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Li K, Barrett K, Agger JW, Zeuner B, Meyer AS. Bioinformatics-based identification of GH12 endoxyloglucanases in citrus-pathogenic Penicillium spp. Enzyme Microb Technol 2024; 178:110441. [PMID: 38574421 DOI: 10.1016/j.enzmictec.2024.110441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/25/2024] [Accepted: 03/26/2024] [Indexed: 04/06/2024]
Abstract
Millions of tons of citrus peel waste are produced every year as a byproduct of the juice industry. Citrus peel is rich in pectin and xyloglucan, but while the pectin is extracted for use in the food industry, the xyloglucan is currently not valorized. To target hydrolytic degradation of citrus peel xyloglucan into oligosaccharides, we have used bioinformatics to identify three glycoside hydrolase 12 (GH12) endoxyloglucanases (EC 3.2.1.151) from the citrus fruit pathogens Penicillium italicum GL-Gan1 and Penicillium digitatum Pd1 and characterized them on xyloglucan obtained by alkaline extraction from citrus peel. The enzymes displayed pH-temperature optima of pH 4.6-5.3 and 35-37°C. PdGH12 from P. digitatum and PiGH12A from P. italicum share 84% sequence identity and displayed similar kinetics, although kcat was highest for PdGH12. In contrast, PiGH12B from P. italicum, which has the otherwise conserved Trp in subsite -4 replaced with a Tyr, displayed a 3 times higher KM and a 4 times lower kcat/KM than PiGH12A, but was the most thermostable enzyme of the three Penicillium-derived endoxyloglucanases. The benchmark enzyme AnGH12 from Aspergillus nidulans was more thermally stable and had a higher pH-temperature optimum than the enzymes from Penicillum spp. The difference in structure of the xyloglucan oligosaccharides extracted from citrus peel xyloglucan and tamarind xyloglucan by the new endoxyloglucanases was determined by LC-MS. The inclusion of citrus peel xyloglucan demonstrated that the endoxyloglucanases liberated fucosylated xyloglucan oligomers, implying that these enzymes have the potential to upgrade citrus peel residues to produce oligomers useful as intermediates or bioactive compounds.
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Affiliation(s)
- Kai Li
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, Kgs. Lyngby 2800, Denmark
| | - Kristian Barrett
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, Kgs. Lyngby 2800, Denmark
| | - Jane W Agger
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, Kgs. Lyngby 2800, Denmark
| | - Birgitte Zeuner
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, Kgs. Lyngby 2800, Denmark.
| | - Anne S Meyer
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads 221, Kgs. Lyngby 2800, Denmark
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2
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Takeda T, Takahashi M, Shimizu M, Sugihara Y, Yamashita T, Saitoh H, Fujisaki K, Ishikawa K, Utsushi H, Kanzaki E, Sakamoto Y, Abe A, Terauchi R. Rice apoplastic CBM1-interacting protein counters blast pathogen invasion by binding conserved carbohydrate binding module 1 motif of fungal proteins. PLoS Pathog 2022; 18:e1010792. [PMID: 36173975 PMCID: PMC9521807 DOI: 10.1371/journal.ppat.1010792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 08/04/2022] [Indexed: 11/20/2022] Open
Abstract
When infecting plants, fungal pathogens secrete cell wall-degrading enzymes (CWDEs) that break down cellulose and hemicellulose, the primary components of plant cell walls. Some fungal CWDEs contain a unique domain, named the carbohydrate binding module (CBM), that facilitates their access to polysaccharides. However, little is known about how plants counteract pathogen degradation of their cell walls. Here, we show that the rice cysteine-rich repeat secretion protein OsRMC binds to and inhibits xylanase MoCel10A of the blast fungus pathogen Magnaporthe oryzae, interfering with its access to the rice cell wall and degradation of rice xylan. We found binding of OsRMC to various CBM1-containing enzymes, suggesting that it has a general role in inhibiting the action of CBM1. OsRMC is localized to the apoplast, and its expression is strongly induced in leaves infected with M. oryzae. Remarkably, knockdown and overexpression of OsRMC reduced and enhanced rice defense against M. oryzae, respectively, demonstrating that inhibition of CBM1-containing fungal enzymes by OsRMC is crucial for rice defense. We also identified additional CBM-interacting proteins (CBMIPs) from Arabidopsis thaliana and Setaria italica, indicating that a wide range of plants counteract pathogens through this mechanism. Plants have evolved various activity-inhibiting proteins as a defense against fungal cell wall-degrading enzymes (CWDEs), but how plants counteract the function of fungal enzymes containing carbohydrate binding modules (CBMs) remains unknown. Here, we demonstrate that OsRMC, a member of the cysteine-rich repeat secretion protein family, interacts with fungal CBM1. OsRMC binding to CBM1 of a blast fungal xylanase blocks access to cellulose, resulting in the inhibition of xylanase enzymatic activity. Our study provides significant insights into plant countermeasures against CWDEs in the apoplastic space during plant-fungal pathogen interactions. It also reveals a molecular function of the DUF26 domain widely distributed in plant proteins.
