-galactosidase genes in petunia petals prevents loss of pectic galactan but decreases petal strength. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2017; 113:208-221. [PMID: 28254702 DOI: 10.1016/j.plaphy.2017.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 02/05/2017] [Indexed: 05/02/2023]
Abstract
Galactose (Gal) is incorporated into cell wall polysaccharides as flowers open, but then is lost because of β-galactosidase activity as flowers mature and wilt. The significance of this for flower physiology resides in the role of galactan-containing polysaccharides in the cell wall, which is still largely unresolved. To investigate this, transcript accumulation of six cell wall-associated β-galactosidases was simultaneously knocked down in 'Mitchell' petunia (Petunia axillaris x (P. axillaris x P. hybrida)) flower petals. The multi-PhBGAL RNAi construct targeted three bud- and three senescence-associated β-galactosidase genes. The petals of the most down-regulated line (GA19) were significantly disrupted in galactose turnover during flower opening, and at the onset of senescence had retained 86% of their galactose compared with 20% in the controls. The Gal content of Na2CO3-soluble cell wall extracts and the highly insoluble polysaccharides associated with cellulose were particularly affected. Immunodetection with the antibody LM5 showed that much of the cell wall Gal in GA19 was retained as galactan, presumably the side-chains of rhamnogalacturonan-I. The flowers of GA19, despite having retained substantially more galactan, were no different from controls in their internal cell arrangement, dimensions, weight or timing of opening and senescence. However, the GA19 petals had less petal integrity (as judged by force required to cause petal fracture) after opening and showed a greater decline in this integrity with time than controls, raising the possibility that galactan loss is a mechanism for helping to maintain petal tissue cohesion after flower opening.
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Affiliation(s)
- Erin M O'Donoghue
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand.
| | - Sheryl D Somerfield
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand
| | - Simon C Deroles
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand
| | - Paul W Sutherland
- The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Auckland, 1142, New Zealand
| | - Ian C Hallett
- The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Auckland, 1142, New Zealand
| | - Zoë A Erridge
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand
| | - David A Brummell
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand
| | - Donald A Hunter
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Palmerston North, 4442, New Zealand
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23
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Huang JH, Kortstee A, Dees DC, Trindade LM, Visser RG, Gruppen H, Schols HA. Evaluation of both targeted and non-targeted cell wall polysaccharides in transgenic potatoes. Carbohydr Polym 2017; 156:312-321. [DOI: 10.1016/j.carbpol.2016.09.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 09/01/2016] [Accepted: 09/14/2016] [Indexed: 01/09/2023]
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24
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Zhang L, Lilley CJ, Imren M, Knox JP, Urwin PE. The Complex Cell Wall Composition of Syncytia Induced by Plant Parasitic Cyst Nematodes Reflects Both Function and Host Plant. FRONTIERS IN PLANT SCIENCE 2017; 8:1087. [PMID: 28680436 PMCID: PMC5478703 DOI: 10.3389/fpls.2017.01087] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/06/2017] [Indexed: 05/12/2023]
Abstract
Plant-parasitic cyst nematodes induce the formation of specialized feeding structures, syncytia, within their host roots. These unique plant organs serve as the sole nutrient resource for development and reproduction throughout the biotrophic interaction. The multinucleate syncytium, which arises through local dissolution of cell walls and protoplast fusion of multiple adjacent cells, has dense cytoplasm containing numerous organelles, surrounded by thickened outer cell walls that must withstand high turgor pressure. However, little is known about how the constituents of the syncytial cell wall and their conformation support its role during nematode parasitism. We used a set of monoclonal antibodies, targeted to a range of plant cell wall components, to reveal the microstructures of syncytial cell walls induced by four of the most economically important cyst nematode species, Globodera pallida, Heterodera glycines, Heterodera avenae and Heterodera filipjevi, in their respective potato, soybean, and spring wheat host roots. In situ fluorescence analysis revealed highly similar cell wall composition of syncytia induced by G. pallida and H. glycines. Both consisted of abundant xyloglucan, methyl-esterified homogalacturonan and pectic arabinan. In contrast, the walls of syncytia induced in wheat roots by H. avenae and H. filipjevi contain little xyloglucan but are rich in feruloylated xylan and arabinan residues, with variable levels of mixed-linkage glucan. The overall chemical composition of syncytial cell walls reflected the general features of root cell walls of the different host plants. We relate specific components of syncytial cell walls, such as abundant arabinan, methyl-esterification status of pectic homogalacturonan and feruloylation of xylan, to their potential roles in forming a network to support both the strength and flexibility required for syncytium function.
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Affiliation(s)
- Li Zhang
- Faculty of Biological Sciences, University of LeedsLeeds, United Kingdom
| | | | - Mustafa Imren
- Faculty of Agriculture and Natural Sciences, Abant Izzet Baysal UniversityBolu, Turkey
| | - J. Paul Knox
- Faculty of Biological Sciences, University of LeedsLeeds, United Kingdom
| | - Peter E. Urwin
- Faculty of Biological Sciences, University of LeedsLeeds, United Kingdom
- *Correspondence: Peter E. Urwin,
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Ngolong Ngea GL, Guillon F, Essia Ngang JJ, Bonnin E, Bouchet B, Saulnier L. Modification of cell wall polysaccharides during retting of cassava roots. Food Chem 2016; 213:402-409. [DOI: 10.1016/j.foodchem.2016.06.107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 06/24/2016] [Accepted: 06/29/2016] [Indexed: 10/21/2022]
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Penicillium purpurogenum produces a highly stable endo-β-(1,4)-galactanase. Appl Biochem Biotechnol 2016; 180:1313-1327. [PMID: 27339187 DOI: 10.1007/s12010-016-2169-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 06/13/2016] [Indexed: 10/21/2022]
Abstract
The polysaccharides of galactose present in the pectin of the plant cell wall are degraded by endo-β-1,4-galactanases. The filamentous fungus Penicillium purpurogenum, which grows on a number of natural carbon sources, among them sugar beet pulp which contains pectin, has a gene (ppgal1) coding an endo-β-1,4-galactanase (PpGAL1). This enzyme was expressed heterologously in Pichia pastoris. It has a molecular mass of 38 kDa, a pH optimum of 4-4.5, and an optimal temperature of 60 °C. It is 100 % stable for up to 24 h at pH 4-4.5 and 40 °C. These stability properties, which exceed those from other endo-β-1,4-galactanases reported to date, make it particularly suitable for industrial processes requiring acidic conditions and temperatures up to 40 °C. PpGAL1 is, therefore, a potentially effective tool in the food industry and in other biotechnological applications.
