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Gowans FA, Thach DQ, Zhu Z, Wang Y, Altamirano Poblano BE, Dovala D, Tallarico JA, McKenna JM, Schirle M, Maimone TJ, Nomura DK. Ophiobolin A Covalently Targets Mitochondrial Complex IV Leading to Metabolic Collapse in Cancer Cells. ACS Chem Biol 2024; 19:1260-1270. [PMID: 38739449 DOI: 10.1021/acschembio.4c00064] [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: 05/16/2024]
Abstract
Ophiobolin A (OPA) is a sesterterpenoid fungal natural product with broad anticancer activity. While OPA possesses multiple electrophilic moieties that can covalently react with nucleophilic amino acids on proteins, the proteome-wide targets and mechanism of OPA remain poorly understood in many contexts. In this study, we used covalent chemoproteomic platforms to map the proteome-wide reactivity of the OPA in a highly sensitive lung cancer cell line. Among several proteins that OPA engaged, we focused on two targets: lysine-72 of cytochrome c oxidase subunit 5A (COX5A) and cysteine-53 of mitochondrial hypoxia induced gene 1 domain family member 2A (HIGD2A). These two subunit proteins are part of complex IV (cytochrome C oxidase) within the electron transport chain and contributed significantly to the antiproliferative activity of OPA. OPA activated mitochondrial respiration in a COX5A- and HIGD2A-dependent manner, leading to an initial spike in mitochondrial ATP and heightened mitochondrial oxidative stress. OPA compromised mitochondrial membrane potential, ultimately leading to ATP depletion. We have used chemoproteomic strategies to discover a unique anticancer mechanism of OPA through activation of complex IV leading to compromised mitochondrial energetics and rapid cell death.
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Affiliation(s)
- Flor A Gowans
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720 United States
| | - Danny Q Thach
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Zhouyang Zhu
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Yangzhi Wang
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Belen E Altamirano Poblano
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Dustin Dovala
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Emeryville, California 94608, United States
| | - John A Tallarico
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Jeffrey M McKenna
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Basel CH-4056, Switzerland
| | - Markus Schirle
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Thomas J Maimone
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
| | - Daniel K Nomura
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, California 94720, United States
- Innovative Genomics Institute, Berkeley, California 94704, United States
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720 United States
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2
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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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3
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Li B, Tan C, Ma T, Jia Y. Bioinspired Total Synthesis of Bipolarolides A and B. Angew Chem Int Ed Engl 2024; 63:e202319306. [PMID: 38212293 DOI: 10.1002/anie.202319306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/13/2024]
Abstract
We have achieved the first total synthesis of bipolarolides A and B, which possess an intriguing and complex 5/6/6/6/5 caged pentacyclic skeleton with seven contiguous stereocenters. The synthesis features a lithium-halogen exchange/intermolecular nucleophilic addition to link two enantioenriched fragments, two ring-closing metathesis reactions to assemble the five- and eight-membered rings, and a bioinspired Prins reaction/ether formation cascade cyclization to construct the 5/6/6/6/5 caged skeleton.
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Affiliation(s)
- Bo Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Chuanzhen Tan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Tianhao Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
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4
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Yan D, Arakelyan J, Wan T, Raina R, Chan TK, Ahn D, Kushnarev V, Cheung TK, Chan HC, Choi I, Ho PY, Hu F, Kim Y, Lau HL, Law YL, Leung CS, Tong CY, Wong KK, Yim WL, Karnaukhov NS, Kong RY, Babak MV, Matsuda Y. Genomics-driven derivatization of the bioactive fungal sesterterpenoid variecolin: Creation of an unnatural analogue with improved anticancer properties. Acta Pharm Sin B 2024; 14:421-432. [PMID: 38261827 PMCID: PMC10793096 DOI: 10.1016/j.apsb.2023.08.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 07/25/2023] [Accepted: 08/24/2023] [Indexed: 01/25/2024] Open
Abstract
A biosynthetic gene cluster for the bioactive fungal sesterterpenoids variecolin (1) and variecolactone (2) was identified in Aspergillus aculeatus ATCC 16872. Heterologous production of 1 and 2 was achieved in Aspergillus oryzae by expressing the sesterterpene synthase VrcA and the cytochrome P450 VrcB. Intriguingly, the replacement of VrcB with homologous P450s from other fungal terpenoid pathways yielded three new variecolin analogues (5-7). Analysis of the compounds' anticancer activity in vitro and in vivo revealed that although 5 and 1 had comparable activities, 5 was associated with significantly reduced toxic side effects in cancer-bearing mice, indicating its potentially broader therapeutic window. Our study describes the first tests of variecolin and its analogues in animals and demonstrates the utility of synthetic biology for creating molecules with improved biological activities.
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Affiliation(s)
- Dexiu Yan
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Jemma Arakelyan
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Teng Wan
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Ritvik Raina
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong SAR, China
| | - Tsz Ki Chan
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Dohyun Ahn
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Vladimir Kushnarev
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
| | - Tsz Kiu Cheung
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Ho Ching Chan
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Inseo Choi
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Pui Yi Ho
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Feijun Hu
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Yujeong Kim
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Hill Lam Lau
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Ying Lo Law
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Chi Seng Leung
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Chun Yin Tong
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Kai Kap Wong
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Wing Lam Yim
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Nikolay S. Karnaukhov
- Moscow Clinical Research Center Named After A.S. Loginov, Moscow 111123, Russian Federation
| | - Richard Y.C. Kong
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Maria V. Babak
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
| | - Yudai Matsuda
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
- iGEM Team “VarieCure”, City University of Hong Kong, Hong Kong SAR, China
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5
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Reisenauer KN, Aroujo J, Tao Y, Ranganathan S, Romo D, Taube JH. Therapeutic vulnerabilities of cancer stem cells and effects of natural products. Nat Prod Rep 2023; 40:1432-1456. [PMID: 37103550 PMCID: PMC10524555 DOI: 10.1039/d3np00002h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Covering: 1995 to 2022Tumors possess both genetic and phenotypic heterogeneity leading to the survival of subpopulations post-treatment. The term cancer stem cells (CSCs) describes a subpopulation that is resistant to many types of chemotherapy and which also possess enhanced migratory and anchorage-independent growth capabilities. These cells are enriched in residual tumor material post-treatment and can serve as the seed for future tumor re-growth, at both primary and metastatic sites. Elimination of CSCs is a key goal in enhancing cancer treatment and may be aided by application of natural products in conjunction with conventional treatments. In this review, we highlight molecular features of CSCs and discuss synthesis, structure-activity relationships, derivatization, and effects of six natural products with anti-CSC activity.
