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Ruprecht C, Blaukopf M, Pfrengle F. Synthetic fragments of plant polysaccharides as tools for cell wall biology. Curr Opin Chem Biol 2022; 71:102208. [PMID: 36108403 DOI: 10.1016/j.cbpa.2022.102208] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/08/2022] [Accepted: 08/09/2022] [Indexed: 01/27/2023]
Abstract
A sustainable bioeconomy that includes increased agricultural productivity and new technologies to convert renewable biomass to value-added products may help meet the demands of a growing world population for food, energy and materials. The potential use of plant biomass is determined by the properties of the cell walls, consisting of polysaccharides, proteins, and the polyphenolic polymer lignin. Comprehensive knowledge of cell wall glycan structure and biosynthesis is therefore essential for optimal utilization. However, several areas of plant cell wall research are hampered by a lack of available pure oligosaccharide samples that represent structural features of cell wall glycans. Here, we provide an update on recent chemical syntheses of plant cell wall oligosaccharides and their application in characterizing plant cell wall-directed antibodies and carbohydrate-active enzymes including glycosyltransferases and glycosyl hydrolases, with a particular focus on glycan array technology.
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Affiliation(s)
- Colin Ruprecht
- Department of Chemistry, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190 Vienna, Austria
| | - Markus Blaukopf
- Department of Chemistry, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190 Vienna, Austria
| | - Fabian Pfrengle
- Department of Chemistry, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190 Vienna, Austria.
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2
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Hoshing R, Leeber BW, Kuhn H, Caianiello D, Dale B, Saladino M, Lusi R, Palaychuk N, Weingarten S, Basu A. The Chirality of Aggregated Yariv Reagents Correlates with Their AGP-Binding Ability*. Chembiochem 2021; 23:e202100532. [PMID: 34618387 DOI: 10.1002/cbic.202100532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Indexed: 11/10/2022]
Abstract
Yariv reagents are glycosylated triphenylazo dyes that bind to arabinogalactan proteins (AGPs), proteoglycans found in plant cell walls that are integral for plant growth and development. Yariv reagents are widely utilized as imaging, purification, and quantification tools for AGPs and represent the only small molecule probe for interrogating AGP function. The ability of Yariv reagents to bind to AGPs is dependent on the structure of the terminal glycoside on the dye. The reason for this selectivity has not been understood until the present work. Using circular dichroism spectroscopy, we show that the Yariv reagents form supramolecular aggregates with helical chirality. More significantly, the ability of the Yariv reagent to bind AGPs is correlated with this helical chirality. This finding paves the way towards developing a more detailed understanding of the nature of the Yariv-AGP complex, and the design of AGP-binding reagents with higher affinities and selectivities.
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Affiliation(s)
- Raghuraj Hoshing
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Blaise W Leeber
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Helene Kuhn
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - David Caianiello
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Brandon Dale
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Michael Saladino
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Robert Lusi
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Natalie Palaychuk
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Sarah Weingarten
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
| | - Amit Basu
- Department of Chemistry, Box H, Brown University, Providence, RI 02912, USA
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Fittolani G, Tyrikos-Ergas T, Vargová D, Chaube MA, Delbianco M. Progress and challenges in the synthesis of sequence controlled polysaccharides. Beilstein J Org Chem 2021; 17:1981-2025. [PMID: 34386106 PMCID: PMC8353590 DOI: 10.3762/bjoc.17.129] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/22/2021] [Indexed: 01/15/2023] Open
Abstract
The sequence, length and substitution of a polysaccharide influence its physical and biological properties. Thus, sequence controlled polysaccharides are important targets to establish structure-properties correlations. Polymerization techniques and enzymatic methods have been optimized to obtain samples with well-defined substitution patterns and narrow molecular weight distribution. Chemical synthesis has granted access to polysaccharides with full control over the length. Here, we review the progress towards the synthesis of well-defined polysaccharides. For each class of polysaccharides, we discuss the available synthetic approaches and their current limitations.
