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Zhang Y, Zheng L, Liu G, Shen J, Chen G, Mei X, Chang Y, Xue C. The α-linkage in funoran and agarose could be hydrolyzed by a GH96 family enzyme: Discovery of the α-funoranase. Carbohydr Polym 2024; 338:122201. [PMID: 38763726 DOI: 10.1016/j.carbpol.2024.122201] [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: 11/01/2023] [Revised: 03/27/2024] [Accepted: 04/22/2024] [Indexed: 05/21/2024]
Abstract
Agarans represent a group of galactans extracted from red algae. Funoran and agarose are the two major types and commercially applied polysaccharides of agaran. Although the glycoside hydrolases targeting β-glycosidic bonds of agaran have been widely investigated, those capable of degrading α-glycosidic bonds of agarose were limited, and the enzyme degrading α-linkages of funoran has not been reported till now. In this study, a GH96 family enzyme BiAF96A_Aq from a marine bacterium Aquimarina sp. AD1 was heterologously expressed in Escherichia coli. BiAF96A_Aq exhibited dual activities towards the characteristic structure of funoran and agarose, underscoring the multifunctionality of GH96 family members. Glycomics and NMR analysis revealed that BiAF96A_Aq hydrolyzed the α-1,3 glycosidic bonds between 3,6-anhydro-α-l-galactopyranose (LA) and β-d-galactopyranose-6-sulfate (G6S) of funoran, as well as LA and β-d-galactopyranose (G) of agarose, through an endo-acting manner. The end products of BiAF96A_Aq were majorly composed of disaccharides and tetrasaccharides. The identification of the activity of BiAF96A_Aq on funoran indicated the first discovery of the funoran hydrolase for α-1,3 linkage. Considering the novel catalytic reaction, we proposed to name this activity as "α-funoranase" and recommended the assignment of a dedicated EC number for its classification.
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Affiliation(s)
- Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Long Zheng
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Guanchen Liu
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Jingjing Shen
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Guangning Chen
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Xuanwei Mei
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China; Qingdao Marine Science and Technology Center, 1 Wenhai Road, Qingdao 266237, China.
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China; Qingdao Marine Science and Technology Center, 1 Wenhai Road, Qingdao 266237, China
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2
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Yu B, Lu Z, Zhong S, Cheong KL. Exploring potential polysaccharide utilization loci involved in the degradation of typical marine seaweed polysaccharides by Bacteroides thetaiotaomicron. Front Microbiol 2024; 15:1332105. [PMID: 38800758 PMCID: PMC11119289 DOI: 10.3389/fmicb.2024.1332105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 04/24/2024] [Indexed: 05/29/2024] Open
Abstract
Introduction Research on the mechanism of marine polysaccharide utilization by Bacteroides thetaiotaomicron has drawn substantial attention in recent years. Derived from marine algae, the marine algae polysaccharides could serve as prebiotics to facilitate intestinal microecological balance and alleviate colonic diseases. Bacteroides thetaiotaomicron, considered the most efficient degrader of polysaccharides, relates to its capacity to degrade an extensive spectrum of complex polysaccharides. Polysaccharide utilization loci (PULs), a specialized organization of a collection of genes-encoded enzymes engaged in the breakdown and utilization of polysaccharides, make it possible for Bacteroides thetaiotaomicron to metabolize various polysaccharides. However, there is still a paucity of comprehensive studies on the procedure of polysaccharide degradation by Bacteroides thetaiotaomicron. Methods In the current study, the degradation of four kinds of marine algae polysaccharides, including sodium alginate, fucoidan, laminarin, and Pyropia haitanensis polysaccharides, and the underlying mechanism by Bacteroides thetaiotaomicron G4 were investigated. Pure culture of Bacteroides thetaiotaomicron G4 in a substrate supplemented with these polysaccharides were performed. The change of OD600, total carbohydrate contents, and molecular weight during this fermentation were determined. Genomic sequencing and bioinformatic analysis were further performed to elucidate the mechanisms involved. Specifically, Gene Ontology (GO) annotation, Clusters of Orthologous Groups (COG) annotation, and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment were utilized to identify potential target genes and pathways. Results Underlying target genes and pathways were recognized by employing bioinformatic analysis. Several PULs were found that are anticipated to participate in the breakdown of these four polysaccharides. These findings may help to understand the interactions between these marine seaweed polysaccharides and gut microorganisms. Discussion The elucidation of polysaccharide degradation mechanisms by Bacteroides thetaiotaomicron provides valuable insights into the utilization of marine polysaccharides as prebiotics and their potential impact on gut health. Further studies are warranted to explore the specific roles of individual PULs and their contributions to polysaccharide metabolism in the gut microbiota.