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27
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Huang JH, Kortstee A, Dees DCT, Trindade LM, Schols HA, Gruppen H. Alteration of cell wall polysaccharides through transgenic expression of UDP-Glc 4-epimerase-encoding genes in potato tubers. Carbohydr Polym 2016; 146:337-44. [PMID: 27112882 DOI: 10.1016/j.carbpol.2016.03.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 02/27/2016] [Accepted: 03/16/2016] [Indexed: 11/18/2022]
Abstract
Uridine diphosphate (UDP)-glucose 4-epimerase (UGE) catalyzes the conversion of UDP-glucose to UDP-galactose. Cell wall materials from the cv. Kardal (wild-type, background) and two UGE transgenic lines (UGE 45-1 and UGE 51-16) were isolated and fractionated. The galactose (Gal) content (mg/100g tuber) from UGE 45-1 transgenic line was 38% higher than that of wild-type, and resulted in longer pectin side chains. The Gal content present in UGE 51-16 was 17% lower than that of wild-type, although most pectin populations maintained the same level of Gal. Both UGE transgenic lines showed unexpectedly a decrease in acetylation and an increase in methyl-esterification of pectin. Both UGE transgenic lines showed similar proportions of homogalacturonan and rhamnogalacturonan I within pectin backbone as the wild-type, except for the calcium-bound pectin fraction exhibiting relatively less rhamnogalacturonan I. Next to pectin modification, xyloglucan populations from both transgenic lines were altered resulting in different XSGG and XXGG proportion in comparison to wild-type.
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Affiliation(s)
- Jie-Hong Huang
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
| | - Anne Kortstee
- Wageningen UR Plant Breeding, Wageningen University and Research Centre, Wageningen, The Netherlands.
| | - Dianka C T Dees
- Wageningen UR Plant Breeding, Wageningen University and Research Centre, Wageningen, The Netherlands.
| | - Luisa M Trindade
- Wageningen UR Plant Breeding, Wageningen University and Research Centre, Wageningen, The Netherlands.
| | - Henk A Schols
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
| | - Harry Gruppen
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
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Modification of potato cell wall pectin by the introduction of rhamnogalacturonan lyase and β-galactosidase transgenes and their side effects. Carbohydr Polym 2016; 144:9-16. [PMID: 27083787 DOI: 10.1016/j.carbpol.2016.02.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 02/10/2016] [Accepted: 02/11/2016] [Indexed: 11/20/2022]
Abstract
Genes encoding pectic enzymes were introduced to wild-type potato Karnico. Cell wall materials were extracted from Karnico and transgenic lines expressing β-galactosidase (β-Gal-14 mutant) or rhamnogalacturonan lyase (RGL-18 mutant). After sequential extraction, β-Gal-14 hot buffer-soluble solids (HBSS) of pectin contained 54% less galactose than Karnico HBSS, representing shorter galactan side chains. The individual pectin populations of β-Gal-14 HBSS showed different modifications extended to the two sub-populations as obtained by ion-exchange chromatography. Compared to wild-type, RGL-18 HBSS contained 27% more galacturonic acid and 55% less Gal on fresh potato weight basis, which was due to the removal of galactan-rich rhamnogalacturonan I (RG-I) segments. All pectin populations of RGL-18 showed consistently low levels of RG-I segments. Transgenic modification showed side effects on the methyl-esterification and acetyl substitution of RGL-18 HBSS (DM=53, DA=21), but not of the β-Gal-14 HBSS in comparison to wild-type (DM=29, DA=54).
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Buffetto F, Cornuault V, Rydahl MG, Ropartz D, Alvarado C, Echasserieau V, Le Gall S, Bouchet B, Tranquet O, Verhertbruggen Y, Willats WGT, Knox JP, Ralet MC, Guillon F. The Deconstruction of Pectic Rhamnogalacturonan I Unmasks the Occurrence of a Novel Arabinogalactan Oligosaccharide Epitope. PLANT & CELL PHYSIOLOGY 2015; 56:2181-96. [PMID: 26384432 DOI: 10.1093/pcp/pcv128] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 09/02/2015] [Indexed: 05/18/2023]
Abstract
Rhamnogalacturonan I (RGI) is a pectic polysaccharide composed of a backbone of alternating rhamnose and galacturonic acid residues with side chains containing galactose and/or arabinose residues. The structure of these side chains and the degree of substitution of rhamnose residues are extremely variable and depend on species, organs, cell types and developmental stages. Deciphering RGI function requires extending the current set of monoclonal antibodies (mAbs) directed to this polymer. Here, we describe the generation of a new mAb that recognizes a heterogeneous subdomain of RGI. The mAb, INRA-AGI-1, was produced by immunization of mice with RGI oligosaccharides isolated from potato tubers. These oligomers consisted of highly branched RGI backbones substituted with short side chains. INRA-AGI-1 bound specifically to RGI isolated from galactan-rich cell walls and displayed no binding to other pectic domains. In order to identify its RGI-related epitope, potato RGI oligosaccharides were fractionated by anion-exchange chromatography. Antibody recognition was assessed for each chromatographic fraction. INRA-AGI-1 recognizes a linear chain of (1→4)-linked galactose and (1→5)-linked arabinose residues. By combining the use of INRA-AGI-1 with LM5, LM6 and INRA-RU1 mAbs and enzymatic pre-treatments, evidence is presented of spatial differences in RGI motif distribution within individual cell walls of potato tubers and carrot roots. These observations raise questions about the biosynthesis and assembly of pectin structural domains and their integration and remodeling in cell walls.