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Affiliation(s)
| | - Jaquelin Aroujo
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | - Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | | | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor Univesrity, Waco, TX, USA
| | - Joseph H Taube
- Department of Biology, Baylor University, Waco, TX, USA.
- Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, USA
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6
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Wang Y, Yang J, Hu L, Bai R, Wang T, Xing X, Chen L, Ding G. LC-MS/MS-Guided Molecular Networking for Targeted Discovery of Undescribed and Bioactive Ophiobolins from Bipolaris eleusines. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:11982-11992. [PMID: 37523321 DOI: 10.1021/acs.jafc.3c03352] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
An integrated purification procedure through the LC-MS/MS-based molecular networking strategy combined with bioactive evaluation was first ushered for discovering bioactive ophiobolins from Bipolaris eleusines. Ophiobolins were mainly dispersed in five clusters, which were classified based on different ring systems and functional groups. Nine undescribed ophiobolins (1-6 and 9-11) and an undescribed natural product (8) along with two known analogs (7 and 12) were isolated in target. The undescribed structures were characterized by HR-ESI-MS, NMR spectra, and X-ray diffraction experiments. Compounds 3-12 exhibited strong phytotoxic effects on green foxtails by producing visible lesions, and compounds 1-10 and 12 displayed different levels of cytotoxic activities against cancer cell lines B16, Hep G2, and MCF-7, from which the possible structure-activity relationships were then suggested. The results have supported that bioactivity-guided molecular networking is an efficient strategy to expedite the discovery of undescribed bioactive natural products.
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Affiliation(s)
- Yanduo Wang
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, People's Republic of China
| | - Jian Yang
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, People's Republic of China
| | - Ling Hu
- Ningbo Academy of Inspection and Quarantine, Ningbo 315000, China
| | - Ruibin Bai
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, People's Republic of China
| | - Tielin Wang
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, People's Republic of China
| | - Xiaoke Xing
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, People's Republic of China
| | - Lin Chen
- Comprehensive Utilization of Edible and Medicinal Plant Resources Engineering Technology Research Center, Zhengzhou Key Laboratory of Synthetic Biology of Natural Products, Zhengzhou Key Laboratory of Medicinal Resources Research, Huanghe Science and Technology College, Zhengzhou 450006, People's Republic of China
| | - Gang Ding
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, People's Republic of China
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7
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Domka W, Bartusik-Aebisher D, Mytych W, Dynarowicz K, Aebisher D. The Use of Photodynamic Therapy for Head, Neck, and Brain Diseases. Int J Mol Sci 2023; 24:11867. [PMID: 37511625 PMCID: PMC10380422 DOI: 10.3390/ijms241411867] [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: 06/13/2023] [Revised: 07/16/2023] [Accepted: 07/22/2023] [Indexed: 07/30/2023] Open
Abstract
Head-neck cancers as a group have the 7th highest rate of incidence worldwide. The most often diagnosed disease of the head and neck is squamous cell carcinoma (90% of cases). Another specific group of tumors is brain tumors. These can be divided into primary tumors and secondary tumors associated with metastasis. Research shows that treating head and neck cancers continues to be problematic and challenging, and researchers are actively seeking new treatments that would improve survival rates and reduce side effects. Irradiation of tumor tissue with the optimal wavelength of light in photodynamic therapy (PDT) generates predominantly singlet oxygen in tissue-based photosensitizers (PSs) or reactive oxygen radicals in the case of vascular PSs leading to cellular apoptosis and necrosis. A very important feature of PDT is that cells cannot become immune to the effects of singlet oxygen or reactive oxygen radicals. However, photosensitizer (PS) transport is influenced by the specific structures of cancer tumors and the concentration of PS decreases in cells far from the vessel lumen. Therefore, PSs may not reach tumor interiors, which decreases therapy effectiveness. The use of drug carriers and 3rd generation PSs that contain biocompatible functional groups makes it possible to control transport. This review of the current literature on PDT was conducted through databases such as PubMed and Scopus. The types of publications considered included clinical studies and most of the articles included were published in English. Based on the publications collected, we conclude that researchers have demonstrated the potential of PDT as a therapeutic platform for head, neck, and brain diseases.
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Affiliation(s)
- Wojciech Domka
- Department of Otolaryngology, Medical College of The University of Rzeszów, 35-959 Rzeszów, Poland
| | - Dorota Bartusik-Aebisher
- Department of Biochemistry and General Chemistry, Medical College of the University of Rzeszów, 35-959 Rzeszów, Poland
| | - Wiktoria Mytych
- Students English Division Science Club, Medical College of The University of Rzeszów, 35-959 Rzeszów, Poland
| | - Klaudia Dynarowicz
- Center for Innovative Research in Medical and Natural Sciences, Medical College of The University of Rzeszów, 35-310 Rzeszów, Poland
| | - David Aebisher
- Department of Photomedicine and Physical Chemistry, Medical College of the University of Rzeszów, 35-959 Rzeszów, Poland
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8
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Gowans FA, Thach DQ, Wang Y, Altamirano Poblano BE, Dovala D, Tallarico JA, McKenna JM, Schirle M, Maimone TJ, Nomura DK. Ophiobolin A Covalently Targets Complex IV Leading to Mitochondrial Metabolic Collapse in Cancer Cells. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.09.531918. [PMID: 36945520 PMCID: PMC10029012 DOI: 10.1101/2023.03.09.531918] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Ophiobolin A (OPA) is a sesterterpenoid fungal natural product with broad anti-cancer activity. While OPA possesses multiple electrophilic moieties that can covalently react with nucleophilic amino acids on proteins, the proteome-wide targets and mechanism of OPA remain poorly understood in many contexts. In this study, we used covalent chemoproteomic platforms to map the proteome-wide reactivity of OPA in a highly sensitive lung cancer cell line. Among several proteins that OPA engaged, we focused on two targets-cysteine C53 of HIG2DA and lysine K72 of COX5A-that are part of complex IV of the electron transport chain and contributed significantly to the anti-proliferative activity. OPA activated mitochondrial respiration in a HIG2DA and COX5A-dependent manner, led to an initial spike in mitochondrial ATP, but then compromised mitochondrial membrane potential leading to ATP depletion. We have used chemoproteomic strategies to discover a unique anti-cancer mechanism of OPA through activation of complex IV leading to compromised mitochondrial energetics and rapid cell death.