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Affiliation(s)
- Biao Yu
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Provincial Science and Technology Innovation Center for Subtropical Fruit and Vegetable Processing, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang, China
- Department of Biology, College of Science, Shantou University, Shantou, China
| | - Zheng Lu
- School of Life and Health Sciences, Hainan University, Haikou, China
| | - Saiyi Zhong
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Provincial Science and Technology Innovation Center for Subtropical Fruit and Vegetable Processing, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang, China
| | - Kit-Leong Cheong
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Provincial Science and Technology Innovation Center for Subtropical Fruit and Vegetable Processing, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang, China
- Department of Biology, College of Science, Shantou University, Shantou, China
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Mei X, Zhang Y, Jiang X, Liu G, Shen J, Xue C, Xiao H, Chang Y. Discovery and characterization of a novel carbohydrate-binding module: a favorable tool for investigating agarose. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:2792-2797. [PMID: 38010608 DOI: 10.1002/jsfa.13164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 11/21/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
BACKGROUND Agarose, mainly composed of 3,6-anhydro-α-l-galactopyranose (LA) and β-d-galactopyranose (G) units, is an important polysaccharide with wide applications in food, biomedical and bioengineering industries. Carbohydrate-binding modules (CBMs) are favorable tools for the investigations of polysaccharides. Few agarose-binding CBMs have been hitherto reported, and their binding specificity is unclear. RESULTS An unknown domain with a predicted β-sandwich fold was discovered from a β-agarase of the marine bacterium Wenyingzhuangia fucanilytica CZ1127T . The expressed protein WfCBM101 could bind to agarose and exhibited relatively weak affinity for porphyran, with no affinity for the other seven examined polysaccharides. The protein binds to the tetrasaccharide (LA-G)2 , but not to the major tetrasaccharide contained in porphyran. The sequence novelty and well-defined binding function of WfCBM101 shed light on a novel CBM family (CBM101). Furthermore, the feasibility of WfCBM101 for visualizing agarose in situ was confirmed. CONCLUSION A novel CBM, WfCBM101, with a desired specificity for agarose was discovered and characterized, which represents a new CBM family. The CBM could be utilized as a promising tool for studies of agarose. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Xuanwei Mei
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Xiaoxiao Jiang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Guanchen Liu
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Jingjing Shen
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Hang Xiao
- Department of Food Science, University of Massachusetts, Amherst, MA, USA
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
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4
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Sun Y, Li L, Zhang Y, Xue C, Chang Y. An enzyme-pHBH method for specific quantification of porphyran. Int J Biol Macromol 2024; 257:128530. [PMID: 38042319 DOI: 10.1016/j.ijbiomac.2023.128530] [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: 09/25/2023] [Revised: 11/18/2023] [Accepted: 11/29/2023] [Indexed: 12/04/2023]
Abstract
Porphyran, the major polysaccharide extracted from Porphyra, exhibits tremendous potential for development as functional food or pharmaceutical due to its multiple biological activities. The quantitative analysis of porphyran is important for the quality control in product development. However, the specific quantitative method of porphyran has not been established, and the lack of reference substance makes the quantification more challenging. Here, a common component of porphyran, with high purity, similar molecular weight distribution, sourced from different Porphyra producing areas in China was first prepared by a series of isolation and purification steps, and utilized as the reference substance for porphyran quantification. Subsequently, the porphyran was fully degraded into oligosaccharides by using a β-porphyranase, followed by employing para-hydroxybenzoic acid hydrazide (pHBH) method to detect the content of the generated reducing sugar. The enzyme-pHBH method for porphyran specific quantification was established. Results showed that this method was validated with good linearity, high accuracy and precision, and reliability. Addtionally, NaCl with a concentration below 0.5 %, alcohol under 8 % and other polysaccharide including chitosan, agarose, chondrotin sulfate, alginate, hyaluronic acid and κ-carrageenan did not interfere with this method. This approach is promising for quality control of the porphyran products and offers a feasible strategy for the specific quantification of other polysaccharides.