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Affiliation(s)
- Fanny Buffetto
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France Present address: Institute for Wine Biotechnology, Department of Viticulture and Oenology, Faculty of AgriSciences, Stellenbosch University, Matieland 7602, South Africa
| | - Valérie Cornuault
- Centre for Plant Sciences, Faculty of Biological Sciences University of Leeds, Leeds LS2 9JT, UK
| | - Maja Gro Rydahl
- Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark
| | - David Ropartz
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - Camille Alvarado
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | | | - Sophie Le Gall
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - Brigitte Bouchet
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - Olivier Tranquet
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | | | - William G T Willats
- Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark
| | - J Paul Knox
- Centre for Plant Sciences, Faculty of Biological Sciences University of Leeds, Leeds LS2 9JT, UK
| | | | - Fabienne Guillon
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
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Lindqvist-Kreuze H, Khan A, Salas E, Meiyalaghan S, Thomson S, Gomez R, Bonierbale M. Tuber shape and eye depth variation in a diploid family of Andean potatoes. BMC Genet 2015; 16:57. [PMID: 26024857 PMCID: PMC4448561 DOI: 10.1186/s12863-015-0213-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 05/04/2015] [Indexed: 01/27/2023] Open
Abstract
Background Tuber appearance is highly variable in the Andean cultivated potato germplasm. The diploid backcross mapping population ‘DMDD’ derived from the recently sequenced genome ‘DM’ represents a sample of the allelic variation for tuber shape and eye depth present in the Andean landraces. Here we evaluate the utility of morphological descriptors for tuber shape for identification of genetic loci responsible for the shape and eye depth variation. Results Subjective morphological descriptors and objective tuber length and width measurements were used for assessment of variation in tuber shape and eye depth. Phenotypic data obtained from three trials and male–female based genetic maps were used for quantitative trait locus (QTL) identification. Seven morphological tuber shapes were identified within the population. A continuous distribution of phenotypes was found using the ratio of tuber length to tuber width and a QTL was identified in the paternal map on chromosome 10. Using toPt-437059, the marker at the peak of this QTL, the seven tuber shapes were classified into two groups: cylindrical and non-cylindrical. In the first group, shapes classified as ‘compressed’, ‘round’, ‘oblong’, and ‘long-oblong’ mainly carried a marker allele originating from the male parent. The tubers in this group had deeper eyes, for which a strong QTL was found at the same location on chromosome 10 of the paternal map. The non-cylindrical tubers classified as ‘obovoid’, ‘elliptic’, and ‘elongated’ were in the second group, mostly lacking the marker allele originating from the male parent. The main QTL for shape and eye depth were located in the same genomic region as the previously mapped dominant genes for round tuber shape and eye depth. A number of candidate genes underlying the significant QTL markers for tuber shape and eye depth were identified. Conclusions Utilization of a molecular marker at the shape and eye depth QTL enabled the reclassification of the variation in general tuber shape to two main groups. Quantitative measurement of the length and width at different parts of the tuber is recommended to accompany the morphological descriptor classification to correctly capture the shape variation. Electronic supplementary material The online version of this article (doi:10.1186/s12863-015-0213-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Awais Khan
- International Potato Center (CIP), Av. La Molina 1895, Apartado 1558, Lima 12, Peru.
| | - Elisa Salas
- International Potato Center (CIP), Av. La Molina 1895, Apartado 1558, Lima 12, Peru.
| | - Sathiyamoorthy Meiyalaghan
- The New Zealand Institute for Plant & Food Research Limited, Private Bag 4704, Christchurch, 8140, New Zealand.
| | - Susan Thomson
- The New Zealand Institute for Plant & Food Research Limited, Private Bag 4704, Christchurch, 8140, New Zealand.
| | - Rene Gomez
- International Potato Center (CIP), Av. La Molina 1895, Apartado 1558, Lima 12, Peru.
| | - Merideth Bonierbale
- International Potato Center (CIP), Av. La Molina 1895, Apartado 1558, Lima 12, Peru.
