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Evidente A. The incredible story of ophiobolin A and sphaeropsidin A: two fungal terpenes from wilt-inducing phytotoxins to promising anticancer compounds. Nat Prod Rep 2024; 41:434-468. [PMID: 38131643 DOI: 10.1039/d3np00035d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Covering: 2000 to 2023This review presents the exceptional story of ophiobolin A (OphA) and sphaeropsidin A (SphA), a sesterterpene and a diterpene, respectively, which were initially isolated as fungal phytotoxins and subsequently shown to possess other interesting biological activities, including promising anticancer activities. Ophiobolin A is a phytotoxin produced by different fungal pathogens, all belonging to the Bipolaris genus. Initially, it was only known as a very dangerous phytotoxin produced by fungi attacking essential cereals, such as rice and barley. However, extensive and interesting studies were carried out to define its original carbon skeleton, which is characterized by a typical 5 : 8 : 5 ring system and shared with fusicoccins and cotylenins, and its phytotoxic activity on host and non-host plants. The biosynthesis of OphA was also defined by describing the different steps starting from mevalonate and through the rearrangement of the acyclic C-25 precursor lead the toxin is obtained. OphA was also produced as a bioherbicide from Drechslera gigantea and proposed for the biocontrol of the widespread and dangerous weed Digitaria sanguinaria. To date, more than sixty ophiobolins have been isolated from different fungi and their biological activities and structure-activity relationship investigated, which were also described using their hemisynthetic derivatives. In the last two decades, thorough studies have been performed on the potential anticancer activity of OphA and its original mode of action, attracting great interest from scientists. Sphaeropsidin A has a similar story. It was isolated as the main phytotoxin from Diplodia cupressi, the causal agent of Italian cypress canker disease, resulting in the loss of millions of plants in a few years in the Mediterranean basin. The damage to the forest, environment and ornamental heritage are noteworthy and economic losses are also suffered by tree nurseries and the wood industry. Six natural analogues of SphA were isolated and several interesting hemisynthetic derivatives were prepared to study its structure-activity relationship. Surprisingly, sphaeropsidin A showed other interesting biological activities, including antibiotic, antifungal, and antiviral. In the last decade, extensive studies have focused on the anticancer activity and original mode of action of SphA. Furthermore, specific hemisynthetic studies enable the preparation of derivatives of SphA, preserving its chromophore, which showed a noteworthy increase in anticancer activity. It has been demonstrated that ophiobolin A and sphaeropsidin A are promising natural products showing potent activity against some malignant cancers, such as brain glioblastoma and different melanomas.
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Affiliation(s)
- Antonio Evidente
- Institute of Sciences of Food Production, National Research Council, Via Amendola 122/O, 70125 Bari, Italy.
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Alleman C, Gadais C, Legentil L, Porée FH. Strategies to access the [5-8] bicyclic core encountered in the sesquiterpene, diterpene and sesterterpene series. Beilstein J Org Chem 2023; 19:245-281. [PMID: 36895430 PMCID: PMC9989678 DOI: 10.3762/bjoc.19.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 02/13/2023] [Indexed: 03/06/2023] Open
Abstract
Terpene compounds probably represent the most diversified class of secondary metabolites. Some classes of terpenes, mainly diterpenes (C20) and sesterterpenes (C25) and to a lesser extent sesquiterpenes (C15), share a common bicyclo[3.6.0]undecane core which is characterized by the presence of a cyclooctane ring fused to a cyclopentane ring, i.e., a [5-8] bicyclic ring system. This review focuses on the different strategies elaborated to construct this [5-8] bicyclic ring system and their application in the total synthesis of terpenes over the last two decades. The overall approaches involve the construction of the 8-membered ring from an appropriate cyclopentane precursor. The proposed strategies include metathesis, Nozaki-Hiyama-Kishi (NHK) cyclization, Pd-mediated cyclization, radical cyclization, Pauson-Khand reaction, Lewis acid-promoted cyclization, rearrangement, cycloaddition and biocatalysis.
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Affiliation(s)
- Cécile Alleman
- Université Rennes, Faculté de Pharmacie, CNRS ISCR UMR 6226, F-35000 Rennes, France
| | - Charlène Gadais
- Université Rennes, Faculté de Pharmacie, CNRS ISCR UMR 6226, F-35000 Rennes, France
| | - Laurent Legentil
- Université Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR - UMR 6226, F-35000 Rennes, France
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3
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Zhang Y, Liu H, Chen Y, Lu X, Liu Z, Tan H, Zhang W. Cyophiobiolins A-D, ophiobolin sestertepenoids from Cytospora rhizophorae. PHYTOCHEMISTRY 2022; 203:113352. [PMID: 35988743 DOI: 10.1016/j.phytochem.2022.113352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 07/21/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023]
Abstract
Cyophiobiolins A-D, four unreported ophiobolin-type sesterterpenoids, were isolated from Cytospora rhizophorae A761, an endophytic fungus from Gynochthodes officinalis. The structures of these undescribed compounds were fully characterized on the basis of extensively spectroscopic data (1D, 2D NMR and HRESIMS) and single-crystal X-ray diffraction analyses. Moreover, cyophiobiolins A-D were evaluated for in vitro cytotoxic, anti-inflammatory, and antibacterial activities. Cyophiobiolins A-B showed inhibitory potency against lipopolysaccharide (LPS)-induced oxide production with IC50 values of 66.3 μM and 53.3 μM, respectively.
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Affiliation(s)
- Yanjiang Zhang
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hongxin Liu
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, 510070, China
| | - Yuchan Chen
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, 510070, China
| | - Xiuxiang Lu
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhaoming Liu
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, 510070, China
| | - Haibo Tan
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Weimin Zhang
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, 510070, China
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4
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Nakada M. Research on the Efficient Enantioselective Total Synthesis of Useful Bioactive Polycyclic Compounds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahisa Nakada
- Department of Chemistry and Biochemistry, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 119-8555
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5
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The Surprising Story of Fusicoccin: A Wilt-Inducing Phytotoxin, a Tool in Plant Physiology and a 14-3-3-Targeted Drug. Biomolecules 2021; 11:biom11091393. [PMID: 34572605 PMCID: PMC8470340 DOI: 10.3390/biom11091393] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/07/2021] [Accepted: 09/15/2021] [Indexed: 12/13/2022] Open
Abstract
Fusicoccin is the α glucoside of a carbotricyclic diterpene, produced by the fungus Phomopsis amygdali (previously classified as Fusicoccum amygdali), the causal agent of almond and peach canker disease. A great interest in this molecule started when it was discovered that it brought about an irreversible stomata opening of higher plants, thereby inducing the wilting of their leaves. Since then, several studies were carried out to elucidate its biological activity, biosynthesis, structure, structure-activity relationships and mode of action. After sixty years of research and more than 1800 published articles, FC is still the most studied phytotoxin and one of the few whose mechanism of action has been elucidated in detail. The ability of FC to stimulate several fundamental plant processes depends on its ability to activate the plasma membrane H+-ATPase, induced by eliciting the association of 14-3-3 proteins, a class of regulatory molecules widespread in eukaryotes. This discovery renewed interest in FC and prompted more recent studies aimed to ascertain the ability of the toxin to influence the interaction between 14-3-3 proteins and their numerous client proteins in animals, involved in the regulation of basic cellular processes and in the etiology of different diseases, including cancer. This review covers the different aspects of FC research partially treated in different previous reviews, starting from its discovery in 1964, with the aim to outline the extraordinary pathway which led this very uncommon diterpenoid to evolve from a phytotoxin into a tool in plant physiology and eventually into a 14-3-3-targeted drug.
