1
|
Li F, Liu Y, Liu Y, Li Y, Yu H. Heterologous expression and characterization of a novel lytic polysaccharide monooxygenase from Natrialbaceae archaeon and its application for chitin biodegradation. BIORESOURCE TECHNOLOGY 2022; 354:127174. [PMID: 35436543 DOI: 10.1016/j.biortech.2022.127174] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/12/2022] [Accepted: 04/13/2022] [Indexed: 06/14/2023]
Abstract
Lytic polysaccharide monooxygenases could enhance the enzymatic conversion of recalcitrant polysaccharides by glycoside hydrolases. This study reports the expression and identification of a novel AA10 LPMO from Natrialbaceae archaeon, named NaLPMO10A, as a C1 oxidizer of chitin. The optimal temperature and pH for NaLPMO10A activity were 40 °C and 9.0, respectively, and NaLPMO10A exhibited high thermostability and pH stability under alkaline conditions. NaLPMO10A was also highly tolerant and stable when treated with high concentration of metal ions (1 M). Moreover, metal ions (Na+, K+, Ca2+ and Mg2+) significantly promoted NaLPMO10A activity and improved the saccharification efficiency of chitin by 22.6%, 45.9%, 36.7% and 53.9%, respectively, compared to commercial chitinase alone. Together, the findings of this study fill a gap in archaeal LPMO research, and for the first time demonstrate that archaeal NaLPMO10A could be a promising enzyme for improving saccharification under extreme condition, with potential applications in biorefineries.
Collapse
Affiliation(s)
- Fei Li
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yuxin Liu
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yang Liu
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yanjun Li
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hongbo Yu
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| |
Collapse
|
2
|
Tan H, Miao R, Liu T, Yang L, Yang Y, Chen C, Lei J, Li Y, He J, Sun Q, Peng W, Gan B, Huang Z. A bifunctional cellulase-xylanase of a new Chryseobacterium strain isolated from the dung of a straw-fed cattle. Microb Biotechnol 2018; 11:381-398. [PMID: 29205864 PMCID: PMC5812240 DOI: 10.1111/1751-7915.13034] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Accepted: 11/10/2017] [Indexed: 12/17/2022] Open
Abstract
A new cellulolytic strain of Chryseobacterium genus was screened from the dung of a cattle fed with cereal straw. A putative cellulase gene (cbGH5) belonging to glycoside hydrolase family 5 subfamily 46 (GH5_46) was identified and cloned by degenerate PCR plus genome walking. The CbGH5 protein was overexpressed in Pichia pastoris, purified and characterized. It is the first bifunctional cellulase-xylanase reported in GH5_46 as well as in Chryseobacterium genus. The enzyme showed an endoglucanase activity on carboxymethylcellulose of 3237 μmol min-1 mg-1 at pH 9, 90 °C and a xylanase activity on birchwood xylan of 1793 μmol min-1 mg-1 at pH 8, 90 °C. The activity level and thermophilicity are in the front rank of all the known cellulases and xylanases. Core hydrophobicity had a positive effect on the thermophilicity of this enzyme. When similar quantity of enzymatic activity units was applied on the straws of wheat, rice, corn and oilseed rape, CbGH5 could obtain 3.5-5.0× glucose and 1.2-1.8× xylose than a mixed commercial cellulase plus xylanase of Novozymes. When applied on spent mushroom substrates made from the four straws, CbGH5 could obtain 9.2-15.7× glucose and 3.5-4.3× xylose than the mixed Novozymes cellulase+xylanase. The results suggest that CbGH5 could be a promising candidate for industrial lignocellulosic biomass conversion.
