1
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Wang J, Liao N, Liu G, Li Y, Xu F, Shi J. Diversity and regioselectivity of O-methyltransferases catalyzing the formation of O-methylated flavonoids. Crit Rev Biotechnol 2024; 44:1203-1225. [PMID: 38035668 DOI: 10.1080/07388551.2023.2280755] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 08/26/2023] [Accepted: 10/17/2023] [Indexed: 12/02/2023]
Abstract
Flavonoids and their methylated derivatives have immense market potential in the food and biomedical industries due to their multiple beneficial effects, such as antimicrobial, anti-inflammatory, and anticancer activities. The biological synthesis of flavonoids and their derivatives is often accomplished via the use of genetically modified microorganisms to ensure large-scale production. Therefore, it is pivotal to understand the properties of O-methyltransferases (OMTs) that mediate the methylation of flavonoids. However, the properties of these OMTs are governed by their: sources, substrate specificity, amino acid residues in the active sites, and the intricate mechanism. In order to obtain a clue for the selection of suitable OMTs for the biosynthesis of a target methylated flavonoid, we made a comprehensive review of the currently reported results, with a particular focus on their comparative regioselectivity for different flavonoid substrates. Additionally, the possible mechanisms for the diversity of this class of enzymes were explored using molecular simulation technology. Finally, major gaps in our understanding and areas for future studies were discussed. The findings of this study may be useful in selecting genes that encode OMTs and designing enzyme-based processes for synthesizing O-methylated flavonoids.
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Affiliation(s)
- Juan Wang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Ning Liao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Guanwen Liu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Yinghui Li
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Fengqin Xu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
| | - Junling Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, People's Republic of China
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2
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Zhao C, Wang Z, Liao Z, Liu X, Li Y, Zhou C, Sun C, Wang Y, Cao J, Sun C. Integrated Metabolomic-Transcriptomic Analyses of Flavonoid Accumulation in Citrus Fruit under Exogenous Melatonin Treatment. Int J Mol Sci 2024; 25:6632. [PMID: 38928338 PMCID: PMC11204001 DOI: 10.3390/ijms25126632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Revised: 06/03/2024] [Accepted: 06/07/2024] [Indexed: 06/28/2024] Open
Abstract
The flavonoids in citrus fruits are crucial physiological regulators and natural bioactive products of high pharmaceutical value. Melatonin is a pleiotropic hormone that can regulate plant morphogenesis and stress resistance and alter the accumulation of flavonoids in these processes. However, the direct effect of melatonin on citrus flavonoids remains unclear. In this study, nontargeted metabolomics and transcriptomics were utilized to reveal how exogenous melatonin affects flavonoid biosynthesis in "Bingtangcheng" citrus fruits. The melatonin treatment at 0.1 mmol L-1 significantly increased the contents of seven polymethoxylated flavones (PMFs) and up-regulated a series of flavonoid pathway genes, including 4CL (4-coumaroyl CoA ligase), FNS (flavone synthase), and FHs (flavonoid hydroxylases). Meanwhile, CHS (chalcone synthase) was down-regulated, causing a decrease in the content of most flavonoid glycosides. Pearson correlation analysis obtained 21 transcription factors co-expressed with differentially accumulated flavonoids, among which the AP2/EREBP members were the most numerous. Additionally, circadian rhythm and photosynthesis pathways were enriched in the DEG (differentially expressed gene) analysis, suggesting that melatonin might also mediate changes in the flavonoid biosynthesis pathway by affecting the fruit's circadian rhythm. These results provide valuable information for further exploration of the molecular mechanisms through which melatonin regulates citrus fruit metabolism.
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Affiliation(s)
- Chenning Zhao
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Zhendong Wang
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Zhenkun Liao
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Xiaojuan Liu
- State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China;
| | - Yujia Li
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Chenwen Zhou
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Cui Sun
- Hainan Institute, Zhejiang University, Sanya 572000, China;
| | - Yue Wang
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
| | - Jinping Cao
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
- Hainan Institute, Zhejiang University, Sanya 572000, China;
| | - Chongde Sun
- Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou 310058, China; (C.Z.); (Z.W.); (Z.L.); (Y.L.); (C.Z.); (Y.W.); (J.C.)
- Hainan Institute, Zhejiang University, Sanya 572000, China;
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Pu X, Zhang J, He J, Ai Z, He X, Zhou X, Tong S, Dai X, Wu Q, Hu J, He J, Wang H, Wang W, Liao J, Zhang L. Discovery of a novel flavonol O-methyltransferase possessing sequential 4'- and 7-O-methyltransferase activity from Camptotheca acuminata Decne. Int J Biol Macromol 2024; 266:131381. [PMID: 38580009 DOI: 10.1016/j.ijbiomac.2024.131381] [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: 01/25/2024] [Revised: 04/01/2024] [Accepted: 04/02/2024] [Indexed: 04/07/2024]
Abstract
The biosynthetic route for flavonol in Camptotheca acuminata has been recently elucidated from a chemical point of view. However, the genes involved in flavonol methylation remain unclear. It is a critical step for fully uncovering the flavonol metabolism in this ancient plant. In this study, the multi-omics resource of this plant was utilized to perform flavonol O-methyltransferase-oriented mining and screening. Two genes, CaFOMT1 and CaFOMT2 are identified, and their recombinant CaFOMT proteins are purified to homogeneity. CaFOMT1 exhibits strict substrate and catalytic position specificity for quercetin, and selectively methylates only the 4'-OH group. CaFOMT2 possesses sequential O-methyltransferase activity for the 4'-OH and 7-OH of quercetin. These CaFOMT genes are enriched in the leaf and root tissues. The catalytic dyad and critical substrate-binding sites of the CaFOMTs are determined by molecular docking and further verified through site-mutation experiments. PHE181 and MET185 are designated as the critical sites for flavonol substrate selectivity. Genomic environment analysis indicates that CaFOMTs evolved independently and that their ancestral genes are different from that of the known Ca10OMT. This study provides molecular insights into the substrate-binding pockets of two new CaFOMTs responsible for flavonol metabolism in C. acuminata.
