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Xiao D, Wang Y, Gao C, Zhang X, Feng W, Lu X, Feng B. A New Quinazolinone Alkaloid along with Known Compounds with Seed-Germination-Promoting Activity from Rhodiola tibetica Endophytic Fungus Penicillium sp. HJT-A-6. Molecules 2024; 29:2112. [PMID: 38731603 PMCID: PMC11085523 DOI: 10.3390/molecules29092112] [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: 04/12/2024] [Revised: 04/28/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024] Open
Abstract
A new quinazolinone alkaloid named peniquinazolinone A (1), as well as eleven known compounds, 2-(2-hydroxy-3-phenylpropionamido)-N-methylbenzamide (2), viridicatin (3), viridicatol (4), (±)-cyclopeptin (5a/5b), dehydrocyclopeptin (6), cyclopenin (7), cyclopenol (8), methyl-indole-3-carboxylate (9), 2,5-dihydroxyphenyl acetate (10), methyl m-hydroxyphenylacetate (11), and conidiogenone B (12), were isolated from the endophytic Penicillium sp. HJT-A-6. The chemical structures of all the compounds were elucidated by comprehensive spectroscopic analysis, including 1D and 2D NMR and HRESIMS. The absolute configuration at C-13 of peniquinazolinone A (1) was established by applying the modified Mosher's method. Compounds 2, 3, and 7 exhibited an optimal promoting effect on the seed germination of Rhodiola tibetica at a concentration of 0.01 mg/mL, while the optimal concentration for compounds 4 and 9 to promote Rhodiola tibetica seed germination was 0.001 mg/mL. Compound 12 showed optimal seed-germination-promoting activity at a concentration of 0.1 mg/mL. Compared with the positive drug 6-benzyladenine (6-BA), compounds 2, 3, 4, 7, 9, and 12 could extend the seed germination period of Rhodiola tibetica up to the 11th day.
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Affiliation(s)
| | | | | | | | | | - Xuan Lu
- College of Life and Health, Dalian University, Dalian 116622, China; (D.X.); (Y.W.); (C.G.); (X.Z.); (W.F.)
| | - Baomin Feng
- College of Life and Health, Dalian University, Dalian 116622, China; (D.X.); (Y.W.); (C.G.); (X.Z.); (W.F.)
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Zhao S, Jing Z. New pimarane diterpenoids with antibacterial activity from fungus Arthrinium sp. ZS03. Chin J Nat Med 2024; 22:356-364. [PMID: 38658098 DOI: 10.1016/s1875-5364(24)60629-1] [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: 07/29/2023] [Indexed: 04/26/2024]
Abstract
A comprehensive chemical study of the endophytic fungus Arthrinium sp. ZS03, associated with Acorus tatarinowii Schott, yielded eleven pimarane diterpenoids (compounds 1-11), including seven novel compounds designated arthrinoids A-G (1-7). The determination of their structures and absolute configurations was achieved through extensive spectroscopic techniques, quantum chemical calculations of electronic circular dichroism (ECD), and single-crystal X-ray diffraction analysis. Furthermore, 7 demonstrated inhibitory activity against Klebsiella pneumoniae, comparable to the reference antibiotic amikacin, with a minimum inhibitory concentration (MIC) of 8 μg·mL-1.