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6
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Chen Q, Li J, Ma Y, Yuan W, Zhang P, Wang G. Occurrence and biosynthesis of plant sesterterpenes (C25), a new addition to terpene diversity. PLANT COMMUNICATIONS 2021; 2:100184. [PMID: 34746758 PMCID: PMC8553974 DOI: 10.1016/j.xplc.2021.100184] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 03/03/2021] [Accepted: 03/28/2021] [Indexed: 05/21/2023]
Abstract
Terpenes, the largest group of plant-specialized metabolites, have received considerable attention for their highly diverse biological activities. Monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), and triterpenes (C30) have been extensively investigated at both the biochemical and molecular levels over the past two decades. Sesterterpenes (C25), an understudied terpenoid group, were recently described by plant scientists at the molecular level. This review summarizes the plant species that produce sesterterpenes and describes recent developments in the field of sesterterpene biosynthesis, placing a special focus on the catalytic mechanism and evolution of geranylfarnesyl diphosphate synthase and sesterterpene synthase. Finally, we propose several questions to be addressed in future studies, which may help to elucidate sesterterpene metabolism in plants.
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Affiliation(s)
- Qingwen Chen
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
| | - Jianxu Li
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yihua Ma
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Weiliang Yuan
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Guodong Wang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, China
- Corresponding author
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7
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Sato H, Li BX, Takagi T, Wang C, Miyamoto K, Uchiyama M. DFT Study on the Biosynthesis of Verrucosane Diterpenoids and Mangicol Sesterterpenoids: Involvement of Secondary-Carbocation-Free Reaction Cascades. JACS AU 2021; 1:1231-1239. [PMID: 34467361 PMCID: PMC8397367 DOI: 10.1021/jacsau.1c00178] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Indexed: 05/03/2023]
Abstract
Some experimental observations indicate that a sequential formation of secondary (2°) carbocations might be involved in some biosynthetic pathways, including those of verrucosane-type diterpenoids and mangicol-type sesterterpenoids, but it remains controversial whether or not such 2° cations are viable intermediates. Here, we performed comprehensive density functional theory calculations of these biosynthetic pathways. The results do not support previously proposed pathways/mechanisms: in particular, we find that none of the putative 2° carbocation intermediates is involved in either of the biosynthetic pathways. In verrucosane biosynthesis, the proposed 2° carbocations (II and IV) in the early stage are bypassed by the formation of the adjacent 3° carbocations and by unusual skeletal rearrangement reactions, and in the later stage, the putative 2° carbocation intermediates (VI, VII, and VIII) are not present as the proposed forms but as nonclassical structures between homoallyl and cyclopropylcarbinyl cations. In the mangicol biosynthesis, one of the two proposed 2° carbocations (X) is bypassed by a C-C bond-breaking reaction to generate a 3° carbocation with a C=C bond, while the other (XI) is bypassed by a strong hyperconjugative interaction leading to a nonclassical carbocation. We propose new biosynthetic pathways/mechanisms for the verrucosane-type diterpenoids and mangicol-type sesterterpenoids. These pathways are in good agreement with the findings of previous biosynthetic studies, including isotope-labeling experiments and byproducts analysis, and moreover can account for the biosynthesis of related terpenes.
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Affiliation(s)
- Hajime Sato
- Interdisciplinary
Graduate School of Medicine and Engineering, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Bi-Xiao Li
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Taisei Takagi
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Chao Wang
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kazunori Miyamoto
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanobu Uchiyama
- Graduate
School of Pharmaceutical Sciences, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Research
Initiative for Supra-Materials, Shinshu
University, 3-15-1 Tokida,
Ueda, Nagano 386-8567, Japan
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8
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Badart MP, Hawkins BC. Synthetic Strategies to Access Heteroatomic Spirocentres Embedded in Natural Products. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1379-2312] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
AbstractThe spirocyclic motif is abundant in natural products and provides an ideal three-dimensional template to interact with biological targets. With significant attention historically expended on the synthesis of flat-heterocyclic compound libraries, methods to access the less-explored three-dimensional medicinal-chemical space will continue to increase in demand. Herein, we highlight by reaction class the common strategies used to construct the spirocyclic centres embedded in a series of well-studied natural products.1 Introduction2 Cycloadditions3 Palladium-Catalysed Coupling Reactions4 Conjugate Additions5 Imines, Aminals, and Hemiaminal Ethers6 Mannich-Type Reactions7 Oxidative Dearomatisation8 Alkylation9 Organometallic Additions10 Conclusions
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9
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Zhao XL, Niu YC, Deng H, Luo DQ. Characterization and phytotoxicity of ophiobolins produced by Bipolaris setariae. MYCOSCIENCE 2021; 62:64-70. [PMID: 37090018 PMCID: PMC9157744 DOI: 10.47371/mycosci.2020.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 09/08/2020] [Accepted: 11/08/2020] [Indexed: 11/16/2022]
Abstract
The Bipolaris setariae NY1 strain, isolated from a diseased green foxtail plant in Henan Province, China, showed strong pathogenicity towards green foxtail. In order to clarify the role of phytotoxic substances in the fungal pathogenicity, bioassay-directed isolation and bioactivity assays of secondary metabolites produced by the fungal strain were carried out. Five ophiobolins were obtained: 3-anhydro-ophiobolin A, 6-epi-ophiobolin A, 6-epi-ophiobolin B, 3-anhydro-6-epi-ophiobolin B and ophiobolin I. Bioassays on punctured and intact detached leaves of green foxtail indicated that 3-anhydro-ophiobolin A was the most phytotoxic, followed by 6-epi-ophiobolin A. The other three ophiobolins appeared to be inactive against green foxtail. The effects of 3-anhydro-ophiobolin A and 6-epi-ophiobolin A were synergistic. The symptoms on green foxtail caused by 3-anhydro-ophiobolin A or its mixture with 6-epi-ophiobolin A resembled those caused by the fungus. 3-Anhydro-ophiobolin A and 6-epi-ophiobolin A are likely the main pathogenic determinants of B. setariae. 6-epi-Ophiobolin A caused cytotoxicity against five kinds of human cancer cells: human colon adenocarcinoma cells (HCT-8), human liver cancer cells (Bel-7402), human gastric cancer cells (BGC-823), human lung adenocarcinoma cells (A549), and human ovarian adenocarcinoma cells (A2780). The results provide information for the development of herbicides and antitumor potential of the ophiobolin sesterterpenes.
