1
|
Gao W, Li T, Zhou H, Ju J, Yin H. Carbohydrate-binding modules enhance H 2O 2 tolerance by promoting lytic polysaccharide monooxygenase active site H 2O 2 consumption. J Biol Chem 2024; 300:105573. [PMID: 38122901 PMCID: PMC10825053 DOI: 10.1016/j.jbc.2023.105573] [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: 09/12/2023] [Revised: 11/26/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023] Open
Abstract
Lytic polysaccharide monooxygenases (LPMOs) oxidatively depolymerize recalcitrant polysaccharides, which is important for biomass conversion. The catalytic domains of many LPMOs are linked to carbohydrate-binding modules (CBMs) through flexible linkers, but the function of these CBMs in LPMO catalysis is not well understood. In this study, we utilized MtLPMO9L and MtLPMO9G derived from Myceliophthora thermophila to investigate the impact of CBMs on LPMO activity, with particular emphasis on their influence on H2O2 tolerance. Using truncated forms of MtLPMO9G generated by removing the CBM, we found reduced substrate binding affinity and enzymatic activity. Conversely, when the CBM was fused to the C terminus of the single-domain MtLPMO9L to create MtLPMO9L-CBM, we observed a substantial improvement in substrate binding affinity, enzymatic activity, and notably, H2O2 tolerance. Furthermore, molecular dynamics simulations confirmed that the CBM fusion enhances the proximity of the active site to the substrate, thereby promoting multilocal cleavage and impacting the exposure of the copper active site to H2O2. Importantly, the fusion of CBM resulted in more efficient consumption of H2O2 by LPMO, leading to improved enzymatic activity and reduced auto-oxidative damage of the copper active center.
Collapse
Affiliation(s)
- Wa Gao
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China
| | - Tang Li
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Haichuan Zhou
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Jiu Ju
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Heng Yin
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Dalian Technology Innovation Center for Green Agriculture, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China; University of Chinese Academy of Sciences, Beijing, China.
| |
Collapse
|
2
|
Liu J, Zhu J, Xu Q, Shi R, Liu C, Sun D, Liu W. Functional identification of two novel carbohydrate-binding modules of glucuronoxylanase CrXyl30 and their contribution to the lignocellulose saccharification. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2023; 16:40. [PMID: 36890582 PMCID: PMC9996879 DOI: 10.1186/s13068-023-02290-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 02/28/2023] [Indexed: 03/10/2023]
Abstract
BACKGROUND Glycoside hydrolase (GH) family 30 xylanases are a distinct group of xylanases, most of which have a highly specific catalytic activity for glucuronoxylan. Since GH30 xylanases do not normally carry carbohydrate-binding modules (CBMs), our knowledge of the function of their CBMs is lacking. RESULTS In this work, the CBM functions of CrXyl30 were investigated. CrXyl30 was a GH30 glucuronoxylanase containing tandem CBM13 (CrCBM13) and CBM2 (CrCBM2) at its C terminus, which was identified in a lignocellulolytic bacterial consortium previously. Both CBMs could bind insoluble and soluble xylan, with CrCBM13 having binding specificity for the xylan with L-arabinosyl substitutions, whereas CrCBM2 targeted L-arabinosyl side chains themselves. Such binding abilities of these two CBMs were completely different from other CBMs in their respective families. Phylogenetic analysis also suggested that both CrCBM13 and CrCBM2 belong to novel branches. Inspection of the simulated structure of CrCBM13 identified a pocket that just accommodates the side chain of 3(2)-alpha-L-arabinofuranosyl-xylotriose, which forms hydrogen bonds with three of the five amino acid residues involved in ligand interaction. The truncation of either CrCBM13 or CrCBM2 did not alter the substrate specificity and optimal reaction conditions of CrXyl30, whereas truncation of CrCBM2 decreased the kcat/Km value by 83% (± 0%). Moreover, the absence of CrCBM2 and CrCBM13 resulted in a 5% (± 1%) and a 7% (± 0%) decrease, respectively, in the amount of reducing sugar released by the synergistic hydrolysis of delignified corncob whose hemicellulose is arabinoglucuronoxylan, respectively. In addition, fusion of CrCBM2 with a GH10 xylanase enhanced its catalytic activity against the branched xylan and improved the synergistic hydrolysis efficiency by more than fivefold when delignified corncob was used as substrate. Such a strong stimulation of hydrolysis resulted from the enhancement of hemicellulose hydrolysis on the one hand, and the cellulose hydrolysis is also improved according to the lignocellulose conversion rate measured by HPLC. CONCLUSIONS This study identifies the functions of two novel CBMs in CrXyl30 and shows the good potential of such CBMs specific for branched ligands in the development of efficient enzyme preparations.