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Affiliation(s)
- Xiang Pu
- College of Science, Sichuan Agricultural University, Ya'an 625104, China; Featured Medicinal Plants Sharing and Service Platform of Sichuan Province, Ya'an 625104, China.
| | - Jiahua Zhang
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Jinwei He
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Zhihui Ai
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Xiaoxue He
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Xiaojun Zhou
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Shiyuan Tong
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Xinyue Dai
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Qiqi Wu
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Jiayu Hu
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Jingshu He
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Hanguang Wang
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Wei Wang
- College of Science, Sichuan Agricultural University, Ya'an 625104, China
| | - Jinqiu Liao
- College of Life Science, Sichuan Agricultural University, Ya'an 625104, China; Featured Medicinal Plants Sharing and Service Platform of Sichuan Province, Ya'an 625104, China
| | - Li Zhang
- College of Science, Sichuan Agricultural University, Ya'an 625104, China; Featured Medicinal Plants Sharing and Service Platform of Sichuan Province, Ya'an 625104, China.
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4
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Liao Z, Liu X, Zheng J, Zhao C, Wang D, Xu Y, Sun C. A multifunctional true caffeoyl coenzyme A O-methyltransferase enzyme participates in the biosynthesis of polymethoxylated flavones in citrus. PLANT PHYSIOLOGY 2023; 192:2049-2066. [PMID: 37086474 PMCID: PMC10315319 DOI: 10.1093/plphys/kiad249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 02/14/2023] [Accepted: 03/27/2023] [Indexed: 05/03/2023]
Abstract
Polymethoxylated flavones (PMFs) have received extensive attention due to their abundant bioactivities. Citrus peels specifically accumulate abundant PMFs, and methylation modification is a key step in PMF biosynthesis; however, the function of reported O-methyltransferase (OMT) in citrus is insufficient to elucidate the complete methylation process of PMFs. In this study, we analyzed the accumulation pattern of PMFs in the flavedo of the sweet orange (Citrus sinensis) cultivar "Bingtangcheng" at different developmental stages. We found that accumulation of PMFs was completed at the early stage of fruit development (60-d after flowering). Furthermore, we characterized a true caffeoyl-CoA O-methyltransferase (named CsCCoAOMT1) from C. sinensis. Functional analysis in vitro showed that CsCCoAOMT1 preferred flavonoids to caffeoyl-CoA and esculetin. This enzyme efficiently methylated the 6-, 7- 8-, and 3'-OH of a wide array of flavonoids with vicinal hydroxyl groups with a strong preference for quercetin (flavonol) and flavones. The transient overexpression and virus-induced gene silencing experiments verified that CsCCoAOMT1 could promote the accumulation of PMFs in citrus. These results reveal the function of true CCoAOMTs and indicate that CsCCoAOMT1 is a highly efficient multifunctional O-methyltransferase involved in the biosynthesis of PMFs in citrus.
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Affiliation(s)
- Zhenkun Liao
- Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou 310000, China
| | - Xiaojuan Liu
- Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou 310000, China
| | - Juan Zheng
- Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou 310000, China
| | - Chenning Zhao
- Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou 310000, China
| | - Dengliang Wang
- Quzhou Academy of Agriculture and Forestry Science, Quzhou 324000, China
| | - Yang Xu
- Xiangshan Country Agricultural Economic Specialty Technology Extension Center, Ningbo 315799, China
| | - Chongde Sun
- Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Zhejiang University, Hangzhou 310000, China
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5
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Zhang X, Zhang H, Shen T, Pei J, Zhao L. Biotransformation to synthesize the methylated derivatives of baicalein using engineered Escherichia coli. Bioprocess Biosyst Eng 2023; 46:735-745. [PMID: 36932217 DOI: 10.1007/s00449-023-02860-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 03/04/2023] [Indexed: 03/19/2023]
Abstract
Oroxylin A and negletein are flavonoid compounds existing in plants, with excellent pharmacological activities such as anti-inflammatory, anti-viropexis, and anti-cancer. Nevertheless, the natural abundance of these compounds in plants is extremely low. Here, a biotransformation pathway was developed in engineered strains to synthesize oroxylin A and negletein from baicalin by using the crude extract of Scutellaria baicalensis as the substrate. Briefly, the precursor baicalin in this crude extract was hydrolyzed by a β-glucuronidase to form the intermediate baicalein, then O-methyltransferases utilize this intermediate to synthesize oroxylin A and negletein. Through screening strains and carbon sources, regulating intercellular S-adenosyl L-methionine synthesis, and optimizing culture conditions, the titers of the target products increased gradually, with 188.0 mg/L for oroxylin A and 222.7 mg/L for negletein finally. The study illustrates a convenient method to synthesize oroxylin A and negletein from a low-cost substrate, paving the way for the mass acquisition and further bioactivities development and utilization of these rare and high-value compounds.