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Affiliation(s)
- Xing-Li Zhao
- Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
- College of Agriculture, Henan University of Science and Technology
| | - Yong-Chun Niu
- Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
| | - Hui Deng
- Key Laboratory of Microbial Resources, Ministry of Agriculture and Rural Affairs; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
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10
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Zhang X, Guo J, Cheng F, Li S. Cytochrome P450 enzymes in fungal natural product biosynthesis. Nat Prod Rep 2021; 38:1072-1099. [PMID: 33710221 DOI: 10.1039/d1np00004g] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Covering: 2015 to the end of 2020 Fungal-derived polyketides, non-ribosomal peptides, terpenoids and their hybrids contribute significantly to the chemical space of total natural products. Cytochrome P450 enzymes play essential roles in fungal natural product biosynthesis with their broad substrate scope, great catalytic versatility and high frequency of involvement. Due to the membrane-bound nature, the functional and mechanistic understandings for fungal P450s have been limited for quite a long time. However, recent technical advances, such as the efficient and precise genome editing techniques and the development of several filamentous fungal strains as heterologous P450 expression hosts, have led to remarkable achievements in fungal P450 studies. Here, we provide a comprehensive review to cover the most recent progresses from 2015 to 2020 on catalytic functions and mechanisms, research methodologies and remaining challenges in the fast-growing field of fungal natural product biosynthetic P450s.
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Affiliation(s)
- Xingwang Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China. and Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266237, China
| | - Jiawei Guo
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China.
| | - Fangyuan Cheng
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China.
| | - Shengying Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China. and Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266237, China
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Tao Y, Reisenauer K, Masi M, Evidente A, Taube JH, Romo D. Pharmacophore-Directed Retrosynthesis Applied to Ophiobolin A: Simplified Bicyclic Derivatives Displaying Anticancer Activity. Org Lett 2020; 22:8307-8312. [PMID: 33034457 PMCID: PMC7655722 DOI: 10.1021/acs.orglett.0c02938] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Pharmacophore-directed retrosynthesis applied to ophiobolin A led to bicyclic derivatives that were synthesized and display anticancer activity. Key features of the ultimate defensive synthetic strategy include a Michael addition/facially selective protonation sequence to set the critical C6 stereocenter and a ring-closing metathesis to form the cyclooctene. Cytotoxicity assays toward a breast cancer cell line (MDA-MB-231) confirm the anticipated importance of structural complexity for selectivity (vs MCF10A cells) while C3 variations modulate stability.
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Affiliation(s)
- Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Keighley Reisenauer
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Marco Masi
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Antonio Evidente
- Dipartimentodi Scienze Chimiche, Complesso Universitario Monte Sant’ Angelo, Napoli, Italy
| | - Joseph H. Taube
- Department of Biology, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Ave., Waco, TX 76798, United States
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Abstract
Covering: 1986 to 2020Natural products are an enduring source of chemical information useful for probing biologically relevant chemical space. Toward gathering further structure-activity relationship (SAR) information for a particular natural product, synthetic chemists traditionally proceeded first by a total synthesis effort followed by the synthesis of simplified derivatives. While this approach has proven fruitful, it often does not incorporate hypotheses regarding structural features necessary for bioactivity at the synthetic planning stage, but rather focuses on the rapid assembly of the targeted natural product; a goal that often supersedes the opportunity to gather SAR information en route to the natural product. Furthermore, access to simplified variants of a natural product possessing only the proposed essential structural features necessary for bioactivity, typically at lower oxidation states overall, is sometimes non-trivial from the original established synthetic route. In recent years, several synthetic design strategies were described to streamline the process of finding bioactive molecules in concert with fathering further SAR studies for targeted natural products. This review article will briefly discuss traditional retrosynthetic strategies and contrast them to selected examples of recent synthetic strategies for the investigation of biologically relevant chemical space revealed by natural products. These strategies include: diversity-oriented synthesis (DOS), biology-oriented synthesis (BIOS), diverted-total synthesis (DTS), analogue-oriented synthesis (AOS), two-phase synthesis, function-oriented synthesis (FOS), and computed affinity/dynamically ordered retrosynthesis (CANDOR). Finally, a description of pharmacophore-directed retrosynthesis (PDR) developed in our laboratory and initial applications will be presented that was initially inspired by a retrospective analysis of our synthetic route to pateamine A completed in 1998.
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Affiliation(s)
- Nathanyal J Truax
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76710, USA.
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13
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Quan Z, Dickschat JS. On the mechanism of ophiobolin F synthase and the absolute configuration of its product by isotopic labelling experiments. Org Biomol Chem 2020; 18:6072-6076. [PMID: 32725018 DOI: 10.1039/d0ob01470b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An ophiobolin F synthase homolog was discovered from Aspergillus calidoustus CBS121601. The cyclisation mechanism of this terpene synthase was investigated by extensive isotopic labelling experiments and the absolute configuration of its product ophiobolin F was elucidated by enantioselective deuteration.
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Affiliation(s)
- Zhiyang Quan
- Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
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14
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Abstract
Sesterterpenoids are known as a relatively small group of natural products. However, they represent a variety of simple to more complex structural types. This contribution focuses on the chemical structures of sesterterpenoids and how their structures are constructed in Nature.
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Affiliation(s)
- Takaaki Mitsuhashi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Ikuro Abe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
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15
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Bleve G, Gallo A, Altomare C, Vurro M, Maiorano G, Cardinali A, D'Antuono I, Marchi G, Mita G. In vitro activity of antimicrobial compounds against Xylella fastidiosa, the causal agent of the olive quick decline syndrome in Apulia (Italy). FEMS Microbiol Lett 2019; 365:4780293. [PMID: 29390137 DOI: 10.1093/femsle/fnx281] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 12/25/2017] [Indexed: 12/30/2022] Open
Abstract
Olive quick decline syndrome (OQDS) causes severe damages to the olive trees in Salento (Apulia, Italy) and poses a severe threat for the agriculture of Mediterranean countries. DNA-based typing methods have pointed out that OQDS is caused by a single outbreak strain of Xylella fastidiosa subsp. pauca referred to as CoDiRO or ST53. Since no effective control measures are currently available, the objective of this study was to evaluate in vitro antimicrobial activities of different classes of compounds against Salento-1 isolated by an OQDS affected plant and classified as ST53. A bioassay based on agar disk diffusion method revealed that 17 out of the 32 tested antibiotics did not affect bacterial growth at a dose of 5 μg disk-1. When we assayed micro-, ultra- and nano-filtered fractions of olive mill wastewaters, we found that the micro-filtered fraction resulted to be the most effective against the bacterium. Moreover, some phenolics (4-methylcathecol, cathecol, veratric acid, caffeic acid, oleuropein) were active in their pure form. Noteworthy, also some fungal extracts and fungal toxins showed inhibitory effects on bacterial growth. Some of these compounds can be further explored as potential candidate in future applications for curative/preventive treating OQDS-affected or at-risk olive plants.