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Affiliation(s)
- Yuhao Sun
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Marine Life Research Center, Laoshan Laboratory, 1 Wenhai Road, Qingdao 266237, China
| | - Ling Li
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Marine Life Research Center, Laoshan Laboratory, 1 Wenhai Road, Qingdao 266237, China
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Marine Life Research Center, Laoshan Laboratory, 1 Wenhai Road, Qingdao 266237, China.
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5
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Zhang Y, Chen G, Shen J, Mei X, Liu G, Chang Y, Dong S, Feng Y, Wang Y, Xue C. The characteristic structure of funoran could be hydrolyzed by a GH86 family enzyme (Aga86A_Wa): Discovery of the funoran hydrolase. Carbohydr Polym 2023; 318:121117. [PMID: 37479453 DOI: 10.1016/j.carbpol.2023.121117] [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: 03/24/2023] [Revised: 05/19/2023] [Accepted: 06/09/2023] [Indexed: 07/23/2023]
Abstract
Funoran, agarose and porphyran all belong to agaran, and share the similar skeleton. Although the glycoside hydrolase for agarose and porphyran, i.e. agarase and porphyranase, have been extensively studied, the enzyme hydrolyzing funoran has not been reported hitherto. The crystal structure of a previously characterized GH86 β-agarase Aga86A_Wa showed a large cavity at subsite -1, which implied its ability to accommodate sulfate ester group. By using glycomics and NMR analysis, the activity of Aga86A_Wa on the characteristic structure of funoran was validated, which signified the first discovery of funoran hydrolase, i.e. funoranase. Aga86A_Wa hydrolyzed the β-1,4 glycosidic bond between β-d-galactopyranose-6-sulfate (G6S) and 3,6-anhydro-α-l-galactopyranose (LA) unit of funoran, and released disaccharide LA-G6S as the predominant end product. Considering the hydrolysis pattern, we proposed to name the activity represented by Aga86A_Wa on funoran as "β-funoranase" and suggested to assign it an EC number.
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Affiliation(s)
- Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Guangning Chen
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Jingjing Shen
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Xuanwei Mei
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Guanchen Liu
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China.