Collapse
Affiliation(s)
- Hao Tan
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Renyun Miao
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Tianhai Liu
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Lufang Yang
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Yumin Yang
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Chunxiu Chen
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Jianrong Lei
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Yuhui Li
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- College of Life SciencesSichuan UniversityChengduChina
| | - Jiabei He
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- College of Life SciencesSichuan UniversityChengduChina
| | - Qun Sun
- College of Life SciencesSichuan UniversityChengduChina
| | - Weihong Peng
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Bingcheng Gan
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| | - Zhongqian Huang
- National‐local Joint Engineering Laboratory of Breeding and Cultivation of Edible and Medicinal Fungi, Soil and Fertilizer InstituteSichuan Academy of Agricultural SciencesChengduChina
- Scientific Observing and Experimental Station of Agro‐microbial Resource and Utilization in Southwest ChinaMinistry of AgricultureChengduChina
| |
Collapse
|
3
|
A novel mechanism of protein thermostability: a unique N-terminal domain confers heat resistance to Fe/Mn-SODs. Sci Rep 2014; 4:7284. [PMID: 25445927 PMCID: PMC4250934 DOI: 10.1038/srep07284] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 11/14/2014] [Indexed: 11/22/2022] Open
Abstract
Superoxide dismutases (SODs), especially thermostable SODs, are widely applied in medical treatments, cosmetics, food, agriculture, and other industries given their excellent antioxidant properties. A novel thermostable cambialistic SOD from Geobacillus thermodenitrificans NG80-2 exhibits maximum activity at 70°C and high thermostability over a broad range of temperatures (20–80°C). Unlike other reported SODs, this enzyme contains an extra repeat-containing N-terminal domain (NTD) of 244 residues adjacent to the conserved functional SODA domain. Deletion of the NTD dramatically decreased its optimum active temperature (OAT) to 30°C and also impaired its thermostability. Conversely, appending the NTD to a mesophilic counterpart from Bacillus subtilis led to a moderately thermophilic enzyme (OAT changed from 30 to 55°C) with improved heat resistance. Temperature-dependant circular dichroism analysis revealed the enhanced conformational stability of SODs fused with this NTD. Furthermore, the NTD also contributes to the stress resistance of host proteins without altering their metal ion specificity or oligomerisation form except for a slight effect on their pH profile. We therefore demonstrate that the NTD confers outstanding thermostability to the host protein. To our knowledge, this is the first discovery of a peptide capable of remarkably improving protein thermostability and provides a novel strategy for bioengineering thermostable SODs.
Collapse
|
4
|
Rahman MM, Inoue A, Ojima T. Characterization of a GHF45 cellulase, AkEG21, from the common sea hare Aplysia kurodai. Front Chem 2014; 2:60. [PMID: 25147784 PMCID: PMC4123733 DOI: 10.3389/fchem.2014.00060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 07/15/2014] [Indexed: 11/18/2022] Open
Abstract
The common sea hare Aplysia kurodai is known to be a good source for the enzymes degrading seaweed polysaccharides. Recently four cellulases, i.e., 95, 66, 45, and 21 kDa enzymes, were isolated from A. kurodai (Tsuji et al., 2013). The former three cellulases were regarded as glycosyl-hydrolase-family 9 (GHF9) enzymes, while the 21 kDa cellulase was suggested to be a GHF45 enzyme. The 21 kDa cellulase was significantly heat stable, and appeared to be advantageous in performing heterogeneous expression and protein-engineering study. In the present study, we determined some enzymatic properties of the 21 kDa cellulase and cloned its cDNA to provide the basis for the protein engineering study of this cellulase. The purified 21 kDa enzyme, termed AkEG21 in the present study, hydrolyzed carboxymethyl cellulose with an optimal pH and temperature at 4.5 and 40°C, respectively. AkEG21 was considerably heat-stable, i.e., it was not inactivated by the incubation at 55°C for 30 min. AkEG21 degraded phosphoric-acid-swollen cellulose producing cellotriose and cellobiose as major end products but hardly degraded oligosaccharides smaller than tetrasaccharide. This indicated that AkEG21 is an endolytic β-1,4-glucanase (EC 3.2.1.4). A cDNA of 1013 bp encoding AkEG21 was amplified by PCR and the amino-acid sequence of 197 residues was deduced. The sequence comprised the initiation Met, the putative signal peptide of 16 residues for secretion and the catalytic domain of 180 residues, which lined from the N-terminus in this order. The sequence of the catalytic domain showed 47–62% amino-acid identities to those of GHF45 cellulases reported in other mollusks. Both the catalytic residues and the N-glycosylation residues known in other GHF45 cellulases were conserved in AkEG21. Phylogenetic analysis for the amino-acid sequences suggested the close relation between AkEG21 and fungal GHF45 cellulases.