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Affiliation(s)
- Gianluca Bleve
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 73100 Lecce, Italy
| | - Antonia Gallo
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 73100 Lecce, Italy
| | - Claudio Altomare
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 70126 Bari, Italy
| | - Maurizio Vurro
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 70126 Bari, Italy
| | - Gabriele Maiorano
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 73100 Lecce, Italy
| | - Angela Cardinali
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 70126 Bari, Italy
| | - Isabella D'Antuono
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 70126 Bari, Italy
| | - Guido Marchi
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, Sezione di Patologia Vegetale ed Entomologia, Università degli Studi, Piazzale delle Cascine 28, 50144 Firenze, Italy
| | - Giovanni Mita
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, 73100 Lecce, Italy
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16
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Shirley HJ, Jamieson ML, Brimble MA, Bray CD. A new family of sesterterpenoids isolated around the Pacific Rim. Nat Prod Rep 2019; 35:210-219. [PMID: 29547216 DOI: 10.1039/c7np00049a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Covering: 2009 up to the end of 2017 There has been a recent eruption in the number of known marine sesterterpenoids which have been isolated from Pacific Rim marine organisms. These compounds have novel and unusual structures that exhibit incredibly potent and varied bioactivities. This review details the isolation, biological testing and prospects for this exciting new family with discussion of their potential biogenetic origins.
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Affiliation(s)
- Harry J Shirley
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Megan L Jamieson
- School of Chemical Sciences, The University of Auckland, 23 Symonds St, Auckland 1010, New Zealand.
| | - Margaret A Brimble
- School of Chemical Sciences, The University of Auckland, 23 Symonds St, Auckland 1010, New Zealand.
| | - Christopher D Bray
- Department of Chemistry, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.
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17
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Masi M, Dasari R, Evidente A, Mathieu V, Kornienko A. Chemistry and biology of ophiobolin A and its congeners. Bioorg Med Chem Lett 2019; 29:859-869. [DOI: 10.1016/j.bmcl.2019.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 02/03/2019] [Accepted: 02/06/2019] [Indexed: 11/16/2022]
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18
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Savidov N, Gloriozova TA, Poroikov VV, Dembitsky VM. Highly oxygenated isoprenoid lipids derived from fungi and fungal endophytes: Origin and biological activities. Steroids 2018; 140:114-124. [PMID: 30326211 DOI: 10.1016/j.steroids.2018.10.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 09/19/2018] [Accepted: 10/09/2018] [Indexed: 02/07/2023]
Abstract
This mini review is devoted to highly oxygenated isoprenoid lipids (HOIL) that are produced by fungi and fungal endophytes from various ecological niches, both terrestrial and aquatic. Steroids were distributed as from edible cultivated fungi, as well as fungi collected in forests. Fungal endophytes were generally isolated from plants and cultured to obtain sufficient biomass. Marine fungi were obtained from marine brown and red algae and marine invertebrates such as sponges, corals, worms, crustacea or from marine sediments. HOIL isolated from the terrestrial ecosystem have the pharmacological potential on anti-hypercholesterolemic, anti-neoplastic, anti-eczematic and anti-inflammatory activity estimated with a confidence of 84-90%. HOIL that produced by marine fungal species are predicted as having anti-inflammatory and anti-hypercholesterolemic activity with a confidence of 82-91%. In addition, they may have potential acetylcholinesterase and cell adhesion molecule inhibitors estimated with a confidence of 86-88%.
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Affiliation(s)
- Nick Savidov
- Centre for Applied Research and Innovation, Lethbridge College, 3000 College Drive South, Lethbridge AB T1K 1L6, Canada
| | | | | | - Valery M Dembitsky
- Centre for Applied Research and Innovation, Lethbridge College, 3000 College Drive South, Lethbridge AB T1K 1L6, Canada; N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russian Federation; National Scientific Center of Marine Biology, Vladivostok 690041, Russian Federation.
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19
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Siless GE, Gallardo GL, Rodriguez MA, Rincón YA, Godeas AM, Cabrera GM. Metabolites from the Dark Septate Endophyte Drechslera sp. Evaluation by LC/MS and Principal Component Analysis of Culture Extracts with Histone Deacetylase Inhibitors. Chem Biodivers 2018; 15:e1800133. [PMID: 29851264 DOI: 10.1002/cbdv.201800133] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 05/28/2018] [Indexed: 12/12/2022]
Abstract
Secondary metabolites from the cultures of the dark septate fungal endophyte (DSE) Drechslera sp., isolated from the roots of rye grass (Lollium sp.) and cultured under different experimental conditions, are described here for the first time. The use of suberoylanilidehydroxamic acid (SAHA) and other histone deacetylase inhibitors as epigenetic modifiers in the culture medium was evaluated by LC/MS and LC/MS/MS. Several differences in the metabolite production were detected by means of supervised principal component analysis (PCA) of LC/MS data. The presence of the compounds in the culture medium or in the mycelium was compared. In order to confirm their structure, many of these natural products were isolated from a larger scale culture. These metabolites were characterized as prenylhydroxybenzoic acids and chromans, two compounds, one of each class were previously undescribed, prenylquinoids, diketopiperazines and macrosphelides. Some of the compounds, which were released to the medium, showed good antifungal activity, suggesting that these compounds could protect Lollium from fungal phytopatogens. The use of SAHA as an additive of the cultures also induced the release of hexosylphytosphyngosine to the culture medium. The biotransformation of the inhibitors was observed in addition to the production of antifungal metabolites, showing the ability of this endophytic strain to control xenobiotics.