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Affiliation(s)
- Takumi Takeda
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
- * E-mail: (TT); (RT)
| | | | - Motoki Shimizu
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Yu Sugihara
- Laboratory of Crop Evolution, Graduate School of Agriculture, Kyoto University, Mozume, Muko, Kyoto, Japan
| | | | - Hiromasa Saitoh
- Department of Molecular Microbiology, Tokyo University of Agriculture, Setagaya-ku, Tokyo, Japan
| | - Koki Fujisaki
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | | | - Hiroe Utsushi
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Eiko Kanzaki
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | | | - Akira Abe
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Ryohei Terauchi
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
- Laboratory of Crop Evolution, Graduate School of Agriculture, Kyoto University, Mozume, Muko, Kyoto, Japan
- * E-mail: (TT); (RT)
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3
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Bradley EL, Ökmen B, Doehlemann G, Henrissat B, Bradshaw RE, Mesarich CH. Secreted Glycoside Hydrolase Proteins as Effectors and Invasion Patterns of Plant-Associated Fungi and Oomycetes. FRONTIERS IN PLANT SCIENCE 2022; 13:853106. [PMID: 35360318 PMCID: PMC8960721 DOI: 10.3389/fpls.2022.853106] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/14/2022] [Indexed: 05/06/2023]
Abstract
During host colonization, plant-associated microbes, including fungi and oomycetes, deliver a collection of glycoside hydrolases (GHs) to their cell surfaces and surrounding extracellular environments. The number and type of GHs secreted by each organism is typically associated with their lifestyle or mode of nutrient acquisition. Secreted GHs of plant-associated fungi and oomycetes serve a number of different functions, with many of them acting as virulence factors (effectors) to promote microbial host colonization. Specific functions involve, for example, nutrient acquisition, the detoxification of antimicrobial compounds, the manipulation of plant microbiota, and the suppression or prevention of plant immune responses. In contrast, secreted GHs of plant-associated fungi and oomycetes can also activate the plant immune system, either by acting as microbe-associated molecular patterns (MAMPs), or through the release of damage-associated molecular patterns (DAMPs) as a consequence of their enzymatic activity. In this review, we highlight the critical roles that secreted GHs from plant-associated fungi and oomycetes play in plant-microbe interactions, provide an overview of existing knowledge gaps and summarize future directions.
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Affiliation(s)
- Ellie L. Bradley
- Bioprotection Aotearoa, School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Bilal Ökmen
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
- Department of Microbial Interactions, IMIT/ZMBP, University of Tübingen, Tübingen, Germany
| | - Gunther Doehlemann
- Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany
| | - Bernard Henrissat
- DTU Bioengineering, Technical University of Denmark, Kongens Lyngby, Denmark
- Architecture et Fonction des Macromolécules Biologiques (AFMB), UMR 7257 Centre National de la Recherche Scientifique (CNRS), Université Aix-Marseille, Marseille, France
- Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Rosie E. Bradshaw
- Bioprotection Aotearoa, School of Natural Sciences, Massey University, Palmerston North, New Zealand
| | - Carl H. Mesarich
- Bioprotection Aotearoa, School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
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4
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Rykov SV, Selimzyanova AI, Nikolaeva AY, Lazarenko VA, Tsurin NV, Akentyev PI, Zverlov VV, Liebl W, Schwarz WH, Berezina OV. Unusual substrate specificity in GH family 12: structure-function analysis of glucanases Bgh12A and Xgh12B from Aspergillus cervinus, and Egh12 from Thielavia terrestris. Appl Microbiol Biotechnol 2022; 106:1493-1509. [PMID: 35129654 DOI: 10.1007/s00253-022-11811-7] [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: 08/21/2021] [Revised: 01/17/2022] [Accepted: 01/26/2022] [Indexed: 11/28/2022]
Abstract
In this study, we compared the properties and structures of three fungal GH12 enzymes: the strict endoglucanase Bgh12A and the xyloglucanase Xgh12B from Aspergillus cervinus, and the endoglucanase Egh12 from Thielavia terrestris combining activity on linear β-glucan and branched xyloglucan. Egh12 from T. terrestris was produced in Pichia pastoris, purified, and characterized as a thermostable enzyme with maximal activity at 70 ºC and a half-life time of 138 min at 65 °C. We for the first time demonstrated that the GH12 endoglucanases Egh12 and Bgh12A, but not the strict xyloglucanase Xgh12B, hydrolyzed (1,3)-β-linkages in (1,3;1,4)-β-D-glucooligosaccharides and had transglycosylase activity on (1,3)-β-D-glucooligosaccharides. Phylogenetic analysis indicated that Egh12 from T. terrestris and Bgh12A from A. cervinus are more related than Bgh12A and Xgh12B isolated from one strain. The X-ray structure of Bgh12A was determined with 2.17 Å resolution and compared with 3D-homology models of Egh12 and Xgh12B. The enzymes have a β-jelly roll structure with a catalytic cleft running across the protein. Comparative analysis and a docking study demonstrated the importance of endoglucanase-specific loop 1 partly covering the catalytic cleft for correct placement of the linear substrates. Variability in substrate specificity between the GH12 endoglucanases is determined by non-conservative residues in structural loops framing the catalytic cleft. A residue responsible for the thermostability of Egh12 was predicted. The key structural elements and residues described in this study may serve as potential targets for modification aimed at the improvement of enzymatic properties. KEY POINTS: • Thermostable endoglucanase Egh12 from T. terrestris was produced in P. pastoris, purified, and characterized • The X-ray structure of GH12 endoglucanase Bgh12A from A. cervinus was resolved • GH12 endoglucanases, but not GH12 xyloglucanases, hydrolyze (1,3)-β-linkages in (1,3;1,4)-β-D-glucooligosaccharides.