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31
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Ng JKT, Schröder R, Brummell DA, Sutherland PW, Hallett IC, Smith BG, Melton LD, Johnston JW. Lower cell wall pectin solubilisation and galactose loss during early fruit development in apple (Malus x domestica) cultivar 'Scifresh' are associated with slower softening rate. JOURNAL OF PLANT PHYSIOLOGY 2015; 176:129-37. [PMID: 25602611 DOI: 10.1016/j.jplph.2014.12.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 12/14/2014] [Accepted: 12/15/2014] [Indexed: 05/03/2023]
Abstract
Substantial differences in softening behaviour can exist between fruit even within the same species. Apple cultivars 'Royal Gala' and 'Scifresh' soften at different rates despite having a similar genetic background and producing similar amounts of ethylene during ripening. An examination of cell wall metabolism from the fruitlet to the ripe stages showed that in both cultivars pectin solubilisation increased during cell expansion, declined at the mature stage and then increased again during ripening. This process was much less pronounced in the slower softening 'Scifresh' than in 'Royal Gala' at every developmental stage examined, consistent with less cell separation and softening in this cultivar. Both cultivars also exhibited a progressive loss of pectic galactan and arabinan side chains during development. The cell wall content of arabinose residues was similar in both cultivars, but the galactose residue content in 'Scifresh' remained higher than that of 'Royal Gala' at every developmental stage. The higher content of cell wall galactose residue in 'Scifresh' cell walls correlated with a lower β-galactosidase activity and more intense immunolabelling of RG-I galactan side chains in both microscopy sections and glycan microarrays. A high cell wall galactan content has been associated with reduced cell wall porosity, which may restrict access of cell wall-modifying enzymes and thus maintain better structural integrity later in development. The data suggest that the composition and structure of the cell wall at very early development stages may influence subsequent cell wall loosening, and may even predispose the wall's ensuing properties.
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Affiliation(s)
- Jovyn K T Ng
- Food Science, School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand; The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand.
| | - Roswitha Schröder
- The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand.
| | - David A Brummell
- The New Zealand Institute for Plant & Food Research Limited, Food Industry Science Centre, Private Bag 11600, Palmerston North 4442, New Zealand.
| | - Paul W Sutherland
- The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand.
| | - Ian C Hallett
- The New Zealand Institute for Plant & Food Research Limited, Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand.
| | - Bronwen G Smith
- Food Science, School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
| | - Laurence D Melton
- Food Science, School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
| | - Jason W Johnston
- The New Zealand Institute for Plant & Food Research Limited, Private Bag 1401, Havelock North 4157, New Zealand.
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Boutard M, Cerisy T, Nogue PY, Alberti A, Weissenbach J, Salanoubat M, Tolonen AC. Functional diversity of carbohydrate-active enzymes enabling a bacterium to ferment plant biomass. PLoS Genet 2014; 10:e1004773. [PMID: 25393313 PMCID: PMC4230839 DOI: 10.1371/journal.pgen.1004773] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 09/24/2014] [Indexed: 12/16/2022] Open
Abstract
Microbial metabolism of plant polysaccharides is an important part of environmental carbon cycling, human nutrition, and industrial processes based on cellulosic bioconversion. Here we demonstrate a broadly applicable method to analyze how microbes catabolize plant polysaccharides that integrates carbohydrate-active enzyme (CAZyme) assays, RNA sequencing (RNA-seq), and anaerobic growth screening. We apply this method to study how the bacterium Clostridium phytofermentans ferments plant biomass components including glucans, mannans, xylans, galactans, pectins, and arabinans. These polysaccharides are fermented with variable efficiencies, and diauxies prioritize metabolism of preferred substrates. Strand-specific RNA-seq reveals how this bacterium responds to polysaccharides by up-regulating specific groups of CAZymes, transporters, and enzymes to metabolize the constituent sugars. Fifty-six up-regulated CAZymes were purified, and their activities show most polysaccharides are degraded by multiple enzymes, often from the same family, but with divergent rates, specificities, and cellular localizations. CAZymes were then tested in combination to identify synergies between enzymes acting on the same substrate with different catalytic mechanisms. We discuss how these results advance our understanding of how microbes degrade and metabolize plant biomass.
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Affiliation(s)
- Magali Boutard
- Genoscope, CEA, DSV, IG, Évry, France
- CNRS-UMR8030, Évry, France
- Department of Biology, Université d'Évry Val d'Essonne, Évry, France
| | - Tristan Cerisy
- Genoscope, CEA, DSV, IG, Évry, France
- CNRS-UMR8030, Évry, France
- Department of Biology, Université d'Évry Val d'Essonne, Évry, France
| | - Pierre-Yves Nogue
- Genoscope, CEA, DSV, IG, Évry, France
- CNRS-UMR8030, Évry, France
- Department of Biology, Université d'Évry Val d'Essonne, Évry, France
| | | | | | - Marcel Salanoubat
- Genoscope, CEA, DSV, IG, Évry, France
- CNRS-UMR8030, Évry, France
- Department of Biology, Université d'Évry Val d'Essonne, Évry, France
| | - Andrew C. Tolonen
- Genoscope, CEA, DSV, IG, Évry, France
- CNRS-UMR8030, Évry, France
- Department of Biology, Université d'Évry Val d'Essonne, Évry, France
- * E-mail:
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33
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Viscosity reduction of cassava for very high gravity ethanol fermentation using cell wall degrading enzymes from Aspergillus aculeatus. Process Biochem 2014. [DOI: 10.1016/j.procbio.2014.07.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Cankar K, Kortstee A, Toonen MAJ, Wolters-Arts M, Houbein R, Mariani C, Ulvskov P, Jorgensen B, Schols HA, Visser RGF, Trindade LM. Pectic arabinan side chains are essential for pollen cell wall integrity during pollen development. PLANT BIOTECHNOLOGY JOURNAL 2014; 12:492-502. [PMID: 24428422 DOI: 10.1111/pbi.12156] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 11/10/2013] [Accepted: 11/13/2013] [Indexed: 05/06/2023]
Abstract
Pectin is a complex polysaccharide and an integral part of the primary plant cell wall and middle lamella, contributing to cell wall mechanical strength and cell adhesion. To understand the structure-function relationships of pectin in the cell wall, a set of transgenic potato lines with altered pectin composition was analysed. The expression of genes encoding enzymes involved in pectin acetylation, degradation of the rhamnogalacturonan backbone and type and length of neutral side chains, arabinan and galactan in particular, has been altered. Upon crossing of different transgenic lines, some transgenes were not transmitted to the next generation when these lines were used as a pollen donor, suggesting male sterility. Viability of mature pollen was severely decreased in potato lines with reduced pectic arabinan, but not in lines with altered galactan side chains. Anthers and pollen of different developmental stages were microscopically examined to study the phenotype in more detail. Scanning electron microscopy of flowers showed collapsed pollen grains in mature anthers and in earlier stages cytoplasmic protrusions at the site of the of kin pore, eventually leading to bursting of the pollen grain and leaking of the cytoplasm. This phenomenon is only observed after the microspores are released and the tapetum starts to degenerate. Timing of the phenotype indicates a role for pectic arabinan side chains during remodelling of the cell wall when the pollen grain is maturing and dehydrating.