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Affiliation(s)
- Gastón E Siless
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Buenos Aires, Argentina.,CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos aplicados a la Química Orgánica (UMYMFOR), Buenos Aires, Argentina
| | - Gabriela L Gallardo
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Buenos Aires, Argentina
| | - María Alejandra Rodriguez
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Buenos Aires, Argentina.,CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA), Buenos Aires, Argentina
| | - Yuliet A Rincón
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Buenos Aires, Argentina.,CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos aplicados a la Química Orgánica (UMYMFOR), Buenos Aires, Argentina
| | - Alicia M Godeas
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Buenos Aires, Argentina.,CONICET-Universidad de Buenos Aires, Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA), Buenos Aires, Argentina
| | - Gabriela M Cabrera
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Buenos Aires, Argentina
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20
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Zhu T, Lu Z, Fan J, Wang L, Zhu G, Wang Y, Li X, Hong K, Piyachaturawat P, Chairoungdua A, Zhu W. Ophiobolins from the Mangrove Fungus Aspergillus ustus. JOURNAL OF NATURAL PRODUCTS 2018; 81:2-9. [PMID: 29286660 DOI: 10.1021/acs.jnatprod.7b00335] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Seven new ophiobolins (1-5, 12, and 14) along with the 11 known analogues (6-11, 13, 15-18) were isolated from the ethyl acetate extracts of the liquid and solid cultures of the mangrove fungus Aspergillus ustus 094102. The structures including the absolute configurations of the seven new compounds were elucidated by spectroscopic analysis, chemical methods, and quantum ECD calculations. Compounds 4-8 and 11-15 showed cytotoxicities against the G3K, MCF-7, MD-MBA-231, MCF/Adr, A549, and HL-60 human cancer cell lines with the IC50 values ranging from 0.6 to 9.5 μM.
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Affiliation(s)
- Tonghan Zhu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
| | - Zhenyu Lu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
| | - Jie Fan
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
| | - Liping Wang
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
- Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences , Guiyang 550002, China
| | - Guoliang Zhu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
| | - Yi Wang
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
| | - Xia Li
- School of Ocean, Shandong University , Weihai 264209, China
| | - Kui Hong
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education of China, School of Pharmaceutical Sciences, Wuhan University , Wuhan 430071, China
| | - Pawinee Piyachaturawat
- Department of Physiology, Faculty of Science, Mahidol University , Bangkok 10400, Thailand
| | - Arthit Chairoungdua
- Department of Physiology, Faculty of Science, Mahidol University , Bangkok 10400, Thailand
| | - Weiming Zhu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China , Qingdao 266003, China
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21
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Minami A, Ozaki T, Liu C, Oikawa H. Cyclopentane-forming di/sesterterpene synthases: widely distributed enzymes in bacteria, fungi, and plants. Nat Prod Rep 2018; 35:1330-1346. [DOI: 10.1039/c8np00026c] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cyclization mechanisms and structural diversification strategies of novel cyclopentane-forming terpene synthases from various organisms are reviewed.
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Affiliation(s)
- Atsushi Minami
- Division of Chemistry
- Graduate School of Science
- Hokkaido University
- Sapporo
- Japan
| | - Taro Ozaki
- Division of Chemistry
- Graduate School of Science
- Hokkaido University
- Sapporo
- Japan
| | - Chengwei Liu
- Division of Chemistry
- Graduate School of Science
- Hokkaido University
- Sapporo
- Japan
| | - Hideaki Oikawa
- Division of Chemistry
- Graduate School of Science
- Hokkaido University
- Sapporo
- Japan
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22
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Ribaucourt A, Towers C, Josa‐Culleré L, Willenbrock F, Thompson AL, Hodgson DM. Aruncin B: Synthetic Studies, Structural Reassignment and Biological Evaluation. Chemistry 2017; 23:16525-16534. [PMID: 28815753 PMCID: PMC5725683 DOI: 10.1002/chem.201702949] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Indexed: 11/15/2022]
Abstract
A ring-closing alkene metathesis (RCM)/ oxyselenation-selenoxide elimination sequence was established to the sodium salts E- and Z-25 of the originally proposed structure for the recently isolated cytotoxin aruncin B (1), as well as to the sodium salt Z-34 of a related ethyl ether regioisomer; however, none of their corresponding free acids could be obtained. Their acid sensitivity, together with detailed analysis of the spectroscopic data indicated that profound structural revision was necessary. This led to reassignment of aruncin B as a Z-γ-alkylidenebutenolide Z-36. Although a related RCM/ oxyselenation-selenoxide elimination sequence was used to confirm the γ-alkylidenebutenolide motif, a β-iodo Morita-Baylis-Hillman reaction/ Sonogashira cross-coupling-5-exo-dig lactonisation sequence was subsequently developed, due to its brevity and flexibility for diversification. Aruncin B (36), together with 14 γ-alkylidenebutenolide analogues, were generated for biological evaluation.
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Affiliation(s)
- Aubert Ribaucourt
- Department of ChemistryUniversity of Oxford, Chemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Christopher Towers
- Department of OncologyUniversity of Oxford, Old Road Campus Research BuildingOxfordOX3 7DQUK
| | - Laia Josa‐Culleré
- Department of ChemistryUniversity of Oxford, Chemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - Frances Willenbrock
- Department of OncologyUniversity of Oxford, Old Road Campus Research BuildingOxfordOX3 7DQUK
| | - Amber L. Thompson
- Department of ChemistryUniversity of Oxford, Chemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
| | - David M. Hodgson
- Department of ChemistryUniversity of Oxford, Chemistry Research LaboratoryMansfield RoadOxfordOX1 3TAUK
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23
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Li BS, Wang Y, Proctor RSJ, Jin Z, Chi YR. Carbene-catalyzed desymmetrization of 1,3-diols: access to optically enriched tertiary alkyl chlorides. Chem Commun (Camb) 2016; 52:8313-6. [PMID: 27298081 DOI: 10.1039/c6cc03345h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The introduction of a chlorine atom to a carbon center in an enantioselective manner via conventional C-Cl bond formation is difficult. Here we report a new approach to this class of tertiary alkyl chlorides with high optical purities. Instead of forming a new C-Cl bond, our approach involves carbene-catalyzed desymmetrization of 2-chloro-1,3-diols as the key step to set up the chiral carbon center with excellent enantiomeric excess.