Collapse
Affiliation(s)
- Mohammad M Rahman
- Laboratory of Marine Biotechnology and Microbiology, Division of Applied Marine Life Science, Graduate School of Fisheries Sciences, Hokkaido University Hakodate, Japan ; Department of Fisheries Biology and Genetics, Bangladesh Agricultural University Mymensingh, Bangladesh
| | - Akira Inoue
- Laboratory of Marine Biotechnology and Microbiology, Division of Applied Marine Life Science, Graduate School of Fisheries Sciences, Hokkaido University Hakodate, Japan
| | - Takao Ojima
- Laboratory of Marine Biotechnology and Microbiology, Division of Applied Marine Life Science, Graduate School of Fisheries Sciences, Hokkaido University Hakodate, Japan
| |
Collapse
|
5
|
|
6
|
Lu H, Luo H, Shi P, Huang H, Meng K, Yang P, Yao B. A novel thermophilic endo-β-1,4-mannanase from Aspergillus nidulans XZ3: functional roles of carbohydrate-binding module and Thr/Ser-rich linker region. Appl Microbiol Biotechnol 2013; 98:2155-63. [DOI: 10.1007/s00253-013-5112-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 07/08/2013] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
|
7
|
Zhao J, Shi P, Huang H, Li Z, Yuan T, Yang P, Luo H, Bai Y, Yao B. A novel thermoacidophilic and thermostable endo-β-1,4-glucanase from Phialophora sp. G5: its thermostability influenced by a distinct β-sheet and the carbohydrate-binding module. Appl Microbiol Biotechnol 2011; 95:947-55. [DOI: 10.1007/s00253-011-3807-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2011] [Revised: 10/29/2011] [Accepted: 12/01/2011] [Indexed: 10/14/2022]
|
8
|
Yin Q, Teng Y, Ding M, Zhao F. Site-directed mutagenesis of aromatic residues in the carbohydrate-binding module of Bacillus endoglucanase EGA decreases enzyme thermostability. Biotechnol Lett 2011; 33:2209-16. [PMID: 21720844 DOI: 10.1007/s10529-011-0680-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 06/20/2011] [Indexed: 11/28/2022]
Abstract
The endoglucanase, EGA, from Bacillus sp. AC-1 comprises a glycosyl hydrolase family-9 catalytic module (CM9) and a family-3 carbohydrate-binding module (CBM3). Seven aromatic residues were subjected to site-directed mutagenesis in both CBM3 and EGA to investigate their roles in enzyme thermostability. The complexes generated by mixing CBMY527G, CBMW532A, or CBMF592G with CM9 each lost their activities after 15 min at 45°C, while the wild-type complex retained >70% activity after 2 h. The mutants EGAY527G, EGAW532A, and EGAF592G showed little activity after 15 min at 60°C, whereas EGA remained 70% active after 2 h. Thus the residues Tyr(527), Trp(532), and Phe(592) contribute not only to CBM3-mediated stability of CM9 but also to EGA thermostability suggesting that hydrophobic interaction between the two modules, independent of covalent linkages, is important for enzyme thermostability.