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Affiliation(s)
- Katarina Cankar
- Wageningen UR Plant Breeding, Wageningen University and Research Centre, Wageningen, the Netherlands
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Pogorelko G, Lionetti V, Bellincampi D, Zabotina O. Cell wall integrity: targeted post-synthetic modifications to reveal its role in plant growth and defense against pathogens. PLANT SIGNALING & BEHAVIOR 2013; 8:e25435. [PMID: 23857352 PMCID: PMC4002593 DOI: 10.4161/psb.25435] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 06/17/2013] [Indexed: 05/18/2023]
Abstract
The plant cell wall, a dynamic network of polysaccharides and glycoproteins of significant compositional and structural complexity, functions in plant growth, development and stress responses. In recent years, the existence of plant cell wall integrity (CWI) maintenance mechanisms has been demonstrated, but little is known about the signaling pathways involved, or their components. Examination of key mutants has shed light on the relationships between cell wall remodeling and plant cell responses, indicating a central role for the regulatory network that monitors and controls cell wall performance and integrity. In this review, we present a short overview of cell wall composition and discuss post-synthetic cell wall modification as a valuable approach for studying CWI perception and signaling pathways.
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Affiliation(s)
- Gennady Pogorelko
- Roy J. Carver Department of Biochemistry; Biophysics and Molecular Biology; Iowa State University; Ames, IA USA
| | - Vincenzo Lionetti
- Dipartmento di Biologia e Biotecnologie “Charles Darwin,” Sapienza Università di Roma; Rome, Italy
| | - Daniela Bellincampi
- Dipartmento di Biologia e Biotecnologie “Charles Darwin,” Sapienza Università di Roma; Rome, Italy
| | - Olga Zabotina
- Roy J. Carver Department of Biochemistry; Biophysics and Molecular Biology; Iowa State University; Ames, IA USA
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36
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Svava R, Gurzawska K, Yihau Y, Haugshøj KB, Dirscherl K, Levery SB, Jørgensen NR, Gotfredsen K, Damager I, Ulvskov P, Jørgensen B. The structurally effect of surface coated rhamnogalacturonan I on response of the osteoblast-like cell line SaOS-2. J Biomed Mater Res A 2013; 102:1961-71. [DOI: 10.1002/jbm.a.34868] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 06/16/2013] [Accepted: 06/26/2013] [Indexed: 02/03/2023]
Affiliation(s)
- Rikke Svava
- Department of Plant and Environmental Sciences; Faculty of Science; University of Copenhagen; Thorvaldsensvej 40, Frederiksberg C 1871 Denmark
- Copenhagen Center for Glycomics; Institute for Cellular and Molecular Medicine; Faculty of Health and Medicine Sciences; University of Copenhagen; Blegdamsvej 3 B, Copenhagen N 2200 Denmark
| | - Katarzyna Gurzawska
- Research Center for Ageing and Osteoporosis; Departments of Medicine M and Diagnostics; Copenhagen University Hospital Glostrup; Ndr. Ringvej 69, Glostrup 2600 Denmark
- Department of Odontology; Faculty of Health and Medicine Sciences; University of Copenhagen; Nørre Allé 20, Copenhagen N 2200 Denmark
| | - Yu Yihau
- Microtechnology and Surface Analysis; Danish Technological Institute; Gregersensvej 8, Taastrup 2630 Denmark
| | - Kenneth Brian Haugshøj
- Microtechnology and Surface Analysis; Danish Technological Institute; Gregersensvej 8, Taastrup 2630 Denmark
| | - Kai Dirscherl
- Dansk Fundamental Meterologi A/S; Matematiktorvet 307, Lyngby 2800 Denmark
| | - Steven B. Levery
- Copenhagen Center for Glycomics; Institute for Cellular and Molecular Medicine; Faculty of Health and Medicine Sciences; University of Copenhagen; Blegdamsvej 3 B, Copenhagen N 2200 Denmark
| | - Niklas Rye Jørgensen
- Research Center for Ageing and Osteoporosis; Departments of Medicine M and Diagnostics; Copenhagen University Hospital Glostrup; Ndr. Ringvej 69, Glostrup 2600 Denmark
| | - Klaus Gotfredsen
- Department of Odontology; Faculty of Health and Medicine Sciences; University of Copenhagen; Nørre Allé 20, Copenhagen N 2200 Denmark
| | - Iben Damager
- Department of Plant and Environmental Sciences; Faculty of Science; University of Copenhagen; Thorvaldsensvej 40, Frederiksberg C 1871 Denmark
| | - Peter Ulvskov
- Department of Plant and Environmental Sciences; Faculty of Science; University of Copenhagen; Thorvaldsensvej 40, Frederiksberg C 1871 Denmark
| | - Bodil Jørgensen
- Department of Plant and Environmental Sciences; Faculty of Science; University of Copenhagen; Thorvaldsensvej 40, Frederiksberg C 1871 Denmark
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Günter EA, Popeyko OV, Shkryl YN, Veremeichik GN, Bulgakov VP, Ovodov YS. Effect of the rol genes from Agrobacterium Rhizogenes on the content and structure of pectic substances and glycanase activity in Rubia Cordifolia transgenic cell cultures. APPL BIOCHEM MICRO+ 2013. [DOI: 10.1134/s0003683813040066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sakamoto T, Ishimaru M. Peculiarities and applications of galactanolytic enzymes that act on type I and II arabinogalactans. Appl Microbiol Biotechnol 2013; 97:5201-13. [PMID: 23666442 DOI: 10.1007/s00253-013-4946-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/20/2013] [Accepted: 04/22/2013] [Indexed: 10/26/2022]
Abstract
