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Huang D, Song Y, Liu Y, Qin Y. A new strain of Aspergillus tubingensis for high-activity pectinase production. Braz J Microbiol 2019; 50:53-65. [PMID: 30610493 DOI: 10.1007/s42770-018-0032-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 08/23/2018] [Indexed: 11/30/2022] Open
Abstract
Pectinase is a general term for a class of enzymes that decompose pectin. To obtain a fungal strain with high-activity pectinase of potential commercial importance, we screened microorganisms from the soil of vineyards, performed mutation breeding by ultraviolet (UV) and nitrosoguanidine (NTG) mutagenesis, and performed comparisons to commercially available pectinases. We found that the derived pectinase-producing strain Rn14-88A had the highest pectinase activity of 8363.215 U/mL, and identified it using internal transcribed spacer sequence analysis as Aspergillus tubingensis. Rn14-88A was the original strain for UV mutagenesis, from which mutant strain R-7-2-4 had the highest pectinase enzyme activity (9198.68 U/mL), which was a 9.99% increase compared to that of Rn14-88A. Following NTG mutagenesis of R-7-2-4, mutant strain Y1-3-2-6 had a pectinase enzyme activity of 9843.34 U/mL, which reflects a 6.36% increase compared to the pectinase activity of R-7-2-4. Subsequently, another round of NTG mutagenesis was performed on Y1-3-2-6, and the mutagenic strain Y2-6-3-4 exhibited an improved enzyme activity of 21,864.34 U/mL, which was 161.44% higher than that of Rn14-88A. Through liquid fermentation experiments of A. tubingensis Y2-6-3-4, it was determined that pectinase activity was the highest at a fermentation time of 20 h. Therefore, we conclude that A. tubingensis Y2-6-3-4 has potential for use in commercial production.
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Affiliation(s)
- Danmei Huang
- College of Enology, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Yuyang Song
- College of Enology, Northwest A&F University, Yangling, 712100, Shaanxi, China.,Shaanxi Engineering Research Center for Viti-Viniculture, Yangling, 712100, Shaanxi, China
| | - Yanlin Liu
- College of Enology, Northwest A&F University, Yangling, 712100, Shaanxi, China.,Shaanxi Engineering Research Center for Viti-Viniculture, Yangling, 712100, Shaanxi, China
| | - Yi Qin
- College of Enology, Northwest A&F University, Yangling, 712100, Shaanxi, China. .,Shaanxi Engineering Research Center for Viti-Viniculture, Yangling, 712100, Shaanxi, China.
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Zhang W, Zhao B, Du L, Shen Y. Cytotoxic Polyketides with an Oxygen-Bridged Cyclooctadiene Core Skeleton from the Mangrove Endophytic Fungus Phomosis sp. A818. Molecules 2017; 22:molecules22091547. [PMID: 28906443 PMCID: PMC6151419 DOI: 10.3390/molecules22091547] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 08/22/2017] [Accepted: 09/11/2017] [Indexed: 11/16/2022] Open
Abstract
Plant endophytic microorganisms represent a largely untapped resource for new bioactive natural products. Eight polyketide natural products were isolated from a mangrove endophytic fungus Phomosis sp. A818. The structural elucidation of these compounds revealed that they share a distinct feature in their chemical structures, an oxygen-bridged cyclooctadiene core skeleton. The study on their structure-activity relationship showed that the α,β-unsaturated δ-lactone moiety, as exemplified in compounds 1 and 2, was critical to the cytotoxic activity of these compounds. In addition, compound 4 might be a potential agonist of AMPK (5'-adenosine monophosphate-activated protein kinase).
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Affiliation(s)
- Wei Zhang
- Shandong Provincial Key Laboratory of Synthetic Biology, CAS Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Qingdao 266101, China.
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Baobing Zhao
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China.
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Yuemao Shen
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China.
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Optimization of genome shuffling for high-yield production of the antitumor deacetylmycoepoxydiene in an endophytic fungus of mangrove plants. Appl Microbiol Biotechnol 2016; 100:7491-8. [DOI: 10.1007/s00253-016-7457-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 03/01/2016] [Accepted: 03/05/2016] [Indexed: 11/26/2022]
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Li X, Zhu J, Shi G, Sun M, Guo Z, Wang H, Lu C, Shen Y. Deletion of the side chain assembly reveals diverse post-PKS modifications in the biosynthesis of ansatrienins. RSC Adv 2016. [DOI: 10.1039/c6ra19036g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Seven new ansatrienols were extracted from Streptomyces sp., and 3 showed anti-T3SS activity, demonstrating diverse post-PKS modifications during ansatrienin biosynthesis.