Collapse
Affiliation(s)
- Jiawen Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Jingrong Zhu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Qian Xu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Rui Shi
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Cong Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China.
| | - Di Sun
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China.
| | - Weijie Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No.101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China.
| |
Collapse
|
3
|
Liu J, Xu Q, Wu Y, Sun D, Zhu J, Liu C, Liu W. Carbohydrate-binding modules of ChiB and ChiC promote the chitinolytic system of Serratia marcescens BWL1001. Enzyme Microb Technol 2022; 162:110118. [DOI: 10.1016/j.enzmictec.2022.110118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 08/22/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022]
|
4
|
Liu J, Sun D, Zhu J, Liu C, Liu W. Carbohydrate-binding modules targeting branched polysaccharides: overcoming side-chain recalcitrance in a non-catalytic approach. BIORESOUR BIOPROCESS 2021; 8:28. [PMID: 38650221 PMCID: PMC10992016 DOI: 10.1186/s40643-021-00381-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 04/07/2021] [Indexed: 12/25/2022] Open
Abstract
Extensive decoration of backbones is a major factor resulting in resistance of enzymatic conversion in hemicellulose and other branched polysaccharides. Employing debranching enzymes is the main strategy to overcome this kind of recalcitrance at present. A carbohydrate-binding module (CBM) is a contiguous amino acid sequence that can promote the binding of enzymes to various carbohydrates, thereby facilitating enzymatic hydrolysis. According to previous studies, CBMs can be classified into four types based on their preference in ligand type, where Type III and IV CBMs prefer to branched polysaccharides than the linear and thus are able to specifically enhance the hydrolysis of substrates containing side chains. With a role in dominating the hydrolysis of branched substrates, Type III and IV CBMs could represent a non-catalytic approach in overcoming side-chain recalcitrance.
Collapse
Affiliation(s)
- Jiawen Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No. 101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Di Sun
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No. 101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Jingrong Zhu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No. 101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China
| | - Cong Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No. 101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China.
| | - Weijie Liu
- Jiangsu Key Laboratory of Phylogenomics & Comparative Genomics, School of Life Science, Jiangsu Normal University, No. 101, Shanghai Road, Tongshan New District, Xuzhou, 221116, Jiangsu, China.
