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Lopez-Rodulfo IM, Tsochatzis ED, Stentoft EW, Martinez-Carrasco P, Bechtner JD, Martinez MM. Partitioning and in vitro bioaccessibility of apple polyphenols during mechanical and physiological extraction: A hierarchical clustering analysis with LC-ESI-QTOF-MS/MS. Food Chem 2024; 441:138320. [PMID: 38199101 DOI: 10.1016/j.foodchem.2023.138320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/09/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024]
Abstract
Polyphenol partitioning during mechanical (cold-pressing) and physiological (digestion) extraction at the individual polyphenol and subclass level was investigated. UHPLC-ESI-QTOF-MS/MS analysis yielded a comprehensive identification of 45 polyphenols whose semi-quantification revealed a hierarchical clustering strongly determined by polyphenol structure and their location within the apple tissue. For instance, pomace retained most flavonols and flavanols (degree of polymerization DP 5-7), which were highly hydrophobic, hydroxylated, or large (>434 Da), and more abundant in peel. In vitro digestion UHPLC-ESI-QTOF-MS/MS analysis of whole apple (and its corresponding matrix-free extract) clustered polyphenols into five main groups according to their interaction with plant cell walls (PCWs) during each digestion phase. This grouping was not reproduced in pomace, which exhibited a greater matrix effect than whole apple during oral and gastric digestion. Nevertheless, the interaction between most polyphenol groups, including dihydrochalcones, flavanols (DP 1-4) and hydroxycinnamic acid derivatives, and pomace PCWs was lost during intestinal digestion.
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Affiliation(s)
- Ivan M Lopez-Rodulfo
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark
| | - Emmanouil D Tsochatzis
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark
| | - Emil W Stentoft
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark
| | - Pamela Martinez-Carrasco
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark
| | - Julia D Bechtner
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark
| | - Mario M Martinez
- Centre for Innovative Food (CiFOOD), Department of Food Science, Aarhus University, Agro Food Park 48, Aarhus N 8200, Denmark.
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2
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Kleuter M, Yu Y, Pancaldi F, Nagtzaam M, van der Goot AJ, Trindade LM. Cell wall as a barrier for protein extraction from tomato leaves: A biochemical study. Plant Physiol Biochem 2024; 208:108495. [PMID: 38452451 DOI: 10.1016/j.plaphy.2024.108495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 03/01/2024] [Indexed: 03/09/2024]
Abstract
Solanum lycopersicum (Tomato) leaves and stems are considered waste. Valorization of this waste can be achieved by for example the extraction of proteins. This prospect is promising but currently not feasible, since protein extraction yields from tomato leaves are low, amongst other due to the (physical) barrier formed by the plant cell walls. However, the molecular aspects of the relationship between cell wall properties and protein extractability from tomato leaves are currently not clear and thus objective of this study. To fill this knowledge gap the biochemical composition of plant cell walls was measured and related to protein extraction yields at different plant ages, leaf positions, and across different tomato accessions, including two Solanum lycopersicum cultivars and the wildtype species S. pimpinellifolium and S. pennellii. For all genotypes, protein extraction yields from tomato leaves were the highest in young tissues, with a decreasing trend towards older plant material. This decrease of protein extraction yield was accompanied by a significant increase of arabinose and galacturonic acid content and a decrease of galactose content in the cell walls of old-vs-young tissues. This resulted in strong negative correlations between protein extraction yield and the content of arabinose and galacturonic acid in the cell wall, and a positive correlation between the content of galactose and protein extraction yield. Overall, these results point to the importance of the pectin network on protein extractability, making pectin a potential breeding target for enhancing protein extractability from tomato leaves.
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Affiliation(s)
- Marietheres Kleuter
- Department of Plant Sciences, Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands.
| | - Yafei Yu
- Laboratory of Food Process Engineering, Wageningen University, PO Box 17, 6700 AA, Wageningen, the Netherlands.
| | - Francesco Pancaldi
- Department of Plant Sciences, Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands.
| | - Mayra Nagtzaam
- Department of Plant Sciences, Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands.
| | - Atze Jan van der Goot
- Laboratory of Food Process Engineering, Wageningen University, PO Box 17, 6700 AA, Wageningen, the Netherlands.
| | - Luisa M Trindade
- Department of Plant Sciences, Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands.
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3
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Hsiung SY, Li J, Imre B, Kao MR, Liao HC, Wang D, Chen CH, Liang PH, Harris PJ, Hsieh YSY. Structures of the xyloglucans in the monocotyledon family Araceae (aroids). Planta 2023; 257:39. [PMID: 36650257 PMCID: PMC9845173 DOI: 10.1007/s00425-023-04071-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
The xyloglucans of all aquatic Araceae species examined had unusual structures compared with those of other non-commelinid monocotyledon families previously examined. The aquatic Araceae species Lemna minor was earlier shown to have xyloglucans with a different structure from the fucogalactoxyloglucans of other non-commelinid monocotyledons. We investigated 26 Araceae species (including L. minor), from five of the seven subfamilies. All seven aquatic species examined had xyloglucans that were unusual in having one or two of three features: < 77% XXXG core motif [L. minor (Lemnoideae) and Orontium aquaticum (Orontioideae)]; no fucosylation [L. minor (Lemnoideae), Cryptocoryne aponogetonifolia, and Lagenandra ovata (Aroideae, Rheophytes clade)]; and > 14% oligosaccharide units with S or D side chains [Spirodela polyrhiza and Landoltia punctata (Lemnoideae) and Pistia stratiotes (Aroideae, Dracunculus clade)]. Orontioideae and Lemnoideae are the two most basal subfamilies, with all species being aquatic, and Aroideae is the most derived. Two terrestrial species [Dieffenbachia seguine and Spathicarpa hastifolia (Aroideae, Zantedeschia clade)] also had xyloglucans without fucose indicating this feature was not unique to aquatic species.
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Affiliation(s)
- Shih-Yi Hsiung
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Jing Li
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden
- College of Life Science, Shanghai Normal University, Shanghai, China
| | - Balazs Imre
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Mu-Rong Kao
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan
| | - Hsien-Chun Liao
- Division of Botany, Taiwan Endemic Species Research Institute, Nantou, 552, Taiwan
| | - Damao Wang
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden
- College of Food Science, Southwest University, Chongqing, China
| | - Chih-Hui Chen
- Division of Botany, Taiwan Endemic Species Research Institute, Nantou, 552, Taiwan
| | - Pi-Hui Liang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Philip J Harris
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - Yves S Y Hsieh
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden.
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan.
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de Vries L, Guevara-Rozo S, Cho M, Liu LY, Renneckar S, Mansfield SD. Tailoring renewable materials via plant biotechnology. Biotechnol Biofuels 2021; 14:167. [PMID: 34353358 PMCID: PMC8344217 DOI: 10.1186/s13068-021-02010-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 07/06/2021] [Indexed: 05/03/2023]
Abstract
Plants inherently display a rich diversity in cell wall chemistry, as they synthesize an array of polysaccharides along with lignin, a polyphenolic that can vary dramatically in subunit composition and interunit linkage complexity. These same cell wall chemical constituents play essential roles in our society, having been isolated by a variety of evolving industrial processes and employed in the production of an array of commodity products to which humans are reliant. However, these polymers are inherently synthesized and intricately packaged into complex structures that facilitate plant survival and adaptation to local biogeoclimatic regions and stresses, not for ease of deconstruction and commercial product development. Herein, we describe evolving techniques and strategies for altering the metabolic pathways related to plant cell wall biosynthesis, and highlight the resulting impact on chemistry, architecture, and polymer interactions. Furthermore, this review illustrates how these unique targeted cell wall modifications could significantly extend the number, diversity, and value of products generated in existing and emerging biorefineries. These modifications can further target the ability for processing of engineered wood into advanced high performance materials. In doing so, we attempt to illuminate the complex connection on how polymer chemistry and structure can be tailored to advance renewable material applications, using all the chemical constituents of plant-derived biopolymers, including pectins, hemicelluloses, cellulose, and lignins.
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Affiliation(s)
- Lisanne de Vries
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
- US Department of Energy (DOE) Great Lakes Bioenergy Research Center, the Wisconsin Energy Institute, University of Wisconsin - Madison, Madison, WI , 53726, USA
| | - Sydne Guevara-Rozo
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - MiJung Cho
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Li-Yang Liu
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Scott Renneckar
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Shawn D Mansfield
- Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
- US Department of Energy (DOE) Great Lakes Bioenergy Research Center, the Wisconsin Energy Institute, University of Wisconsin - Madison, Madison, WI , 53726, USA.