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Affiliation(s)
- Flor A. Gowans
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA 94720 USA
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720 USA
| | - Danny Q. Thach
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
| | - Yangzhi Wang
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Belen E. Altamirano Poblano
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Dustin Dovala
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Emeryville, CA 94608 USA
| | - John A. Tallarico
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Cambridge, MA 02139 USA
| | - Jeffrey M. McKenna
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Markus Schirle
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Novartis Institutes for BioMedical Research, Cambridge, MA 02139 USA
| | - Thomas J. Maimone
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
| | - Daniel K. Nomura
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA 94720 USA
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 USA
- Novartis-Berkeley Translational Chemical Biology Institute, Berkeley, CA 94720 USA
- Innovative Genomics Institute, Berkeley, CA 94704 USA
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720 USA
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9
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Corti V, Barløse CL, Østergaard NL, Kristensen A, Jessen NI, Jørgensen KA. Organocatalytic Enantioselective Thermal [4 + 4] Cycloadditions. J Am Chem Soc 2023; 145:1448-1459. [PMID: 36603159 DOI: 10.1021/jacs.2c12750] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Chiral eight-membered carbocycles are important motifs in organic chemistry, natural product chemistry, chemical biology, and medicinal chemistry. The lack of synthetic methods toward their construction is a challenge preventing their rational design and stereoselective synthesis. The catalytic enantioselective [4 + 4] cycloaddition is one of the most straightforward and atom-economical methods to obtain chiral cyclooctadiene derivatives. We report the first organocatalytic asymmetric [4 + 4] cycloaddition of 9H-fluorene-1-carbaldehydes with electron-deficient dienes affording cyclooctadiene derivatives in good yields and with excellent control of peri-, diastereo-, and enantioselectivities. The reaction concept is based on the aminocatalytic formation of a polarized butadiene component incorporated into a cyclic extended π-system, with restricted conformational freedom, allowing for a stereocontrolled [4 + 4] cycloaddition. FMO analysis unveiled that the HOMO and LUMO of the two reacting partners resemble those of butadiene. The methodology allows for the construction of cyclooctadiene derivatives decorated with various functionalities. The cyclooctadienes were synthetically elaborated, allowing for structural diversity demonstrating their synthetic utility for the formation of, for example, chiral cyclobutene- or cyclooctane scaffolds. DFT computational studies shed light on the reaction mechanism identifying the preference for an initial but reversible [4 + 2] cycloaddition delivering an off-cycle catalyst resting state, from which catalyst elimination is not possible. The off-cycle catalyst-bound intermediate undergoes a retro-[4 + 2] cycloaddition, followed by a [4 + 4] cycloaddition generating a cycloadduct from which catalyst elimination is possible. The reaction pathway accounts for the observed peri-, diastereo-, and enantioselectivity of the organocatalytic [4 + 4] cycloaddition.
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Affiliation(s)
- Vasco Corti
- Department of Chemistry, Aarhus University, Aarhus C DK-8000, Denmark
| | | | | | - Anne Kristensen
- Department of Chemistry, Aarhus University, Aarhus C DK-8000, Denmark
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10
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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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11
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Law JA, Callen DP, Paola EL, Gomes G, Frederich JH. A Stereoselective Photoinduced Cycloisomerization Inspired by Ophiobolin A. Org Lett 2022; 24:6499-6504. [PMID: 35944279 PMCID: PMC10559756 DOI: 10.1021/acs.orglett.2c02272] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereoselective synthetic entry point to the 5-8-5 carbocyclic core of the ophiobolins was developed. This strategy exploits the chiral tertiary alcohol of ophiobolin A to guide assmebly of the 5-8-5 scaffold in a single step via a photoinitiated cycloisomerization. Mechanistic insights into the origin of stereocontrol in this reaction are described, as are efforts to elaborate the resultant fused 5-8-5 ring system to the pharmacophore of ophiobolin A.
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Affiliation(s)
- James A Law
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Daniel P Callen
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Elena L Paola
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Gabe Gomes
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - James H Frederich
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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12
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Mathieu V, Superchi S, Masi M, Scafato P, Kornienko A, Evidente A. In Vitro Effects of Fungal Phytotoxins on Cancer Cell Viability: First Insight into Structure Activity Relationship of a Potent Metabolite of Cochliobolus australiensis Radicinin. Toxins (Basel) 2022; 14:toxins14080517. [PMID: 36006179 PMCID: PMC9415302 DOI: 10.3390/toxins14080517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 07/15/2022] [Accepted: 07/23/2022] [Indexed: 01/18/2023] Open
Abstract
Natural compounds have always represented an important source for new drugs. Although fungi represent one such viable source, to date, no fungal metabolite has been marketed as an anticancer drug. Based on our work with phytotoxins as potential chemical scaffolds and our recent findings involving three phytopathogenic fungi, i.e., Cochliobolus australiensis, Kalmusia variispora and Hymenoscyphus fraxineus, herein, we evaluate the in vitro anti-cancer activity of the metabolites of these fungi by MTT assays on three cancer cell models harboring various resistance levels to chemotherapeutic drugs. Radicinin, a phytotoxic dihydropyranopyran-4,5-dione produced by Cochliobolus australiensis, with great potential for the biocontrol of the invasive weed buffelgrass (Cenchrus ciliaris), showed significant anticancer activity in the micromolar range. Furthermore, a SAR study was carried out using radicinin, some natural analogues and hemisynthetic derivatives prepared by synthetic methods developed as part of work aimed at the potential application of these molecules as bioherbicides. This investigation opens new avenues for the design and synthesis of novel radicinin analogues as potential anticancer agents.