| |
Collapse
|
5
|
Co-Immobilization of Xylanase and Scaffolding Protein onto an Immobilized Metal Ion Affinity Membrane. Catalysts 2020. [DOI: 10.3390/catal10121408] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Lignocellulosic biomass conversion technology seeks to convert agricultural waste to sugars through the use of various cellulases and hemicellulases. In practice, the application of free enzymes might increase the cost of the process due to difficulties with recovery of the enzymes and products. Immobilization might be an effective approach for recovering the hydrolysis products and improving the stability and reusability of the enzymes. In this study, we used a recombinant genetic engineering approach to construct a scaffold protein gene (CipA) and a xylanase gene (XynC) fused to a dockerin gene (DocT). After expressing CipA and XynC-DocT (XynCt) genes using E. coli hosts, the crude extracts were collected. An immobilized metal ion affinity membrane/Co2+ ion (IMAM-Co2+) system was prepared to adsorb CipA in its crude extract, thereby allowing simultaneous purification and immobilization of CipA protein. A similar approach was applied for the adsorption of XynCt protein, exploiting the interaction between the cohesin units in IMAM-Co2+-CipA and the dockerin unit in XynCt. The activity of the xylanase unit was enhanced in the presence of Co2+ for both the free XynCt enzymes and the immobilized CipA-XynCt. The heat resistance and stability over a wide range of values of pH of the immobilized CipA-XynCt were superior to those of the free XynCt. Furthermore, the immobilized CipA-XynCt retained approximately 80% of its initial activity after seven reaction cycles. The values of Km and νmax of IMAM-Co2+-CipA-XynCt (1.513 mg/mL and 3.831 U/mg, respectively) were the best among those of the other tested forms of XynCt.
Collapse
|
6
|
Significance of a family-6 carbohydrate-binding module in a modular feruloyl esterase for removing ferulic acid from insoluble wheat arabinoxylan. Enzyme Microb Technol 2020; 138:109546. [DOI: 10.1016/j.enzmictec.2020.109546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/23/2020] [Accepted: 03/03/2020] [Indexed: 11/21/2022]
|
7
|
Liu J, Yang J, Wang R, Liu L, Zhang Y, Bao H, Jang JM, Wang E, Yuan H. Comparative characterization of extracellular enzymes secreted by Phanerochaete chrysosporium during solid-state and submerged fermentation. Int J Biol Macromol 2020; 152:288-294. [DOI: 10.1016/j.ijbiomac.2020.02.256] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/22/2020] [Accepted: 02/23/2020] [Indexed: 01/22/2023]
|
8
|
Leng J, Huang F, Hai Y, Tian H, Liu W, Fang Y, Hu Y, Peng J. Amelioration of non-alcoholic steatohepatitis by Qushi Huayu decoction is associated with inhibition of the intestinal mitogen-activated protein kinase pathway. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2020; 66:153135. [PMID: 31790895 DOI: 10.1016/j.phymed.2019.153135] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 09/27/2019] [Accepted: 11/09/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Gut microbiota is increasingly recognized as the key participant in the pathogenesis of non-alcoholic fatty liver disease (NAFLD) by translocation of its products, such as lipopolysaccharide (LPS), via the dysfunctional intestinal barrier. Qushi Huayu decoction (QHD), a traditional Chinese medicine, is developed specially for NAFLD and used in clinic in China for more than a decade and previously found to ameliorate non-alcoholic steatohepatitis (NASH) induced by high-fat diet (HFD) in mice accompanied with inhibited metabolic endotoxemia and hepatic LPS signalling. PURPOSE To investigate the mechanism of LPS gut-leakage inhibition by QHD in NASH. METHODS Effects of QHD on gut microbioa and intestinal barrier were evaluated in NASH induced by HFD in mice. 16S rRNA sequencing is employed to analyse the gut microbiota composition. To identify the potential signalling pathway responsible for tight junction regulation, the colonic phosphoprotein profile is screened via the Phospho Explorer Antibody Array and verified in NASH, intestinal barrier dysfunctional mouse and Caco-2 cells. RESULTS QHD ameliorates NASH accompanied with regulating the gut microbiota composition, protecting intestinal tight junctions and inhibiting LPS gut-leakage without decreasing the abundance of identified Gram-negative bacteria. The validated data of phosphorylated proteins suggested that mitogen-activated protein kinase (MAPK) pathway is predominantly responsible for the colonic tight junction regulation by QHD. CONCLUSION QHD inhibits LPS gut-leakage in NASH, which is associated with downregulation of intestinal MAPK pathway.