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Affiliation(s)
- Sergey V Rykov
- National Research Center «Kurchatov Institute» - GOSNIIGENETIKA, Kurchatov Genomic Center, 1-st Dorozhniy pr. 1, 117545, Moscow, Russian Federation.,National Research Center «Kurchatov Institute», Kurchatov Sq. 1, 123182, Moscow, Russian Federation
| | - Alina I Selimzyanova
- National Research Center «Kurchatov Institute» - GOSNIIGENETIKA, Kurchatov Genomic Center, 1-st Dorozhniy pr. 1, 117545, Moscow, Russian Federation
| | - Alena Y Nikolaeva
- National Research Center «Kurchatov Institute» - Institute of Molecular Genetics, Kurchatov Sq. 2, 123182, Moscow, Russian Federation
| | - Vladimir A Lazarenko
- National Research Center «Kurchatov Institute» - Institute of Molecular Genetics, Kurchatov Sq. 2, 123182, Moscow, Russian Federation
| | - Nikita V Tsurin
- National Research Center «Kurchatov Institute» - GOSNIIGENETIKA, Kurchatov Genomic Center, 1-st Dorozhniy pr. 1, 117545, Moscow, Russian Federation
| | - Philipp I Akentyev
- National Research Center «Kurchatov Institute» - GOSNIIGENETIKA, Kurchatov Genomic Center, 1-st Dorozhniy pr. 1, 117545, Moscow, Russian Federation.,National Research Center «Kurchatov Institute», Kurchatov Sq. 1, 123182, Moscow, Russian Federation
| | - Vladimir V Zverlov
- National Research Center «Kurchatov Institute» - Institute of Molecular Genetics, Kurchatov Sq. 2, 123182, Moscow, Russian Federation. .,Chair of Microbiology, Technical University of Munich, Emil-Ramann-Str. 4, 85354, Freising, Germany.
| | - Wolfgang Liebl
- Chair of Microbiology, Technical University of Munich, Emil-Ramann-Str. 4, 85354, Freising, Germany
| | | | - Oksana V Berezina
- National Research Center «Kurchatov Institute» - GOSNIIGENETIKA, Kurchatov Genomic Center, 1-st Dorozhniy pr. 1, 117545, Moscow, Russian Federation. .,National Research Center «Kurchatov Institute», Kurchatov Sq. 1, 123182, Moscow, Russian Federation.
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5
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Poaceae-specific cell wall-derived oligosaccharides activate plant immunity via OsCERK1 during Magnaporthe oryzae infection in rice. Nat Commun 2021. [DOI: 10.1038/s41467-021-22456-x\] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
AbstractMany phytopathogens secrete cell wall degradation enzymes (CWDEs) to damage host cells and facilitate colonization. As the major components of the plant cell wall, cellulose and hemicellulose are the targets of CWDEs. Damaged plant cells often release damage-associated molecular patterns (DAMPs) to trigger plant immune responses. Here, we establish that the fungal pathogen Magnaporthe oryzae secretes the endoglucanases MoCel12A and MoCel12B during infection of rice (Oryza sativa). These endoglucanases target hemicellulose of the rice cell wall and release two specific oligosaccharides, namely the trisaccharide 31-β-D-Cellobiosyl-glucose and the tetrasaccharide 31-β-D-Cellotriosyl-glucose. 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose bind the immune receptor OsCERK1 but not the chitin binding protein OsCEBiP. However, they induce the dimerization of OsCERK1 and OsCEBiP. In addition, these Poaceae cell wall-specific oligosaccharides trigger a burst of reactive oxygen species (ROS) that is largely compromised in oscerk1 and oscebip mutants. We conclude that 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose are specific DAMPs released from the hemicellulose of rice cell wall, which are perceived by an OsCERK1 and OsCEBiP immune complex during M. oryzae infection in rice.
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6
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Ma J, Li Y, Han S, Jiang Z, Yan Q, Yang S. Structural and biochemical insights into the substrate-binding mechanism of a glycoside hydrolase family 12 β-1,3-1,4-glucanase from Chaetomium sp. J Struct Biol 2021; 213:107774. [PMID: 34329700 DOI: 10.1016/j.jsb.2021.107774] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/16/2021] [Accepted: 07/22/2021] [Indexed: 10/20/2022]
Abstract
β-1,3-1,4-Glucanases are a type of hydrolytic enzymes capable of catalyzing the strict cleavage of β-1,4 glycosidic bonds adjacent to β-1,3 linkages in β-D-glucans and have exhibited great potential in food and feed industrials. In this study, a novel glycoside hydrolase (GH) family 12 β-1,3-1,4-glucanase (CtGlu12A) from the thermophilic fungus Chaetomium sp. CQ31 was identified and biochemically characterized. CtGlu12A was most active at pH 7.5 and 65 °C, respectively, and exhibited a high specific activity of 999.9 U mg-1 towards lichenin. It maintained more than 80% of its initial activity in a wide pH range of 5.0-11.0, and up to 60 °C after incubation at 55 °C for 60 min. Moreover, the crystal structures of CtGlu12A with gentiobiose and tetrasccharide were resolved. CtGlu12A had a β-jellyroll fold, and performed retaining mechanism with two glutamic acids severing as the catalytic residues. In the complex structure, cellobiose molecule showed two binding modes, occupying subsites -2 to -1 and subsites + 1 to + 2, respectively. The concave cleft made mixed β-1,3-1,4-glucan substrates maintain a bent conformation to fit into the active site. Overall, this study is not only helpful for the understanding of the substrate-binding model and catalytic mechanism of GH 12 β-1,3-1,4-glucanases, but also provides a basis for further enzymatic engineering of β-1,3-1,4-glucanases.