Arabinogalactans (AGs) are branched galactans to which arabinose residues are bound as side chains and are widely distributed in plant cell walls. They can be grouped into two types based on the structures of their backbones. Type I AGs have β-1,4-galactan backbones and are often covalently linked to the rhamnogalacturonan-I region of pectins. Type II AGs have β-1,3-galactan backbones and are often covalently linked to proteins. The main enzymes involved in the degradation of AGs are endo-β-galactanases, exo-β-galactanases, and β-galactosidases, although other enzymes such as α-L-arabinofuranosidases, β-L-arabinopyranosidases, and β-D-glucuronidases are required to remove the side chains for efficient degradation of the polysaccharides. Galactanolytic enzymes have a wide variety of potential uses, including the bioconversion of AGs to fermentable sugars for production of commodity chemicals like ethanol, biobleaching of cellulose pulp, modulation of pectin properties, improving animal feed, and determining the chemical structure of AGs. This review summarizes our current knowledge about the biochemical properties and potential applications of AG-degrading enzymes.
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Affiliation(s)
- Tatsuji Sakamoto
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
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Rogers TE, Pudlo NA, Koropatkin NM, Bell JSK, Moya Balasch M, Jasker K, Martens EC. Dynamic responses of Bacteroides thetaiotaomicron during growth on glycan mixtures. Mol Microbiol 2013; 88:876-90. [PMID: 23646867 DOI: 10.1111/mmi.12228] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2013] [Indexed: 01/19/2023]
Abstract
Bacteroides thetaiotaomicron (Bt) is a human colonic symbiont that degrades many different complex carbohydrates (glycans), the identities and amounts of which are likely to change frequently and abruptly from meal-to-meal. To understand how this organism reacts to dynamic growth conditions, we challenged it with a series of different glycan mixtures and measured responses involved in glycan catabolism. Our results demonstrate that individual Bt cells can simultaneously respond to multiple glycans and that responses to new glycans are extremely rapid. The presence of alternative carbohydrates does not alter response kinetics, but reduces expression of some glycan utilization genes as well as the cell's sensitivity to glycans that are present in lower concentration. Growth in a mixture containing 12 different glycans revealed that Bt preferentially uses some before others. This metabolic hierarchy is not changed by prior exposure to lower priority glycans because re-introducing high priority substrates late in culture re-initiates repression of genes involved in degrading those with lower priority. At least some carbohydrate prioritization effects occur at the level of monosaccharide recognition. Our results provide insight into how a bacterial glycan generalist modifies its responses in dynamic glycan environments and provide essential knowledge to interpret related metabolic behaviour in vivo.
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Affiliation(s)
- Theresa E Rogers
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
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40
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Production of a high concentration of ethanol from potato tuber by high gravity fermentation. Food Sci Biotechnol 2013. [DOI: 10.1007/s10068-013-0099-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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41
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Liwanag AJM, Ebert B, Verhertbruggen Y, Rennie EA, Rautengarten C, Oikawa A, Andersen MC, Clausen MH, Scheller HV. Pectin biosynthesis: GALS1 in Arabidopsis thaliana is a β-1,4-galactan β-1,4-galactosyltransferase. THE PLANT CELL 2012; 24:5024-36. [PMID: 23243126 PMCID: PMC3556973 DOI: 10.1105/tpc.112.106625] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Revised: 10/22/2012] [Accepted: 11/28/2012] [Indexed: 05/17/2023]
Abstract
β-1,4-Galactans are abundant polysaccharides in plant cell walls, which are generally found as side chains of rhamnogalacturonan I. Rhamnogalacturonan I is a major component of pectin with a backbone of alternating rhamnose and galacturonic acid residues and side chains that include α-1,5-arabinans, β-1,4-galactans, and arabinogalactans. Many enzymes are required to synthesize pectin, but few have been identified. Pectin is most abundant in primary walls of expanding cells, but β-1,4-galactan is relatively abundant in secondary walls, especially in tension wood that forms in response to mechanical stress. We investigated enzymes in glycosyltransferase family GT92, which has three members in Arabidopsis thaliana, which we designated GALACTAN SYNTHASE1, (GALS1), GALS2 and GALS3. Loss-of-function mutants in the corresponding genes had a decreased β-1,4-galactan content, and overexpression of GALS1 resulted in plants with 50% higher β-1,4-galactan content. The plants did not have an obvious growth phenotype. Heterologously expressed and affinity-purified GALS1 could transfer Gal residues from UDP-Gal onto β-1,4-galactopentaose. GALS1 specifically formed β-1,4-galactosyl linkages and could add successive β-1,4-galactosyl residues to the acceptor. These observations confirm the identity of the GT92 enzyme as β-1,4-galactan synthase. The identification of this enzyme could provide an important tool for engineering plants with improved bioenergy properties.