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Rae AE, Wei X, Flores-Rodriguez N, McCurdy DW, Collings DA. Super-Resolution Fluorescence Imaging of Arabidopsis thaliana Transfer Cell Wall Ingrowths using Pseudo-Schiff Labelling Adapted for the Use of Different Dyes. Plant Cell Physiol 2020; 61:1775-1787. [PMID: 32761075 DOI: 10.1093/pcp/pcaa102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 07/28/2020] [Indexed: 05/23/2023]
Abstract
To understand plant growth and development, it is often necessary to investigate the organization of plant cells and plant cell walls. Plant cell walls are often fluorescently labeled for confocal imaging with the dye propidium iodide using a pseudo-Schiff reaction. This reaction binds free amine groups on dye molecules to aldehyde groups on cellulose that result from oxidation with periodic acid. We tested a range of fluorescent dyes carrying free amine groups for their ability to act as pseudo-Schiff reagents. Using the low-pH solution historically used for the Schiff reaction, these alternative dyes failed to label cell walls of Arabidopsis cotyledon vascular tissue as strongly as propidium iodide but replacing the acidic solution with water greatly improved fluorescence labeling. Under these conditions, rhodamine-123 provided improved staining of plant cell walls compared to propidium iodide. We also developed protocols for pseudo-Schiff labeling with ATTO 647N-amine, a dye compatible for super-resolution Stimulated Emission Depletion (STED) imaging. ATTO 647N-amine was used for super-resolution imaging of cell wall ingrowths that occur in phloem parenchyma transfer cells of Arabidopsis, structures whose small size is only slightly larger than the resolution limit of conventional confocal microscopy. Application of surface-rendering software demonstrated the increase in plasma membrane surface area as a consequence of wall ingrowth deposition and suggests that STED-based approaches will be useful for more detailed morphological analysis of wall ingrowth formation. These improvements in pseudo-Schiff labeling for conventional confocal microscopy and STED imaging will be broadly applicable for high-resolution imaging of plant cell walls.
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Affiliation(s)
- Angus E Rae
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
- Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Xiaoyang Wei
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Neftali Flores-Rodriguez
- Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney, NSW 2006, Australia
| | - David W McCurdy
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - David A Collings
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
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6
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Duffieux D, Marcus SE, Knox JP, Hervé C. Monoclonal Antibodies, Carbohydrate-Binding Modules, and Detection of Polysaccharides in Cell Walls from Plants and Marine Algae. Methods Mol Biol 2020; 2149:351-364. [PMID: 32617945 DOI: 10.1007/978-1-0716-0621-6_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Plant and algal cell walls are diverse composites of complex polysaccharides. Molecular probes such as monoclonal antibodies (MABs) and carbohydrate-binding modules (CBMs) are important tools to detect and dissect cell wall structures in these materials. We provide an account of methods that can be used to detect cell wall polysaccharide structures (epitopes) in plant and marine algal materials and also describe treatments that can provide information on the masking of polysaccharides that may prevent detection. These masking phenomena may indicate potential interactions between sets of cell wall polysaccharides and methods to uncover them are an important aspect of cell wall immunocytochemistry.
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Affiliation(s)
- Delphine Duffieux
- Station Biologique de Roscoff, Sorbonne Universités, CNRS, Integrative Biology of Marine Models (LBI2M), Roscoff, France
| | - Susan E Marcus
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK
| | - J Paul Knox
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK
| | - Cécile Hervé
- Station Biologique de Roscoff, Sorbonne Universités, CNRS, Integrative Biology of Marine Models (LBI2M), Roscoff, France.
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7
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Fitzek E, Balazic R, Yin Y. Bioinformatics Analysis of Plant Cell Wall Evolution. Methods Mol Biol 2020; 2149:483-502. [PMID: 32617952 DOI: 10.1007/978-1-0716-0621-6_27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In the past hundreds of millions of years, from green algae to land plants, cell walls have developed into a highly complex structure that is essential for plant growth and survival. Plant cell wall diversity and evolution can be directly investigated by chemically profiling polysaccharides and lignins in the cell walls of diverse plants and algae. With the increasingly low cost and high throughput of DNA sequencing technologies, cell wall evolution can also be studied by bioinformatics analysis of the occurrence of cell wall synthesis-related enzymes in the genomes and transcriptomes of different species. This chapter presents a bioinformatics workflow running on a Linux platform to process genomic data for such gene occurrence analysis. As a case study, cellulose synthase (CesA) and CesA-like (Csl) protein families are mined for in two newly sequenced organisms: the charophyte green alga Klebsormidium flaccidum (renamed as Klebsormidium nitens) and the fern Lygodium japonicum.
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Affiliation(s)
- Elisabeth Fitzek
- Department of Biological Sciences, Northern Illinois University, DeKalb, IL, USA
| | - Rhiannon Balazic
- Department of Biological Sciences, Northern Illinois University, DeKalb, IL, USA
| | - Yanbin Yin
- Department of Biological Sciences, Northern Illinois University, DeKalb, IL, USA.
- Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE, USA.
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8
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Uluisik S, Seymour GB. Pectate lyases: Their role in plants and importance in fruit ripening. Food Chem 2019; 309:125559. [PMID: 31679850 DOI: 10.1016/j.foodchem.2019.125559] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 09/12/2019] [Accepted: 09/16/2019] [Indexed: 11/25/2022]
Abstract
Plant cell walls are complex structures that are modified throughout development. They are a major contributor to the properties of plant structure and act as barriers against pathogens. The primary cell walls of plants are composed of polysaccharides and proteins. The polysaccharide fraction is divided into components cellulose, hemicelluloses and pectin, are all modified during fruit ripening. Pectin plays an important role in intercellular adhesion and controlling the porosity of the wall. A large number of pectin degrading enzymes have been characterised from plants and they are involved in numerous aspects of plant development. The role of pectate lyases in plant development has received little attention, probably because they are normally associated with the action of plant pathogenic organisms. However their importance in plant development and ripening is now becoming well established and new information about the role of pectate lyases in plant development forms the focus of this review.
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Affiliation(s)
- Selman Uluisik
- Burdur Mehmet Akif Ersoy University, Burdur Food Agriculture and Livestock Vocational School, 15030 Burdur, Turkey.
| | - Graham B Seymour
- Nottinham University, Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington, Loughborough LE12, UK.
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9
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Williams BA, Mikkelsen D, Flanagan BM, Gidley MJ. "Dietary fibre": moving beyond the "soluble/insoluble" classification for monogastric nutrition, with an emphasis on humans and pigs. J Anim Sci Biotechnol 2019; 10:45. [PMID: 31149336 PMCID: PMC6537190 DOI: 10.1186/s40104-019-0350-9] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Accepted: 03/29/2019] [Indexed: 12/22/2022] Open
Abstract
This review describes dietary fibres originating from a range of foods, particularly in relation to their plant cell walls. It explores the categorization of dietary fibres into “soluble” or “insoluble”. It also emphasizes dietary fibre fermentability, in terms of describing how the gastro-intestinal tract (GIT) microbiota respond to a selection of fibres from these categories. Food is categorized into cereals, legumes, fruits and vegetables. Mention is also made of example whole foods and why differences in physico-chemical characteristics between “purified” and “non-purified” food components are important in terms of health. Lastly, recommendations are made as to how dietary fibre could be classified differently, in relation to its functionality in terms of fermentability, rather than only its solubility.
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Affiliation(s)
- Barbara A Williams
- The University of Queensland, QAAFI Centre for Nutrition and Food Sciences, St. Lucia campus, Brisbane, Qld 4070 Australia
| | - Deirdre Mikkelsen
- The University of Queensland, QAAFI Centre for Nutrition and Food Sciences, St. Lucia campus, Brisbane, Qld 4070 Australia
| | - Bernadine M Flanagan
- The University of Queensland, QAAFI Centre for Nutrition and Food Sciences, St. Lucia campus, Brisbane, Qld 4070 Australia
| | - Michael J Gidley
- The University of Queensland, QAAFI Centre for Nutrition and Food Sciences, St. Lucia campus, Brisbane, Qld 4070 Australia
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10
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Jeong HY, Nguyen HP, Eom SH, Lee C. Integrative analysis of pectin methylesterase (PME) and PME inhibitors in tomato (Solanum lycopersicum): Identification, tissue-specific expression, and biochemical characterization. Plant Physiol Biochem 2018; 132:557-565. [PMID: 30326434 DOI: 10.1016/j.plaphy.2018.10.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 10/08/2018] [Accepted: 10/08/2018] [Indexed: 06/08/2023]
Abstract
Although previous studies have demonstrated that the degree of demethylesterification of pectin polysaccharides is modulated during tomato fruit ripening, its involvement in vegetative organ development has been seldom investigated. As a first step in understanding the importance of pectin modification during vegetative stages, we used chemical, biochemical, and molecular approaches to analyze PMEs and PMEIs in tomato plants. We found that tomato cell walls isolated from vegetative tissues as well as the fruit contain substantial quantities of pectin, and different degrees of methylesterification were evident in different tissues. Our chemical study was further substantiated by immunolocalization analysis, which showed that selective removal of pectin-bound methyl groups is required for proper organ development and growth. In the tomato genome, there exists 79 PMEs and 48 PMEIs with temporally and spatially regulated expression. As a case study, we showed that two tomato PMEIs (SolycPMEI13 and SolycPMEI14) exhibited PMEI activities. This is the first report regarding the genome-wide identification and expression profiling of PME/PMEIs in tomato and the first chemical evidence of the differential degrees of pectin methylesterification in vegetative and reproductive tissues. Taken together, our findings provide an important tool to unravel the molecular and physiological functions of tomato PME and PMEI in further study.