Collapse
Affiliation(s)
- Jing Leng
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Fu Huang
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Yamei Hai
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Huajie Tian
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Wei Liu
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Yi Fang
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China
| | - Yiyang Hu
- Institute of Clinical Pharmacology, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China
| | - Jinghua Peng
- Institute of Liver diseases, Shuguang Hospital affiliated to Shanghai University of Traditional Chinese Medicine, 528, Zhangheng Road, Shanghai, China; Key Laboratory of Liver and Kidney Diseases (Shanghai University of Traditional Chinese Medicine), Ministry of Education, 528, Zhangheng Road, Shanghai, China; Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, 528, Zhangheng Road, Shanghai, China.
| |
Collapse
|
9
|
The modular arabinanolytic enzyme Abf43A-Abf43B-Abf43C from Ruminiclostridium josui consists of three GH43 modules classified in different subfamilies. Enzyme Microb Technol 2019; 124:23-31. [PMID: 30797476 DOI: 10.1016/j.enzmictec.2019.01.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 01/18/2019] [Accepted: 01/29/2019] [Indexed: 11/20/2022]
Abstract
The abnA gene from Ruminiclostridium josui encodes the large modular arabinanolytic enzyme, Abf43A-Abf43B-Abf43C, consisting of an N-terminal signal peptide, a Laminin_G_3 module, a GH43_22 module, a Laminin_G_3 module, a Big_4 module, a GH43_26 module, a GH43_34 module and a dockerin module in order with a calculated molecular weight of 204,108. Three truncated enzymes were recombinantly produced in Escherichia coli and biochemically characterized, RjAbf43A consisting of the first Laminin_G_3 module and GH43_22 module, RjAbf43B consisting of the second Laminin_G_3 module, Big_4 module and GH43_26 module, and RjAbf43C consisting of the GH43_34 module. RjAbf43A showed a strong α-l-arabinofuranosidase activity toward sugar beet arabinan, highly branched arabinan but not linear arabinan, thus it acted in the removal of arabinose side chains from sugar beet arabinan. By contrast, RjAbf43B showed a strong exo-α-1,5-l-arabinofuranosidase activity toward linear arabinan and arabinooligosaccharides whereas RjAbf43C showed low activity toward these substrates. Although RjAbf43B was activated by the presence of some metal ions such as Zn2+, Mg2+ and Ni2+, RjAbf43A was inhibited by these ions. RjAbf43A and RjAbf43B attacked sugar beet arabinan in a synergistic manner. By comparison, RjAbf43A-Abf43B containing both GH43_22 and GH43_26 modules showed lower hydrolytic activity toward sugar beet arabinan but higher activity toward sugar beet fiber than the sum of the individual activities of RjAbf43A and RjAbf43B, suggesting that the coexistence of two distinct GH43 modules in a single polypeptide is important for the efficient hydrolysis of an insoluble and natural polysaccharide but not a soluble substrate.
Collapse
|
10
|
Sakka M, Kunitake E, Kimura T, Sakka K. Function of a laminin_G_3 module as a carbohydrate-binding module in an arabinofuranosidase from Ruminiclostridium josui. FEBS Lett 2018; 593:42-51. [PMID: 30403289 DOI: 10.1002/1873-3468.13283] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 10/23/2018] [Accepted: 10/30/2018] [Indexed: 11/09/2022]
Abstract
Laminin_G_3 modules can exist together with family-43 catalytic modules of glycoside hydrolase (GH43), but their functions are unknown. Here, a laminin_G_3 module and a GH43 module derived from a Ruminiclostridium josui modular arabinofuranosidase Abf43A-Abf43B-Abf43C were produced individually as RjLG3 and RjGH43_22, respectively, or combined as RjGH43-1 to gain insights into their activities. Isothermal calorimetry analysis showed that RjLG3 has high affinity toward 32 -α-l-arabinofuranosyl-(1,5)-α-l-arabinotriose but not for α-1,5-linked arabinooligosaccharides, which suggests that RjLG3 interacts specifically with a branched arabinofuranosyl residue of an arabinooligosaccharide but not an arabinofuranosyl residue at the end of α-1,5-linked arabinooligosaccharides. RjGH43-1 (with CBM) shows higher activity toward sugar beet arabinan than RjGH43_22 (without CBM), which suggests that the LG3 module in RjGH43-1 plays an important role in substrate hydrolysis as a carbohydrate-binding module.