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Affiliation(s)
- Xiaomeng Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China.,College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Haiyan Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China.,College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Tianyu Shen
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China.,College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Jianjun Pei
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China. .,College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China.
| | - Linguo Zhao
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China. .,College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China.
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6
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Xian L, Sahu SK, Huang L, Fan Y, Lin J, Su J, Bai M, Chen Y, Wang S, Ye P, Wang F, Luo Q, Bai H, Lin X, Yuan C, Geng X, Liu H, Wu H. The draft genome and multi-omics analyses reveal new insights into geo-herbalism properties of Citrus grandis 'Tomentosa'. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 325:111489. [PMID: 36216298 DOI: 10.1016/j.plantsci.2022.111489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/29/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Citrus grandis 'Tomentosa' (CGT) (Huajuhong, HJH) is a widely used medicinal plant, which is mainly produced in Guangdong and Guangxi provinces of South China. Particularly, HJH from Huazhou (HZ) county of Guangdong province has been well-regarded as the best national product for geo-herbalism. But the reasons for geo-herbalism property in HJH from HZ county remains a mystery. Therefore, a multi-omics approach was applied to identify the nature of the geo-herbalism in CGT from three different regions. The comprehensive screening of differential metabolites revealed that the Nobiletin content was significantly different in HZ region compared to other regions, and could be employed as a key indicator to determine the geo-herbalism. Furthermore, the high-quality genome (N50 of 9.12 Mb), coupled with genomics and transcriptomics analyses indicated that CGT and Citrus grandis are closely related, with a predicted divergence time of 19.1 million years ago (MYA), and no recent WGD occurred in the CGT, and the bioactive ingredients of CGT were more abundant than that of Citrus grandis. Interestingly, Nobiletin (Polymethoxyflavones) content was identified as a potential indicator of geo-herbalism, and O-methyltransferase (OMT) genes are involved in the synthesis of Polymethoxyflavones. Further multi-omics analysis led to the identification of a novel OMT gene (CtgOMT1) whose transient overexpression displayed significantly higher Nobiletin content, suggesting that CtgOMT1 was involved in the synthesis of Nobiletin. Overall, our findings provide new data resources for geo-herbalism evaluation, germplasm conservation and insights into Nobiletin biosynthesis pathways for the medicinal plant C. grandis 'Tomentosa'.
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Affiliation(s)
- Lin Xian
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China; State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China
| | - Sunil Kumar Sahu
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China
| | - Liying Huang
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Yannan Fan
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China
| | - Jianhao Lin
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Jianmu Su
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Mei Bai
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Yewen Chen
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shujie Wang
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China
| | - Peng Ye
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Fang Wang
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qun Luo
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Haiyi Bai
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Xiaojing Lin
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Caihong Yuan
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Xiaodie Geng
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Huan Liu
- State Key Laboratory of Agricultural Genomics, BGI-Shenzhen, Shenzhen 518083, China.
| | - Hong Wu
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China.
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7
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Dippe M, Davari MD, Weigel B, Heinke R, Vogt T, Wessjohann LA. Altering the Regiospecificity of a Catechol
O
‐methyltransferase through Rational Design: Vanilloid vs. Isovanilloid Motifs in the B‐ring of Flavonoids. ChemCatChem 2022. [DOI: 10.1002/cctc.202200511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Martin Dippe
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
| | - Mehdi D. Davari
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
| | - Benjamin Weigel
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
| | - Ramona Heinke
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
| | - Thomas Vogt
- Department of Cell and Metabolic Biology Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
| | - Ludger A. Wessjohann
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 D-06120 Halle Germany
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8
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Ou K, He X, Cai K, Zhao W, Jiang X, Ai W, Ding Y, Cao Y. Phosphate-Solubilizing Pseudomonas sp. Strain WS32 Rhizosphere Colonization-Induced Expression Changes in Wheat Roots. Front Microbiol 2022; 13:927889. [PMID: 35847091 PMCID: PMC9279123 DOI: 10.3389/fmicb.2022.927889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 06/13/2022] [Indexed: 11/13/2022] Open
Abstract
Rhizosphere colonization is a pre-requisite for the favorable application of plant growth-promoting rhizobacteria (PGPR). Exchange and mutual recognition of signaling molecules occur frequently between plants and microbes. Here, the luciferase luxAB gene was electrotransformed into the phosphate-solubilizing strain Pseudomonas sp. WS32, a type of plant growth-promoting rhizobacterium with specific affinity for wheat. A labeled WS32 strain (WS32-L) was applied to determine the temporal and spatial traits of colonization within the wheat rhizosphere using rhizoboxes experimentation under natural condition. The effects of colonization on wheat root development and seedling growth were evaluated, and RNA sequencing (RNA-seq) was performed to explore the transcriptional changes that occur in wheat roots under WS32 colonization. The results showed that WS32-L could survive in the wheat rhizosphere for long periods and could expand into new zones following wheat root extension. Significant increases in seedling fresh and dry weight, root fresh and dry weight, root surface area, number of root tips, and phosphorus accumulation in the wheat leaves occurred in response to WS32 rhizosphere colonization. RNA-seq analysis showed that a total of 1485 genes in wheat roots were differentially expressed between the inoculated conditions and the uninoculated conditions. Most of the transcriptional changes occurred for genes annotated to the following functional categories: "phosphorus and other nutrient transport," "hormone metabolism and organic acid secretion," "flavonoid signal recognition," "membrane transport," and "transcription factor regulation." These results are therefore valuable to future studies focused on the molecular mechanisms underlying the growth-promoting activities of PGPR on their host plants.