Collapse
Affiliation(s)
- Qiuyu Yin
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Shanghai, China
| | | | | | | |
Collapse
|
9
|
Expression and characterization of full-length Ampullaria crossean endoglucanase EG65s and their two functional modules. Biosci Biotechnol Biochem 2011; 75:240-6. [PMID: 21307602 DOI: 10.1271/bbb.100529] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Three endoglucanase cDNAs, eg65a, eg65b, and eg65c, were cloned from the mollusk Ampullaria crossean in previous work. To characterize the full-length enzymes as well as their individual functional modules via heterologous expression analysis, the three full-length putative endoglucanases (rEG65a, rEG65b, and rEG65c) and the corresponding catalytic modules (EG65a-CM, EG65b-CM, and EG65c-CM) were expressed in Pichia pastoris GS115, and the three corresponding carbohydrate-binding modules (EG65a-CBM, EG65b-CBM, and EG65c-CBM) were expressed in Escherichia coli BL21 (DE3). The properties of recombinant rEG65b, EG65a-CM, EG65b-CM, and EG65c-CM were characterized. Binding assays of CBMs with insoluble polysaccharides indicated that both EG65b-CBM and EG65c-CBM bound to phosphoric-acid swollen cellulose (PASC), Avicel, and oat-spelt xylan, while EG65a-CBM did not. The relative equilibrium constants (K(r)) of EG65b-CBM and EG65c-CBM were determined by absorption isotherm measurements. In this study, the CBMs of animal cellulases were expressed and characterized for the first time.
Collapse
|
10
|
Molecular insight into lignocellulose digestion by a marine isopod in the absence of gut microbes. Proc Natl Acad Sci U S A 2010; 107:5345-50. [PMID: 20212162 DOI: 10.1073/pnas.0914228107] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The digestion of lignocellulose is attracting attention both in terms of basic research into its metabolism by microorganisms and animals, and also as a means of converting plant biomass into biofuels. Limnoriid wood borers are unusual because, unlike other wood-feeding animals, they do not rely on symbiotic microbes to help digest lignocellulose. The absence of microbes in the digestive tract suggests that limnoriid wood borers produce all the enzymes necessary for lignocellulose digestion themselves. In this study we report that analysis of ESTs from the digestive system of Limnoria quadripunctata reveals a transcriptome dominated by glycosyl hydrolase genes. Indeed, > 20% of all ESTs represent genes encoding putative cellulases, including glycosyl hydrolase family 7 (GH7) cellobiohydrolases. These have not previously been reported in animal genomes, but are key digestive enzymes produced by wood-degrading fungi and symbiotic protists in termite guts. We propose that limnoriid GH7 genes are important for the efficient digestion of lignocellulose in the absence of gut microbes. Hemocyanin transcripts were highly abundant in the hepatopancreas transcriptome. Based on recent studies indicating that these proteins may function as phenoloxidases in isopods, we discuss a possible role for hemocyanins in lignin decomposition.
Collapse
|
11
|
Ding M, Teng Y, Yin Q, Chen W, Zhao F. Identification, expression, and characterization of the highly conserved D-xylose isomerase in animals. Acta Biochim Biophys Sin (Shanghai) 2009; 41:116-22. [PMID: 19204828 DOI: 10.1093/abbs/gmn013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
D-xylose is a necessary sugar for animals. The xylanase from a mollusk, Ampullaria crossean, was previously reported by our laboratory. This xylanase can degrade the xylan into D-xylose. But there is still a gap in our knowledge on its metabolic pathway. The question is how does the xylose enter the pentose pathway? With the help of genomic databases and bioinformatic tools, we found that some animals, such as bacteria, have a highly conserved D-xylose isomerase (EC 5.3.1.5). The xylose isomerase from a sea squirt, Ciona intestinali, was heterogeneously expressed in Escherichia coli and purified to confirm its function. The recombinant enzyme had good thermal stability in the presence of Mg(2+). At the optimum temperature and optimum pH environment, its specific activity on D-xylose was 0.331 micromol/mg/min. This enzyme exists broadly in many animals, but it disappeared in the genome of Amphibia-like Xenopus laevis. Its sequence was highly conserved. The xylose isomerases from animals are very interesting proteins for the study of evolution.
Collapse
Affiliation(s)
- Ming Ding
- Key Laboratory of Proteomics, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
| | | | | | | | | |
Collapse
|