Collapse
Affiliation(s)
- Makiko Sakka
- Graduate School of Bioresources, Mie University, Tsu, Japan
| | - Emi Kunitake
- Graduate School of Bioresources, Mie University, Tsu, Japan
| | - Tetsuya Kimura
- Graduate School of Bioresources, Mie University, Tsu, Japan
| | - Kazuo Sakka
- Graduate School of Bioresources, Mie University, Tsu, Japan
| |
Collapse
|
11
|
Ruminiclostridium josui Abf62A-Axe6A: A tri-functional xylanolytic enzyme exhibiting α-l-arabinofuranosidase, endoxylanase, and acetylxylan esterase activities. Enzyme Microb Technol 2018; 117:1-8. [DOI: 10.1016/j.enzmictec.2018.05.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 05/25/2018] [Accepted: 05/25/2018] [Indexed: 12/30/2022]
|
12
|
Wang Y, Okugawa K, Kunitake E, Sakka M, Kimura T, Sakka K. Development of an efficient host-vector system of Ruminiclostridium josui. J Basic Microbiol 2018; 58:448-458. [PMID: 29388680 DOI: 10.1002/jobm.201700620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 12/23/2017] [Accepted: 12/30/2017] [Indexed: 01/22/2023]
Abstract
Although Ruminiclostridium josui (formerly Clostridium josui), a strictly anaerobic mesophilic cellulolytic bacterium, is a promising candidate for biomass utilization via consolidated bioprocessing, its host-vector system has not yet been established. The existence of a restriction and modification system is a significant barrier to the transformation of R. josui. Here, we partially purified restriction endonuclease RjoI from R. josui cell extract using column chromatography. Further characterization showed that RjoI is an isoschizomer of DpnI, recognizing the sequence 5'-Gmet ATC-3', where the A nucleotide is Dam-methylated. RjoI cleaved the recognition sequence between the A and T nucleotides, producing blunt ends. We then successfully introduced plasmids prepared from Escherichia coli C2925 (dam- /dcm- ) into R. josui by electroporation. The highest transformation efficiency of 6.6 × 103 transformants/μg of DNA was obtained using a square-wave pulse (750 V, 1 ms). When the R. josui cel48A gene, devoid of the dockerin-encoding region, cloned into newly developed plasmid pKKM801 was introduced into R. josui, a truncated form of RjCel48A, RjCel48AΔdoc, was detected in the culture supernatant but not in the intracellular fraction. This is the first report on the establishment of fundamental technology for molecular breeding of R. josui.
Collapse
Affiliation(s)
- Yayun Wang
- Graduate School of Bioresources, Mie University, Mie, Japan
| | - Kei Okugawa
- Graduate School of Bioresources, Mie University, Mie, Japan
| | - Emi Kunitake
- Graduate School of Bioresources, Mie University, Mie, Japan
| | - Makiko Sakka
- Graduate School of Bioresources, Mie University, Mie, Japan
| | - Tetsuya Kimura
- Graduate School of Bioresources, Mie University, Mie, Japan
| | - Kazuo Sakka
- Graduate School of Bioresources, Mie University, Mie, Japan
| |
Collapse
|
13
|
Orita T, Sakka M, Kimura T, Sakka K. Characterization of Ruminiclostridium josui arabinoxylan arabinofuranohydrolase, RjAxh43B, and RjAxh43B-containing xylanolytic complex. Enzyme Microb Technol 2017. [DOI: 10.1016/j.enzmictec.2017.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|