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Affiliation(s)
- Kangmiao Ou
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Xiangyi He
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Ke Cai
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Weirong Zhao
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Xiaoxun Jiang
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Wenfeng Ai
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Yue Ding
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Yuanyuan Cao
- School of Life Sciences, Anhui Agricultural University, Hefei, China
- Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, Anhui Agricultural University, Hefei, China
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9
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Tan Y, Yang J, Jiang Y, Sun S, Wei X, Wang R, Bu J, Li D, Kang L, Chen T, Guo J, Cui G, Tang J, Huang L. Identification and characterization of two Isatis indigotica O-methyltransferases methylating C-glycosylflavonoids. HORTICULTURE RESEARCH 2022; 9:uhac140. [PMID: 36072835 PMCID: PMC9437721 DOI: 10.1093/hr/uhac140] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 06/14/2022] [Indexed: 06/15/2023]
Abstract
Isatis indigotica accumulates several active substances, including C-glycosylflavonoids, which have important pharmacological activities and health benefits. However, enzymes catalyzing the methylation step of C-glycosylflavonoids in I. indigotica remain unknown. In this study, three O-methyltransferases (OMTs) were identified from I. indigotica that have the capacity for O-methylation of the C-glycosylflavonoid isoorientin. The Type II OMTs IiOMT1 and IiOMT2 efficiently catalyze isoorientin to form isoscoparin, and decorate one of the aromatic vicinal hydroxyl groups on flavones and methylate the C6, C8, and 3'-hydroxyl positions to form oroxylin A, wogonin, and chrysoeriol, respectively. However, the Type I OMT IiOMT3 exhibited broader substrate promiscuity and methylated the C7 and 3'-hydroxyl positions of flavonoids. Further site-directed mutagenesis studies demonstrated that five amino acids of IiOMT1/IiOMT2 (D121/D100, D173/D149, A174/A150R, N200/N176, and D248/D233) were critical residues for their catalytic activity. Additionally, only transient overexpression of Type II OMTs IiOMT1 and IiOMT2 in Nicotiana benthamiana significantly increased isoscoparin accumulation, indicating that the Type II OMTs IiOMT1 and IiOMT2 could catalyze the methylation step of C-glycosylflavonoid, isoorientin at the 3'-hydroxyl position. This study provides insights into the biosynthesis of methylated C-glycosylflavonoids, and IiOMTs could be promising catalysts in the synthesis of bioactive compounds.
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Affiliation(s)
- Yuping Tan
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- School of Traditional Chinese Medicine, Shenyang Pharmaceutical University, Shenyang 117004, China
| | - Jian Yang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yinyin Jiang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Shufu Sun
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Xiaoyan Wei
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, China
| | - Ruishan Wang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Junling Bu
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Dayong Li
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
| | - Liping Kang
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Tong Chen
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Juan Guo
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Guanghong Cui
- State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
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10
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Li C, Dai T, Chen J, Chen M, Liang R, Liu C, Du L, McClements DJ. Modification of flavonoids: methods and influences on biological activities. Crit Rev Food Sci Nutr 2022; 63:10637-10658. [PMID: 35687361 DOI: 10.1080/10408398.2022.2083572] [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] [Indexed: 11/03/2022]
Abstract
Flavonoids are important active ingredients in plant-based food, which have many beneficial effects on health. But the low solubility, poor oral bioavailability, and inferior stability of many flavonoids may limit their applications in the food, cosmetics, and pharmaceutical industries. Structural modification can overcome these shortcomings to improve and extend the application of flavonoids. The study of how to modify flavonoids and the influence of various modifications on biological activity have drawn great interest in the current literature. In this review, the working principles and operating conditions of modification methods were summarized along with their potential and limitations in terms of operational safety, cost, and productivity. The influence of various modifications on biological activities and the structure-activity relationships of flavonoids derivatives were discussed and highlighted, which may give guidance for the synthesis of highly effective active agents. In addition, the safety of flavonoids derivatives is reviewed, and future research directions of flavonoid modification research are discussed.
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Affiliation(s)
- Changhong Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Taotao Dai
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- Guangxi Academy of Agricultural Sciences, Agro-food Science and Technology Research Institute, Nanning, China
| | - Jun Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Mingshun Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Ruihong Liang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Chengmei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Liqing Du
- China Academy of Tropical Agricultural Sciences, South Subtropical Crop Research Institute, Zhanjiang China
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11
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Li L, Liu X, Li L, Wei S, Huang Q. Preparation of Rosin-Based Composite Membranes and Study of Their Dencichine Adsorption Properties. Polymers (Basel) 2022; 14:polym14112161. [PMID: 35683833 PMCID: PMC9183177 DOI: 10.3390/polym14112161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/09/2022] [Accepted: 05/11/2022] [Indexed: 02/04/2023] Open
Abstract
In this work, rosin-based composite membranes (RCMs) were developed as selective sorbents for the preparation of dencichine for the first time. The rosin-based polymer microspheres (RPMs) were synthesized using 4-ethylpyridine as a functional monomer and ethylene glycol maleic rosinate acrylate as a crosslinking. RCMs were prepared by spinning the RPMs onto the membranes by electrostatic spinning technology. The optimization of various parameters that affect RCMs was carried out, such as the ratio concentration and voltage intensity of electrospinning membrane. The RCMs were characterized by SEM, TGA and FT-IR. The performances of RCMs were assessed, which included adsorption isotherms, selective recognition and adsorption kinetics. The adsorption of dencichine on RCMs followed pseudo-second-order and adapted Langmuir–Freundlich isotherm model. As for the RCMs, the fast adsorption stage appeared within the first 45 min, and the experimental maximum adsorption capacity was 1.056 mg/g, which is much higher than the previous dencichine adsorbents reported in the literature. The initial decomposition temperature of RCMs is 297 °C, the tensile strength is 2.15 MPa and the elongation at break is 215.1%. The RCMs have good thermal stability and mechanical properties. These results indicated that RCMs are a tremendously promising adsorbent for enriching and purifying dencichine from the notoginseng extracts.