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Affiliation(s)
- Junwen Ma
- Key Laboratory of Food Bioengineering (China National Light Industry), College of Engineering, China Agricultural University, Beijing 100083, China
| | - Yanxiao Li
- Key Laboratory of Food Bioengineering (China National Light Industry), College of Engineering, China Agricultural University, Beijing 100083, China
| | - Susu Han
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Zhengqiang Jiang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Qiaojuan Yan
- Key Laboratory of Food Bioengineering (China National Light Industry), College of Engineering, China Agricultural University, Beijing 100083, China
| | - Shaoqing Yang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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7
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Yang C, Liu R, Pang J, Ren B, Zhou H, Wang G, Wang E, Liu J. Poaceae-specific cell wall-derived oligosaccharides activate plant immunity via OsCERK1 during Magnaporthe oryzae infection in rice. Nat Commun 2021; 12:2178. [PMID: 33846336 PMCID: PMC8042013 DOI: 10.1038/s41467-021-22456-x] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 03/10/2021] [Indexed: 02/01/2023] Open
Abstract
Many phytopathogens secrete cell wall degradation enzymes (CWDEs) to damage host cells and facilitate colonization. As the major components of the plant cell wall, cellulose and hemicellulose are the targets of CWDEs. Damaged plant cells often release damage-associated molecular patterns (DAMPs) to trigger plant immune responses. Here, we establish that the fungal pathogen Magnaporthe oryzae secretes the endoglucanases MoCel12A and MoCel12B during infection of rice (Oryza sativa). These endoglucanases target hemicellulose of the rice cell wall and release two specific oligosaccharides, namely the trisaccharide 31-β-D-Cellobiosyl-glucose and the tetrasaccharide 31-β-D-Cellotriosyl-glucose. 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose bind the immune receptor OsCERK1 but not the chitin binding protein OsCEBiP. However, they induce the dimerization of OsCERK1 and OsCEBiP. In addition, these Poaceae cell wall-specific oligosaccharides trigger a burst of reactive oxygen species (ROS) that is largely compromised in oscerk1 and oscebip mutants. We conclude that 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose are specific DAMPs released from the hemicellulose of rice cell wall, which are perceived by an OsCERK1 and OsCEBiP immune complex during M. oryzae infection in rice.
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Affiliation(s)
- Chao Yang
- grid.9227.e0000000119573309State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
| | - Rui Liu
- grid.9227.e0000000119573309State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
| | - Jinhuan Pang
- grid.9227.e0000000119573309State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Bin Ren
- grid.410727.70000 0001 0526 1937State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Huanbin Zhou
- grid.410727.70000 0001 0526 1937State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Gang Wang
- grid.9227.e0000000119573309National key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Ertao Wang
- grid.9227.e0000000119573309National key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Jun Liu
- grid.9227.e0000000119573309State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing, China
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8
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Liu X, Jiang Z, Ma S, Yan Q, Chen Z, Liu H. High-level production and characterization of a novel β-1,3-1,4-glucanase from Aspergillus awamori and its potential application in the brewing industry. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.01.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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9
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Gonçalves ACDS, Rezende RP, Marques EDLS, Soares MR, Dias JCT, Romano CC, Costa MS, Dotivo NC, de Moura SR, de Oliveira IS, Pirovani CP. Biotechnological potential of mangrove sediments: Identification and functional attributes of thermostable and salinity-tolerant β-glucanase. Int J Biol Macromol 2020; 147:521-526. [DOI: 10.1016/j.ijbiomac.2020.01.078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 12/14/2019] [Accepted: 01/07/2020] [Indexed: 11/25/2022]
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10
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Zhu Z, Qu J, Yu L, Jiang X, Liu G, Wang L, Qu Y, Qin Y. Three glycoside hydrolase family 12 enzymes display diversity in substrate specificities and synergistic action between each other. Mol Biol Rep 2019; 46:5443-5454. [PMID: 31359382 DOI: 10.1007/s11033-019-04999-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 07/23/2019] [Indexed: 12/01/2022]
Abstract
PoCel12A, PoCel12B, and PoCel12C are genes that encode glycoside hydrolase family 12 (GH12) enzymes in Penicillium oxalicum. PoCel12A and PoCel12B are typical GH12 enzymes that belong to fungal subfamilies 12-1 and 12-2, respectively. PoCel12C contains a low-complexity region (LCR) domain, which is not found in PoCel12A or PoCel12B and independent of fungal subfamily 12-1 or 12-2. Recombinant enzymes (named rCel12A, rCel12B and rCel12C) demonstrate existing diversity in the substrate specificities. Although most members in GH family 12 are typical endoglucanases and preferentially hydrolyze β-1,4-glucan (e.g., carboxymethylcellulose), recombinant PoCel12A is a non-typical endo-(1-4)-β-glucanase; it preferentially hydrolyzes mix-linked β-glucan (barley β-glucan, β-1,3-1,4-glucan) and slightly hydrolyzes β-1,4-glucan (carboxymethylcellulose). Recombinant PoCel12B possesses a significantly high activity against xyloglucan. A specific activity of rCel12B toward xyloglucan (239 µmol/min/mg) is the second-highest value known. Recombinant PoCel12C shows low activity toward β-glucan, carboxymethylcellulose, or xyloglucan. All three enzymes can degrade phosphoric acid-swollen cellulose (PASC). However, the hydrolysis products toward PASC by enzymes are different: the main hydrolysis products are cellotriose, cellotetraose, and cellobiose for rCel12A, rCel12B, and rCel12C, correspondingly. A synergistic action toward PASC among rCel12A and rCel12B is observed, thereby suggesting a potential application for preparing enzyme cocktails used in lignocellulose hydrolysis.