| | - Sheng Dong
- CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China; Shandong Energy Institute, Qingdao 266101, PR China; Qingdao New Energy Shandong Laboratory, Qingdao 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yingang Feng
- CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China; Shandong Energy Institute, Qingdao 266101, PR China; Qingdao New Energy Shandong Laboratory, Qingdao 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yanchao Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, Qingdao 266404, PR China
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6
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Jiang C, Secundo F, Mao X. Expanding the application range of the κ‑carrageenase OUC-FaKC16A when preparing oligosaccharides from κ-carrageenan and furcellaran. MARINE LIFE SCIENCE & TECHNOLOGY 2023; 5:387-399. [PMID: 37637255 PMCID: PMC10449746 DOI: 10.1007/s42995-023-00181-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 05/10/2023] [Indexed: 08/29/2023]
Abstract
Carrageenan oligosaccharides are important products that have demonstrated numerous bioactivities useful in the food, medicine, and cosmetics industries. However, the specific structure-function relationships of carrageenan oligosaccharides are not clearly described due to the deficiency of high specific carrageenases. Here, a truncated mutant OUC-FaKC16Q based on the reported κ-neocarratetrose (Nκ4)-producing κ-carrageenase OUC-FaKC16A from Flavobacterium algicola was constructed and further studied. After truncating the C-terminal Por_Secre_tail (PorS) domain (responsible for substrate binding), the catalytic efficiency and temperature stability decreased to a certain extent. Surprisingly, this truncation also enabled OUC-FaKC16Q to hydrolyze Nκ4 into κ-neocarrabiose (Nκ2). The offset of Arg265 residue in OUC-FaKC16Q may explain this change. Moreover, the high catalytic abilities, the main products, and the degradation modes of OUC-FaKC16A and OUC-FaKC16Q toward furcellaran were also demonstrated. Data suggested OUC-FaKC16A and OUC-FaKC16Q could hydrolyze furcellaran to produce mainly the desulfated oligosaccharides DA-G-(DA-G4S)2 and DA-G-DA-G4S, respectively. As a result, the spectrum of products of κ-carrageenase OUC-FaKC16A has been fully expanded in this study, indicating its promising potential for application in the biomanufacturing of carrageenan oligosaccharides with specific structures. Supplementary Information The online version contains supplementary material available at 10.1007/s42995-023-00181-2.
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Affiliation(s)
- Chengcheng Jiang
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003 China
- Key Laboratory for Biological Processing of Aquatic Products, China National Light Industry, Qingdao, 266237 China
| | - Francesco Secundo
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche, Via Mario Bianco 9, 20131 Milan, Italy
| | - Xiangzhao Mao
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
- Key Laboratory for Biological Processing of Aquatic Products, China National Light Industry, Qingdao, 266237 China
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7
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Zhang Y, Dong S, Chen G, Cao S, Shen J, Mei X, Cui Q, Feng Y, Chang Y, Wang Y, Xue C. Structural characterization on a β-agarase Aga86A_Wa from Wenyingzhuangia aestuarii reveals the prevalent methyl-galactose accommodation capacity of GH86 enzymes at subsite -1. Carbohydr Polym 2023; 306:120594. [PMID: 36746585 DOI: 10.1016/j.carbpol.2023.120594] [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: 11/15/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 01/19/2023]
Abstract
Agarans are sulfated galactans extracted from red algae with high structural complexity, of which natural methylation often occurs on the O-6 position of its β-d-galactopyranose units. Although many agaran degrading enzymes, including agarases and porphyranases, have been characterized, little attention has been paid to the tolerance of methyl groups at cleavage subsites. In this study, the structure of GH86 β-agarase Aga86A_Wa from Wenyingzhuangia aestuarii was determined by X-ray crystallography and investigated from a structural biology perspective. The structure indicated that an accommodation pocket formed by F367, Y280, and Q326 at subsite -1 contributes to the methyl-galactose tolerance of Aga86A_Wa. Furthermore, we found that similar accommodation pockets were present in the structures of two other GH86 enzymes BuGH86 from Bacteroides uniformis and BpGH86A from Phocaeicola plebeius, and their previously undisclosed methyl-galactose tolerance was verified, validating the function of the pockets. Phylogenetic analysis, structural modeling, and hydrolysis product characterization suggested that the methyl-galactose accommodation capacity at subsite -1 was prevalent in GH86 members. These findings achieve a better understanding of the function and mechanism of GH86 agaran degrading enzymes, and will facilitate the precise preparation of agaran oligosaccharides by employing defined tools.