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Affiliation(s)
- Songfeng Zhao
- Department of Pharmacy, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Ziwei Jing
- Department of Pharmacy, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
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Sundar RDV, Arunachalam S. Xenomyrothecium tongaense PTS8: a rare endophyte of Polianthes tuberosa with salient antagonism against multidrug-resistant pathogens. Front Microbiol 2024; 15:1327190. [PMID: 38435697 PMCID: PMC10906109 DOI: 10.3389/fmicb.2024.1327190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/02/2024] [Indexed: 03/05/2024] Open
Abstract
Introduction Endophytes refer to microorganisms residing within the endosphere of plants, particularly perennials, without inflicting noticeable injury or inducing obvious morphological variations to their host plant or host organism. Endophytic fungi, although often overlooked microorganisms, have garnered interest due to their significant biological diversity and ability to produce novel pharmacological substances. Methods In this study, fourteen endophytic fungi retrieved were from the stem of the perennial plant Polianthes tuberosa of the Asparagaceae family. These fungal crude metabolites were tested for antagonistic susceptibility to Multi-Drug Resistant (MDR) pathogens using agar well diffusion, Minimum Inhibitory Concentration (MIC), and Minimum Bactericidal Concentration (MBC) assays. The chequerboard test was used to assess the synergistic impact of active extract. Results and discussion In early antibacterial screening using the Agar plug diffusion test, three of fourteen endophytes demonstrated antagonism against Methicillin-resistant Staphylococcus aureus (MRSA) and Vancomycin-resistant Enterococcus (VRE). Three isolates were grown in liquid medium and their secondary metabolites were recovered using various organic solvents. Eight extracts from three endophytic fungi displayed antagonism against one or more human pathogens with diameters ranging from 11 to 24 mm. The highest antagonistic effect was obtained in ethyl acetate extract for PTS8 isolate against two MRSA (ATCC 43300, 700699) with 20 ± 0.27 and 22 ± 0.47 mm zones of inhibition, respectively, among different solvent extracts. The extract had MICs of 3.12 ± 0.05 and 1.56 ± 0.05 μg/mL, and MBCs of 50 ± 0.01 and 12.5 ± 0.04 μg/mL, respectively. Antagonism against VRE was 18 ± 0.23 mm Zone of Inhibition (ZOI) with MIC and MBC of 6.25 ± 0.25 and 25 ± 0.01 μg/mL. When ethyl acetate extract was coupled with antibiotics, the chequerboard assay demonstrated a synergistic impact against MDR bacteria. In an antioxidant test, it had an inhibitory impact of 87 ± 0.5% and 88.5 ± 0.5% in 2,2-Diphenyl-1-Picrylhydrazyl and reducing power assay, respectively, at 150 μg/mL concentration. PTS8 was identified as a Xenomyrothecium tongaense strain by 18S rRNA internal transcribed spacer (ITS) sequencing. To our insight, it is the foremost study to demonstrate the presence of an X. tongaense endophyte in the stem of P. tuberosa and the first report to study the antibacterial efficacy of X. tongaense which might serve as a powerful antibacterial source against antibiotic-resistant human infections.
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Affiliation(s)
- Ranjitha Dhevi V. Sundar
- Laboratory of Microbiology, Department of Biotechnology, School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
- Laboratory of Microbiology, Department of Agriculture Microbiology, VIT School of Agricultural Innovations and Advanced Learning, Vellore Institute of Technology, Vellore, India
| | - Sathiavelu Arunachalam
- Laboratory of Microbiology, Department of Agriculture Microbiology, VIT School of Agricultural Innovations and Advanced Learning, Vellore Institute of Technology, Vellore, India
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Purbaya S, Harneti D, Safriansyah W, Rahmawati, Wulandari AP, Mulyani Y, Supratman U. Secondary Metabolites of Biscogniauxia: Distribution, Chemical Diversity, Bioactivity, and Implications of the Occurrence. Toxins (Basel) 2023; 15:686. [PMID: 38133190 PMCID: PMC10747060 DOI: 10.3390/toxins15120686] [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: 09/30/2023] [Revised: 10/19/2023] [Accepted: 10/19/2023] [Indexed: 12/23/2023] Open
Abstract
The genus Biscogniauxia, a member of the family Xylariaceae, is distributed worldwide with more than 50 recognized taxa. Biscogniauxia species is known as a plant pathogen, typically acting as a parasite on tree bark, although certain members of this genus also function as endophytic microorganisms. Biscogniauxia endophytic strain has received attention in many cases, which includes constituent research leading to the discovery of various bioactive secondary metabolites. Currently, there are a total of 115 chemical compounds belonging to the class of secondary metabolites, and among these compounds, fatty acids have been identified. In addition, the strong pharmacological agents of this genus are (3aS,4aR,8aS,9aR)-3a-hydroxy-8a-methyl-3,5-dimethylenedecahydronaphto [2,3-b]furan-2(3H)-one (HDFO) (antifungal), biscopyran (phytotoxic activity), reticulol (antioxidant), biscogniazaphilone A and B (antimycobacterial), and biscogniauxone (Enzyme GSK3 inhibitor). This comprehensive research contributes significantly to the potential discovery of novel drugs produced by Biscogniauxia and holds promise for future development. Importantly, it represents the first-ever review of natural products originating from the Biscogniauxia genus.