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Affiliation(s)
- Giulio Fittolani
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Theodore Tyrikos-Ergas
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Denisa Vargová
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Manishkumar A Chaube
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Martina Delbianco
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
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4
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A Pipeline towards the Biochemical Characterization of the Arabidopsis GT14 Family. Int J Mol Sci 2021; 22:ijms22031360. [PMID: 33572987 PMCID: PMC7866395 DOI: 10.3390/ijms22031360] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 02/07/2023] Open
Abstract
Glycosyltransferases (GTs) catalyze the synthesis of glycosidic linkages and are essential in the biosynthesis of glycans, glycoconjugates (glycolipids and glycoproteins), and glycosides. Plant genomes generally encode many more GTs than animal genomes due to the synthesis of a cell wall and a wide variety of glycosylated secondary metabolites. The Arabidopsis thaliana genome is predicted to encode over 573 GTs that are currently classified into 42 diverse families. The biochemical functions of most of these GTs are still unknown. In this study, we updated the JBEI Arabidopsis GT clone collection by cloning an additional 105 GT cDNAs, 508 in total (89%), into Gateway-compatible vectors for downstream characterization. We further established a functional analysis pipeline using transient expression in tobacco (Nicotiana benthamiana) followed by enzymatic assays, fractionation of enzymatic products by reversed-phase HPLC (RP-HPLC) and characterization by mass spectrometry (MS). Using the GT14 family as an exemplar, we outline a strategy for identifying effective substrates of GT enzymes. By addition of UDP-GlcA as donor and the synthetic acceptors galactose-nitrobenzodiazole (Gal-NBD), β-1,6-galactotetraose (β-1,6-Gal4) and β-1,3-galactopentose (β-1,3-Gal5) to microsomes expressing individual GT14 enzymes, we verified the β-glucuronosyltransferase (GlcAT) activity of three members of this family (AtGlcAT14A, B, and E). In addition, a new family member (AT4G27480, 248) was shown to possess significantly higher activity than other GT14 enzymes. Our data indicate a likely role in arabinogalactan-protein (AGP) biosynthesis for these GT14 members. Together, the updated Arabidopsis GT clone collection and the biochemical analysis pipeline present an efficient means to identify and characterize novel GT catalytic activities.
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Ruprecht C, Bartetzko MP, Senf D, Lakhina A, Smith PJ, Soto MJ, Oh H, Yang J, Chapla D, Varon Silva D, Clausen MH, Hahn MG, Moremen KW, Urbanowicz BR, Pfrengle F. A Glycan Array‐Based Assay for the Identification and Characterization of Plant Glycosyltransferases. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Colin Ruprecht
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Present address: Department of Chemistry University of Natural Resources and Life Sciences Vienna Muthgasse 18 1190 Vienna Austria
| | - Max P. Bartetzko
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Institute of Chemistry and Biochemistry Freie Universität Berlin Arnimallee 22 14195 Berlin Germany
| | - Deborah Senf
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Institute of Chemistry and Biochemistry Freie Universität Berlin Arnimallee 22 14195 Berlin Germany
| | - Anna Lakhina
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Peter J. Smith
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Maria J. Soto
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
- Present address: US Department of Energy Joint Genome Institute (JGI) Berkeley CA 94702 USA
| | - Hyunil Oh
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Institute of Chemistry and Biochemistry Freie Universität Berlin Arnimallee 22 14195 Berlin Germany
| | - Jeong‐Yeh Yang
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Digantkumar Chapla
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Daniel Varon Silva
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Mads H. Clausen
- Center for Nanomedicine and Theranostics Department of Chemistry Technical University of Denmark Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | - Michael G. Hahn
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Kelley W. Moremen
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Breeanna R. Urbanowicz
- Complex Carbohydrate Research Center University of Georgia 315 Riverbend Road Athens GA 30602 USA
| | - Fabian Pfrengle
- Department of Biomolecular Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Institute of Chemistry and Biochemistry Freie Universität Berlin Arnimallee 22 14195 Berlin Germany
- Present address: Department of Chemistry University of Natural Resources and Life Sciences Vienna Muthgasse 18 1190 Vienna Austria
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Ruprecht C, Bartetzko MP, Senf D, Lakhina A, Smith PJ, Soto MJ, Oh H, Yang J, Chapla D, Varon Silva D, Clausen MH, Hahn MG, Moremen KW, Urbanowicz BR, Pfrengle F. A Glycan Array-Based Assay for the Identification and Characterization of Plant Glycosyltransferases. Angew Chem Int Ed Engl 2020; 59:12493-12498. [PMID: 32396713 PMCID: PMC7383710 DOI: 10.1002/anie.202003105] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 04/22/2020] [Indexed: 12/19/2022]
Abstract
Growing plants with modified cell wall compositions is a promising strategy to improve resistance to pathogens, increase biomass digestibility, and tune other important properties. In order to alter biomass architecture, a detailed knowledge of cell wall structure and biosynthesis is a prerequisite. We report here a glycan array-based assay for the high-throughput identification and characterization of plant cell wall biosynthetic glycosyltransferases (GTs). We demonstrate that different heterologously expressed galactosyl-, fucosyl-, and xylosyltransferases can transfer azido-functionalized sugar nucleotide donors to selected synthetic plant cell wall oligosaccharides on the array and that the transferred monosaccharides can be visualized "on chip" by a 1,3-dipolar cycloaddition reaction with an alkynyl-modified dye. The opportunity to simultaneously screen thousands of combinations of putative GTs, nucleotide sugar donors, and oligosaccharide acceptors will dramatically accelerate plant cell wall biosynthesis research.