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Affiliation(s)
- Yuying Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Sheng Dong
- CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China; Shandong Energy Institute, Qingdao 266101, PR China; Qingdao New Energy Shandong Laboratory, Qingdao 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Guangning Chen
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Siqi Cao
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Jingjing Shen
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Xuanwei Mei
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Qiu Cui
- CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China; Shandong Energy Institute, Qingdao 266101, PR China; Qingdao New Energy Shandong Laboratory, Qingdao 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yingang Feng
- CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, PR China; Shandong Energy Institute, Qingdao 266101, PR China; Qingdao New Energy Shandong Laboratory, Qingdao 266101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Yaoguang Chang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China; Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China.
| | - Yanchao Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, PR China; Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China
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8
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Manat G, Fanuel M, Jouanneau D, Jam M, Mac-Bear J, Rogniaux H, Mora T, Larocque R, Lipinska A, Czjzek M, Ropartz D, Ficko-Blean E. Specificity of a β-porphyranase produced by the carrageenophyte red alga Chondrus crispus and implications of this unexpected activity on red algal biology. J Biol Chem 2022; 298:102707. [PMID: 36402445 PMCID: PMC9771727 DOI: 10.1016/j.jbc.2022.102707] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 11/03/2022] [Accepted: 11/08/2022] [Indexed: 11/18/2022] Open
Abstract
The carrageenophyte red alga Chondrus crispus produces three family 16 glycoside hydrolases (CcGH16-1, CcGH16-2, and CcGH16-3). Phylogenetically, the red algal GH16 members are closely related to bacterial GH16 homologs from subfamilies 13 and 14, which have characterized marine bacterial β-carrageenase and β-porphyranase activities, respectively, yet the functions of these CcGH16 hydrolases have not been determined. Here, we first confirmed the gene locus of the ccgh16-3 gene in the alga to facilitate further investigation. Next, our biochemical characterization of CcGH16-3 revealed an unexpected β-porphyranase activity, since porphyran is not a known component of the C. crispus extracellular matrix. Kinetic characterization was undertaken on natural porphyran substrate with an experimentally determined molecular weight. We found CcGH16-3 has a pH optimum between 7.5 and 8.0; however, it exhibits reasonably stable activity over a large pH range (pH 7.0-9.0). CcGH16-3 has a KM of 4.0 ± 0.8 μM, a kcat of 79.9 ± 6.9 s-1, and a kcat/KM of 20.1 ± 1.7 μM-1 s-1. We structurally examined fine enzymatic specificity by performing a subsite dissection. CcGH16-3 has a strict requirement for D-galactose and L-galactose-6-sulfate in its -1 and +1 subsites, respectively, whereas the outer subsites are less restrictive. CcGH16-3 is one of a handful of algal enzymes characterized with a specificity for a polysaccharide unknown to be found in their own extracellular matrix. This β-porphyranase activity in a carrageenophyte red alga may provide defense against red algal pathogens or provide a competitive advantage in niche colonization.
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Affiliation(s)
- Guillaume Manat
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France
| | - Mathieu Fanuel
- INRAE, UR BIA, Nantes, France,INRAE, BIBS Facility, Nantes, France
| | - Diane Jouanneau
- CNRS, FR 2424, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Murielle Jam
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France
| | | | - Hélène Rogniaux
- INRAE, UR BIA, Nantes, France,INRAE, BIBS Facility, Nantes, France
| | - Théo Mora
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France
| | - Robert Larocque
- CNRS, FR 2424, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Agnieszka Lipinska
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France
| | - Mirjam Czjzek
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France
| | - David Ropartz
- INRAE, UR BIA, Nantes, France,INRAE, BIBS Facility, Nantes, France
| | - Elizabeth Ficko-Blean
- CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Sorbonne Université, Roscoff, France,For correspondence: Elizabeth Ficko-Blean
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9