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Affiliation(s)
- Long Li
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China; (L.L.); (X.L.); (L.L.); (S.W.)
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Nanning 530006, China
- Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China
- Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China
| | - Xiuyu Liu
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China; (L.L.); (X.L.); (L.L.); (S.W.)
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Nanning 530006, China
- Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China
- Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China
| | - Lanfu Li
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China; (L.L.); (X.L.); (L.L.); (S.W.)
| | - Sentao Wei
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China; (L.L.); (X.L.); (L.L.); (S.W.)
| | - Qin Huang
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China; (L.L.); (X.L.); (L.L.); (S.W.)
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Nanning 530006, China
- Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China
- Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China
- Correspondence:
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Borredá C, Perez-Roman E, Talon M, Terol J. Comparative transcriptomics of wild and commercial Citrus during early ripening reveals how domestication shaped fruit gene expression. BMC PLANT BIOLOGY 2022; 22:123. [PMID: 35300613 PMCID: PMC8928680 DOI: 10.1186/s12870-022-03509-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 03/03/2022] [Indexed: 05/03/2023]
Abstract
BACKGROUND Interspecific hybridizations and admixtures were key in Citrus domestication, but very little is known about their impact at the transcriptomic level. To determine the effects of genome introgressions on gene expression, the transcriptomes of the pulp and flavedo of three pure species (citron, pure mandarin and pummelo) and four derived domesticated genetic admixtures (sour orange, sweet orange, lemon and domesticated mandarin) have been analyzed at color break. RESULTS Many genes involved in relevant physiological processes for domestication, such sugar/acid metabolism and carotenoid/flavonoid synthesis, were differentially expressed among samples. In the low-sugar, highly acidic species lemon and citron, many genes involved in sugar metabolism, the TCA cycle and GABA shunt displayed a reduced expression, while the P-type ATPase CitPH5 and most subunits of the vacuolar ATPase were overexpressed. The red-colored species and admixtures were generally characterized by the overexpression in the flavedo of specific pivotal genes involved in the carotenoid biosynthesis, including phytoene synthase, ζ-carotene desaturase, β-lycopene cyclase and CCD4b, a carotenoid cleavage dioxygenase. The expression patterns of many genes involved in flavonoid modifications, especially the flavonoid and phenylpropanoid O-methyltransferases showed extreme diversity. However, the most noticeable differential expression was shown by a chalcone synthase gene, which catalyzes a key step in the biosynthesis of flavonoids. This chalcone synthase was exclusively expressed in mandarins and their admixed species, which only expressed the mandarin allele. In addition, comparisons between wild and domesticated mandarins revealed that the major differences between their transcriptomes concentrate in the admixed regions. CONCLUSION In this work we present a first study providing broad evidence that the genome introgressions that took place during citrus domestication largely shaped gene expression in their fruits.
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Affiliation(s)
- Carles Borredá
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113, Moncada, Valencia, Spain
| | - Estela Perez-Roman
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113, Moncada, Valencia, Spain
| | - Manuel Talon
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113, Moncada, Valencia, Spain
| | - Javier Terol
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113, Moncada, Valencia, Spain.
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Diversification of Chemical Structures of Methoxylated Flavonoids and Genes Encoding Flavonoid-O-Methyltransferases. PLANTS 2022; 11:plants11040564. [PMID: 35214897 PMCID: PMC8876552 DOI: 10.3390/plants11040564] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/13/2022] [Accepted: 02/16/2022] [Indexed: 11/25/2022]
Abstract
The O-methylation of specialized metabolites in plants is a unique decoration that provides structural and functional diversity of the metabolites with changes in chemical properties and intracellular localizations. The O-methylation of flavonoids, which is a class of plant specialized metabolites, promotes their antimicrobial activities and liposolubility. Flavonoid O-methyltransferases (FOMTs), which are responsible for the O-methylation process of the flavonoid aglycone, generally accept a broad range of substrates across flavones, flavonols and lignin precursors, with different substrate preferences. Therefore, the characterization of FOMTs with the physiology roles of methoxylated flavonoids is useful for crop improvement and metabolic engineering. In this review, we summarized the chemodiversity and physiology roles of methoxylated flavonoids, which were already reported, and we performed a cross-species comparison to illustrate an overview of diversification and conserved catalytic sites of the flavonoid O-methyltransferases.