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Affiliation(s)
- Colin Ruprecht
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
- Present address: Department of ChemistryUniversity of Natural Resources and Life Sciences ViennaMuthgasse 181190ViennaAustria
| | - Max P. Bartetzko
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2214195BerlinGermany
| | - Deborah Senf
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2214195BerlinGermany
| | - Anna Lakhina
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Peter J. Smith
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Maria J. Soto
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
- Present address: US Department of Energy Joint Genome Institute (JGI)BerkeleyCA94702USA
| | - Hyunil Oh
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2214195BerlinGermany
| | - Jeong‐Yeh Yang
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Digantkumar Chapla
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Daniel Varon Silva
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
| | - Mads H. Clausen
- Center for Nanomedicine and TheranosticsDepartment of ChemistryTechnical University of DenmarkKemitorvet 2072800 Kgs.LyngbyDenmark
| | - Michael G. Hahn
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Kelley W. Moremen
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Breeanna R. Urbanowicz
- Complex Carbohydrate Research CenterUniversity of Georgia315 Riverbend RoadAthensGA30602USA
| | - Fabian Pfrengle
- Department of Biomolecular SystemsMax Planck Institute of Colloids and InterfacesAm Mühlenberg 114476PotsdamGermany
- Institute of Chemistry and BiochemistryFreie Universität BerlinArnimallee 2214195BerlinGermany
- Present address: Department of ChemistryUniversity of Natural Resources and Life Sciences ViennaMuthgasse 181190ViennaAustria
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7
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Underlin EN, Böhm M, Madsen R. Synthesis of Arabinoxylan Oligosaccharides by Preactivation-Based Iterative Glycosylations. J Org Chem 2019; 84:16036-16054. [PMID: 31762276 DOI: 10.1021/acs.joc.9b02529] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A concise synthetic strategy has been developed for assembling densely substituted arabinoxylan oligosaccharides, which are valuable substrates for characterizing hemicellulose-degrading enzymes. The xylan backbone has been prepared by an iterative preactivation-based glycosylation approach with phenyl thioglycosides. The preactivation has been performed with in situ generated p-nitrobenzenesulfenyl triflate prior to addition of the acceptor. The glycosylation temperature was shown to have an important impact on the yield of the coupling. The arabinose substituents have been introduced in one high-yielding glycosylation with an N-phenyl trifluoroacetimidate donor. The strategy has been successfully employed for the synthesis of three heptasaccharides in seven steps and overall yields of 24-36% from the corresponding monosaccharide building blocks.
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Affiliation(s)
- Emilie N Underlin
- Department of Chemistry , Technical University of Denmark , 2800 Kgs. Lyngby , Denmark
| | - Maximilian Böhm
- Department of Chemistry , Technical University of Denmark , 2800 Kgs. Lyngby , Denmark
| | - Robert Madsen
- Department of Chemistry , Technical University of Denmark , 2800 Kgs. Lyngby , Denmark
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8
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Nguyen-Phan TC, Fry SC. Functional and chemical characterization of XAF: a heat-stable plant polymer that activates xyloglucan endotransglucosylase/hydrolase (XTH). ANNALS OF BOTANY 2019; 124:131-148. [PMID: 31147677 PMCID: PMC6676392 DOI: 10.1093/aob/mcz050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Accepted: 04/25/2019] [Indexed: 05/16/2023]
Abstract
BACKGROUND AND AIMS Xyloglucan endotransglucosylase/hydrolase (XTH) proteins that possess xyloglucan endotransglucosylase (XET) activity contribute to cell-wall assembly and remodelling, orchestrating plant growth and development. Little is known about in-vivo XET regulation, other than at the XTH transcriptional level. Plants contain 'cold-water-extractable, heat-stable polymers' (CHPs) which are XTH-activating factors (XAFs) that desorb and thereby activate wall-bound XTHs. Because XAFs may control cell-wall modification in vivo, we have further explored their nature. METHODS Material was cold-water-extracted from 25 plant species; proteins were precipitated by heat-denaturation, then CHP was ethanol-precipitated. For XAF assays, CHP (or sub-fractions thereof) was applied to washed Arabidopsis thaliana cell walls, and the enzymes thus solubilized were assayed radiochemically for XET activity. In some experiments, the CHP was pre-treated with trifluoroacetic acid (TFA), alkali (NaOH) or glycanases. KEY RESULTS CHP specifically desorbed wall-bound XTHs, but not β-glucosidases, phosphatases or peroxidases. CHP preparations from 25 angiosperms all possessed XAF activity but had no consistent monosaccharide composition. Of 11 individual plant polymers tested, only gum arabic and tamarind xyloglucan were XAF-active, albeit less so than CHP. On gel-permeation chromatography, XAF-active cauliflower CHP eluted with a molecular weight of ~7000-140 000, although no specific sugar residue(s) co-eluted exactly with XAF activity. Cauliflower XAF activity survived cold alkali and warm dilute TFA (which break ester and glycofuranosyl linkages, respectively), but was inactivated by hot 2 m TFA (which breaks glycopyranosyl linkages). Cauliflower XAF activity was remarkably stable to diverse glycanases and glycosidases. CONCLUSIONS XAFs are naturally occurring heat-stable polymers that specifically desorb (thereby activating) wall-bound XTHs. Their XAF activity considerably exceeds that of gum arabic and tamarind xyloglucan, and they were not identifiable as any major plant polysaccharide. We propose that XAF is a specific, minor, plant polymer that regulates xyloglucan transglycosylation in vivo, and thus wall assembly and restructuring.