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A Novel Carrageenan Metabolic Pathway in Flavobacterium algicola. Appl Environ Microbiol 2022; 88:e0110022. [PMID: 36036580 PMCID: PMC9499021 DOI: 10.1128/aem.01100-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Carbohydrate-active enzymes are important components of the polysaccharide metabolism system in marine bacteria. Carrageenase is indispensable for forming carrageenan catalytic pathways. Here, two GH16_13 carrageenases showed likely hydrolysis activities toward different types of carrageenans (e.g., κ-, hybrid β/κ, hybrid α/ι, and hybrid λ), which indicates that a novel pathway is present in the marine bacterium Flavobacterium algicola to use κ-carrageenan (KC), ι-carrageenan (IC), and λ-carrageenan (LC). A comparative study described the different features with another reported pathway based on the specific carrageenans (κ, ι, and λ) and expanded the carrageenan metabolic versatility in F. algicola. A further comparative genomic analysis of carrageenan-degrading bacteria indicated different distributions of carrageenan metabolism-related genes in marine bacteria. The crucial core genes encoding the GH127 α-3,6-anhydro-d-galactosidase (ADAG) and 3,6-anhydro-d-galactose (d-AHG)-utilized cluster have been conserved during evolution. This analysis further revealed the horizontal gene transfer (HGT) phenomenon of the carrageenan polysaccharide utilization loci (CarPUL) from Bacteroidetes to other bacterial phyla, as well as the versatility of carrageenan catalytic activities in marine bacteria through different metabolic pathways. IMPORTANCE Based on the premise that the specific carrageenan-based pathway involved in carrageenan use by Flavobacterium algicola has been identified, another pathway was further analyzed, and it involved two GH16_13 carrageenases. Among all the characterized carrageenases, the members of GH16_13 accounted for only a small portion. Here, the functional analysis of two GH16_13 carrageenases suggested their hydrolysis effects on different types of carrageenans (e.g., κ, hybrid β/κ, hybrid α/ι-, and hybrid λ-), which led to the identification of another pathway. Further exploration enabled us to elucidate the novel pathway that metabolizes KC and IC in F. algicola successfully. The coexistence of these two pathways may provide improved survivability by F. algicola in the marine environment.
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Fermentation optimization, purification and biochemical characterization of a porphyran degrading enzyme with funoran side-activity from Zobellia uliginosa. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2022. [DOI: 10.1016/j.bcab.2022.102394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Li C, Cheng X, Cao W, Wang Y, Xue C, Tang Q. Enzymatic hydrolysate of porphyra enhances the intestinal mucosal functions in obese mice. J Food Biochem 2022; 46:e14175. [PMID: 35510340 DOI: 10.1111/jfbc.14175] [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: 01/06/2022] [Revised: 03/13/2022] [Accepted: 03/28/2022] [Indexed: 11/30/2022]
Abstract
Intestinal mucosal immunity is important to human body; however, obesity induced by high-fat diet may bring a series of problems, such as chronic inflammation which may damage intestinal mucosal immunity. In this study, the effects of two different enzymatic hydrolysates of porphyra on the function of intestinal mucosal were explored in obese mice. The results showed that 10 consecutive weeks of high-fat dietary intake resulted in weight gain and intestinal abnormalities in C57BL/6 mice. However, the administration of enzymatic hydrolysate of porphyra effectively protected the intestinal mucosa from these injuries while reducing levels of oxidative stress (MDA, GSH, and GSH-Px). Specifically, they were found to improve small intestine morphological structure, increase growth of goblet cells and mucous, raise expression levels of lysozyme, and stimulate SIgA secretion, especially in the group administered with the enzymatic hydrolysate containing protease and polysaccharide enzyme (EHPP). The results showed that the enzymatic hydrolysates of porphyra may provide a protective measure to maintain intestinal mucosal barriers, which is beneficial to overall health. Porphyra is widely distributed all over the world. Moreover, an increasing number of studies have described its diverse biological functions. Therefore, it is necessary to find a way to develop products related to porphyra. In this study, a new type of polysaccharide enzyme of porphyra found in our previous research was used to make a clear porphyra energy drink with a lower molecular weight polysaccharide. Our findings highlighted the repaired intestinal barriers in obese bodies after the treatment with the enzymatic hydrolysate. PRACTICAL APPLICATIONS: Porphyra is widely distributed all over the world. Moreover, an increasing number of studies have described its diverse biological functions. Therefore, it is necessary to find a way to develop products related to porphyra. In this study, a new type of polysaccharide enzyme of porphyra found in our previous research was used to make a clear porphyra energy drink with a lower molecular weight polysaccharide. Our findings highlighted the repaired intestinal barriers in obese bodies after the treatment with the enzymatic hydrolysate.