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Affiliation(s)
- Sari Purbaya
- Department of Chemistry, Faculty of Science and Informatics, Universitas Jenderal Achmad Yani, Cimahi 40531, Indonesia;
- Departments of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia; (D.H.); (W.S.); (Y.M.)
| | - Desi Harneti
- Departments of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia; (D.H.); (W.S.); (Y.M.)
| | - Wahyu Safriansyah
- Departments of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia; (D.H.); (W.S.); (Y.M.)
| | - Rahmawati
- Central Laboratory, Universitas Padjadjaran, Jatinangor 45363, Indonesia;
| | - Asri Peni Wulandari
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia;
| | - Yeni Mulyani
- Departments of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia; (D.H.); (W.S.); (Y.M.)
| | - Unang Supratman
- Departments of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia; (D.H.); (W.S.); (Y.M.)
- Central Laboratory, Universitas Padjadjaran, Jatinangor 45363, Indonesia;
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Li F, Gu S, Zhang S, Mo S, Guo J, Hu Z, Zhang Y. Three new amide derivatives from the fungus Alternaria brassicicola. NATURAL PRODUCTS AND BIOPROSPECTING 2023; 13:28. [PMID: 37695377 PMCID: PMC10495297 DOI: 10.1007/s13659-023-00391-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 08/18/2023] [Indexed: 09/12/2023]
Abstract
Three new amide derivatives (alteralkaloids A-C, 1-3) and three known alkaloids (4-6) were afforded after phytochemical investigation of fungus Alternaria brassicicola. The structures of these compounds were confirmed by NMR spectroscopic and HRESIMS data. Furthermore, the absolute configuration of 1 was determined using the single-crystal X-ray diffraction analysis. Compounds 1-3 belong to a class of amide derivatives that have not been found in nature before, sharing the same characteristic signals of the butyl moiety and amide group. These isolated compounds mentioned above were tested for the cytotoxic activity.
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Affiliation(s)
- Fengli Li
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Saisai Gu
- Department of Pharmacy, Union Hospital, Tongji Medical college, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Sitian Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Shuyuan Mo
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Jieru Guo
- Department of Pharmacy, Tongji Hospital, Tongji Medical college, Huazhong University of Science and Technology, Wuhan, 430033, China.
| | - Zhengxi Hu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Yonghui Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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Han L, Zheng W, Qian SY, Yang MF, Lu YZ, He ZJ, Kang JC. New Guaiane-Type Sesquiterpenoids Biscogniauxiaols A-G with Anti-Fungal and Anti-Inflammatory Activities from the Endophytic Fungus Biscogniauxia Petrensis. J Fungi (Basel) 2023; 9:393. [PMID: 37108848 PMCID: PMC10144765 DOI: 10.3390/jof9040393] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 03/12/2023] [Accepted: 03/14/2023] [Indexed: 04/29/2023] Open
Abstract
Seven undescribed guaiane-type sesquiterpenoids named biscogniauxiaols A-G (1-7) were isolated from the endophytic fungus Biscogniauxia petrensis on Dendrobium orchids. Their structures were determined by extensive spectroscopic analyses, electronic circular dichroism (EC) and specific rotation (SR) calculations. Compound 1 represented a new family of guaiane-type sesquiterpenoids featuring an unprecedented [5/6/6/7] tetracyclic system. A plausible biosynthetic pathway for compounds 1-7 was proposed. The anti-fungal, anti-inflammatory and multidrug resistance reversal activities of the isolates were evaluated. Compounds 1, 2 and 7 exhibited potent inhibitory activities against Candida albicans with MIC values ranging from 1.60 to 6.30 μM, and suppressed nitric oxide (NO) production with IC50 ranging from 4.60 to 20.00 μM. Additionally, all compounds (100 μg/mL) enhanced the cytotoxicity of cisplatin in cisplatin-resistant non-small cell lung cancer cells (A549/DDP). This study opened up a new source for obtaining bioactive guaiane-type sesquiterpenoids and compounds 1, 2, and 7 were promising for further optimization as multifunctional inhibitors for anti-fungal (C. albicans) and anti-inflammatory purposes.