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Förster C, Gershenzon J, Köllner TG. Evolution of DIMBOA-Glc O-Methyltransferases from Flavonoid O-Methyltransferases in the Grasses. Molecules 2022; 27:molecules27031007. [PMID: 35164272 PMCID: PMC8839659 DOI: 10.3390/molecules27031007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/21/2022] [Accepted: 01/31/2022] [Indexed: 11/16/2022] Open
Abstract
O-Methylated benzoxazinoids (BXs) and flavonoids are widespread defenses against herbivores and pathogens in the grasses (Poaceae). Recently, two flavonoid O-methyltransferases (FOMTs), ZmFOMT2 and ZmFOMT3, have been reported to produce phytoalexins in maize (Zea mays). ZmFOMT2 and ZmFOMT3 are closely related to the BX O-methyltransferases (OMTs) ZmBX10-12 and ZmBX14, suggesting a common evolutionary origin in the Poaceae. Here, we studied the evolution and enzymatic requirements of flavonoid and BX O-methylation activities in more detail. Using BLAST searches and phylogenetic analyses, we identified enzymes homologous to ZmFOMT2 and ZmFOMT3, ZmBX10-12, and ZmBX14 in several grasses, with the most closely related candidates found almost exclusively in species of the Panicoideae subfamily. Biochemical characterization of candidate enzymes from sorghum (Sorghum bicolor), sugar cane (Saccharum spp.), and teosinte (Zea nicaraguensis) revealed either flavonoid 5-O-methylation activity or DIMBOA-Glc 4-O-methylation activity. However, DIMBOA-Glc 4-OMTs from maize and teosinte also accepted flavonols as substrates and converted them to 3-O-methylated derivatives, suggesting an evolutionary relationship between these two activities. Homology modeling, sequence comparisons, and site-directed mutagenesis led to the identification of active site residues crucial for FOMT and BX OMT activity. However, the full conversion of ZmFOMT2 activity into BX OMT activity by switching these residues was not successful. Only trace O-methylation of BXs was observed, indicating that amino acids outside the active site cavity are also involved in determining the different substrate specificities. Altogether, the results of our study suggest that BX OMTs have evolved from the ubiquitous FOMTs in the PACMAD clade of the grasses through a complex series of amino acid changes.
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Förster C, Handrick V, Ding Y, Nakamura Y, Paetz C, Schneider B, Castro-Falcón G, Hughes CC, Luck K, Poosapati S, Kunert G, Huffaker A, Gershenzon J, Schmelz EA, Köllner TG. Biosynthesis and antifungal activity of fungus-induced O-methylated flavonoids in maize. PLANT PHYSIOLOGY 2022; 188:167-190. [PMID: 34718797 PMCID: PMC8774720 DOI: 10.1093/plphys/kiab496] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/30/2021] [Indexed: 05/05/2023]
Abstract
Fungal infection of grasses, including rice (Oryza sativa), sorghum (Sorghum bicolor), and barley (Hordeum vulgare), induces the formation and accumulation of flavonoid phytoalexins. In maize (Zea mays), however, investigators have emphasized benzoxazinoid and terpenoid phytoalexins, and comparatively little is known about flavonoid induction in response to pathogens. Here, we examined fungus-elicited flavonoid metabolism in maize and identified key biosynthetic enzymes involved in the formation of O-methylflavonoids. The predominant end products were identified as two tautomers of a 2-hydroxynaringenin-derived compound termed xilonenin, which significantly inhibited the growth of two maize pathogens, Fusarium graminearum and Fusarium verticillioides. Among the biosynthetic enzymes identified were two O-methyltransferases (OMTs), flavonoid OMT 2 (FOMT2), and FOMT4, which demonstrated distinct regiospecificity on a broad spectrum of flavonoid classes. In addition, a cytochrome P450 monooxygenase (CYP) in the CYP93G subfamily was found to serve as a flavanone 2-hydroxylase providing the substrate for FOMT2-catalyzed formation of xilonenin. In summary, maize produces a diverse blend of O-methylflavonoids with antifungal activity upon attack by a broad range of fungi.
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Affiliation(s)
- Christiane Förster
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Vinzenz Handrick
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Yezhang Ding
- Section of Cell and Developmental Biology, University of California, San Diego, California 92093-0380, USA
| | - Yoko Nakamura
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Christian Paetz
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Bernd Schneider
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Gabriel Castro-Falcón
- Scripps Institution of Oceanography, University of California, San Diego, California 92093, USA
| | - Chambers C Hughes
- Scripps Institution of Oceanography, University of California, San Diego, California 92093, USA
| | - Katrin Luck
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Sowmya Poosapati
- Section of Cell and Developmental Biology, University of California, San Diego, California 92093-0380, USA
| | - Grit Kunert
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Alisa Huffaker
- Section of Cell and Developmental Biology, University of California, San Diego, California 92093-0380, USA
| | - Jonathan Gershenzon
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
| | - Eric A Schmelz
- Section of Cell and Developmental Biology, University of California, San Diego, California 92093-0380, USA
| | - Tobias G Köllner
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany
- Author for communication:
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16
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Ma G, Zhang L, Seoka M, Nakata A, Yahata M, Shimada T, Fujii H, Endo T, Yoshioka T, Kan T, Kato M. Characterization of a Caffeic Acid 8- O-Methyltransferase from Citrus and Its Function in Nobiletin Biosynthesis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:543-553. [PMID: 34964635 DOI: 10.1021/acs.jafc.1c06513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nobiletin (3',4',5,6,7,8-hexamethoxyflavone) is a polymethoxylated flavonoid specifically accumulated in citrus fruit with numerous beneficial effects to human health. In this study, a novel O-methyltransferase (CitOMT2) was isolated from three citrus varieties, Ponkan mandarin (Citrus reticulata Blanco), Nou 6 ("King mandarin" × "Mukaku-kishu"), and Satsuma mandarin (Citrus unshiu Marc.), and its functions were characterized in vitro. The gene expression results showed that CitOMT2 was highly expressed in the two nobiletin abundant varieties of Ponkan mandarin and Nou 6. However, the expression level of CitOMT2 was low in the flavedo of Satsuma mandarin, in which only a small amount of nobiletin was accumulated. Functional analysis suggested that CitOMT2 was a caffeic acid 8-O-methyltransferase, and it catalyzed the O-methylation of 7,8-dihydroxyflavone at 8-OH. As the methylation of flavone at 8-OH was required for nobiletin biosynthesis, the results presented in this study suggested that CitOMT2 was a key gene regulating nobiletin accumulation in citrus fruit.