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Affiliation(s)
- Bao-Sheng Li
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
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24
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Narita K, Chiba R, Minami A, Kodama M, Fujii I, Gomi K, Oikawa H. Multiple Oxidative Modifications in the Ophiobolin Biosynthesis: P450 Oxidations Found in Genome Mining. Org Lett 2016; 18:1980-3. [DOI: 10.1021/acs.orglett.6b00552] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Koji Narita
- Division
of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Ryota Chiba
- Division
of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Atsushi Minami
- Division
of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Motoichiro Kodama
- The
United Graduate School of Agricultural Sciences, Tottori University, Tottori 680-8553, Japan
| | - Isao Fujii
- School
of Pharmacy, Iwate Medical University, Yahaba, Iwate 028-3694, Japan
| | - Katsuya Gomi
- Graduate
School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan
| | - Hideaki Oikawa
- Division
of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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25
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Hydrogen-Atom Transfer Reactions. Top Curr Chem (Cham) 2016; 374:17. [DOI: 10.1007/s41061-016-0018-2] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 03/01/2016] [Indexed: 02/04/2023]
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26
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Dasari R, Masi M, Lisy R, Ferdérin M, English LR, Cimmino A, Mathieu V, Brenner AJ, Kuhn JG, Whitten ST, Evidente A, Kiss R, Kornienko A. Fungal metabolite ophiobolin A as a promising anti-glioma agent: In vivo evaluation, structure-activity relationship and unique pyrrolylation of primary amines. Bioorg Med Chem Lett 2015; 25:4544-8. [PMID: 26341136 PMCID: PMC4592837 DOI: 10.1016/j.bmcl.2015.08.066] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 08/20/2015] [Accepted: 08/24/2015] [Indexed: 02/04/2023]
Abstract
Glioblastoma, the most common form of malignant primary brain tumor, is characterized by resistance to apoptosis, which is largely responsible for the low effectiveness of the classical chemotherapeutic approaches based on apoptosis induction in cancer cells. Previously, a fungal secondary metabolite ophiobolin A was found to have significant activity against apoptosis-resistant glioblastoma cells through the induction of a non-apoptotic cell death, thus, offering an innovative strategy to combat this type of cancer. The current work describes the results of a preliminary evaluation of ophiobolin A in an in vivo glioblastoma model and its chemical derivatization to establish first synthetically generated structure-activity relationship. The synthetic work has also led to the discovery of a unique reaction of ophiobolin A with primary amines suggesting the possibility of pyrrolylation of lysine residues on its intracellular target protein(s).
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Affiliation(s)
- Ramesh Dasari
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Marco Masi
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Romana Lisy
- Laboratoire de Cancérologie et de Toxicologie Expérimentale, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Marlène Ferdérin
- Laboratoire de Cancérologie et de Toxicologie Expérimentale, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Lance R English
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Alessio Cimmino
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Véronique Mathieu
- Laboratoire de Cancérologie et de Toxicologie Expérimentale, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Andrew J Brenner
- Cancer Therapy and Research Center, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - John G Kuhn
- Cancer Therapy and Research Center, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
| | - Steven T Whitten
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Robert Kiss
- Laboratoire de Cancérologie et de Toxicologie Expérimentale, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Alexander Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA.
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27
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Locato V, Uzal EN, Cimini S, Zonno MC, Evidente A, Micera A, Foyer CH, De Gara L. Low concentrations of the toxin ophiobolin A lead to an arrest of the cell cycle and alter the intracellular partitioning of glutathione between the nuclei and cytoplasm. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:2991-3000. [PMID: 25890975 DOI: 10.1093/jxb/erv110] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Ophiobolin A, a tetracyclic sesterpenoid produced by phytopathogenic fungi, is responsible for catastrophic losses in crop yield but its mechanism of action is not understood. The effects of ophiobolin A were therefore investigated on the growth and redox metabolism of Tobacco Bright Yellow-2 (TBY-2) cell cultures by applying concentrations of the toxin that did not promote cell death. At concentrations between 2 and 5 μM, ophiobolin A inhibited growth and proliferation of the TBY-2 cells, which remained viable. Microscopic and cytofluorimetric analyses showed that ophiobolin A treatment caused a rapid decrease in mitotic index, with a lower percentage of the cells at G1 and increased numbers of cells at the S/G2 phases. Cell size was not changed following treatment suggesting that the arrest of cell cycle progression was not the result of a block on cell growth. The characteristic glutathione redox state and the localization of glutathione in the nucleus during cell proliferation were not changed by ophiobolin A. However, subsequent decreases in glutathione and the re-distribution of glutathione between the cytoplasm and nuclei after mitosis occurring in control cells, as well as the profile of glutathionylated proteins, were changed in the presence of the toxin. The profile of poly ADP-ribosylated proteins were also modified by ophiobolin A. Taken together, these data provide evidence of the mechanism of ophiobolin A action as a cell cycle inhibitor and further demonstrate the link between nuclear glutathione and the cell cycle regulation, suggesting that glutathione-dependent redox controls in the nuclei prior to cell division are of pivotal importance.
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Affiliation(s)
- Vittoria Locato
- Centro Integrato di Ricerca, Università Campus Bio-Medico, Via Alvaro del Portillo, 00128 Roma, Italy
| | - Esther Novo Uzal
- Centro Integrato di Ricerca, Università Campus Bio-Medico, Via Alvaro del Portillo, 00128 Roma, Italy Departamento de Biología Vegetal, Universidad de Murcia, Campus Espinardo, Murcia, Spain
| | - Sara Cimini
- Centro Integrato di Ricerca, Università Campus Bio-Medico, Via Alvaro del Portillo, 00128 Roma, Italy
| | - Maria Chiara Zonno
- Istituto di Scienze delle Produzioni Alimentari, Consiglio Nazionale delle Ricerche, Via Amendola 122/O, 70125 Bari, Italy
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cinthia 4, 80126 Napoli, Italy
| | | | - Christine H Foyer
- Centre for Plant Sciences, Faculty of Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Laura De Gara
- Centro Integrato di Ricerca, Università Campus Bio-Medico, Via Alvaro del Portillo, 00128 Roma, Italy
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28
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Evidente A, Kornienko A, Cimmino A, Andolfi A, Lefranc F, Mathieu V, Kiss R. Fungal metabolites with anticancer activity. Nat Prod Rep 2014; 31:617-27. [PMID: 24651312 DOI: 10.1039/c3np70078j] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Covering: 1964 to 2013. Natural products from bacteria and plants have played a leading role in cancer drug discovery resulting in a large number of clinically useful agents. In contrast, the investigations of fungal metabolites and their derivatives have not led to a clinical cancer drug in spite of significant research efforts revealing a large number of fungi-derived natural products with promising anticancer activity. Many of these natural products have displayed notable in vitro growth-inhibitory properties in human cancer cell lines and select compounds have been demonstrated to provide therapeutic benefits in mouse models of human cancer. Many of these compounds are expected to enter human clinical trials in the near future. The present review discusses the reported sources, structures and biochemical studies aimed at the elucidation of the anticancer potential of these promising fungal metabolites.