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Affiliation(s)
- Long Han
- College of Life Sciences, Guizhou University, Guiyang 550025, China
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| | - Wen Zheng
- College of Life Sciences, Guizhou University, Guiyang 550025, China
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| | - Sheng-Yan Qian
- College of Life Sciences, Guizhou University, Guiyang 550025, China
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| | - Ming-Fei Yang
- College of Life Sciences, Guizhou University, Guiyang 550025, China
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| | - Yong-Zhong Lu
- Guizhou Institute of Technology, School of Food and Pharmaceutical Engineering, Guiyang 550003, China
| | - Zhang-Jiang He
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| | - Ji-Chuan Kang
- College of Life Sciences, Guizhou University, Guiyang 550025, China
- Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
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Maksimova LA, Shafikova TN. Endogenous phthalates as a prospective regulator of interspecific relations in a biocoenosis. PROCEEDINGS OF UNIVERSITIES. APPLIED CHEMISTRY AND BIOTECHNOLOGY 2022. [DOI: 10.21285/2227-2925-2022-12-3-424-437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
It is widely believed that phthalates are xenobiotic pollutants whose prevalence in the environment is associated with their facilitated diffusion from plastic materials. Studies into the effect of synthetic phthalates on living organisms revealed their extremely negative action on the metabolism of animals and humans. The acting mechanism of these compounds is realised through a ligand-receptor pathway. Along with dioxins, polychlorinated biphenyls and similar compounds, phthalates are classified as endocrine disrupters. However, at present, sufficient evidence has been accumulated confirming the natural origin of phthalates. Thus, phthalates were de novo biosynthesised from labelled precursors in an algae culture. These compounds were detected in closed experimental systems, including cell cultures of highest plants, as well as those isolated from a number of bacterial, fungi, lowest and highest plant forms located far from the sources of technogenic pollution. The concept of phthalate biogenesis assumes the action of these compounds on living systems. Phthalates exhibit bactericidal and fungicidal action and compose allelopathic exudates, suppressing the growth of competing plant forms. Phthalates possess insecticidal and repellent properties. An analogy can be traced between the action of phthalates and endocrine disrupters of another chemical category, namely phytoestrogens, which regulate herbivorous mammal populations. A hypothesis is proposed about the biological role of endogenous plant phthalates representing secondary metabolic compounds. Exhibiting predominantly a shielding function, these compounds participate in the network of interactions between plants, animals, fungi and microorganisms. It should be noted that synthetic and endogenous phthalates are characterised by essential stereochemical differences, which can explain their different action on living organisms.
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Affiliation(s)
- L. A. Maksimova
- Siberian Institute of Plant Physiology and Biochemistry SB RAS
| | - T. N. Shafikova
- Siberian Institute of Plant Physiology and Biochemistry SB RAS
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Yan BC, Wang WG, Kong LM, Tang JW, Du X, Li Y, Puno PT. Cytochalasans from the Endophytic Fungus Phomopsis sp. shj2 and Their Antimigratory Activities. J Fungi (Basel) 2022; 8:jof8050543. [PMID: 35628798 PMCID: PMC9143583 DOI: 10.3390/jof8050543] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 02/04/2023] Open
Abstract
Cytochalasans from the endophytic fungi featured structure diversity. Our previous study has disclosed that cytochalasans from the endophytic fungus Phomopsis sp. shj2 exhibited an antimigratory effect. Further chemical investigation on Phomopsis sp. shj2 has led to the discovery of seven new cytochalasans (1–7), together with four known ones. Their structures were elucidated through extensive spectroscopic data interpretation and single-crystal X-ray diffraction analysis. Compounds 1–3 and 8–11 exhibited antimigratory effects against MDA-MB-231 in vitro with IC50 values in the range of 1.01−10.42 μM.
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Affiliation(s)
- Bing-Chao Yan
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei-Guang Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
| | - Ling-Mei Kong
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
| | - Jian-Wei Tang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xue Du
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
| | - Pema-Tenzin Puno
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; (B.-C.Y.); (W.-G.W.); (L.-M.K.); (J.-W.T.); (X.D.); (Y.L.)
- Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Correspondence:
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Mpenda F, Mkangara M. Antimicrobial activity of n-hexane and ethyl acetate extracts from Candida tropicalis and Phyllosticta capitalensis fungal endophytes. BAGHDAD JOURNAL OF BIOCHEMISTRY AND APPLIED BIOLOGICAL SCIENCES 2022. [DOI: 10.47419/bjbabs.v3i02.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background ad objective: Among the notable achievements of the twentieth century was the discovery and identification of new drugs from plants against microbial infections. However, the discovery of novel drugs since then is inadequate due to emergence of resistant microbes. In an effort to discover novel drugs, the study aimed to investigate the antimicrobial activity of crude extracts from endophytic fungi isolated from Cnidoscolas aconitifolius and Ocimum suave.