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Affiliation(s)
- April Jennifer Madrid Liwanag
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Berit Ebert
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Yves Verhertbruggen
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Emilie A. Rennie
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
| | - Carsten Rautengarten
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Ai Oikawa
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Mathias C.F. Andersen
- Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - Mads H. Clausen
- Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - Henrik Vibe Scheller
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, California 94608
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
- Address correspondence to
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Orfila C, Dal Degan F, Jørgensen B, Scheller HV, Ray PM, Ulvskov P. Expression of mung bean pectin acetyl esterase in potato tubers: effect on acetylation of cell wall polymers and tuber mechanical properties. PLANTA 2012; 236:185-96. [PMID: 22293853 DOI: 10.1007/s00425-012-1596-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Accepted: 01/11/2012] [Indexed: 05/22/2023]
Abstract
A mung bean (Vigna radiata) pectin acetyl esterase (CAA67728) was heterologously expressed in tubers of potato (Solanum tuberosum) under the control of the granule-bound starch synthase promoter or the patatin promoter in order to probe the significance of O-acetylation on cell wall and tissue properties. The recombinant tubers showed no apparent macroscopic phenotype. The enzyme was recovered from transgenic tubers using a high ionic strength buffer and the extract was active against a range of pectic substrates. Partial in vivo de-acetylation of cell wall polysaccharides occurred in the transformants, as shown by a 39% decrease in the degree of acetylation (DA) of tuber cell wall material (CWM). Treatment of CWM using a combination of endo-polygalacturonase and pectin methyl esterase extracted more pectin polymers from the transformed tissue compared to wild type. The largest effect of the pectin acetyl esterase (68% decrease in DA) was seen in the residue from this extraction, suggesting that the enzyme is preferentially active on acetylated pectin that is tightly bound to the cell wall. The effects of acetylation on tuber mechanical properties were investigated by tests of failure under compression and by determination of viscoelastic relaxation spectra. These tests suggested that de-acetylation resulted in a stiffer tuber tissue and a stronger cell wall matrix, as a result of changes to a rapidly relaxing viscoelastic component. These results are discussed in relation to the role of pectin acetylation in primary cell walls and its implications for industrial uses of potato fibres.
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Affiliation(s)
- Caroline Orfila
- Department of Plant Biology and Biotechnology, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
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Pogorelko G, Fursova O, Lin M, Pyle E, Jass J, Zabotina OA. Post-synthetic modification of plant cell walls by expression of microbial hydrolases in the apoplast. PLANT MOLECULAR BIOLOGY 2011; 77:433-45. [PMID: 21910026 DOI: 10.1007/s11103-011-9822-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 08/23/2011] [Indexed: 05/25/2023]
Abstract
The systematic creation of defined cell wall modifications in the model plant Arabidopsis thaliana by expression of microbial hydrolases with known specific activities is a promising approach to examine the impacts of cell wall composition and structure on both plant fitness and cell wall recalcitrance. Moreover, this approach allows the direct evaluation in living plants of hydrolase specificity, which can differ from in vitro specificity. To express genes encoding microbial hydrolases in A. thaliana, and target the hydrolases to the apoplast compartment, we constructed an expression cassette composed of the Cauliflower Mosaic Virus 35S RNA promoter, the A. thaliana β-expansin signal peptide, and the fluorescent marker protein YFP. Using this construct we successfully introduced into Colombia-0 plants three Aspergillus nidulans hydrolases, β-xylosidase/α-arabinosidase, feruloyl esterase, acetylxylan esterase, and a Xanthomonas oryzae putative a-L: -arabinofuranosidase. Fusion with YFP permitted quick and easy screening of transformants, detection of apoplastic localization, and protein size confirmation. Compared to wild-type Col-0, all transgenic lines showed a significant increase in the corresponding hydrolytic activity in the apoplast and changes in cell wall composition. Examination of hydrolytic activity in the transgenic plants also showed, for the first time, that the X. oryzae gene indeed encoded an enzyme with α-L: -arabinofuranosidase activity. None of the transgenic plants showed a visible phenotype; however, the induced compositional changes increased the degradability of biomass from plants expressing feruloyl esterase and β-xylosidase/α-arabinosidase. Our results demonstrate the viability of creating a set of transgenic A. thaliana plants with modified cell walls to use as a toolset for investigation of how cell wall composition contributes to recalcitrance and affects plant fitness.