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Affiliation(s)
- Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Napoli, Italy
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29
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Wang L, Xiao J. Advancement in Cascade [1,n]-Hydrogen Transfer/Cyclization: A Method for Direct Functionalization of Inactive C(sp3)H Bonds. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301153] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Bladt TT, Dürr C, Knudsen PB, Kildgaard S, Frisvad JC, Gotfredsen CH, Seiffert M, Larsen TO. Bio-activity and dereplication-based discovery of ophiobolins and other fungal secondary metabolites targeting leukemia cells. Molecules 2013; 18:14629-50. [PMID: 24287995 PMCID: PMC6290568 DOI: 10.3390/molecules181214629] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 11/15/2013] [Accepted: 11/21/2013] [Indexed: 12/27/2022] Open
Abstract
The purpose of this study was to identify and characterize fungal natural products (NPs) with in vitro bioactivity towards leukemia cells. We based our screening on a combined analytical and bio-guided approach of LC-DAD-HRMS dereplication, explorative solid-phase extraction (E-SPE), and a co-culture platform of CLL and stromal cells. A total of 289 fungal extracts were screened and we tracked the activity to single compounds in seven of the most active extracts. The novel ophiobolin U was isolated together with the known ophiobolins C, H, K as well as 6-epiophiobolins G, K and N from three fungal strains in the Aspergillus section Usti. Ophiobolins A, B, C and K displayed bioactivity towards leukemia cells with induction of apoptosis at nanomolar concentrations. The remaining ophiobolins were mainly inactive or only slightly active at micromolar concentrations. Dereplication of those ophiobolin derivatives possessing different activity in combination with structural analysis allowed a correlation of the chemical structure and conformation with the extent of bioactivity, identifying the hydroxy group at C3 and an aldehyde at C21, as well as the A/B-cis ring structure, as indispensible for the strong activity of the ophiobolins. The known compounds penicillic acid, viridicatumtoxin, calbistrin A, brefeldin A, emestrin A, and neosolaniol monoacetate were identified from the extracts and also found generally cytotoxic.
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Affiliation(s)
- Tanja Thorskov Bladt
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Claudia Dürr
- German Cancer Research Center, Molecular Genetics, Im Neuenheimer Feld 280, Heidelberg D-69120, Germany; E-Mail:
| | - Peter Boldsen Knudsen
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Sara Kildgaard
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Jens Christian Frisvad
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
| | - Charlotte Held Gotfredsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 201, Kgs. Lyngby DK-2800, Denmark; E-Mail:
| | - Martina Seiffert
- German Cancer Research Center, Molecular Genetics, Im Neuenheimer Feld 280, Heidelberg D-69120, Germany; E-Mail:
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (T.O.L.); Tel.: +49-6221-42-4586 (M.S.); Fax: +49-6221-42-2995 (M.S.); Tel.: +45-4525-2632 (T.O.L.); Fax: +45-4588-4148 (T.O.L.)
| | - Thomas Ostenfeld Larsen
- Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Building 221, Kgs. Lyngby DK-2800, Denmark; E-Mails: (T.T.B.); (P.B.K.); (S.K.); (J.C.F.)
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (T.O.L.); Tel.: +49-6221-42-4586 (M.S.); Fax: +49-6221-42-2995 (M.S.); Tel.: +45-4525-2632 (T.O.L.); Fax: +45-4588-4148 (T.O.L.)
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31
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Charpenay M, Boudhar A, Hulot C, Blond G, Suffert J. Expeditious cascade reactions: controlled syntheses of fenestradienes and cyclooctatrienes under palladium catalysis. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.089] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Ophiobolins P-T, five new cytotoxic and antibacterial sesterterpenes from the endolichenic fungus Ulocladium sp. Fitoterapia 2013; 90:220-7. [PMID: 23954177 DOI: 10.1016/j.fitote.2013.08.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 08/01/2013] [Accepted: 08/05/2013] [Indexed: 11/20/2022]
Abstract
Five ophiobolane sesterterpenes, ophiobolins P-T, and three known compounds, 6-epi-21,21-O-dihydroophiobolin G, 6-epi-ophiobolin G and 6-epi-ophiobolin K, were isolated from the acetone extract of the endolichenic fungus Ulocladium sp. by using OSMAC method. Their structures were elucidated on the basis of spectroscopic analysis. The absolute configuration of the 18,19-diol moieties in ophiobolin Q was assigned using the Frelek's method. The cytotoxic effects on KB and HepG2 cell lines, antibacterial activity against Bacillus subtilis, methicillin-resistant Staphylococcus aureus, and Bacille Calmette-Guerin were evaluated for all isolated compounds. Ophiobolin T and 6-epi-ophiobolin G exhibited the most potent cytotoxic activity against HepG2 with IC₅₀ of 0.24 and 0.37 μM, respectively. In antibacterial assay, ophiobolins P and T showed moderate antibacterial activity against B. subtilis and meticillin-resistant S. aureus. Ophiobolin T also displayed moderate antibacterial activity against the Bacille Calmette-Guerin strain.
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33
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Bury M, Novo-Uzal E, Andolfi A, Cimini S, Wauthoz N, Heffeter P, Lallemand B, Avolio F, Delporte C, Cimmino A, Dubois J, Van Antwerpen P, Zonno MC, Vurro M, Poumay Y, Berger W, Evidente A, De Gara L, Kiss R, Locato V. Ophiobolin A, a sesterterpenoid fungal phytotoxin, displays higher in vitro growth-inhibitory effects in mammalian than in plant cells and displays in vivo antitumor activity. Int J Oncol 2013; 43:575-85. [PMID: 23754298 DOI: 10.3892/ijo.2013.1979] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Accepted: 03/21/2013] [Indexed: 11/06/2022] Open
Abstract
Ophiobolin A, a sesterterpenoid produced by plant pathogenic fungi, was purified from the culture extract of Drechslera gigantea and tested for its growth-inhibitory activity in both plant and mammalian cells. Ophiobolin A induced cell death in Nicotiana tabacum L. cv. Bright Yellow 2 (TBY-2) cells at concentrations ≥10 µM, with the TBY-2 cells showing typical features of apoptosis-like cell death. At a concentration of 5 µM, ophiobolin A did not affect plant cell viability but prevented cell proliferation. When tested on eight cancer cell lines, concentrations <1 µM of ophiobolin A inhibited growth by 50% after 3 days of culture irrespective of their multidrug resistance (MDR) phenotypes and their resistance levels to pro-apoptotic stimuli. It is, thus, unlikely that ophiobolin A exerts these in vitro growth-inhibitory effects in cancer cells by activating pro-apoptotic processes. Highly proliferative human keratinocytes appeared more sensitive to the growth-inhibitory effects of ophiobolin A than slowly proliferating ones. Ophiobolin A also displayed significant antitumor activity at the level of mouse survival when assayed at 10 mg/kg in the B16F10 mouse melanoma model with lung pseudometastases. Ophiobolin A could, thus, represent a novel scaffold to combat cancer types that display various levels of resistance to pro-apoptotic stimuli and/or various MDR phenotypes.