Methods: Following morphological characterization and initial screening for antimicrobial activity, isolates that had higher inhibition were genotypes by Sanger sequencing. Two isolates (Candida tropicalis from O. suave and Phyllosticta capitalensis from C. aconitifolius) were tested for antimicrobial activity against Escherichia coli and Staphylococcus aureus.
Results: Overall, the range of crude extract concentration was from 152 mg/mL to 1353 mg/mL, and that of a zone of inhibition was from 7 to 21 mm. The lowest minimum inhibition concentration (19>MIC>9.5) was observed in Phyllosticta spp. extract against S. aureus.
Conclusions: Findings of the present study have shown that endophytes isolated from medicinal plants can generate secondary metabolites with therapeutic applications. Therefore, further investigations are warranted to decipher the content and structure of bioactive compounds that may be associated with the antimicrobial activity of crude extracts.
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Wang LY, Li WY, Zhou HF, Zhao XY, Li XN, Wu XD, Zhao QS. Spiroligustolides A and B: two pairs of enantiomeric spiro-orthoester-containing phthalide dimers as Cav3.1 calcium channel inhibitors from Ligusticum Chuanxiong Hort. Bioorg Chem 2022; 123:105749. [DOI: 10.1016/j.bioorg.2022.105749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 02/21/2022] [Accepted: 03/17/2022] [Indexed: 12/27/2022]
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Ye K, Lv X, Zhang X, Wei PP, Li ZH, Ai HL, Zhao DK, Liu JK. Immunosuppressive Isopimarane Diterpenes From Cultures of the Endophytic Fungus Ilyonectria robusta. Front Pharmacol 2022; 12:766441. [PMID: 35111048 PMCID: PMC8802225 DOI: 10.3389/fphar.2021.766441] [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: 08/29/2021] [Accepted: 12/09/2021] [Indexed: 01/08/2023] Open
Abstract
Five new isopimarane diterpenes, robustaditerpene A-E (1–5), which include 19-nor-isopimarane skeleton and isopimarane skeleton, were isolated from the liquid fermentation of the endophytic fungus Ilyonectria robusta collected from Bletilla striata. The structure elucidation and relative configuration assignments of all compounds were accomplished by interpretation of NMR and HRESIMS spectrometric analyses and 13C NMR calculation. And the absolute configuration of 1-5 were identified by single-crystal X-ray diffraction and ECD calculation. Compound 3 inhibited lipopolysaccharide-induced B lymphocytes cell proliferation with an IC50 value at 17.42 ± 1.57 μM while compound 5 inhibited concanavalin A-induced T lymphocytes cell proliferation with an IC50 value at 75.22 ± 6.10 μM. These data suggested that compounds 3 and 5 may possess potential immunosuppressive prospect.
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Affiliation(s)
- Ke Ye
- South Central University for Nationalities, Wuhan, China
| | - Xiao Lv
- South Central University for Nationalities, Wuhan, China
| | - Xian Zhang
- South Central University for Nationalities, Wuhan, China
| | - Pan-Pan Wei
- South Central University for Nationalities, Wuhan, China
| | - Zheng-Hui Li
- South Central University for Nationalities, Wuhan, China
| | - Hong-Lian Ai
- South Central University for Nationalities, Wuhan, China
| | | | - Ji-Kai Liu
- South Central University for Nationalities, Wuhan, China
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Lan M, Gao X, Duan X, Li H, Yu H, Li J, Zhao Y, Hao X, Zhao Y, Ding X, Wu G. Nematicidal activity of tirotundin and parthenolide isolated from Tithonia diversifolia and Chrysanthemum parthenium. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2022; 57:54-61. [PMID: 34983315 DOI: 10.1080/03601234.2021.2022945] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Acetylcholinesterase (AChE) is an enzyme that catalyzes acetylcholine into choline and acetic acid. Conventional pesticides, including organophosphates and carbamates target and inhibit the activity of AChE. To obtain more pesticide precursors that meet the safety requirements, more than 200 compounds were screened. Tirotundin and parthenolide identified as potential neurotoxins to nematodes were isolated from Tithonia diversifolia and Chrysanthemum parthenium, respectively. Their IC50 values were 6.89 ± 0.30 and 5.51 ± 0.23 μg/mL, respectively against the AChE isolated from Caenorhabditis elegans. AChE was inhibited in a dose-dependent manner using the two compounds. And the Lineweaver-Burk and Dixon plots indicated that tirotundin and parthenolide were reversible inhibitors against AChE, both inhibiting AChE in a mixed-type competitive manner and demonstrating these compounds may possess dual binding site AChE inhibitors. LC50 values of tirotundin and parthenolide against C. elegans were 9.16 ± 0.21 and 7.23 ± 0.48 μg/mL, respectively. These results provide a certain theoretical basis for the development and utilization of novel pesticides.