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Affiliation(s)
- Zhu Zhu
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Jingyao Qu
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Lele Yu
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Xukai Jiang
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,Department of Microbiology, Faculty of Medicine, Nursing and Health Sciences, Monash Biomedicine Discovery Institute, Monash University, Melbourne, 3800, Australia
| | - Guodong Liu
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Lushan Wang
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Yinbo Qu
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China
| | - Yuqi Qin
- National Glycoengineering Research Center, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China. .,State Key Lab of Microbial Technology, Shandong University, No. 72 Binhai Road, Qingdao, 266237, China.
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11
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Fujisaki K, Abe Y, Ito A, Saitoh H, Yoshida K, Kanzaki H, Kanzaki E, Utsushi H, Yamashita T, Kamoun S, Terauchi R. Rice Exo70 interacts with a fungal effector, AVR-Pii, and is required for AVR-Pii-triggered immunity. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 83:875-87. [PMID: 26186703 DOI: 10.1111/tpj.12934] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 06/26/2015] [Accepted: 06/26/2015] [Indexed: 05/03/2023]
Abstract
Vesicle trafficking including the exocytosis pathway is intimately associated with host immunity against pathogens. However, we still have insufficient knowledge about how it contributes to immunity, and how pathogen factors affect it. In this study, we explore host factors that interact with the Magnaporthe oryzae effector AVR-Pii. Gel filtration chromatography and co-immunoprecipitation assays identified a 150 kDa complex of proteins in the soluble fraction comprising AVR-Pii and OsExo70-F2 and OsExo70-F3, two rice Exo70 proteins presumably involved in exocytosis. Simultaneous knockdown of OsExo70-F2 and F3 totally abrogated Pii immune receptor-dependent resistance, but had no effect on Pia- and Pik-dependent resistance. Knockdown levels of OsExo70-F3 but not OsExo70-F2 correlated with reduction of Pii function, suggesting that OsExo70-F3 is specifically involved in Pii-dependent resistance. Under our current experimental conditions, over-expression of AVR-Pii or knockdown of OsExo70-F2 and -F3 genes in rice did not affect the virulence of compatible isolates of M. oryzae. AVR-Pii interaction with OsExo70-F3 appears to play a crucial role in immunity triggered by Pii, suggesting a role for OsExo70 as a decoy or helper in Pii/AVR-Pii interactions.
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Affiliation(s)
- Koki Fujisaki
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Yoshiko Abe
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Akiko Ito
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | | | - Kentaro Yoshida
- Organization of Advanced Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | | | - Eiko Kanzaki
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | - Hiroe Utsushi
- Iwate Biotechnology Research Center, Kitakami, Iwate, Japan
| | | | - Sophien Kamoun
- The Sainsbury Laboratory, Norwich Research Park, Norwich, UK
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12
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Takahashi M, Yamamoto R, Sakurai N, Nakano Y, Takeda T. Fungal hemicellulose-degrading enzymes cause physical property changes concomitant with solubilization of cell wall polysaccharides. PLANTA 2015; 241:359-370. [PMID: 25301670 DOI: 10.1007/s00425-014-2176-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 09/13/2014] [Indexed: 06/04/2023]
Abstract
Physical properties of wheat coleoptile segments decreased after treatment with hemicellulose-degrading enzymes, indicating that hemicellulosic polysaccharides function to control the strength of primary cell walls. Changes in the physical properties of plant cell walls, a viscoelastic structure, are thought to be one of the growth-limiting factors for plants and one of the infection-affecting factors for fungi. To study the significance of hemicellulosic polysaccharides that form cross-bridges between cellulose microfibrils in controlling cell wall strength in monocot plants, the effects of hemicellulose degradation by recombinant Magnaporthe oryzae xylanase and 1,3-1,4-β-glucanase, and recombinant Aspergillus oryzae xyloglucanase on the physical properties and polysaccharide solubilization were investigated using wheat (Triticum aestivum L.) coleoptiles. Treatments with xylanase or 1,3-1,4-β-glucanase significantly decreased the viscosity and elasticity of wheat coleoptile segments. In addition, xyloglucanase treatment slightly decreased the viscoelasticity. Furthermore, 1,3-1,4-β-glucan polymer was solubilized during hydrolysis with xylanase and xyloglucanase, even though neither enzyme had hydrolytic activity towards 1,3-1,4-β-glucan. These results suggest that xylan and xyloglucan interact with 1,3-1,4-β-glucan and that the composites and hemicellulosic polysaccharides form inter-molecular bridges. Degradation of these bridges causes decreases in the physical properties, resulting in increased extensibility of the cell walls. These findings provide a testable model in which wheat coleoptile cell walls are loosened by the degradation of hemicellulosic polysaccharides and hemicellulose-degrading enzymes play a significant role in loosening the walls during fungal infection.