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Affiliation(s)
- Veronique Mathieu
- Department of Pharmacotherapy and Pharmaceutics, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, Accès 2, 1050 Ixelles, Belgium
- ULB Cancer Research Center, Université Libre de Bruxelles (ULB), 1050 Bruxelles, Belgium
- Correspondence: (V.M.); (P.S.)
| | - Stefano Superchi
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy;
| | - Marco Masi
- Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte Sant’Angelo, Via Cintia 4, 80126 Napoli, Italy; (M.M.); (A.E.)
| | - Patrizia Scafato
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy;
- Correspondence: (V.M.); (P.S.)
| | - Alexander Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA;
| | - Antonio Evidente
- Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte Sant’Angelo, Via Cintia 4, 80126 Napoli, Italy; (M.M.); (A.E.)
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13
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Wang YQ, Xu K, Min L, Li CC. Asymmetric Total Syntheses of Hypoestin A, Albolic Acid, and Ceroplastol II. J Am Chem Soc 2022; 144:10162-10167. [PMID: 35657330 DOI: 10.1021/jacs.2c04633] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first asymmetric total synthesis of bioactive diterpenoid hypoestin A with an unprecedented [5-8-5-3] tetracyclic skeleton is accomplished in 15 steps from commercially available (R)-limonene. Furthermore, the second asymmetric total syntheses of sesterterpenoids albolic acid and ceroplastol II in 21 steps are also reported. The synthetically challenging and highly functionalized [X-8-5] (X = 5 or 7) tricarbocyclic ring systems found in hypoestin A, albolic acid, ceroplastol II, and schindilactone A, as well as other natural products, are efficiently and directly constructed via a unique intramolecular Pauson-Khand reaction of an allene-yne. This work represents the first reported use of the Pauson-Khand reaction to access synthetically challenging eight-membered-ring systems in natural product synthesis.
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Affiliation(s)
- Yong-Qiang Wang
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Kunhua Xu
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Long Min
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
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14
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Shevkar C, Pradhan P, Armarkar A, Pandey K, Kalia K, Paranagama P, Kate AS. Exploration of Potent Cytotoxic Molecules from Fungi in Recent Past to Discover Plausible Anticancer Scaffolds. Chem Biodivers 2022; 19:e202100976. [PMID: 35315213 DOI: 10.1002/cbdv.202100976] [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: 12/07/2021] [Accepted: 03/03/2022] [Indexed: 11/10/2022]
Abstract
Fungi are known to produce diverse scaffolds possessing unique biological activities, however, to date, no molecule discovered from a fungal source has reached the market as an anti-cancer drug. Every year number of cytotoxic molecules of fungal origin are getting published and critical analysis of those compounds is necessary to identify the potent ones. A review mentioning the best cytotoxic fungal metabolites and their status in the drug development was published in 2014. In this report, we have included 176 cytotoxic molecules isolated from fungi after 2014 and categorized them according to their potencies such as IC50 values below 1 μM, 1-5 μM, and 5-10 μM. The emphasis was given to those 42 molecules which have shown IC50 less than 1 μM and discussed to a great extent. This review shall provide potent scaffolds of fungal origin which can be given priority in the development as a drug candidate for cancer therapeutics.
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Affiliation(s)
- Chaitrali Shevkar
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
| | - Pranali Pradhan
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
| | - Ashwini Armarkar
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
| | - Komal Pandey
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
| | - Kiran Kalia
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
| | - Priyani Paranagama
- Department of Chemistry, University of Kelaniya, Dalugama, Kelaniya, 11600, Sri Lanka
| | - Abhijeet S Kate
- Department of Natural Products, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gujarat, 382355, India
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15
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Liang JJ, Yu WL, Yang L, Qin KM, Yin YP, Li D, Ni YH, Yan JJ, Zhong YX, Deng ZX, Hong K. Synthesis and structure-activity relationship study of a potent MHO7 analogue as potential anti-triple negative breast cancer agent. Eur J Med Chem 2022; 236:114313. [DOI: 10.1016/j.ejmech.2022.114313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/17/2022] [Accepted: 03/19/2022] [Indexed: 11/26/2022]
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16
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Liang JJ, Yu WL, Yang L, Xie BH, Qin KM, Yin YP, Yan JJ, Gong S, Liu TY, Zhou HB, Hong K. Design and synthesis of marine sesterterpene analogues as novel estrogen receptor α degraders for breast cancer treatment. Eur J Med Chem 2022; 229:114081. [PMID: 34992039 DOI: 10.1016/j.ejmech.2021.114081] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 12/19/2021] [Accepted: 12/23/2021] [Indexed: 11/29/2022]
Abstract
Targeted protein degradation using small molecules is an intriguing strategy for drug development. The marine sesterterpene compound MHO7 had been reported to be a potential ERα degradation agent. In order to further improve its biological activity, two series of novel MHO7 derivatives with long side chains were designed and identified as novel selective estrogen receptor down-regulators (SERDs). The growth inhibition activity of the novel SERD compounds were significantly affected by the type and length of the side chain. Most of the derivatives were significantly more potent than MHO7 against both drug-sensitive and drug-resistant breast cancer cells. Among them, compound 16a, with IC50 values of 0.41 μM against MCF-7 cell lines and 9.6-fold stronger than MHO7, was the most potential molecule. A whole-genome transcriptomic analysis of MCF-7 cells revealed that the mechanism of 16a against MCF-7 cell was similar with that of MHO7. The estrogen signaling pathway was the most affected among the disturbed genes, but the ERα degradation activity of 16a was observed higher than that of MHO7. Other effects of 16a were confirmed similar with MHO7, which means that the basic mechanisms of the derivatives are the same with the ophiobolin backbone, i.e. the degradation of ERα is mediated via proteasome-mediated process, the induction of apoptosis and the cell cycle arrest at the G1 phase. Meanwhile, a decrease of mitochondrial membrane potential and an increase of cellular ROS were also detected. Based on these results, as a novel modified ophiobolin derived compound, 16a may warrant further exploitation as a promising SERD candidate agent for the treatment of breast cancer.
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Affiliation(s)
- Jian-Jia Liang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Wu-Lin Yu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Liang Yang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Bao-Hua Xie
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Kong-Ming Qin
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Yu-Ping Yin
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Jing-Jing Yan
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Shuang Gong
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Ten-Yue Liu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Hai-Bing Zhou
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China
| | - Kui Hong
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, 430071, PR China.