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Affiliation(s)
- Ho Young Jeong
- Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, South Korea
| | - Hong Phuong Nguyen
- Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, South Korea
| | - Seok Hyun Eom
- Department of Horticultural Biotechnology, Kyung Hee University, Yongin, 446-701, South Korea.
| | - Chanhui Lee
- Graduate School of Biotechnology, Kyung Hee University, Yongin, 446-701, South Korea; Department of Plant and Environmental New Resources, Kyung Hee University, Yongin, 446-701, South Korea.
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11
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Barnes WJ, Anderson CT. Release, Recycle, Rebuild: Cell-Wall Remodeling, Autodegradation, and Sugar Salvage for New Wall Biosynthesis during Plant Development. Mol Plant 2018; 11:31-46. [PMID: 28859907 DOI: 10.1016/j.molp.2017.08.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 08/16/2017] [Accepted: 08/21/2017] [Indexed: 05/20/2023]
Abstract
Plant cell walls contain elaborate polysaccharide networks and regulate plant growth, development, mechanics, cell-cell communication and adhesion, and defense. Despite conferring rigidity to support plant structures, the cell wall is a dynamic extracellular matrix that is modified, reorganized, and degraded to tightly control its properties during growth and development. Far from being a terminal carbon sink, many wall polymers can be degraded and recycled by plant cells, either via direct re-incorporation by transglycosylation or via internalization and metabolic salvage of wall-derived sugars to produce new precursors for wall synthesis. However, the physiological and metabolic contributions of wall recycling to plant growth and development are largely undefined. In this review, we discuss long-standing and recent evidence supporting the occurrence of cell-wall recycling in plants, make predictions regarding the developmental processes to which wall recycling might contribute, and identify outstanding questions and emerging experimental tools that might be used to address these questions and enhance our understanding of this poorly characterized aspect of wall dynamics and metabolism.
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Affiliation(s)
- William J Barnes
- Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA; Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University Park, PA 16802, USA
| | - Charles T Anderson
- Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA; Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University Park, PA 16802, USA.
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12
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Williams DL, Crowe JD, Ong RG, Hodge DB. Water sorption in pretreated grasses as a predictor of enzymatic hydrolysis yields. Bioresour Technol 2017; 245:242-249. [PMID: 28892697 DOI: 10.1016/j.biortech.2017.08.200] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 08/29/2017] [Accepted: 08/30/2017] [Indexed: 05/05/2023]
Abstract
This work investigated the impact of two alkaline pretreatments, ammonia fiber expansion (AFEX) and alkaline hydrogen peroxide (AHP) delignification performed over a range of conditions on the properties of corn stover and switchgrass. Changes in feedstock properties resulting from pretreatment were subsequently compared to enzymatic hydrolysis yields to examine the relationship between enzymatic hydrolysis and cell wall properties. The pretreatments function to increase enzymatic hydrolysis yields through different mechanisms; AFEX pretreatment through lignin relocalization and some xylan solubilization and AHP primarily through lignin solubilization. An important outcome of this work demonstrated that while changes in lignin content in AHP-delignified biomass could be clearly correlated to improved response to hydrolysis, compositional changes alone in AFEX-pretreated biomass could not explain differences in hydrolysis yields. We determined the water retention value, which characterizes the association of water with the cell wall of the pretreated biomass, can be used to predict hydrolysis yields for all pretreated biomass within this study.
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Affiliation(s)
- Daniel L Williams
- Department of Chemical Engineering & Materials Science, Michigan State University, East Lansing, MI, USA; DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI, USA
| | - Jacob D Crowe
- Department of Chemical Engineering & Materials Science, Michigan State University, East Lansing, MI, USA
| | - Rebecca G Ong
- Department of Chemical Engineering, Michigan Technological University, Houghton, MI, USA
| | - David B Hodge
- Department of Chemical Engineering & Materials Science, Michigan State University, East Lansing, MI, USA; DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI, USA; Department Biosystems & Agricultural Engineering, Michigan State University, East Lansing, MI, USA; Division of Chemical Engineering. Luleå University of Technology, SE-971 87 Luleå, Sweden.
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13
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Keadtidumrongkul P, Suttangkakul A, Pinmanee P, Pattana K, Kittiwongwattana C, Apisitwanich S, Vuttipongchaikij S. Growth modulation effects of CBM2a under the control of AtEXP4 and CaMV35S promoters in Arabidopsis thaliana, Nicotiana tabacum and Eucalyptus camaldulensis. Transgenic Res 2017; 26:447-463. [PMID: 28349287 DOI: 10.1007/s11248-017-0015-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 03/21/2017] [Indexed: 11/29/2022]
Abstract
The expression of cell-wall-targeted Carbohydrate Binding Modules (CBMs) can alter cell wall properties and modulate growth and development in plants such as tobacco and potato. CBM2a identified in xylanase 10A from Cellulomonas fimi is of particular interest for its ability to bind crystalline cellulose. However, its potential for promoting plant growth has not been explored. In this work, we tested the ability of CBM2a to promote growth when expressed using both CaMV35S and a vascular tissue-specific promoter derived from Arabidopsis expansin4 (AtEXP4) in three plant species: Arabidopsis, Nicotiana tabacum and Eucalyptus camaldulensis. In Arabidopsis, the expression of AtEXP4pro:CBM2a showed trends for growth promoting effects including the increase of root and hypocotyl lengths and the enlargements of the vascular xylem area, fiber cells and vessel cells. However, in N. tabacum, the expression of CBM2a under the control of either CaMV35S or AtEXP4 promoter resulted in subtle changes in the plant growth, and the thickness of secondary xylem and vessel and fiber cell sizes were generally reduced in the transgenic lines with AtEXP4pro:CBM2a. In Eucalyptus, while transgenics expressing CaMV35S:CBM2a showed very subtle changes compared to wild type, those transgenics with AtEXP4pro:CBM2a showed increases in plant height, enlargement of xylem areas and xylem fiber and vessel cells. These data provide comparative effects of expressing CBM2a protein in different plant species, and this finding can be applied for plant biomass improvement.
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Affiliation(s)
- Pornthep Keadtidumrongkul
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
| | - Anongpat Suttangkakul
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
- Special Research Unit in Microalgal Molecular Genetics and Functional Genomics (MMGFG), Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
- Center of Advanced Studies for Tropical Natural Resources, Kasetsart University, 50 Ngam Wong Wan, Chatuchak, Bangkok, 10900, Thailand
| | - Phitsanu Pinmanee
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
| | - Kanokwan Pattana
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
| | - Chokchai Kittiwongwattana
- Department of Biology, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520, Thailand
| | - Somsak Apisitwanich
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
- Special Research Unit in Microalgal Molecular Genetics and Functional Genomics (MMGFG), Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand
- Center of Advanced Studies for Tropical Natural Resources, Kasetsart University, 50 Ngam Wong Wan, Chatuchak, Bangkok, 10900, Thailand
- School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand
| | - Supachai Vuttipongchaikij
- Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand.
- Special Research Unit in Microalgal Molecular Genetics and Functional Genomics (MMGFG), Department of Genetics, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok, 10900, Thailand.
- Center of Advanced Studies for Tropical Natural Resources, Kasetsart University, 50 Ngam Wong Wan, Chatuchak, Bangkok, 10900, Thailand.