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Affiliation(s)
- Machiko Takahashi
- Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate, 024-0003, Japan
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13
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Payne CM, Knott BC, Mayes HB, Hansson H, Himmel ME, Sandgren M, Ståhlberg J, Beckham GT. Fungal Cellulases. Chem Rev 2015; 115:1308-448. [DOI: 10.1021/cr500351c] [Citation(s) in RCA: 533] [Impact Index Per Article: 59.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Christina M. Payne
- Department
of Chemical and Materials Engineering and Center for Computational
Sciences, University of Kentucky, 177 F. Paul Anderson Tower, Lexington, Kentucky 40506, United States
| | - Brandon C. Knott
- National
Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver
West Parkway, Golden, Colorado 80401, United States
| | - Heather B. Mayes
- Department
of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Henrik Hansson
- Department
of Chemistry and Biotechnology, Swedish University of Agricultural Sciences, Uppsala BioCenter, Almas allé 5, SE-75651 Uppsala, Sweden
| | - Michael E. Himmel
- Biosciences
Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
| | - Mats Sandgren
- Department
of Chemistry and Biotechnology, Swedish University of Agricultural Sciences, Uppsala BioCenter, Almas allé 5, SE-75651 Uppsala, Sweden
| | - Jerry Ståhlberg
- Department
of Chemistry and Biotechnology, Swedish University of Agricultural Sciences, Uppsala BioCenter, Almas allé 5, SE-75651 Uppsala, Sweden
| | - Gregg T. Beckham
- National
Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver
West Parkway, Golden, Colorado 80401, United States
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14
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Takeda T, Nakano Y, Takahashi M, Sakamoto Y, Konno N. Polysaccharide-inducible endoglucanases from Lentinula edodes exhibit a preferential hydrolysis of 1,3-1,4-β-glucan and xyloglucan. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:7591-7598. [PMID: 23889585 DOI: 10.1021/jf401543m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Three genes encoding glycoside hydrolase family 12 (GH12) enzymes from Lentinula edodes, namely Lecel12A, Lecel12B, and Lecel12C, were newly cloned by PCR using highly conserved sequence primers. To investigate enzymatic properties, recombinant enzymes encoded by L. edodes DNAs and GH12 genes from Postia placenta (PpCel12A and PpCel12B) and Schizophyllum commune (ScCel12A) were prepared in Brevibacillus choshinensis. Recombinant LeCel12A, PpCel12A, and PpCel12B, which were grouped in GH12 subfamily 1, preferentially hydrolyzed 1,3-1,4-β-glucan. By contrast, LeCel12B, LeCel12C, and ScCel12A, members of the subfamily 2, exhibited specific hydrolysis of xyloglucan. These results suggest that two subfamilies of GH12 are separated based on the substrate specificity. Transcript levels of L. edodes genes increased 72 h after growth of L. edodes mycelia cells in the presence of plant cell wall polymers such as xyloglucan, 1,3-1,4-β-glucan, and cellulose. These results suggest that L. edodes GH12 enzymes have evolved to hydrolyze 1,3-1,4-β-glucan and xyloglucan, which might enhance hyphal extension and nutrient acquisition.
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Affiliation(s)
- Takumi Takeda
- Iwate Biotechnology Research Center , 22-174-4 Narita, Kitakami, Iwate 024-0003, Japan
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15
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Landraud P, Chuzeville S, Billon-Grande G, Poussereau N, Bruel C. Adaptation to pH and role of PacC in the rice blast fungus Magnaporthe oryzae. PLoS One 2013; 8:e69236. [PMID: 23874922 PMCID: PMC3712939 DOI: 10.1371/journal.pone.0069236] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 06/06/2013] [Indexed: 11/30/2022] Open
Abstract
Fungi are known to adapt to pH partly via specific activation of the Pal signaling pathway and subsequent gene regulation through the transcription factor PacC. The role of PacC in pathogenic fungi has been explored in few species, and each time its partaking in virulence has been found. We studied the impact of pH and the role of PacC in the biology of the rice pathogen Magnaporthe oryzae. Conidia formation and germination were affected by pH whereas fungal growth and appressorium formation were not. Growth in vitro and in planta was characterized by alkalinization and ammonia accumulation in the surrounding medium. Expression of the MoPACC gene increased when the fungus was placed under alkaline conditions. Except for MoPALF, expression of the MoPAL genes encoding the pH-signaling components was not influenced by pH. Deletion of PACC caused a progressive loss in growth rate from pH 5 to pH 8, a loss in conidia production at pH 8 in vitro, a loss in regulation of the MoPALF gene, a decreased production of secreted lytic enzymes and a partial loss in virulence towards barley and rice. PacC therefore plays a significant role in M. oryzae’s biology, and pH is revealed as one component at work during interaction between the fungus and its host plants.