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17
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Synthesis of the eight-membered carbocycle of brachialactone by intramolecular Mizoroki-Heck reaction. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Polygodial and Ophiobolin A Analogues for Covalent Crosslinking of Anticancer Targets. Int J Mol Sci 2021; 22:ijms222011256. [PMID: 34681916 PMCID: PMC8537666 DOI: 10.3390/ijms222011256] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/12/2021] [Accepted: 10/15/2021] [Indexed: 12/31/2022] Open
Abstract
In a search of small molecules active against apoptosis-resistant cancer cells, including glioma, melanoma, and non-small cell lung cancer, we previously prepared α,β- and γ,δ-unsaturated ester analogues of polygodial and ophiobolin A, compounds capable of pyrrolylation of primary amines and demonstrating double-digit micromolar antiproliferative potencies in cancer cells. In the current work, we synthesized dimeric and trimeric variants of such compounds in an effort to discover compounds that could crosslink biological primary amine containing targets. We showed that such compounds retain the pyrrolylation ability and possess enhanced single-digit micromolar potencies toward apoptosis-resistant cancer cells. Target identification studies of these interesting compounds are underway.
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19
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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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20
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Durrant DE, Smith EA, Goncharova EI, Sharma N, Alexander PA, Stephen AG, Henrich CJ, Morrison DK. Development of a High-throughput NanoBRET Screening Platform to Identify Modulators of the RAS/RAF Interaction. Mol Cancer Ther 2021; 20:1743-1754. [PMID: 34158349 PMCID: PMC8419108 DOI: 10.1158/1535-7163.mct-21-0175] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/24/2021] [Accepted: 06/15/2021] [Indexed: 01/09/2023]
Abstract
Activating mutations in RAS are found in approximately 30% of human cancers, resulting in the delivery of a persistent signal to critical downstream effectors that drive tumorigenesis. RAS-driven malignancies respond poorly to conventional cancer treatments and inhibitors that target RAS directly are limited; therefore, the identification of new strategies and/or drugs to disrupt RAS signaling in tumor cells remains a pressing therapeutic need. Taking advantage of the live-cell bioluminescence resonance energy transfer (BRET) methodology, we describe the development of a NanoBRET screening platform to identify compounds that modulate binding between activated KRAS and the CRAF kinase, an essential effector of RAS that initiates ERK cascade signaling. Using this strategy, libraries containing synthetic compounds, targeted inhibitors, purified natural products, and natural product extracts were evaluated. These efforts resulted in the identification of compounds that inhibit RAS/RAF binding and in turn suppress RAS-driven ERK activation, but also compounds that have the deleterious effect of enhancing the interaction to upregulate pathway signaling. Among the inhibitor hits identified, the majority were compounds derived from natural products, including ones reported to alter KRAS nanoclustering (ophiobolin A), to impact RAF function (HSP90 inhibitors and ROS inducers) as well as some with unknown targets and activities. These findings demonstrate the potential for this screening platform in natural product drug discovery and in the development of new therapeutic agents to target dysregulated RAS signaling in human disease states such as cancer.
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Affiliation(s)
- David E Durrant
- Laboratory of Cell and Developmental Signaling, NCI, Frederick, Maryland
| | - Emily A Smith
- Molecular Targets Program, Center of Cancer Research, NCI, Frederick, Maryland
- Basic Research Program, Leidos Biomedical Research, Inc., Frederick, Maryland
| | - Ekaterina I Goncharova
- Molecular Targets Program, Center of Cancer Research, NCI, Frederick, Maryland
- Biomedical Informatics and Data Science Directorate, NCI, Frederick, Maryland
| | - Nirmala Sharma
- Molecular Targets Program, Center of Cancer Research, NCI, Frederick, Maryland
| | - Patrick A Alexander
- NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, Maryland
| | - Andrew G Stephen
- NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, Maryland
| | - Curtis J Henrich
- Molecular Targets Program, Center of Cancer Research, NCI, Frederick, Maryland.
- Basic Research Program, Leidos Biomedical Research, Inc., Frederick, Maryland
| | - Deborah K Morrison
- Laboratory of Cell and Developmental Signaling, NCI, Frederick, Maryland.
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21
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Reisenauer KN, Tao Y, Das P, Song S, Svatek H, Patel SD, Mikhail S, Ingros A, Sheesley P, Masi M, Boari A, Evidente A, Kornienko A, Romo D, Taube J. Epithelial-mesenchymal transition sensitizes breast cancer cells to cell death via the fungus-derived sesterterpenoid ophiobolin A. Sci Rep 2021; 11:10652. [PMID: 34017048 PMCID: PMC8137940 DOI: 10.1038/s41598-021-89923-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 04/21/2021] [Indexed: 12/30/2022] Open
Abstract
The epithelial-mesenchymal transition (EMT) imparts properties of cancer stem-like cells, including resistance to frequently used chemotherapies, necessitating the identification of molecules that induce cell death specifically in stem-like cells with EMT properties. Herein, we demonstrate that breast cancer cells enriched for EMT features are more sensitive to cytotoxicity induced by ophiobolin A (OpA), a sesterterpenoid natural product. Using a model of experimentally induced EMT in human mammary epithelial (HMLE) cells, we show that EMT is both necessary and sufficient for OpA sensitivity. Moreover prolonged, sub-cytotoxic exposure to OpA is sufficient to suppress EMT-imparted CSC features including sphere formation and resistance to doxorubicin. In vivo growth of CSC-rich mammary cell tumors, is suppressed by OpA treatment. These data identify a driver of EMT-driven cytotoxicity with significant potential for use either in combination with standard chemotherapy or for tumors enriched for EMT features.
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Affiliation(s)
| | - Yongfeng Tao
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, USA
| | - Provas Das
- Department of Biology, Baylor University, Waco, TX, USA
| | - Shuxuan Song
- Department of Biology, Baylor University, Waco, TX, USA
| | | | | | | | - Alec Ingros
- Department of Biology, Baylor University, Waco, TX, USA
| | | | - Marco Masi
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, Naples, Italy
| | - Angela Boari
- Institute of Sciences and Food Production, CNR, Bari, Italy
| | - Antonio Evidente
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, Naples, Italy
| | - Alexander Kornienko
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX, USA
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX, USA
| | - Joseph Taube
- Department of Biology, Baylor University, Waco, TX, USA.