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Affiliation(s)
- Gennady Pogorelko
- Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
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Kokkonen H, Verhoef R, Kauppinen K, Muhonen V, Jørgensen B, Damager I, Schols HA, Morra M, Ulvskov P, Tuukkanen J. Affecting osteoblastic responses with in vivo engineered potato pectin fragments. J Biomed Mater Res A 2011; 100:111-9. [DOI: 10.1002/jbm.a.33240] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 06/21/2011] [Accepted: 07/27/2011] [Indexed: 11/08/2022]
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Martínez-Manrique E, Jacinto-Hernández C, Garza-García R, Campos A, Moreno E, Bernal-Lugo I. Enzymatic changes in pectic polysaccharides related to the beneficial effect of soaking on bean cooking time. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:2394-2398. [PMID: 21604279 DOI: 10.1002/jsfa.4474] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2010] [Revised: 12/22/2010] [Accepted: 04/04/2011] [Indexed: 05/30/2023]
Abstract
BACKGROUND Cooking time decreases when beans are soaked first. However, the molecular basis of this decrease remains unclear. To determine the mechanisms involved, changes in both pectic polysaccharides and cell wall enzymes were monitored during soaking. Two cultivars and one breeding line were studied. RESULTS Soaking increased the activity of the cell wall enzymes rhamnogalacturonase, galactanase and polygalacturonase. Their activity in the cell wall was detected as changes in chemical composition of pectic polysaccharides. Rhamnose content decreased but galactose and uronic acid contents increased in the polysaccharides of soaked beans. A decrease in the average molecular weight of the pectin fraction was induced during soaking. The decrease in rhamnose and the polygalacturonase activity were associated (r = 0.933, P = 0.01, and r = 0.725, P = 0.01, respectively) with shorter cooking time after soaking. CONCLUSION Pectic cell wall enzymes are responsible for the changes in rhamnogalacturonan I and polygalacturonan induced during soaking and constitute the biochemical factors that give bean cell walls new polysaccharide arrangements. Rhamnogalacturonan I is dispersed throughout the entire cell wall and interacts with cellulose and hemicellulose fibres, resulting in a higher rate of pectic polysaccharide thermosolubility and, therefore, a shorter cooking time.
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Ross HA, Morris WL, Ducreux LJM, Hancock RD, Verrall SR, Morris JA, Tucker GA, Stewart D, Hedley PE, McDougall GJ, Taylor MA. Pectin engineering to modify product quality in potato. PLANT BIOTECHNOLOGY JOURNAL 2011; 9:848-856. [PMID: 21281424 DOI: 10.1111/j.1467-7652.2011.00591.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Although processed potato tuber texture is an important trait that influences consumer preference, a detailed understanding of tuber textural properties at the molecular level is lacking. Previous work has identified tuber pectin methyl esterase (PME) activity as a potential factor impacting on textural properties, and the expression of a gene encoding an isoform of PME (PEST1) was associated with cooked tuber textural properties. In this study, a transgenic approach was undertaken to investigate further the impact of the PEST1 gene. Antisense and over-expressing potato lines were generated. In over-expressing lines, tuber PME activity was enhanced by up to 2.3-fold; whereas in antisense lines, PME activity was decreased by up to 62%. PME isoform analysis indicated that the PEST1 gene encoded one isoform of PME. Analysis of cell walls from tubers from the over-expressing lines indicated that the changes in PME activity resulted in a decrease in pectin methylation. Analysis of processed tuber texture demonstrated that the reduced level of pectin methylation in the over-expressing transgenic lines was associated with a firmer processed texture. Thus, there is a clear link between PME activity, pectin methylation and processed tuber textural properties.
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Affiliation(s)
- Heather A Ross
- Plant Products and Food Quality Programme, Scottish Crop Research Institute, Dundee, UK
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Cao Y, Tian H, Yao K, Yuan Y. Simultaneous saccharification and fermentation of sweet potato powder for the production of ethanol under conditions of very high gravity. Front Chem Sci Eng 2011. [DOI: 10.1007/s11705-010-1026-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Larsen FH, Byg I, Damager I, Diaz J, Engelsen SB, Ulvskov P. Residue Specific Hydration of Primary Cell Wall Potato Pectin Identified by Solid-State 13C Single-Pulse MAS and CP/MAS NMR Spectroscopy. Biomacromolecules 2011; 12:1844-50. [DOI: 10.1021/bm2001928] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Flemming H. Larsen
- Department of Food Science, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark
| | - Inge Byg
- Department of Plant Biology and Biotechnology, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
- Novozymes A/S, Krogshoejvej 36, DK-2880 Bagsvaerd, Denmark
- CP Kelco Aps, Ved Banen 16, DK-4623 Lille Skensved, Denmark
| | - Iben Damager
- Biotechnology Group, University of Aarhus, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
| | - Jerome Diaz
- Biotechnology Group, University of Aarhus, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
| | - Søren B. Engelsen
- Department of Food Science, University of Copenhagen, Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark
| | - Peter Ulvskov
- Biotechnology Group, University of Aarhus, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
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Hansen SL, Ray PM, Karlsson AO, Jørgensen B, Borkhardt B, Petersen BL, Ulvskov P. Mechanical properties of plant cell walls probed by relaxation spectra. PLANT PHYSIOLOGY 2011; 155:246-58. [PMID: 21075961 PMCID: PMC3075772 DOI: 10.1104/pp.110.166629] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Accepted: 11/09/2010] [Indexed: 05/22/2023]
Abstract
Transformants and mutants with altered cell wall composition are expected to display a biomechanical phenotype due to the structural role of the cell wall. It is often quite difficult, however, to distinguish the mechanical behavior of a mutant's or transformant's cell walls from that of the wild type. This may be due to the plant's ability to compensate for the wall modification or because the biophysical method that is often employed, determination of simple elastic modulus and breakstrength, lacks the resolving power necessary for detecting subtle mechanical phenotypes. Here, we apply a method, determination of relaxation spectra, which probes, and can separate, the viscoelastic properties of different cell wall components (i.e. those properties that depend on the elastic behavior of load-bearing wall polymers combined with viscous interactions between them). A computer program, BayesRelax, that deduces relaxation spectra from appropriate rheological measurements is presented and made accessible through a Web interface. BayesRelax models the cell wall as a continuum of relaxing elements, and the ability of the method to resolve small differences in cell wall mechanical properties is demonstrated using tuber tissue from wild-type and transgenic potatoes (Solanum tuberosum) that differ in rhamnogalacturonan I side chain structure.
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