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Affiliation(s)
- Tu C Nguyen-Phan
- The Edinburgh Cell Wall Group, Institute of Molecular Plant Sciences, The University of Edinburgh, Max Born Crescent, Edinburgh, UK
| | - Stephen C Fry
- The Edinburgh Cell Wall Group, Institute of Molecular Plant Sciences, The University of Edinburgh, Max Born Crescent, Edinburgh, UK
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Kalomoiri P, Holck J, Coulomb L, Boos I, Enemark-Rasmussen K, Spodsberg N, Monrad RN, Clausen MH. Substrate specificity of novel GH16 endo-β-(1→3)-galactanases acting on linear and branched β-(1→3)-galactooligosaccharides. J Biotechnol 2018; 290:44-52. [PMID: 30576682 DOI: 10.1016/j.jbiotec.2018.12.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 11/20/2018] [Accepted: 12/04/2018] [Indexed: 10/27/2022]
Abstract
Arabinogalactan proteins are proteoglycans located in the plant cell wall. Most arabinogalactan proteins are composed of carbohydrate moieties of β-(1→3)-galactan main chains with β-(1→6)-galactan side chains terminated by other glycans. In this study, three novel endo-β-(1→3)-galactanases were identified and the substrate specificity was further studied using well-defined galactan oligomers. Linear and branched β-(1→3)-linked galactans, which resemble the carbohydrate core of the arabinogalactan protein, were used for the characterization of endo-β-(1→3)-galactanases. The identified enzymes required at least three consecutive galactose residues for activity. Non-substituted regions were preferred, but substituents in the -2 and +2 and in some cases also -1 and +1 subsites were tolerated to some extent, depending on the branching pattern, however at a significantly lower rate/frequency.
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Affiliation(s)
- Panagiota Kalomoiri
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
| | - Jesper Holck
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark; Center for Bioprocess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Laure Coulomb
- Novozymes A/S, Krogshøjvej 36, DK-2880 Bagsværd, Denmark
| | - Irene Boos
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
| | - Kasper Enemark-Rasmussen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark
| | | | | | - Mads H Clausen
- Center for Nanomedicine and Theranostics, Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark.
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Marion KC, Wooke Z, Pohl NLB. Synthesis of protected glucose derivatives from levoglucosan by development of common carbohydrate protecting group reactions under continuous flow conditions. Carbohydr Res 2018; 468:23-29. [PMID: 30121415 PMCID: PMC6615043 DOI: 10.1016/j.carres.2018.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 12/22/2022]
Abstract
Common carbohydrate protecting group reactions under continuous flow processes are reported in the context of producing partially-protected glucose building blocks from levoglucosan. Benzyl ether protection was demonstrated without the use of NaH using barium oxide, which, however, pointed to the need for forms of this catalyst not as susceptible to close packing under flow. Acylation conditions were developed under continuous flow in acetonitrile and avoiding pyridine. Ring-opening the derivatized levoglucosan with propanethiol was also demonstrated producing S-alkyl 2,4-di-O-benzyl-glucopyranoside building block in 2 rather than 12 steps in increased overall yield.
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Affiliation(s)
- Keevan C Marion
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States
| | - Zachary Wooke
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States
| | - Nicola L B Pohl
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States.
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