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22
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Li L, Turnbull WL, McDonald R, West FG. Lithium Hydroxide Assisted
Endo
‐Selective [4+4]‐Photocycloaddition of Pyran‐2‐ones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lei Li
- Department of Chemistry University of Alberta E3-43 Gunning-Lemieux Chemistry Centre Edmonton AB T6G 2G2 Canada
| | - William L. Turnbull
- Department of Chemistry University of Alberta E3-43 Gunning-Lemieux Chemistry Centre Edmonton AB T6G 2G2 Canada
| | - Robert McDonald
- X-Ray Crystallography Laboratory Department of Chemistry University of Alberta E3-43 Gunning-Lemieux Chemistry Centre Edmonton AB T6G 2G2 Canada
| | - F. G. West
- Department of Chemistry University of Alberta E3-43 Gunning-Lemieux Chemistry Centre Edmonton AB T6G 2G2 Canada
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23
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Xu D, Xue M, Shen Z, Jia X, Hou X, Lai D, Zhou L. Phytotoxic Secondary Metabolites from Fungi. Toxins (Basel) 2021; 13:261. [PMID: 33917534 PMCID: PMC8067579 DOI: 10.3390/toxins13040261] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 04/02/2021] [Accepted: 04/03/2021] [Indexed: 02/06/2023] Open
Abstract
Fungal phytotoxic secondary metabolites are poisonous substances to plants produced by fungi through naturally occurring biochemical reactions. These metabolites exhibit a high level of diversity in their properties, such as structures, phytotoxic activities, and modes of toxicity. They are mainly isolated from phytopathogenic fungal species in the genera of Alternaria, Botrytis, Colletotrichum, Fusarium, Helminthosporium, and Phoma. Phytotoxins are either host specific or non-host specific phytotoxins. Up to now, at least 545 fungal phytotoxic secondary metabolites, including 207 polyketides, 46 phenols and phenolic acids, 135 terpenoids, 146 nitrogen-containing metabolites, and 11 others, have been reported. Among them, aromatic polyketides and sesquiterpenoids are the main phytotoxic compounds. This review summarizes their chemical structures, sources, and phytotoxic activities. We also discuss their phytotoxic mechanisms and structure-activity relationships to lay the foundation for the future development and application of these promising metabolites as herbicides.
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Affiliation(s)
| | | | | | | | | | | | - Ligang Zhou
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, Beijing 100193, China; (D.X.); (M.X.); (Z.S.); (X.J.); (X.H.); (D.L.)
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Samperna S, Boari A, Vurro M, Salzano AM, Reveglia P, Evidente A, Gismondi A, Canini A, Scaloni A, Marra M. Arabidopsis Defense against the Pathogenic Fungus Drechslera gigantea Is Dependent on the Integrity of the Unfolded Protein Response. Biomolecules 2021; 11:biom11020240. [PMID: 33567651 PMCID: PMC7915340 DOI: 10.3390/biom11020240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/01/2021] [Accepted: 02/03/2021] [Indexed: 11/25/2022] Open
Abstract
Drechslera gigantea Heald & Wolf is a worldwide-spread necrotrophic fungus closely related to the Bipolaris genus, well-known because many member species provoke severe diseases in cereal crops and studied because they produce sesterpenoid phytoxins named ophiobolins which possess interesting biological properties. The unfolded protein response (UPR) is a conserved mechanism protecting eukaryotic cells from the accumulation of unfolded/misfolded proteins in the endoplasmic reticulum (ER). In plants, consolidated evidence supports the role of UPR in the tolerance to abiotic stress, whereas much less information is available concerning the induction of ER stress by pathogen infection and consequent UPR elicitation as part of the defense response. In this study, the infection process of D. gigantea in Arabidopsis thaliana wild type and UPR-defective bzip28 bzip60 double mutant plants was comparatively investigated, with the aim to address the role of UPR in the expression of resistance to the fungal pathogen. The results of confocal microscopy, as well as of qRT-PCR transcript level analysis of UPR genes, proteomics, microRNAs expression profile and HPLC-based hormone analyses demonstrated that ophiobolin produced by the fungus during infection compromised ER integrity and that impairment of the IRE1/bZIP60 pathway of UPR hampered the full expression of resistance, thereby enhancing plant susceptibility to the pathogen.
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Affiliation(s)
- Simone Samperna
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (S.S.); (A.G.); (A.C.)
| | - Angela Boari
- Institute of Sciences of Food Production, National Research Institute, 70126 Bari, Italy; (A.B.); (M.V.)
| | - Maurizio Vurro
- Institute of Sciences of Food Production, National Research Institute, 70126 Bari, Italy; (A.B.); (M.V.)
| | - Anna Maria Salzano
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, 80147 Naples, Italy; (A.M.S.); (A.S.)
| | - Pierluigi Reveglia
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (P.R.); (A.E.)
| | - Antonio Evidente
- Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy; (P.R.); (A.E.)
| | - Angelo Gismondi
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (S.S.); (A.G.); (A.C.)
| | - Antonella Canini
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (S.S.); (A.G.); (A.C.)
| | - Andrea Scaloni
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, 80147 Naples, Italy; (A.M.S.); (A.S.)
| | - Mauro Marra
- Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy; (S.S.); (A.G.); (A.C.)
- Correspondence:
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Li K, Gustafson KR. Sesterterpenoids: chemistry, biology, and biosynthesis. Nat Prod Rep 2020; 38:1251-1281. [PMID: 33350420 DOI: 10.1039/d0np00070a] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Covering: July 2012 to December 2019Over the last seven years, expanding research efforts focused on sesterterpenoids has led to the isolation, identification, and characterization of numerous structurally novel and biologically active sesterterpenoids. These newly reported sesterterpenoids provide diverse structures that often incorporate unprecedented ring systems and new carbon skeletons, as well as unusual functional group arrays. Biological activities of potential biomedical importance including suppression of cancer cell growth, inhibition of enzymatic activity, and modulation of receptor signaling, as well as ecologically important functions such as antimicrobial effects and deterrence of herbivorous insects have been associated with a variety of sesterterpenoids. There has also been a rapid growth in our knowledge of the genomics, enzymology, and specific pathways associated with sesterterpene biosynthesis. This has opened up new opportunities for future sesterterpene discovery and diversification through the expression of new cryptic metabolites and the engineered manipulation of associated biosynthetic machinery and processes. In this paper we reviewed 498 new sesterterpenoids, including their structures, source organisms, country of origin, relevant bioactivities, and biosynthesis.