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Affiliation(s)
- Patricia Landraud
- UMR 5240 - Microbiologie, Adaptation et Pathogénie; Université Lyon 1, CNRS, Bayer CropScience, Villeurbanne, France
| | - Sarah Chuzeville
- UMR 5240 - Microbiologie, Adaptation et Pathogénie; Université Lyon 1, CNRS, Bayer CropScience, Villeurbanne, France
| | - Geneviève Billon-Grande
- UMR 5240 - Microbiologie, Adaptation et Pathogénie; Université Lyon 1, CNRS, Bayer CropScience, Villeurbanne, France
| | - Nathalie Poussereau
- UMR 5240 - Microbiologie, Adaptation et Pathogénie; Université Lyon 1, CNRS, Bayer CropScience, Villeurbanne, France
| | - Christophe Bruel
- UMR 5240 - Microbiologie, Adaptation et Pathogénie; Université Lyon 1, CNRS, Bayer CropScience, Villeurbanne, France
- * E-mail:
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Recombinant β-1,3-1,4-glucanase from Theobroma cacao impairs Moniliophthora perniciosa mycelial growth. Mol Biol Rep 2013; 40:5417-27. [DOI: 10.1007/s11033-013-2640-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 05/02/2013] [Indexed: 11/25/2022]
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17
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Takahashi M, Yoshioka K, Imai T, Miyoshi Y, Nakano Y, Yoshida K, Yamashita T, Furuta Y, Watanabe T, Sugiyama J, Takeda T. Degradation and synthesis of β-glucans by a Magnaporthe oryzae endotransglucosylase, a member of the glycoside hydrolase 7 family. J Biol Chem 2013; 288:13821-30. [PMID: 23530038 DOI: 10.1074/jbc.m112.448902] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Plant pathogens secrete enzymes that degrade plant cell walls to enhance infection and nutrient acquisition. RESULTS A novel endotransglucosylase catalyzes cleavage and transfer of β-glucans and decreases the physical strength of plant cell walls. CONCLUSION Endotransglucosylation causes depolymerization and polymerization of β-glucans, depending on substrate molecular size. SIGNIFICANCE Enzymatic degradation of plant cell walls is required for wall loosening, which enhances pathogen invasion. A Magnaporthe oryzae enzyme, which was encoded by the Mocel7B gene, was predicted to act on 1,3-1,4-β-glucan degradation and transglycosylation reaction of cellotriose after partial purification from a culture filtrate of M. oryzae cells, followed by liquid chromatography-tandem mass spectrometry. A recombinant MoCel7B prepared by overexpression in M. oryzae exhibited endo-typical depolymerization of polysaccharides containing β-1,4-linkages, in which 1,3-1,4-β-glucan was the best substrate. When cellooligosaccharides were used as the substrate, the recombinant enzyme generated reaction products with both shorter and longer chain lengths than the substrate. In addition, incorporation of glucose and various oligosaccharides including sulforhodamine-conjugated cellobiose, laminarioligosaccharides, gentiobiose, xylobiose, mannobiose, and xyloglucan nonasaccharide into β-1,4-linked glucans were observed after incubation with the enzyme. These results indicate that the recombinant enzyme acts as an endotransglucosylase (ETG) that cleaves the glycosidic bond of β-1,4-glucan as a donor substrate and transfers the cleaved glucan chain to another molecule functioning as an acceptor substrate. Furthermore, ETG treatment caused greater extension of heat-treated wheat coleoptiles. The result suggests that ETG functions to induce wall loosening by cleaving the 1,3-1,4-β-glucan tethers of plant cell walls. On the other hand, use of cellohexaose as a substrate for ETG resulted in the production of cellulose II with a maximum length (degree of polymerization) of 26 glucose units. Thus, ETG functions to depolymerize and polymerize β-glucans, depending on the size of the acceptor substrate.
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Affiliation(s)
- Machiko Takahashi
- Iwate Biotechnology Research Center, 22-174-4, Narita Kitakami, Iwate 024-0003, Japan
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18
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Purification and characterization of cellulase from North Pacific krill (Euphausia pacifica). Analysis of cleavage specificity of the enzyme. Comp Biochem Physiol B Biochem Mol Biol 2012; 163:324-33. [DOI: 10.1016/j.cbpb.2012.08.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 08/29/2012] [Accepted: 08/29/2012] [Indexed: 11/22/2022]
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19
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Characterization of a broad-specificity β-glucanase acting on β-(1,3)-, β-(1,4)-, and β-(1,6)-glucans that defines a new glycoside hydrolase family. Appl Environ Microbiol 2012; 78:8540-6. [PMID: 23023747 DOI: 10.1128/aem.02572-12] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Here we report the cloning of the Pa_3_10940 gene from the coprophilic fungus Podospora anserina, which encodes a C-terminal family 1 carbohydrate binding module (CBM1) linked to a domain of unknown function. The function of the gene was investigated by expression of the full-length protein and a truncated derivative without the CBM1 domain in the yeast Pichia pastoris. Using a library of polysaccharides of different origins, we demonstrated that the full-length enzyme displays activity toward a broad range of β-glucan polysaccharides, including laminarin, curdlan, pachyman, lichenan, pustulan, and cellulosic derivatives. Analysis of the products released from polysaccharides revealed that this β-glucanase is an exo-acting enzyme on β-(1,3)- and β-(1,6)-linked glucan substrates and an endo-acting enzyme on β-(1,4)-linked glucan substrates. Hydrolysis of short β-(1,3), β-(1,4), and β-(1,3)/β-(1,4) gluco-oligosaccharides confirmed this striking feature and revealed that the enzyme performs in an exo-type mode on the nonreducing end of gluco-oligosaccharides. Excision of the CBM1 domain resulted in an inactive enzyme on all substrates tested. To our knowledge, this is the first report of an enzyme that displays bifunctional exo-β-(1,3)/(1,6) and endo-β-(1,4) activities toward beta-glucans and therefore cannot readily be assigned to existing Enzyme Commission groups. The amino acid sequence has high sequence identity to hypothetical proteins within the fungal taxa and thus defines a new family of glycoside hydrolases, the GH131 family.