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14
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Chen D, Harris PJ, Sims IM, Zujovic Z, Melton LD. Polysaccharide compositions of collenchyma cell walls from celery (Apium graveolens L.) petioles. BMC Plant Biol 2017; 17:104. [PMID: 28619057 PMCID: PMC5472923 DOI: 10.1186/s12870-017-1046-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 05/24/2017] [Indexed: 05/09/2023]
Abstract
BACKGROUND Collenchyma serves as a mechanical support tissue for many herbaceous plants. Previous work based on solid-state NMR and immunomicroscopy suggested collenchyma cell walls (CWs) may have similar polysaccharide compositions to those commonly found in eudicotyledon parenchyma walls, but no detailed chemical analysis was available. In this study, compositions and structures of cell wall polysaccharides of peripheral collenchyma from celery petioles were investigated. RESULTS This is the first detailed investigation of the cell wall composition of collenchyma from any plant. Celery petioles were found to elongate throughout their length during early growth, but as they matured elongation was increasingly confined to the upper region, until elongation ceased. Mature, fully elongated, petioles were divided into three equal segments, upper, middle and lower, and peripheral collenchyma strands isolated from each. Cell walls (CWs) were prepared from the strands, which also yielded a HEPES buffer soluble fraction. The CWs were sequentially extracted with CDTA, Na2CO3, 1 M KOH and 4 M KOH. Monosaccharide compositions of the CWs showed that pectin was the most abundant polysaccharide [with homogalacturonan (HG) more abundant than rhamnogalacturonan I (RG-I) and rhamnogalacturonan II (RG-II)], followed by cellulose, and other polysaccharides, mainly xyloglucans, with smaller amounts of heteroxylans and heteromannans. CWs from different segments had similar compositions, but those from the upper segments had slightly more pectin than those from the lower two segments. Further, the pectin in the CWs of the upper segment had a higher degree of methyl esterification than the other segments. In addition to the anticipated water-soluble pectins, the HEPES-soluble fractions surprisingly contained large amounts of heteroxylans. The CDTA and Na2CO3 fractions were rich in HG and RG-I, the 1 M KOH fraction had abundant heteroxylans, the 4 M KOH fraction was rich in xyloglucan and heteromannans, and cellulose was predominant in the final residue. The structures of the xyloglucans, heteroxylans and heteromannans were deduced from the linkage analysis and were similar to those present in most eudicotyledon parenchyma CWs. Cross polarization with magic angle spinning (CP/MAS) NMR spectroscopy showed no apparent difference in the rigid and semi-rigid polysaccharides in the CWs of the three segments. Single-pulse excitation with magic-angle spinning (SPE/MAS) NMR spectroscopy, which detects highly mobile polysaccharides, showed the presence of arabinan, the detailed structure of which varied among the cell walls from the three segments. CONCLUSIONS Celery collenchyma CWs have similar polysaccharide compositions to most eudicotyledon parenchyma CWs. However, celery collenchyma CWs have much higher XG content than celery parenchyma CWs. The degree of methyl esterification of pectin and the structures of the arabinan side chains of RG-I show some variation in the collenchyma CWs from the different segments. Unexpectedly, the HEPES-soluble fraction contained a large amount of heteroxylans.
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Affiliation(s)
- Da Chen
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Philip J. Harris
- School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Ian M. Sims
- Ferrier Research Institute, Victoria University of Wellington, Wellington, New Zealand
| | - Zoran Zujovic
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
- NMR Centre, School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Laurence D. Melton
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
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Barnes WJ, Anderson CT. Acetyl Bromide Soluble Lignin (ABSL) Assay for Total Lignin Quantification from Plant Biomass. Bio Protoc 2017; 7:e2149. [PMID: 34458465 DOI: 10.21769/bioprotoc.2149] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/05/2016] [Accepted: 02/03/2017] [Indexed: 11/02/2022] Open
Abstract
Lignin is the second most abundant biopolymer on Earth, providing plants with mechanical support in secondary cell walls and defense against abiotic and biotic stresses. However, lignin also acts as a barrier to biomass saccharification for biofuel generation (Carroll and Somerville, 2009; Zhao and Dixon, 2011; Wang et al., 2013 ). For these reasons, studying the properties of lignin is of great interest to researchers in agriculture and bioenergy fields. This protocol describes the acetyl bromide method of total lignin extraction and quantification, which is favored among other methods for its high recovery, consistency, and insensitivity to different tissue types ( Johnson et al., 1961 ; Chang et al., 2008 ; Moreira- Vilar et al., 2014 ; Kapp et al., 2015 ). In brief, acetyl bromide digestion causes the formation of acetyl derivatives on free hydroxyl groups and bromide substitution of α-carbon hydroxyl groups on the lignin backbone to cause a complete solubilization of lignin, which can be quantified using known extinction coefficients and absorbance at 280 nm (Moreira- Vilar et al., 2014 ).
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Affiliation(s)
- William J Barnes
- Department of Biology, The Pennsylvania State University, University Park, PA, USA.,Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University Park, PA, USA
| | - Charles T Anderson
- Department of Biology, The Pennsylvania State University, University Park, PA, USA.,Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University Park, PA, USA
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16
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Kračun SK, Fangel JU, Rydahl MG, Pedersen HL, Vidal-Melgosa S, Willats WGT. Carbohydrate Microarray Technology Applied to High-Throughput Mapping of Plant Cell Wall Glycans Using Comprehensive Microarray Polymer Profiling (CoMPP). Methods Mol Biol 2017; 1503:147-165. [PMID: 27743365 DOI: 10.1007/978-1-4939-6493-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cell walls are an important feature of plant cells and a major component of the plant glycome. They have both structural and physiological functions and are critical for plant growth and development. The diversity and complexity of these structures demand advanced high-throughput techniques to answer questions about their structure, functions and roles in both fundamental and applied scientific fields. Microarray technology provides both the high-throughput and the feasibility aspects required to meet that demand. In this chapter, some of the most recent microarray-based techniques relating to plant cell walls are described together with an overview of related contemporary techniques applied to carbohydrate microarrays and their general potential in glycoscience. A detailed experimental procedure for high-throughput mapping of plant cell wall glycans using the comprehensive microarray polymer profiling (CoMPP) technique is included in the chapter and provides a good example of both the robust and high-throughput nature of microarrays as well as their applicability to plant glycomics.
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Affiliation(s)
- Stjepan Krešimir Kračun
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark.
| | - Jonatan Ulrik Fangel
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
| | - Maja Gro Rydahl
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
| | - Henriette Lodberg Pedersen
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
| | - Silvia Vidal-Melgosa
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
| | - William George Tycho Willats
- Section for Plant Glycobiology, Department for Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
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17
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Nguyen HP, Jeong HY, Jeon SH, Kim D, Lee C. Rice pectin methylesterase inhibitor28 (OsPMEI28) encodes a functional PMEI and its overexpression results in a dwarf phenotype through increased pectin methylesterification levels. J Plant Physiol 2017; 208:17-25. [PMID: 27889517 DOI: 10.1016/j.jplph.2016.11.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Revised: 10/30/2016] [Accepted: 11/14/2016] [Indexed: 05/02/2023]
Abstract
Pectin methylesterases (PMEs, EC 3.1.1.11) belonging to carbohydrate esterase family 8 cleave the ester bond between a galacturonic acid and an methyl group and the resulting change in methylesterification level plays an important role during the growth and development of plants. Optimal pectin methylesterification status in each cell type is determined by the balance between PME activity and post-translational PME inhibition by PME inhibitors (PMEIs). Rice contains 49 PMEIs and none of them are functionally characterized. Genomic sequence analysis led to the identification of rice PMEI28 (OsPMEI28). Recombinant OsPMEI28 exhibited inhibitory activity against commercial PME protein with the highest activities detected at pH 8.5. Overexpression of OsPMEI28 in rice resulted in an increased level of cell wall bound methylester groups and differential changes in the composition of cell wall neutral monosaccharides and lignin content in culm tissues. Consequently, transgenic plants overexpressing OsPMEI28 exhibited dwarf phenotypes and reduced culm diameter. Our data indicate that OsPMEI28 functions as a critical structural modulator by regulating the degree of pectin methylesterification and that an impaired status of pectin methylesterification affects physiochemical properties of the cell wall components and causes abnormal cell extensibility in rice culm tissues.
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Affiliation(s)
- Hong Phuong Nguyen
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Ho Young Jeong
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Seung Ho Jeon
- Seed Research Center, Gyeongnam National University of Science and Technology, Jinju-Si 52725, Republic of Korea
| | - Donghyuk Kim
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Chanhui Lee
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea; Department of Plant and Environmental New Resources, Kyung Hee University, Yongin 446-701, Republic of Korea.
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18
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Zhang M, Chavan RR, Smith BG, McArdle BH, Harris PJ. Tracheid cell-wall structures and locations of (1 → 4)-β-D-galactans and (1 → 3)-β-D-glucans in compression woods of radiata pine (Pinus radiata D. Don). BMC Plant Biol 2016; 16:194. [PMID: 27604684 PMCID: PMC5015220 DOI: 10.1186/s12870-016-0884-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 08/25/2016] [Indexed: 05/12/2023]
Abstract
BACKGROUND Compression wood (CW) forms on the underside of tilted stems of coniferous gymnosperms and opposite wood (OW) on the upperside. The tracheid walls of these wood types differ structurally and chemically. Although much is known about the most severe form of CW, severe CW (SCW), mild CWs (MCWs), also occur, but less is known about them. In this study, tracheid wall structures and compositions of two grades of MCWs (1 and 2) and SCW were investigated and compared with OW in slightly tilted radiata pine (Pinus radiata) stems. RESULTS The four wood types were identified by the distribution of lignin in their tracheid walls. Only the tracheid walls of OW and MCW1 had a S3 layer and this was thin in MCW1. The tracheid walls of only SCW had a S2 layer with helical cavities in the inner region (S2i). Using immunomicroscopy, (1 → 4)-β-D-galactans and (1 → 3)-β-D-glucans were detected in the tracheid walls of all CWs, but in only trace amounts in OW. The (1 → 4)-β-D-galactans were located in the outer region of the S2 layer, whereas the (1 → 3)-β-D-glucans were in the inner S2i region. The areas and intensities of labelling increased with CW severity. The antibody for (1 → 4)-β-D-galactans was also used to identify the locations and relative amounts of these galactans in whole stem cross sections based on the formation of an insoluble dye. Areas containing the four wood types were clearly differentiated depending on colour intensity. The neutral monosaccharide compositions of the non-cellulosic polysaccharides of these wood types were determined on small, well defined discs, and showed the proportion of galactose was higher for CWs and increased with severity. CONCLUSION The presence of an S3 wall layer is a marker for very MCW and the presence of helical cavities in the S2 wall layer for SCW. The occurrence and proportions of (1 → 4)-β-D-galactans and (1 → 3)-β-D-glucans can be used as markers for CW and its severity. The proportions of galactose were consistent with the labelling results for (1 → 4)-β-D-galactans.