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Affiliation(s)
- Chunjun Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Xiaojie Cheng
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Wanxiu Cao
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Yuming Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, P. R. China
| | - Changhu Xue
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, P. R. China
| | - Qingjuan Tang
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
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Song T, Liu L, Tang Q, Xiang S, Wang B, Zhang S, Wang X, Chu Y, Luo D, Lin J. Antioxidant neoagarooligosaccharides (NAOs) and dietary fiber production from red algae Gracilariopsis lemaneiformis using enzyme assisted one-step process. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Li J, He Z, Liang Y, Peng T, Hu Z. Insights into Algal Polysaccharides: A Review of Their Structure, Depolymerases, and Metabolic Pathways. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:1749-1765. [PMID: 35124966 DOI: 10.1021/acs.jafc.1c05365] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In recent years, marine macroalgae with extensive biomass have attracted the attention of researchers worldwide. Furthermore, algal polysaccharides have been widely studied in the food, pharmaceutical, and cosmetic fields because of their various kinds of bioactivities. However, there are immense barriers to their application as a result of their high molecular size, poor solubility, hydrocolloid nature, and low physiological activities. Unique polysaccharides, such as laminarin, alginate, fucoidan, agar, carrageenan, porphyran, ulvan, and other complex structural polysaccharides, can be digested by marine bacteria with many carbohydrate-active enzymes (CAZymes) by breaking down the limitation of glycosidic bonds. However, structural elucidation of algal polysaccharides, metabolic pathways, and identification of potential polysaccharide hydrolases that participate in different metabolic pathways remain major obstacles restricting the efficient utilization of algal oligosaccharides. This review focuses on the structure, hydrolase families, metabolic pathways, and potential applications of seven macroalgae polysaccharides. These results will contribute to progressing our understanding of the structure of algal polysaccharides and their metabolic pathways and will be valuable for clearing the way for the compelling utilization of bioactive oligosaccharides.
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Affiliation(s)
- Jin Li
- Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China
| | - Zhixiao He
- Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China
| | - Yumei Liang
- Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China
| | - Tao Peng
- Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China
| | - Zhong Hu
- Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China
- Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, Guangdong 511458, People's Republic of China
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Porphyran and oligo-porphyran originating from red algae Porphyra: Preparation, biological activities, and potential applications. Food Chem 2021; 349:129209. [PMID: 33588184 DOI: 10.1016/j.foodchem.2021.129209] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/17/2021] [Accepted: 01/24/2021] [Indexed: 02/07/2023]
Abstract
Porphyra is one of the most economically important red algae in the world. The functional components extracted from Porphyra such as porphyrans, proteins, lipids, and minerals have strong physiological activities. Porphyran, a sulfated galactan, is composed of alternating 1,4-linked α-l-galactopyranose-6-sulfate (L6S) and 1,3-linked β-d-galactopyranose (G). Porphyran and oligo-porphyran have a series of pharmacological and biological functions, such as antioxidation, anticancer, antiaging, antiallergic, immunomodulatory, hypoglycaemic, and hypolipidemic effects. Thus, red algae Porphyra-derived porphyran and oligo-porphyran have various potential applications in food, medicine, and cosmetic fields. For better application, this review introduces and summarizes the structure and source of porphyran as well as the preparation methods, biological activities, and potential applications of porphyran and oligo-porphyran. Moreover, the future research directions and emphasis of porphyran and oligo-porphyran preparation as well as their functional activities and applications are highlighted and prospected.
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