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Affiliation(s)
- Marina Bury
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
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34
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Tsuna K, Noguchi N, Nakada M. Enantioselective Total Synthesis of (+)-Ophiobolin A. Chemistry 2013; 19:5476-86. [DOI: 10.1002/chem.201204119] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 01/16/2013] [Indexed: 11/05/2022]
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35
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Li K, Wang C, Yin G, Gao S. Construction of the basic skeleton of ophiobolin A and variecolin. Org Biomol Chem 2013; 11:7550-8. [DOI: 10.1039/c3ob41693c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Jiao ZW, Zhang SY, He C, Tu YQ, Wang SH, Zhang FM, Zhang YQ, Li H. Organocatalytic Asymmetric Direct C sp 3H Functionalization of Ethers: A Highly Efficient Approach to Chiral Spiroethers. Angew Chem Int Ed Engl 2012; 51:8811-5. [DOI: 10.1002/anie.201204274] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Indexed: 11/05/2022]
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37
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Jiao ZW, Zhang SY, He C, Tu YQ, Wang SH, Zhang FM, Zhang YQ, Li H. Organocatalytic Asymmetric Direct C sp 3H Functionalization of Ethers: A Highly Efficient Approach to Chiral Spiroethers. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204274] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Hog DT, Webster R, Trauner D. Synthetic approaches toward sesterterpenoids. Nat Prod Rep 2012; 29:752-79. [DOI: 10.1039/c2np20005h] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Tsuna K, Noguchi N, Nakada M. Convergent total synthesis of (+)-ophiobolin A. Angew Chem Int Ed Engl 2011; 50:9452-5. [PMID: 21915975 DOI: 10.1002/anie.201104447] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Kazuhiro Tsuna
- Department of Chemistry and Biochemistry, Faculty of Science and Engineering, Waseda University, Tokyo 169-8555, Japan
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40
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41
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Michalak M, Michalak K, Urbanczyk-Lipkowska Z, Wicha J. Synthetic Studies on Dicyclopenta[a,d]cyclooctane Terpenoids: Construction of the Core Structure of Fusicoccins and Ophiobolins on the Route Involving a Wagner-Meerwein Rearrangement. J Org Chem 2011; 76:7497-509. [DOI: 10.1021/jo201357p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michał Michalak
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Karol Michalak
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Zofia Urbanczyk-Lipkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Jerzy Wicha
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
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42
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Sugawara F, Strobel G, Strange RN, Siedow JN, Van Duyne GD, Clardy J. Phytotoxins from the pathogenic fungi Drechslera maydis and Drechslera sorghicola. Proc Natl Acad Sci U S A 2010; 84:3081-5. [PMID: 16593832 PMCID: PMC304811 DOI: 10.1073/pnas.84.10.3081] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Drechslera maydis, the causal agent of Southern corn leaf blight, and Drechslera sorghicola, the causal agent of leaf spot on Johnson grass, produce a series of phytotoxic sesterterpenoids. These sesterterpenoids belong to the ophiobolin family. One of them, ophiobolin I, was characterized by x-ray diffraction and served as a crucial reference compound for characterizing four other ophiobolins. All of the ophiobolins studied produce characteristic lesions on host plants at concentrations of 1 mM to 1 muM. The ophiobolin characterized as 6-epiophiobolin A is selectively toxic to corn bearing Texas-male-sterile (Tms) cytoplasm when assayed in a dark CO(2) fixation assay. It is plausible that these ophiobolins had a role in the 1970 corn-blight epidemic in North America.
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Affiliation(s)
- F Sugawara
- Department of Plant Pathology, Montana State University, Bozeman, MT 59717
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43
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Huang F, Yao ZK, Wang Y, Wang Y, Zhang J, Yu ZX. RhI-Catalyzed Two-Component [(5+2)+1] Cycloaddition Approach toward [5-8-5] Ring Systems. Chem Asian J 2010; 5:1555-9. [DOI: 10.1002/asia.201000053] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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44
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Zhang QW, Fan CA, Zhang HJ, Tu YQ, Zhao YM, Gu P, Chen ZM. Brønsted Acid Catalyzed Enantioselective Semipinacol Rearrangement for the Synthesis of Chiral Spiroethers. Angew Chem Int Ed Engl 2009; 48:8572-4. [DOI: 10.1002/anie.200904565] [Citation(s) in RCA: 188] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Zhang QW, Fan CA, Zhang HJ, Tu YQ, Zhao YM, Gu P, Chen ZM. Brønsted Acid Catalyzed Enantioselective Semipinacol Rearrangement for the Synthesis of Chiral Spiroethers. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904565] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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Williams DR. Chapter 7 Synthesis studies of dolabellanes and transannular processes leading to related diterpenes. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1874-6004(08)80011-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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47
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Noguchi N, Nakada M. Synthetic studies on (+)-ophiobolin A: asymmetric synthesis of the spirocyclic CD-ring moiety. Org Lett 2007; 8:2039-42. [PMID: 16671776 DOI: 10.1021/ol060437x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction; see text] Asymmetric synthesis of the spirocyclic CD-ring moiety of (+)-ophiobolin A is described. Fragment A, which was prepared via pig liver esterase (PLE)-mediated kinetic resolution, and fragment B, which was prepared via diastereoselective allylation and subsequent kinetic iodolactonization, were coupled to afford the allylsilane 2, which was successfully cyclized to the desired spirocyclic CD-ring moiety 1a in the presence of a Lewis acid.
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Affiliation(s)
- Naoyoshi Noguchi
- Department of Chemistry, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
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48
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Williams D, Robinson L, Nevill C, Reddy J. Strategies for the Synthesis of Fusicoccanes by Nazarov Reactions of Dolabelladienones: Total Synthesis of (+)-Fusicoauritone. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603853] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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49
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Williams DR, Robinson LA, Nevill CR, Reddy JP. Strategies for the synthesis of fusicoccanes by Nazarov reactions of dolabelladienones: total synthesis of (+)-fusicoauritone. Angew Chem Int Ed Engl 2007; 46:915-8. [PMID: 17171749 PMCID: PMC2924807 DOI: 10.1002/anie.200603853] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A synthetic pathway leading to (+)-fusicoauritone (1 ) is highlighted by the use of a Julia condensation for preparation of an eleven-membered dolabelladienone precursor for subsequent Nazarov cyclization to yield the 5-8-5 tricyclic diterpene skeleton.
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Affiliation(s)
- David R Williams
- Department of Chemistry, Indiana University, Bloomington, IN 47405-7102, USA.
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50
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Bour C, Blond G, Salem B, Suffert J. 4-exo-dig and 5-exo-dig Cyclocarbopalladations: an expeditious solution toward molecular complexity? Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.06.116] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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