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Affiliation(s)
- Miao Zhang
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142 New Zealand
| | - Ramesh R. Chavan
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142 New Zealand
| | - Bronwen G. Smith
- School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142 New Zealand
| | - Brian H. McArdle
- Department of Statistics, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142 New Zealand
| | - Philip J. Harris
- School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland, 1142 New Zealand
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19
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Abstract
Plants must meet mechanical as well as physiological and reproductive requirements for survival. Management of internal and external stresses is achieved through their unique hierarchical architecture. Stiffness is determined by a combination of morphological (geometrical) and compositional variables that vary across multiple length scales ranging from the whole plant to organ, tissue, cell and cell wall levels. These parameters include, among others, organ diameter, tissue organization, cell size, density and turgor pressure, and the thickness and composition of cell walls. These structural parameters and their consequences on plant stiffness are reviewed in the context of work on stems of the genetic reference plant Arabidopsis thaliana (Arabidopsis), and the suitability of Arabidopsis as a model system for consistent investigation of factors controlling plant stiffness is put forward. Moving beyond Arabidopsis, the presence of morphological parameters causing stiffness gradients across length-scales leads to beneficial emergent properties such as increased load-bearing capacity and reversible actuation. Tailoring of plant stiffness for old and new purposes in agriculture and forestry can be achieved through bioengineering based on the knowledge of the morphological and compositional parameters of plant stiffness in combination with gene identification through the use of genetics.
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Affiliation(s)
- Veronique Brulé
- Department of Biology, McGill University, 1205 Docteur Penfield Ave., Montreal, QC, H3A 1B1, Canada.
| | - Ahmad Rafsanjani
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC, H3A OC3, Canada.
| | - Damiano Pasini
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC, H3A OC3, Canada.
| | - Tamara L Western
- Department of Biology, McGill University, 1205 Docteur Penfield Ave., Montreal, QC, H3A 1B1, Canada.
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20
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Grundy MML, Edwards CH, Mackie AR, Gidley MJ, Butterworth PJ, Ellis PR. Re-evaluation of the mechanisms of dietary fibre and implications for macronutrient bioaccessibility, digestion and postprandial metabolism. Br J Nutr 2016; 116:816-33. [PMID: 27385119 PMCID: PMC4983777 DOI: 10.1017/s0007114516002610] [Citation(s) in RCA: 188] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 06/01/2016] [Accepted: 06/08/2016] [Indexed: 02/06/2023]
Abstract
The positive effects of dietary fibre on health are now widely recognised; however, our understanding of the mechanisms involved in producing such benefits remains unclear. There are even uncertainties about how dietary fibre in plant foods should be defined and analysed. This review attempts to clarify the confusion regarding the mechanisms of action of dietary fibre and deals with current knowledge on the wide variety of dietary fibre materials, comprising mainly of NSP that are not digested by enzymes of the gastrointestinal (GI) tract. These non-digestible materials range from intact cell walls of plant tissues to individual polysaccharide solutions often used in mechanistic studies. We discuss how the structure and properties of fibre are affected during food processing and how this can impact on nutrient digestibility. Dietary fibre can have multiple effects on GI function, including GI transit time and increased digesta viscosity, thereby affecting flow and mixing behaviour. Moreover, cell wall encapsulation influences macronutrient digestibility through limited access to digestive enzymes and/or substrate and product release. Moreover, encapsulation of starch can limit the extent of gelatinisation during hydrothermal processing of plant foods. Emphasis is placed on the effects of diverse forms of fibre on rates and extents of starch and lipid digestion, and how it is important that a better understanding of such interactions with respect to the physiology and biochemistry of digestion is needed. In conclusion, we point to areas of further investigation that are expected to contribute to realisation of the full potential of dietary fibre on health and well-being of humans.
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Affiliation(s)
- Myriam M.-L. Grundy
- Biopolymers Group, Diabetes and Nutritional Sciences Division, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Cathrina H. Edwards
- Biopolymers Group, Diabetes and Nutritional Sciences Division, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
- Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK
| | - Alan R. Mackie
- Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK
| | - Michael J. Gidley
- ARC Centre of Excellence in Plant Cell Walls, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane 4072, Qsd, Australia
| | - Peter J. Butterworth
- Biopolymers Group, Diabetes and Nutritional Sciences Division, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
| | - Peter R. Ellis
- Biopolymers Group, Diabetes and Nutritional Sciences Division, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK
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21
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Wang Y, Fan C, Hu H, Li Y, Sun D, Wang Y, Peng L. Genetic modification of plant cell walls to enhance biomass yield and biofuel production in bioenergy crops. Biotechnol Adv 2016; 34:997-1017. [PMID: 27269671 DOI: 10.1016/j.biotechadv.2016.06.001] [Citation(s) in RCA: 136] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 05/31/2016] [Accepted: 06/01/2016] [Indexed: 02/06/2023]
Abstract
Plant cell walls represent an enormous biomass resource for the generation of biofuels and chemicals. As lignocellulose property principally determines biomass recalcitrance, the genetic modification of plant cell walls has been posed as a powerful solution. Here, we review recent progress in understanding the effects of distinct cell wall polymers (cellulose, hemicelluloses, lignin, pectin, wall proteins) on the enzymatic digestibility of biomass under various physical and chemical pretreatments in herbaceous grasses, major agronomic crops and fast-growing trees. We also compare the main factors of wall polymer features, including cellulose crystallinity (CrI), hemicellulosic Xyl/Ara ratio, monolignol proportion and uronic acid level. Furthermore, the review presents the main gene candidates, such as CesA, GH9, GH10, GT61, GT43 etc., for potential genetic cell wall modification towards enhancing both biomass yield and enzymatic saccharification in genetic mutants and transgenic plants. Regarding cell wall modification, it proposes a novel groove-like cell wall model that highlights to increase amorphous regions (density and depth) of the native cellulose microfibrils, providing a general strategy for bioenergy crop breeding and biofuel processing technology.
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Affiliation(s)
- Yanting Wang
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Chunfen Fan
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Huizhen Hu
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ying Li
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Dan Sun
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; College of Chemistry and Chemical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
| | - Youmei Wang
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Liangcai Peng
- Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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22
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Nguyen HP, Jeong HY, Kim H, Kim YC, Lee C. Molecular and biochemical characterization of rice pectin methylesterase inhibitors (OsPMEIs). Plant Physiol Biochem 2016; 101:105-112. [PMID: 26874295 DOI: 10.1105/10.1016/j.plaphy.2016.01.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 01/23/2016] [Accepted: 01/28/2016] [Indexed: 05/18/2023]
Abstract
Cell wall modifications such as partial degradation and depolymerization by cell wall hydrolases are normal cellular processes and are required for the functionalities of different cell types. Pectin, one of the major cell wall polysaccharides, is predominantly found in primary cell walls and middle lamellae and is subjected to in muro modification, primarily by cell wall-localized pectin methylesterases (PMEs). Molecular biochemical studies have demonstrated that enzymatic activities of PMEs are governed by multiple pectin methylesterase inhibitors (PMEIs), which consequently control the pectin methylesterification status. Although a few studies in Arabidopsis have shown the importance of this PMEI-mediated regulation in the biophysical properties of cell walls, little is known about the molecular physiological functions of rice PMEIs. We found 49 members of the PMEI family in the rice genome. Analysis of their transcript levels by quantitative real-time PCR and meta expression analysis showed that they are regulated spatially and temporally, as well as in response to diverse stresses. Quantification of cell wall-bound methylesters indicated that the degree of pectin methylesterification is developmentally regulated; in particular, higher PMEI activities were detected in cell wall proteins prepared from young leaves. Furthermore, an activity assay demonstrated that two recombinant OsPMEI proteins (OsPMEI8 and 12) were able to inhibit the enzymatic activity of a commercial PME protein. Subcellular localization indicated that OsPMEI8 is targeted to the middle lamella and OsPMEI12 is localized in the plasma membrane and nucleus. Taken together, our findings provide the first molecular and biochemical evidence for functional characterization of PMEIs in rice growth and development.
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Affiliation(s)
- Hong Phuong Nguyen
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea
| | - Ho Young Jeong
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea
| | - Hun Kim
- Center for Eco-Friendly New Materials, Korea Research Institute of Chemical Technology, Daejeon 305-600, South Korea
| | - Young Chang Kim
- Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, Rural Development Administration, Eumseong 27709, South Korea.
| | - Chanhui Lee
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea; Department of Plant and Environmental New Resources, Kyung Hee University, Yongin 446-701, South Korea.