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Affiliation(s)
- Keke Li
- College of Life Science, Dalian Minzu University, Dalian 116600, China.
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Vurro M, Townley HE, Morrison R, Boari A, Masi M, Evidente A. Augmented phytotoxic effect of nanoencapsulated ophiobolin A. Nat Prod Res 2020; 36:1143-1150. [PMID: 33342291 DOI: 10.1080/14786419.2020.1860975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Ophiobolin A is a secondary phytotoxic metabolite produced by some pathogenic fungal species responsible for severe plant diseases, considered to play a role in disease development and symptom appearance. Herein we investigated whether the phytotoxic activities of ophiobolin A against weed species could be improved by nanoencapsulation. Given the rapid natural degradation of the compound, it was hoped that nanoencapsulation would prolong the phytotoxic effects or enhance the bioactivity, thus leading to improved weed control capabilities. This article presents an assessment of the effectiveness of encapsulated ophiobolin A on 11 commonly found weed species, compared to the pure ophiobolin, to the particle alone, and a combination of mixed particles and ophiobolin A, by applying the solution droplets to both intact or injured leaf surface, on the adaxial or abaxial side. The bioassays showed the improved efficacy of the encapsulated ophiobolin, and the need for leaf lesions to diffuse the particles into the tissues.
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Affiliation(s)
- Maurizio Vurro
- Institute of Sciences of Food Production, National Research Council, Bari, Italy
| | - Helen E Townley
- Department of Engineering Science, Oxford University, Oxford, UK
| | - Rachel Morrison
- Department of Engineering Science, Oxford University, Oxford, UK
| | - Angela Boari
- Institute of Sciences of Food Production, National Research Council, Bari, Italy
| | - Marco Masi
- Department of Chemical Sciences, University of Naples "Federico II", Napoli, Italy
| | - Antonio Evidente
- Department of Chemical Sciences, University of Naples "Federico II", Napoli, Italy
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Zatout R, Masi M, Sangermano F, Vurro M, Zonno MC, Santoro E, Calabrò V, Superchi S, Evidente A. Drophiobiolins A and B, Bioactive Ophiobolan Sestertepenoids Produced by Dreschslera gigantea. JOURNAL OF NATURAL PRODUCTS 2020; 83:3387-3396. [PMID: 33074690 DOI: 10.1021/acs.jnatprod.0c00836] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Two new bioactive ophiobolan sestertepenoids, named drophiobiolins A and B (1 and 2) were isolated from Drechslera gigantea, a fungus proposed as a mycoherbicide for biocontrol of Digitaria sanguinalis. They were isolated together with ophiobolin A, the main metabolite, 6-epi-ophiobolin A, 3-anhydro-6-epi-ophiobolin A, and ophiobolin I. Drophiobolins A and B were characterized by NMR, HRESIMS, and chemical methods as 7-hydroxy-7-(6-hydroxy-6-methylheptan-2-yl)-1,9a-dimethyl-3-oxo-3,3a,6,6a,7,8,9,9a,10,10a-decahydrodicyclopenta [a,d][8]annulene-4-carbaldehyde and 6-(hydroxymethyl)-3',9,10a-trimethyl-5'-(2-methylprop-1-en-1-yl)-3a,4,4',5',10,10a-hexahydro-1H,3'H-spiro[dicyclopenta[a,d] [8]annulene-3,2'-furan]-5,7(2H,9aH)-dione. The relative configuration of drophiobolins A and B, which did not afford crystals suitable for X-ray analysis, was determined by NOESY experiments, while the absolute configuration was assigned by comparison of their experimental and TDDFT calculated electronic circular dichroism (ECD) spectra. The phytotoxic activity of drophiobolins A and B was tested by leaf-puncture assay on cultivated (Lycopersicon esculentum L.), as well as on host (Digitaria sanguinalis L.) and nonhost (Chenopodium album L.) weed plants, compared to that of ophiobolin A. Both of the newly identified ophiobolins showed significant phytotoxicity. Drophiobolins A and B exhibited cytotoxicity against Hela B cells with an IC50 value of 10 μM. However, they had a lesser or no effect against Hacat, H1299, and A431 cells when compared to that of ophiobolin A.
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Affiliation(s)
- Roukia Zatout
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
- Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri, Constantine1, BP, 325 Route de Aïn El Bey, 25017 Constantine, Algeria
| | - Marco Masi
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Felicia Sangermano
- Dipartimento di Biologia, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Maurizio Vurro
- Istituto di Scienze delle Produzioni Alimentari, CNR, Via Amendola 122/O, 70126 Bari, Italy
| | - Maria Chiara Zonno
- Istituto di Scienze delle Produzioni Alimentari, CNR, Via Amendola 122/O, 70126 Bari, Italy
| | - Ernesto Santoro
- Dipartimento di Scienze, Università della Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Viola Calabrò
- Dipartimento di Biologia, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Stefano Superchi
- Dipartimento di Scienze, Università della Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant'Angelo, Via Cintia 4, 80126 Napoli, Italy
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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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31
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Bailly C, Gao JM. Erinacine A and related cyathane diterpenoids: Molecular diversity and mechanisms underlying their neuroprotection and anticancer activities. Pharmacol Res 2020; 159:104953. [PMID: 32485283 DOI: 10.1016/j.phrs.2020.104953] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/10/2020] [Accepted: 05/20/2020] [Indexed: 12/14/2022]
Abstract
The presence of a fused 5/6/7 tricyclic core characterizes the group of cyathane diterpene natural products, that include more than 170 compounds, isolated from fungi such as Cyathus africanus and Hericium erinaceus. These compounds have a common biosynthetic precursor (cyatha-3,12-diene) and can be produced bio- or hemi-synthetically, or via total syntheses. Cyathane diterpenes display a range of pharmacological properties, including anti-inflammatory (possibly through binding to the iNOS protein) and neuroprotective effects. Many cyathanes like cyahookerin C, cyathin Q and cyafranines B and G can stimulate neurite outgrowth in cells, whereas conversely a few molecules (such as scabronine M) inhibit NGF-stimulated neurite outgrowth. The main anticancer cyathanes are erinacine A and cyathins Q and R, with a capacity to trigger cancer cell death dependent on the production of reactive oxygen species (ROS). These compounds, active both in vitro and in vivo, activate different signaling pathways in tumor cells to induce apoptosis (and autophagy) and to upregulate the expression of several proteins implicated in the organization and functioning of the actin cytoskeleton. An analysis of the functional analogy between erinacine A and other natural products known to interfere with the actin network in a ROS-dependent manner (notably cucurbitacin B) further supports the idea that erinacine A functions as a perturbator of the cytoskeleton organization. Collectively, we provide an overview of the molecular diversity of cyathane diterpenes and the main mechanisms of action of the lead compounds, with the objective to encourage further research with these fungal products. The anticancer potential of erinacine A deserves further attention but it will be necessary to better characterize the implicated targets and signaling pathways.