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Affiliation(s)
- Gang Ma
- Department of Bioresource Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
- Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
| | - Lancui Zhang
- Department of Bioresource Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
| | - Mao Seoka
- Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
| | - Akari Nakata
- Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
| | - Masaki Yahata
- Department of Bioresource Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
- Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
| | - Takehiko Shimada
- NARO Institute of Fruit Tree and Tea Science, Shizuoka 424-0292, Japan
| | - Hiroshi Fujii
- NARO Institute of Fruit Tree and Tea Science, Shizuoka 424-0292, Japan
| | - Tomoko Endo
- NARO Institute of Fruit Tree and Tea Science, Shizuoka 424-0292, Japan
| | - Terutaka Yoshioka
- NARO Institute of Fruit Tree and Tea Science, Shizuoka 424-0292, Japan
| | - Toshiyuki Kan
- School of Pharmaceutical Sciences University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Masaya Kato
- Department of Bioresource Sciences, Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
- Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga, Shizuoka, 422-8529, Japan
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Xu RX, Ni R, Gao S, Fu J, Xiong RL, Zhu TT, Lou HX, Cheng AX. Molecular cloning and characterization of two distinct caffeoyl CoA O-methyltransferases (CCoAOMTs) from the liverwort Marchantia paleacea. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 314:111102. [PMID: 34895539 DOI: 10.1016/j.plantsci.2021.111102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 06/14/2023]
Abstract
Caffeoyl CoA O-methyltransferases (CCoAOMTs) catalyze the transfer of a methyl group from S-adenosylmethionine to a hydroxyl moiety of caffeoyl-CoA as part of the lignin biosynthetic pathway. CCoAOMT-like proteins also catalyze to a variety of flavonoids, coumarins, and phenylpropanoids. Several CCoAOMTs that prefer flavonoids as substrates have been characterized from liverworts. Here, we cloned two CCoAOMT genes, MpalOMT2 and MpalOMT3, from the liverwort Marchantia paleacea. MpalOMT3 has a second ATG codon downstream and the truncated version that lacks 11 amino acids was named MpalOMT3-Tr. Phylogenetic analysis placed MpalOMT3 at the root of the clade with true CCoAOMTs from vascular plants and placed MpalOMT2 between the CCoAOMT and CCoAOMT-like proteins. Recombinant OMTs methylated caffeoyl CoA, phenylpropanoids, and flavonoids containing two or three vicinal hydroxyl groups. MpalOMT3 showed higher catalytic activity for phenylpropanoids than MpalOMT2, but MpalOMT2 showed more promiscuous towards eriodictyol and myricetin. The lignin content in Arabidopsis thaliana stems increased with constitutive heterologous expression of MpalOMT3-Tr, but not MpalOMT2. Subcellular localization experiments indicated that the N-terminus of MpalOMT3 probably served as a chloroplast transit peptide and inhibited its enzymatic activity. Combining the phylogenetic analysis and functional characterization, we conclude that the liverwort M. paleacea harbors true CCoAOMT and CCoAOMT-like genes.
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Affiliation(s)
- Rui-Xue Xu
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China
| | - Rong Ni
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China
| | - Shuai Gao
- Department of Pharmacy, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China
| | - Jie Fu
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China
| | - Rui-Lin Xiong
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China
| | - Ting-Ting Zhu
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China
| | - Hong-Xiang Lou
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China.
| | - Ai-Xia Cheng
- Key Laboratory of Chemical Biology of Natural Products, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, Shandong, China.
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18
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Chen Y, Liang J, Liang X, Chen J, Wang Y, Cao J, Sun C, Ye J, Chen Q. Limonin induces apoptosis of HL-60 cells by inhibiting NQO1 activity. Food Sci Nutr 2021; 9:1860-1869. [PMID: 33841805 PMCID: PMC8020947 DOI: 10.1002/fsn3.2109] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 12/19/2020] [Accepted: 12/23/2020] [Indexed: 11/10/2022] Open
Abstract
Limonin is an important bioactive substance in citrus fruits, especially in seeds, which has great potential in cancer prevention and treatment. In order to explore the anticancer activity based on interaction between limonin and NQO1, Human promyelocytic leukemia cells (HL-60) were studied in vitro. We found that limonin could inhibit proliferation and promote apoptosis of HL-60 cells, and the effect was positively correlated with its dosage. Western blot results showed that limonin could activate the endogenous apoptosis pathway mediated by mitochondria via up-regulating pro-apoptotic proteins (Bax, cytochrome c, Caspase3, and Caspase9) and down-regulating anti-apoptotic proteins (Bcl-2), thus inhibiting the proliferation of HL-60 cells and promoting apoptosis, which further proved the anticancer activity of limonin from the molecular mechanism. At the same time, limonin down-regulated the expression of NQO1, indicating that limonin may indirectly act on the apoptosis pathway by regulating the expression activity of antioxidant enzymes in vivo, thus exerting its inhibitory effect on tumor cells, which provides an idea for the molecular mechanism that natural products can indirectly exert their anticancer effect by regulating the activity of antioxidant enzymes.