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Nguyen HP, Jeong HY, Kim H, Kim YC, Lee C. Molecular and biochemical characterization of rice pectin methylesterase inhibitors (OsPMEIs). Plant Physiol Biochem 2016; 101:105-112. [PMID: 26874295 DOI: 10.1016/j.plaphy.2016.01.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 01/23/2016] [Accepted: 01/28/2016] [Indexed: 06/05/2023]
Abstract
Cell wall modifications such as partial degradation and depolymerization by cell wall hydrolases are normal cellular processes and are required for the functionalities of different cell types. Pectin, one of the major cell wall polysaccharides, is predominantly found in primary cell walls and middle lamellae and is subjected to in muro modification, primarily by cell wall-localized pectin methylesterases (PMEs). Molecular biochemical studies have demonstrated that enzymatic activities of PMEs are governed by multiple pectin methylesterase inhibitors (PMEIs), which consequently control the pectin methylesterification status. Although a few studies in Arabidopsis have shown the importance of this PMEI-mediated regulation in the biophysical properties of cell walls, little is known about the molecular physiological functions of rice PMEIs. We found 49 members of the PMEI family in the rice genome. Analysis of their transcript levels by quantitative real-time PCR and meta expression analysis showed that they are regulated spatially and temporally, as well as in response to diverse stresses. Quantification of cell wall-bound methylesters indicated that the degree of pectin methylesterification is developmentally regulated; in particular, higher PMEI activities were detected in cell wall proteins prepared from young leaves. Furthermore, an activity assay demonstrated that two recombinant OsPMEI proteins (OsPMEI8 and 12) were able to inhibit the enzymatic activity of a commercial PME protein. Subcellular localization indicated that OsPMEI8 is targeted to the middle lamella and OsPMEI12 is localized in the plasma membrane and nucleus. Taken together, our findings provide the first molecular and biochemical evidence for functional characterization of PMEIs in rice growth and development.
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Affiliation(s)
- Hong Phuong Nguyen
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea
| | - Ho Young Jeong
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea
| | - Hun Kim
- Center for Eco-Friendly New Materials, Korea Research Institute of Chemical Technology, Daejeon 305-600, South Korea
| | - Young Chang Kim
- Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, Rural Development Administration, Eumseong 27709, South Korea.
| | - Chanhui Lee
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, South Korea; Department of Plant and Environmental New Resources, Kyung Hee University, Yongin 446-701, South Korea.
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Hernandez-Gomez MC, Runavot JL, Guo X, Bourot S, Benians TAS, Willats WGT, Meulewaeter F, Knox JP. Heteromannan and Heteroxylan Cell Wall Polysaccharides Display Different Dynamics During the Elongation and Secondary Cell Wall Deposition Phases of Cotton Fiber Cell Development. Plant Cell Physiol 2015; 56:1786-97. [PMID: 26187898 PMCID: PMC4562070 DOI: 10.1093/pcp/pcv101] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/27/2015] [Indexed: 05/18/2023]
Abstract
The roles of non-cellulosic polysaccharides in cotton fiber development are poorly understood. Combining glycan microarrays and in situ analyses with monoclonal antibodies, polysaccharide linkage analyses and transcript profiling, the occurrence of heteromannan and heteroxylan polysaccharides and related genes in developing and mature cotton (Gossypium spp.) fibers has been determined. Comparative analyses on cotton fibers at selected days post-anthesis indicate different temporal and spatial regulation of heteromannan and heteroxylan during fiber development. The LM21 heteromannan epitope was more abundant during the fiber elongation phase and localized mainly in the primary cell wall. In contrast, the AX1 heteroxylan epitope occurred at the transition phase and during secondary cell wall deposition, and localized in both the primary and the secondary cell walls of the cotton fiber. These developmental dynamics were supported by transcript profiling of biosynthetic genes. Whereas our data suggest a role for heteromannan in fiber elongation, heteroxylan is likely to be involved in the regulation of cellulose deposition of secondary cell walls. In addition, the relative abundance of these epitopes during fiber development varied between cotton lines with contrasting fiber characteristics from four species (G. hirsutum, G. barbadense, G. arboreum and G. herbaceum), suggesting that these non-cellulosic polysaccharides may be involved in determining final fiber quality and suitability for industrial processing.
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Affiliation(s)
- Mercedes C Hernandez-Gomez
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK These authors contributed equally to this work
| | - Jean-Luc Runavot
- Bayer CropScience NV-Innovation Center, Technologiepark 38, 9052 Gent, Belgium These authors contributed equally to this work
| | - Xiaoyuan Guo
- Department of Plant and Environmental Sciences, University of CopenhagenThorvaldsensvej 40, 1871 Frederiksberg C, Copenhagen, Denmark
| | - Stéphane Bourot
- Bayer CropScience NV-Innovation Center, Technologiepark 38, 9052 Gent, Belgium
| | - Thomas A S Benians
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - William G T Willats
- Department of Plant and Environmental Sciences, University of CopenhagenThorvaldsensvej 40, 1871 Frederiksberg C, Copenhagen, Denmark
| | - Frank Meulewaeter
- Bayer CropScience NV-Innovation Center, Technologiepark 38, 9052 Gent, Belgium
| | - J Paul Knox
- Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
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25
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Jeong HY, Nguyen HP, Lee C. Genome-wide identification and expression analysis of rice pectin methylesterases: Implication of functional roles of pectin modification in rice physiology. J Plant Physiol 2015; 183:23-9. [PMID: 26072144 DOI: 10.1016/j.jplph.2015.05.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 05/09/2015] [Accepted: 05/10/2015] [Indexed: 05/19/2023]
Abstract
Pectin, which is enriched in primary cell walls and middle lamellae, is an essential polysaccharide in all higher plants. Homogalacturonans (HGA), a major form of pectin, are synthesized and methylesterified by enzymes localized in the Golgi apparatus and transported into the cell wall. Depending on cell type, the degree and pattern of pectin methylesterification are strictly regulated by cell wall-localized pectin methylesterases (PMEs). Despite its importance in plant development and growth, little is known about the physiological functions of pectin in rice, which contains 43 different types of PME. The presence of pectin in rice cell walls has been substantiated by uronic acid quantification and immunodetection of JIM7 monoclonal antibodies. We performed PME activity assays with cell wall proteins isolated from different rice tissues. In accordance with data from Arabidopsis, the highest activity was observed in germinating tissues, young culm, and spikelets, where cells are actively elongating. Transcriptional profiling of OsPMEs by real-time PCR and meta-analysis indicates that PMEs exhibit spatial- and stress-specific expression patterns during rice development. Based on in silico analysis, we identified subcellular compartments, isoelectric point, and cleavage sites of OsPMEs. Our findings provide an important tool for further studies seeking to unravel the functional importance of pectin modification during plant growth and abiotic and biotic responses of grass plants.
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Affiliation(s)
- Ho Young Jeong
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Hong Phuong Nguyen
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Chanhui Lee
- Graduate School of Biotechnology, Kyung Hee University, Yongin 446-701, Republic of Korea; Department of Plant and Environmental New Resources, Kyung Hee University, Yongin 446-701, Republic of Korea.
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26
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Grundy MML, Wilde PJ, Butterworth PJ, Gray R, Ellis PR. Impact of cell wall encapsulation of almonds on in vitro duodenal lipolysis. Food Chem 2015; 185:405-12. [PMID: 25952886 PMCID: PMC4430076 DOI: 10.1016/j.foodchem.2015.04.013] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 03/12/2015] [Accepted: 04/01/2015] [Indexed: 11/26/2022]
Abstract
Tissue microstructure controlled rate and extent of in vitro lipolysis in almonds. Lipolysis methods using pH-stat and GC analysis were in good agreement. Increasing lipid bioaccessibility led to increased levels of digestibility. Almond cell walls restrict lipid release, thus hindering digestion kinetics.
Although almonds have a high lipid content, their consumption is associated with reduced risk of cardiovascular disease. One explanation for this paradox could be limited bioaccessibility of almond lipids due to the cell wall matrix acting as a physical barrier to digestion in the upper gastrointestinal tract. We aimed to measure the rate and extent of lipolysis in an in vitro duodenum digestion model, using raw and roasted almond materials with potentially different degrees of bioaccessibility. The results revealed that a decrease in particle size led to an increased rate and extent of lipolysis. Particle size had a crucial impact on lipid bioaccessibility, since it is an indicator of the proportion of ruptured cells in the almond tissue. Separated almond cells with intact cell walls showed the lowest levels of digestibility. This study underlines the importance of the cell wall for modulating lipid uptake and hence the positive health benefits underlying almond consumption.