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A novel glycosylphosphatidylinositol-anchored glycoside hydrolase from Ustilago esculenta functions in β-1,3-glucan degradation. Appl Environ Microbiol 2012; 78:5682-9. [PMID: 22685137 DOI: 10.1128/aem.00483-12] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A glycoside hydrolase responsible for laminarin degradation was partially purified to homogeneity from a Ustilago esculenta culture filtrate by weak-cation-exchange, strong-cation-exchange, and size-exclusion chromatography. Three proteins in enzymatically active fractions were digested with chymotrypsin followed by liquid chromatography-tandem mass spectrometry (LC/MS/MS) analysis, resulting in the identification of three peptide sequences that shared significant similarity to a putative β-1,3-glucanase, a member of glucoside hydrolase family 16 (GH16) from Sporisorium reilianum SRZ2. A gene encoding a laminarin-degrading enzyme from U. esculenta, lam16A, was isolated by PCR using degenerate primers designed based on the S. reilianum SRZ2 β-1,3-glucanase gene. Lam16A possesses a GH16 catalytic domain with an N-terminal signal peptide and a C-terminal glycosylphosphatidylinositol (GPI) anchor peptide. Recombinant Lam16A fused to an N-terminal FLAG peptide (Lam16A-FLAG) overexpressed in Aspergillus oryzae exhibited hydrolytic activity toward β-1,3-glucan specifically and was localized both in the extracellular and in the membrane fractions but not in the cell wall fraction. Lam16A without a GPI anchor signal peptide was secreted extracellularly and was not detected in the membrane fraction. Membrane-anchored Lam16A-FLAG was released completely by treatment with phosphatidylinositol-specific phospholipase C. These results suggest that Lam16A is anchored in the plasma membrane in order to modify β-1,3-glucan associated with the inner cell wall and that Lam16A is also used for the catabolism of β-1,3-glucan after its release in the extracellular medium.
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21
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Tabuchi A, Li LC, Cosgrove DJ. Matrix solubilization and cell wall weakening by β-expansin (group-1 allergen) from maize pollen. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2011; 68:546-59. [PMID: 21749508 DOI: 10.1111/j.1365-313x.2011.04705.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Beta-expansins accumulate to high levels in grass pollen, a feature apparently unique to grasses. These proteins, which are major human allergens, facilitate pollen tube penetration of the maize stigma and style (the silk). Here we report that treatment of maize silk cell walls with purified β-expansin from maize pollen led to solubilization of wall matrix polysaccharides, dominated by feruloyated highly substituted glucuronoarabinoxylan (60%) and homogalacturonan (35%). Such action was selective for cell walls of grasses, and indicated a target preferentially found in grass cell walls, probably the highly substituted glucuronoarabinoxylan. Several tests for lytic activities by β-expansin were negative and polysaccharide solubilization had weak temperature dependence, which indicated a non-enzymatic process. Concomitant with matrix solubilization, β-expansin treatment induced creep, reduced the breaking force and increased the plastic compliance of wall specimens. From comparisons of the pH dependencies of these processes, we conclude that matrix solubilization was linked closely to changes in wall plasticity and breaking force, but not so closely coupled to cell wall creep. Because matrix solubilization and increased wall plasticity have not been found with other expansins, we infer that these novel activities are linked to the specialized role of grass pollen β-expansins in promotion of penetration of the pollen tube through the stigma and style, most likely by weakening the middle lamella.
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Affiliation(s)
- Akira Tabuchi
- Department of Biology, 208 Mueller Laboratory, Pennsylvania State University, University Park, PA 16802, USA
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22
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Nakajima M, Yamashita T, Takahashi M, Nakano Y, Takeda T. Identification, cloning, and characterization of β-glucosidase from Ustilago esculenta. Appl Microbiol Biotechnol 2011; 93:1989-98. [PMID: 21850431 DOI: 10.1007/s00253-011-3538-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 07/23/2011] [Accepted: 08/05/2011] [Indexed: 11/25/2022]
Abstract
Hydrolytic enzymes responsible for laminarin degradation were found to be secreted during growth of Ustilago esculenta on laminarin. An enzyme involved in laminarin degradation was purified by assaying release of glucose from laminaribiose. Ion-exchange chromatography of the culture filtrate followed by size-exclusion chromatography yielded a 110-kDa protein associated with laminaribiose hydrolysis. LC/MS/MS analysis of the 110-kDa protein identified three peptide sequences that shared significant similarity with a putative glucoside hydrolase family (GH) 3 β-glucosidase in Ustilago maydis. Based on the DNA sequence of the U. maydis GH3 β-glucosidase, a gene encoding a putative GH3 β-glucosidase in U. esculenta (Uebgl3A) was cloned by PCR. Based on the deduced amino acid sequence, the protein encoded by Uebgl3A has a molecular mass of 91 kDa and shares 90% identity with U. maydis GH3 β-glucosidase. Recombinant UeBgl3A expressed in Aspergillus oryzae released glucose from β-1,3-, β-1,4-, and β-1,6-linked oligosaccharides, and from 1,3-1,4-β-glucan and laminarin polysaccharides, indicating that UeBgl3A is a β-glucosidase. Kinetic analysis showed that UeBgl3A preferentially hydrolyzed laminaritriose and laminaritetraose. These results suggest that UeBgl3A is a key enzyme that produces glucose from laminarioligosaccharides during growth of U. esculenta on laminarin.
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Affiliation(s)
- Masahiro Nakajima
- Iwate Biotechnology Research Center, 22-174-4, Kitakami, Iwate, 024-0003, Japan
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23
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Takahashi M, Konishi T, Takeda T. Biochemical characterization of Magnaporthe oryzae β-glucosidases for efficient β-glucan hydrolysis. Appl Microbiol Biotechnol 2011; 91:1073-82. [DOI: 10.1007/s00253-011-3340-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Revised: 04/15/2011] [Accepted: 04/16/2011] [Indexed: 10/18/2022]
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