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Affiliation(s)
- Xiaomei Li
- Key Laboratory of Chemical Biology (Ministry of Education)
- School of Pharmaceutical Sciences
- Shandong University
- Jinan
- P. R. China
| | - Jing Zhu
- State Key Laboratory of Microbial Technology
- School of Life Sciences
- Shandong University
- Jinan
- P. R. China
| | - Guoyin Shi
- State Key Laboratory of Microbial Technology
- School of Life Sciences
- Shandong University
- Jinan
- P. R. China
| | - Mingwei Sun
- Key Laboratory of Chemical Biology (Ministry of Education)
- School of Pharmaceutical Sciences
- Shandong University
- Jinan
- P. R. China
| | - Zhixing Guo
- Key Laboratory of Chemical Biology (Ministry of Education)
- School of Pharmaceutical Sciences
- Shandong University
- Jinan
- P. R. China
| | - Haoxin Wang
- State Key Laboratory of Microbial Technology
- School of Life Sciences
- Shandong University
- Jinan
- P. R. China
| | - Chunhua Lu
- Key Laboratory of Chemical Biology (Ministry of Education)
- School of Pharmaceutical Sciences
- Shandong University
- Jinan
- P. R. China
| | - Yuemao Shen
- Key Laboratory of Chemical Biology (Ministry of Education)
- School of Pharmaceutical Sciences
- Shandong University
- Jinan
- P. R. China
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Venugopalan A, Srivastava S. Endophytes as in vitro production platforms of high value plant secondary metabolites. Biotechnol Adv 2015. [PMID: 26225453 DOI: 10.1016/j.biotechadv.2015.07.004] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Many reports have been published on bioprospecting of endophytic fungi capable of producing high value bioactive molecules like, paclitaxel, vincristine, vinblastine, camptothecin and podophyllotoxin. However, commercial exploitation of endophytes for high value-low volume plant secondary metabolites remains elusive due to widely reported genomic instability of endophytes in the axenic culture. While most of the endophyte research focuses on screening endophytes for novel or existing high value biomolecules, very few reports seek to explore the possible mechanisms of production of host-plant associated or novel secondary metabolites in these organisms. With an overview of host-endophyte relationship and its possible impact on the secondary metabolite production potential of endophytes, the review highlights the evidence reported for and against the presence of host-independent biosynthetic machinery in endophytes. The review aims to address the question, why should and how can endophytes be exploited for large scale in vitro production of high value phytochemicals? In this regard, various bioprocess optimization strategies that have been applied to sustain and enhance the product yield from the endophytes have also been described in detail. Further, techniques like mixed fermentation/co-cultivation and use of epigenetic modifiers have also been discussed as potential strategies to activate cryptic gene clusters in endophytes, thereby aiding in novel metabolite discovery and overcoming the limitations associated with axenic culture of endophytes.
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Affiliation(s)
- Aarthi Venugopalan
- Department of Biotechnology, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Smita Srivastava
- Department of Biotechnology, Indian Institute of Technology Madras, Chennai 600 036, India.
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Phomopsidone A, a novel depsidone metabolite from the mangrove endophytic fungus Phomopsis sp. A123. Fitoterapia 2014; 96:146-51. [DOI: 10.1016/j.fitote.2014.05.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 04/30/2014] [Accepted: 05/04/2014] [Indexed: 11/17/2022]
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Mahidol C, Kittakoop P, Prachyawarakorn V, Pailee P, Prawat H, Ruchirawat S. Recent investigations of bioactive natural products from endophytic, marine-derived, insect pathogenic fungi and Thai medicinal plants. PURE APPL CHEM 2014. [DOI: 10.1515/pac-2013-1206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractLiving organisms in Thailand are very diverse due to the unique geographical location of Thailand. The diversity of Thai bioresources has proven to be a rich source of biologically active compounds. The present review covers bioactive substances from Thai endophytic, marine-derived, insect pathogenic fungi and medicinal plants. Many new compounds isolated from Thai bioresources have diverse skeletons belonging to various classes of natural products. These compounds exhibited an array of biological activities, and some are of pharmaceutical interest. Bioactive compounds from Thai bioresources have not only attracted organic chemists to develop strategies for total synthesis, but also attracted (chemical) biologists to investigate the mechanisms of action. The chemistry and biology of some selected compounds are also discussed in this review.
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Affiliation(s)
- Chulabhorn Mahidol
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Prasat Kittakoop
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Vilailak Prachyawarakorn
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Phanruethai Pailee
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Hunsa Prawat
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Somsak Ruchirawat
- 1Chulabhorn Research Institute, Chulabhorn Graduate Institute, and Center of Excellence on Environmental Health and Toxicology (EHT), Kamphang Phet 6 Road, Laksi, Bangkok 10210, Thailand
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