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Affiliation(s)
- Myriam M L Grundy
- King's College London, Diabetes and Nutritional Sciences Division, Biopolymers Group, Franklin-Wilkins Building, London SE1 9NH, UK.
| | - Peter J Wilde
- Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK.
| | - Peter J Butterworth
- King's College London, Diabetes and Nutritional Sciences Division, Biopolymers Group, Franklin-Wilkins Building, London SE1 9NH, UK.
| | - Robert Gray
- King's College London, Diabetes and Nutritional Sciences Division, Biopolymers Group, Franklin-Wilkins Building, London SE1 9NH, UK.
| | - Peter R Ellis
- King's College London, Diabetes and Nutritional Sciences Division, Biopolymers Group, Franklin-Wilkins Building, London SE1 9NH, UK.
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27
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Kračun SK, Schückel J, Westereng B, Thygesen LG, Monrad RN, Eijsink VGH, Willats WGT. A new generation of versatile chromogenic substrates for high-throughput analysis of biomass-degrading enzymes. Biotechnol Biofuels 2015; 8:70. [PMID: 25969695 PMCID: PMC4428106 DOI: 10.1186/s13068-015-0250-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 03/30/2015] [Indexed: 05/02/2023]
Abstract
BACKGROUND Enzymes that degrade or modify polysaccharides are widespread in pro- and eukaryotes and have multiple biological roles and biotechnological applications. Recent advances in genome and secretome sequencing, together with associated bioinformatic tools, have enabled large numbers of carbohydrate-acting enzymes to be putatively identified. However, there is a paucity of methods for rapidly screening the biochemical activities of these enzymes, and this is a serious bottleneck in the development of enzyme-reliant bio-refining processes. RESULTS We have developed a new generation of multi-coloured chromogenic polysaccharide and protein substrates that can be used in cheap, convenient and high-throughput multiplexed assays. In addition, we have produced substrates of biomass materials in which the complexity of plant cell walls is partially maintained. CONCLUSIONS We show that these substrates can be used to screen the activities of glycosyl hydrolases, lytic polysaccharide monooxygenases and proteases and provide insight into substrate availability within biomass. We envisage that the assays we have developed will be used primarily for first-level screening of large numbers of putative carbohydrate-acting enzymes, and the assays have the potential to be incorporated into fully or semi-automated robotic enzyme screening systems.
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Affiliation(s)
- Stjepan Krešimir Kračun
- />Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg, C 1871 Denmark
| | - Julia Schückel
- />Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg, C 1871 Denmark
| | - Bjørge Westereng
- />Department of Plant and Environmental Sciences, Thorvaldsensvej 40, Frederiksberg, C 1871 Denmark
- />Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Chr. M. Falsens vei 1., Aas, 1432 Norway
- />University of Copenhagen, Faculty of Science, Rolighedsvej 23, Frederiksberg, C 1958 Denmark
| | | | | | - Vincent G H Eijsink
- />Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Chr. M. Falsens vei 1., Aas, 1432 Norway
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Li Z, Bansal N, Azarpira A, Bhalla A, Chen CH, Ralph J, Hegg EL, Hodge DB. Chemical and structural changes associated with Cu-catalyzed alkaline-oxidative delignification of hybrid poplar. Biotechnol Biofuels 2015; 8:123. [PMID: 26300970 PMCID: PMC4546027 DOI: 10.1186/s13068-015-0300-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/30/2015] [Indexed: 05/11/2023]
Abstract
BACKGROUND Alkaline hydrogen peroxide pretreatment catalyzed by Cu(II) 2,2'-bipyridine complexes has previously been determined to substantially improve the enzymatic hydrolysis of woody plants including hybrid poplar as a consequence of moderate delignification. In the present work, cell wall morphological and lignin structural changes were characterized for this pretreatment approach to gain insights into pretreatment outcomes and, specifically, to identify the extent and nature of lignin modification. RESULTS Through TEM imaging, this catalytic oxidation process was shown to disrupt cell wall layers in hybrid poplar. Cu-containing nanoparticles, primarily in the Cu(I) oxidation state, co-localized with the disrupted regions, providing indirect evidence of catalytic activity whereby soluble Cu(II) complexes are reduced and precipitated during pretreatment. The concentration of alkali-soluble polymeric and oligomeric lignin was substantially higher for the Cu-catalyzed oxidative pretreatment. This alkali-soluble lignin content increased with time during the catalytic oxidation process, although the molecular weight distributions were unaltered. Yields of aromatic monomers (including phenolic acids and aldehydes) were found to be less than 0.2 % (wt/wt) on lignin. Oxidation of the benzylic alcohol in the lignin side-chain was evident in NMR spectra of the solubilized lignin, whereas minimal changes were observed for the pretreatment-insoluble lignin. CONCLUSIONS These results provide indirect evidence for catalytic activity within the cell wall. The low yields of lignin-derived aromatic monomers, together with the detailed characterization of the pretreatment-soluble and pretreatment-insoluble lignins, indicate that the majority of both lignin pools remained relatively unmodified. As such, the lignins resulting from this process retain features closely resembling native lignins and may, therefore, be amenable to subsequent valorization.
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Affiliation(s)
- Zhenglun Li
- />Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI USA
- />DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
- />College of Agricultural Sciences, Oregon State University, Corvallis, OR USA
| | - Namita Bansal
- />DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
- />Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI USA
| | - Ali Azarpira
- />DOE-Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI USA
| | - Aditya Bhalla
- />DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
- />Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI USA
| | - Charles H Chen
- />Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI USA
- />Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD USA
| | - John Ralph
- />DOE-Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI USA
- />Department of Biochemistry, University of Wisconsin, Madison, WI USA
| | - Eric L Hegg
- />DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
- />Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI USA
| | - David B Hodge
- />Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI USA
- />DOE-Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
- />Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, WI USA
- />Division of Sustainable Process Engineering, Luleå University of Technology, Luleå, Sweden
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29
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Zhou LH, Weizbauer RA, Singamaneni S, Xu F, Genin GM, Pickard BG. Structures formed by a cell membrane-associated arabinogalactan-protein on graphite or mica alone and with Yariv phenylglycosides. Ann Bot 2014; 114:1385-97. [PMID: 25164699 PMCID: PMC4195565 DOI: 10.1093/aob/mcu172] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 07/03/2014] [Indexed: 05/10/2023]
Abstract
BACKGROUND Certain membrane-associated arabinogalactan-proteins (AGPs) with lysine-rich sub-domains participate in plant growth, development and resistance to stress. To complement fluorescence imaging of such molecules when tagged and introduced transgenically to the cell periphery and to extend the groundwork for assessing molecular structure, some behaviours of surface-spread AGPs were visualized at the nanometre scale in a simplified electrostatic environment. METHODS Enhanced green fluorescent protein (EGFP)-labelled LeAGP1 was isolated from Arabidopsis thaliana leaves using antibody-coated magnetic beads, deposited on graphite or mica, and examined with atomic force microscopy (AFM). KEY RESULTS When deposited at low concentration on graphite, LeAGP can form independent clusters and rings a few nanometres in diameter, often defining deep pits; the aperture of the rings depends on plating parameters. On mica, intermediate and high concentrations, respectively, yielded lacy meshes and solid sheets that could dynamically evolve arcs, rings, 'pores' and 'co-pores', and pits. Glucosyl Yariv reagent combined with the AGP to make very large and distinctive rings. CONCLUSIONS Diverse cell-specific nano-patterns of native lysine-rich AGPs are expected at the wall-membrane interface and, while there will not be an identical patterning in different environmental settings, AFM imaging suggests protein tendencies for surficial organization and thus opens new avenues for experimentation. Nanopore formation with Yariv reagents suggests how the reagent might bind with AGP to admit Ca(2+) to cells and hints at ways in which AGP might be structured at some cell surfaces.