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Affiliation(s)
- Yunyi Chen
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Jiaojiao Liang
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Xiao Liang
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Jiebiao Chen
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Yue Wang
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Jinping Cao
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Chongde Sun
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality ImprovementZhejiang UniversityHangzhouChina
| | - Jiaming Ye
- Zanyu TechnologyQingshan Lake Science and Technology CityHangzhouChina
| | - Qingjun Chen
- Zanyu TechnologyQingshan Lake Science and Technology CityHangzhouChina
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Comparative profiling and natural variation of polymethoxylated flavones in various citrus germplasms. Food Chem 2021; 354:129499. [PMID: 33752115 DOI: 10.1016/j.foodchem.2021.129499] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 11/22/2022]
Abstract
Citrus fruits are the main dietary source of polymethoxylated flavones (PMFs) with significant effects on consumer health. In this study, eleven main PMFs were evaluated in the fruit flavedo or leaves of 116 citrus accessions via UPLC-DAD-ESI-QTOF-MS/MS combined with HPLC-DAD analysis, which revealed significant species-specific and spatiotemporal characteristics. All Citrus reticulata and their natural or artificial hybrids were found to have detectable PMFs, especially in the fruit flavedo of the wild or early-cultivated mandarins at early fruit development stages. However, PMFs were not detected in citrons, pummelos, kumquats, trifoliata oranges, papedas, Chinese box oranges and 'Mangshanyegan'. The results enlightened that PMF accumulation only in mandarins and mandarin hybrids is a phenotype inherited from mandarin ancestors. This study provides a comprehensive PMF profile in various citrus germplasms and will benefit future functional citrus breeding practices aimed at designing plants rich in total or specific PMFs for health benefits.
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Wang Y, Liu XJ, Chen JB, Cao JP, Li X, Sun CD. Citrus flavonoids and their antioxidant evaluation. Crit Rev Food Sci Nutr 2021; 62:3833-3854. [PMID: 33435726 DOI: 10.1080/10408398.2020.1870035] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The antioxidant ability is the link and bridge connecting a variety of biological activities. Citrus flavonoids play an essential role in regulating oxidative stress and are an important source of daily intake of antioxidant supplements. Many studies have shown that citrus flavonoids promote health through antioxidation. In this review, the biosynthesis, composition and distribution of citrus flavonoids were concluded. The detection methods of antioxidant capacity of citrus flavonoids were divided into four categories: chemical, cellular, animal and clinical antioxidant capacity evaluation systems. The modeling methods, applicable scenarios, and their relative merits were compared based on these four systems. The antioxidant functions of citrus flavonoids under different evaluation systems were also discussed, especially the regulation of the Nrf2-antioxidases pathway. Some shortcomings in the current research were pointed out, and some suggestions for progress were put forward.
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Affiliation(s)
- Yue Wang
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
| | - Xiao-Juan Liu
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
| | - Jie-Biao Chen
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
| | - Jin-Ping Cao
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
| | - Xian Li
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
| | - Chong-De Sun
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Hangzhou, China
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21
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Sartor P, Bock J, Hennecke U, Thierbach S, Fetzner S. Modification of the Pseudomonas aeruginosa toxin 2-heptyl-1-hydroxyquinolin-4(1H)-one and other secondary metabolites by methyltransferases from mycobacteria. FEBS J 2020; 288:2360-2376. [PMID: 33064871 DOI: 10.1111/febs.15595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/22/2020] [Accepted: 10/12/2020] [Indexed: 11/26/2022]
Abstract
The opportunistic pathogen Pseudomonas aeruginosa, one of the most prevalent species in infections of the cystic fibrosis lung, produces a range of secondary metabolites, among them the respiratory toxin 2-heptyl-1-hydroxyquinolin-4(1H)-one (2-heptyl-4-hydroxyquinoline N-oxide, HQNO). Cultures of the emerging cystic fibrosis pathogen Mycobacteroides abscessus detoxify HQNO by methylating the N-hydroxy moiety. In this study, the class I methyltransferase MAB_2834c and its orthologue from Mycobacterium tuberculosis, Rv0560c, were identified as HQNO O-methyltransferases. The P. aeruginosa exoproducts 4-hydroxyquinolin-2(1H)-one (DHQ), 2-heptylquinolin-4(1H)-one (HHQ), and 2-heptyl-3-hydroxyquinolin-4(1H)-one (the 'Pseudomonas quinolone signal', PQS), some structurally related (iso)quinolones, and the flavonol quercetin were also methylated; however, HQNO was by far the preferred substrate. Both enzymes converted a benzimidazole[1,2-a]pyridine-4-carbonitrile-based compound, representing the scaffold of antimycobacterial substances, to an N-methylated derivative. We suggest that these promiscuous methyltransferases, newly termed as heterocyclic toxin methyltransferases (Htm), are involved in cellular response to chemical stress and possibly contribute to resistance of mycobacteria toward antimicrobial natural compounds as well as drugs. Thus, synthetic antimycobacterial agents may be designed to be unamenable to methyl transfer. ENZYMES: S-adenosyl-l-methionine:2-heptyl-1-hydroxyquinolin-4(1H)-one O-methyl-transferase, EC 2.1.1.
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Affiliation(s)
- Pascal Sartor
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
| | - Jonathan Bock
- Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussels, Belgium
| | - Ulrich Hennecke
- Organic Chemistry Research Group, Department of Chemistry and Department of Bioengineering Sciences, Vrije Universiteit Brussels, Belgium
| | - Sven Thierbach
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
| | - Susanne Fetzner
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Germany
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