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Affiliation(s)
- Mingxian Lan
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Xi Gao
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
| | - Xiuan Duan
- Agro-Environmental Monitoring Center of Baoshan City, Green Development Center of Baoshan City, Baoshan, China
| | - Hongmei Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
| | - Hang Yu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
| | - Jinliang Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
| | - Yueqin Zhao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Xiaojiang Hao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Yuhan Zhao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Xiao Ding
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Guoxing Wu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, China
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13
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Capecchi A, Reymond JL. Classifying natural products from plants, fungi or bacteria using the COCONUT database and machine learning. J Cheminform 2021; 13:82. [PMID: 34663470 PMCID: PMC8524952 DOI: 10.1186/s13321-021-00559-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 10/02/2021] [Indexed: 01/13/2023] Open
Abstract
Natural products (NPs) represent one of the most important resources for discovering new drugs. Here we asked whether NP origin can be assigned from their molecular structure in a subset of 60,171 NPs in the recently reported Collection of Open Natural Products (COCONUT) database assigned to plants, fungi, or bacteria. Visualizing this subset in an interactive tree-map (TMAP) calculated using MAP4 (MinHashed atom pair fingerprint) clustered NPs according to their assigned origin ( https://tm.gdb.tools/map4/coconut_tmap/ ), and a support vector machine (SVM) trained with MAP4 correctly assigned the origin for 94% of plant, 89% of fungal, and 89% of bacterial NPs in this subset. An online tool based on an SVM trained with the entire subset correctly assigned the origin of further NPs with similar performance ( https://np-svm-map4.gdb.tools/ ). Origin information might be useful when searching for biosynthetic genes of NPs isolated from plants but produced by endophytic microorganisms.
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Affiliation(s)
- Alice Capecchi
- 1 Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Jean-Louis Reymond
- 1 Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland.
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14
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Ge Y, Ye F, Yang J, Spannenberg A, Jackstell R, Beller M. Palladium-Catalyzed Domino Aminocarbonylation of Alkynols: Direct and Selective Synthesis of Itaconimides. JACS AU 2021; 1:1257-1265. [PMID: 34467363 PMCID: PMC8397365 DOI: 10.1021/jacsau.1c00221] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Indexed: 06/13/2023]
Abstract
The first direct and selective synthesis of substituted itaconimdes by palladium-catalyzed aminocarbonylation of alkynols is reported. Key to the success of this transformation is the use of a novel catalyst system involving ligand L11 and appropriate reaction conditions. In the protocol here presented, easily available propargylic alcohols react with N-nucleophiles including aryl- and alkylamines as well as aryl hydrazines to provide a broad variety of interesting heterocycles with high catalyst activity and excellent selectivity. The synthetic utility of the protocol is demonstrated in the synthesis of natural product 11 with aminocarbonylation as the key step. Mechanistic studies and control experiments reveal the crucial role of the hydroxyl group in the substrate for the control of selectivity.
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Affiliation(s)
- Yao Ge
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
| | - Fei Ye
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
- Key
Laboratory of Organosilicon Chemistry and Material Technology of Ministry
of Education, Key Laboratory of Organosilicon Material Technology
of Zhejiang Province, Hangzhou Normal University, No. 2318, Yuhangtang Road, 311121 Hangzhou, P. R. China
| | - Ji Yang
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
| | - Anke Spannenberg
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
| | - Ralf Jackstell
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
| | - Matthias Beller
- Leibniz-Institut
für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, Rostock 18059, Germany
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