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Affiliation(s)
- Li Hong Zhou
- Gladys Levis Allen Laboratory of Plant Sensory Physiology, Biology Department, Washington University in St. Louis, St. Louis, MO, USA Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, USA Biomedical Engineering & Biomechanics Center, Xi'an Jiaotong University, Xi'an, China
| | - Renate A Weizbauer
- Gladys Levis Allen Laboratory of Plant Sensory Physiology, Biology Department, Washington University in St. Louis, St. Louis, MO, USA Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, USA Carnegie Institution, Department of Plant Biology, Stanford, CA, USA
| | - Srikanth Singamaneni
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, USA
| | - Feng Xu
- Biomedical Engineering & Biomechanics Center, Xi'an Jiaotong University, Xi'an, China School of Life Science & Technology, Xi'an Jiaotong University, Xi'an, China
| | - Guy M Genin
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, USA
| | - Barbara G Pickard
- Gladys Levis Allen Laboratory of Plant Sensory Physiology, Biology Department, Washington University in St. Louis, St. Louis, MO, USA
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Kozlova LV, Ageeva MV, Ibragimova NN, Gorshkova TA. Arrangement of mixed-linkage glucan and glucuronoarabinoxylan in the cell walls of growing maize roots. Ann Bot 2014; 114:1135-45. [PMID: 25086589 PMCID: PMC4195558 DOI: 10.1093/aob/mcu125] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 05/01/2014] [Indexed: 05/08/2023]
Abstract
BACKGROUND AND AIMS Plant cell enlargement is unambiguously coupled to changes in cell wall architecture, and as such various studies have examined the modification of the proportions and structures of glucuronoarabinoxylan and mixed-linkage glucan in the course of cell elongation in grasses. However, there is still no clear understanding of the mutual arrangement of these matrix polymers with cellulose microfibrils and of the modification of this architecture during cell growth. This study aimed to determine the correspondence between the fine structure of grass cell walls and the course of the elongation process in roots of maize (Zea mays). METHODS Enzymatic hydrolysis followed by biochemical analysis of derivatives was coupled with immunohistochemical detection of cell wall epitopes at different stages of cell development in a series of maize root zones. KEY RESULTS Two xylan-directed antibodies (LM11 and ABX) have distinct patterns of primary cell wall labelling in cross-sections of growing maize roots. The LM11 epitopes were masked by mixed-linkage glucan and were revealed only after lichenase treatment. They could be removed from the section by xylanase treatment. Accessibility of ABX epitopes was not affected by the lichenase treatment. Xylanase treatment released only part of the cell wall glucuronoarabinoxylan and produced two types of products: high-substituted (released in polymeric form) and low-substituted (released as low-molecular-mass fragments). The amount of the latter was highly correlated with the amount of mixed-linkage glucan. CONCLUSIONS Three domains of glucuronoarabinoxylan were determined: one separating cellulose microfibrils, one interacting with them and a middle domain between the two, which links them. The middle domain is masked by the mixed-linkage glucan. A model is proposed in which the mixed-linkage glucan serves as a gel-like filler of the space between the separating domain of the glucuronoarabinoxylan and the cellulose microfibrils. Space for glucan is provided along the middle domain, the proportion of which increases during cell elongation.
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Affiliation(s)
- L V Kozlova
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Science, Kazan, Lobachevskij str., 2/31, 420111, Russia
| | - M V Ageeva
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Science, Kazan, Lobachevskij str., 2/31, 420111, Russia
| | - N N Ibragimova
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Science, Kazan, Lobachevskij str., 2/31, 420111, Russia
| | - T A Gorshkova
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Science, Kazan, Lobachevskij str., 2/31, 420111, Russia
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31
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Buffetto F, Ropartz D, Zhang XJ, Gilbert HJ, Guillon F, Ralet MC. Recovery and fine structure variability of RGII sub-domains in wine (Vitis vinifera Merlot). Ann Bot 2014; 114:1327-37. [PMID: 24908680 PMCID: PMC4195555 DOI: 10.1093/aob/mcu097] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
BACKGROUND AND AIMS Rhamnogalacturonan II (RGII) is a structurally complex pectic sub-domain composed of more than 12 different sugars and 20 different linkages distributed in five side chains along a homogalacturonan backbone. Although RGII has long been described as highly conserved over plant evolution, recent studies have revealed variations in the structure of the polysaccharide. This study examines the fine structure variability of RGII in wine, focusing on the side chains A and B obtained after sequential mild acid hydrolysis. Specifically, this study aims to differentiate intrinsic structural variations in these RGII side chains from structural variations due to acid hydrolysis. METHODS RGII from wine (Vitis vinifera Merlot) was sequentially hydrolysed with trifluoroacetic acid (TFA) and the hydrolysis products were separated by anion-exchange chromatography (AEC). AEC fractions or total hydrolysates were analysed by MALDI-TOF mass spectrometry. KEY RESULTS The optimal conditions to recover non-degraded side chain B, side chain A and RGII backbone were 0·1 m TFA at 40 °C for 16 h, 0·48 m TFA at 40 °C for 16 h (or 0·1 m TFA at 60 °C for 8 h) and 0·1 m TFA at 60 °C for 16 h, respectively. Side chain B was particularly prone to acid degradation. Side chain A and the RGII GalA backbone were partly degraded by 0·1 m TFA at 80 °C for 1-4 h. AEC allowed separation of side chain B, methyl-esterified side chain A and non-methyl-esterified side chain A. The structure of side chain A and the GalA backbone were highly variable. CONCLUSIONS Several modifications to the RGII structure of wine were identified. The observed dearabinosylation and deacetylation were primarily the consequence of acidic treatment, while variation in methyl-esterification, methyl-ether linkages and oxidation reflect natural diversity. The physiological significance of this variability, however, remains to be determined.
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Affiliation(s)
- F Buffetto
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - D Ropartz
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - X J Zhang
- Institute for Cell and Molecular Biosciences Medical School, Newcastle University, Framlington Place, UK
| | - H J Gilbert
- Institute for Cell and Molecular Biosciences Medical School, Newcastle University, Framlington Place, UK
| | - F Guillon
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
| | - M-C Ralet
- INRA, UR1268 Biopolymères Interactions Assemblages, 44300 Nantes, France
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32
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Li M, Feng S, Wu L, Li Y, Fan C, Zhang R, Zou W, Tu Y, Jing HC, Li S, Peng L. Sugar-rich sweet sorghum is distinctively affected by wall polymer features for biomass digestibility and ethanol fermentation in bagasse. Bioresour Technol 2014; 167:14-23. [PMID: 24968107 DOI: 10.1016/j.biortech.2014.04.086] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Revised: 04/23/2014] [Accepted: 04/26/2014] [Indexed: 05/05/2023]
Abstract
Sweet sorghum has been regarded as a typical species for rich soluble-sugar and high lignocellulose residues, but their effects on biomass digestibility remain unclear. In this study, we examined total 63 representative sweet sorghum accessions that displayed a varied sugar level at stalk and diverse cell wall composition at bagasse. Correlative analysis showed that both soluble-sugar and dry-bagasse could not significantly affect lignocellulose saccharification under chemical pretreatments. Comparative analyses of five typical pairs of samples indicated that DP of crystalline cellulose and arabinose substitution degree of non-KOH-extractable hemicelluloses distinctively affected lignocellulose crystallinity for high biomass digestibility. By comparison, lignin could not alter lignocellulose crystallinity, but the KOH-extractable G-monomer predominately determined lignin negative impacts on biomass digestions, and the G-levels released from pretreatments significantly inhibited yeast fermentation. The results also suggested potential genetic approaches for enhancing soluble-sugar level and lignocellulose digestibility and reducing ethanol conversion inhibition in sweet sorghum.
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Affiliation(s)
- Meng Li
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Shengqiu Feng
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Leiming Wu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ying Li
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Chunfen Fan
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Rui Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Weihua Zou
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yuanyuan Tu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hai-Chun Jing
- Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Shizhong Li
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Liangcai Peng
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Biomass and Bioenergy Research Centre, Huazhong Agricultural University, Wuhan 430070, China; College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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33
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Ito J, Herter T, Baidoo EEK, Lao J, Vega-Sánchez ME, Michelle Smith-Moritz A, Adams PD, Keasling JD, Usadel B, Petzold CJ, Heazlewood JL. Analysis of plant nucleotide sugars by hydrophilic interaction liquid chromatography and tandem mass spectrometry. Anal Biochem 2013; 448:14-22. [PMID: 24299991 DOI: 10.1016/j.ab.2013.11.026] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 11/11/2013] [Accepted: 11/22/2013] [Indexed: 12/22/2022]
Abstract
Understanding the intricate metabolic processes involved in plant cell wall biosynthesis is limited by difficulties in performing sensitive quantification of many involved compounds. Hydrophilic interaction liquid chromatography is a useful technique for the analysis of hydrophilic metabolites from complex biological extracts and forms the basis of this method to quantify plant cell wall precursors. A zwitterionic silica-based stationary phase has been used to separate hydrophilic nucleotide sugars involved in cell wall biosynthesis from milligram amounts of leaf tissue. A tandem mass spectrometry operating in selected reaction monitoring mode was used to quantify nucleotide sugars. This method was highly repeatable and quantified 12 nucleotide sugars at low femtomole quantities, with linear responses up to four orders of magnitude to several 100pmol. The method was also successfully applied to the analysis of purified leaf extracts from two model plant species with variations in their cell wall sugar compositions and indicated significant differences in the levels of 6 out of 12 nucleotide sugars. The plant nucleotide sugar extraction procedure was demonstrated to have good recovery rates with minimal matrix effects. The approach results in a significant improvement in sensitivity when applied to plant samples over currently employed techniques.
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Affiliation(s)
- Jun Ito
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Thomas Herter
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm 14476, Germany
| | - Edward E K Baidoo
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jeemeng Lao
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Miguel E Vega-Sánchez
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - A Michelle Smith-Moritz
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Paul D Adams
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Department of Bioengineering, University of California, Berkeley, CA 94720, USA
| | - Jay D Keasling
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Department of Bioengineering, University of California, Berkeley, CA 94720, USA; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
| | - Björn Usadel
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm 14476, Germany; RWTH Aachen University, Institute for Biology I, Aachen 52056, Germany; Forschungszentrum Jülich, IBG-2: Plant Sciences, Jülich 52425, Germany
| | - Christopher J Petzold
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Joshua L Heazlewood
- Joint BioEnergy Institute and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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