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Affiliation(s)
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, Shaanxi, People's Republic of China
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Hu YJ, Li LX, Han JC, Min L, Li CC. Recent Advances in the Total Synthesis of Natural Products Containing Eight-Membered Carbocycles (2009-2019). Chem Rev 2020; 120:5910-5953. [PMID: 32343125 DOI: 10.1021/acs.chemrev.0c00045] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Natural products containing eight-membered carbocycles constitute a class of structurally intriguing and biologically important molecules such as the famous diterpenes taxol and vinigrol. Such natural products are being increasingly investigated because of their fascinating architectural features and potent medicinal properties. However, synthesis of natural products with cyclooctane moieties has proved to be highly challenging. This review highlights the recently completed total syntheses of natural products with eight-membered carbocycles with a focus on strategic considerations. A collection of 27 representative studies from the literature covering the decade from 2009 to 2019 is described in chronological order with relevant studies grouped together, including syntheses of the same natural product by different research groups using different strategies. Finally, a summary and outlook including a discussion of the major features of each strategy used in the syntheses are presented. This review illustrates the diversity and creativity in the elegant synthetic designs of eight-membered carbocycles. We hope this review will provide timely illumination and beneficial guidance for future synthetic efforts for organic chemists who are interested in this area.
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Affiliation(s)
- Ya-Jian Hu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Li-Xuan Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Jing-Chun Han
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Long Min
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Chuang-Chuang Li
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
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Harmange Magnani CS, Thach DQ, Haelsig KT, Maimone TJ. Syntheses of Complex Terpenes from Simple Polyprenyl Precursors. Acc Chem Res 2020; 53:949-961. [PMID: 32202757 DOI: 10.1021/acs.accounts.0c00055] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
From structure elucidation and biogenesis to synthetic methodology and total synthesis, terpene natural products have profoundly influenced the development of organic chemistry. Moreover, their myriad functional attributes range from fragrance to pharmaceuticals and have had great societal impact. Ruzicka's formulation of the "biogenetic isoprene rule," a Nobel Prize winning discovery now over 80 years old, allowed for identification of higher order terpene (aka "isoprenoid") structures from simple five-carbon isoprene fragments. Notably, the isoprene rule still holds pedagogical value to students of organic chemistry today. Our laboratory has completed syntheses of over two dozen terpene and meroterpene structures to date, and the isoprene rule has served as a key pattern recognition tool for our synthetic planning purposes. At the strategic level, great opportunity exists in finding unique and synthetically simplifying ways to connect the formal C5 isoprene fragments embedded in terpenes. Biomimetic cationic polyene cyclizations represent the earliest incarnation of this idea, which has facilitated expedient routes to certain terpene polycycle classes. Nonetheless, a large swath of terpene chemical space remains inaccessible using this approach.In this Account, we describe strategic insight into our endeavors in terpene synthesis published over the last five years. We show how biosynthetic understanding, combined with a desire to utilize abundant and inexpensive [C5]n building blocks, has led to efficient, abiotic syntheses of multiple complex terpenes with disparate ring systems. Informed by nature, but unconstrained by its processes, our synthetic assembly exploits chemical reactivity across diverse reaction types-including radical, anionic, pericyclic, and metal-mediated transformations.First, we detail an eight-step synthesis of the cembrane diterpene chatancin from dihydrofarnesal using a bioinspired-but not -mimetic-cycloaddition. Next, we describe the assembly of the antimalarial cardamom peroxide using a polyoxygenation cascade to fuse multiple units of molecular oxygen onto a dimeric skeleton. This three-to-four-step synthesis arises from (-)-myrtenal, an inexpensive pinene oxidation product. We then show how a radical cyclization cascade can forge the hallmark cyclooctane ring system of the complex sesterterpene 6-epi-ophiobolin N from two simple polyprenyl precursors, (-)-linalool and farnesol. To access the related, more complex metabolite 6-epi-ophiobolin A, we exploited the plasticity of our synthetic route and found that use of geraniol (C10) rather than farnesol (C15) gave us the flexibility needed to address the additional oxidation found in this congener. Following this work, we describe two strategies to access several guaianolide sesquiterpenes. Retrosynthetic disconnection to monoterpenes, carvone or (-)-linalool, coupled with a powerful allylation strategy allowed us to address guaianolides with disparate stereochemical motifs. Finally, we examine a semisynthetic approach to the illicium sesquiterpenes from the abundant 15-carbon feedstock terpene (+)-cedrol using an abiotic ring shift and multiple C-H oxidation reactions inspired by a postulated biosynthesis of this natural product class.
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Affiliation(s)
| | - Danny Q. Thach
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Karl T. Haelsig
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Thomas J. Maimone
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
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Thach DQ, Brill ZG, Grover HK, Esguerra KV, Thompson JK, Maimone TJ. Total Synthesis of (+)‐6‐
epi
‐Ophiobolin A. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913150] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Danny Q. Thach
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
| | - Zachary G. Brill
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
| | - Huck K. Grover
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
| | - Kenneth V. Esguerra
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
| | - Jordan K. Thompson
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
| | - Thomas J. Maimone
- Department of Chemistry University of California, Berkeley 826 Latimer Hall Berkeley CA 94720 USA
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Thach DQ, Brill ZG, Grover HK, Esguerra KV, Thompson JK, Maimone TJ. Total Synthesis of (+)-6-epi-Ophiobolin A. Angew Chem Int Ed Engl 2020; 59:1532-1536. [PMID: 31693792 PMCID: PMC6980906 DOI: 10.1002/anie.201913150] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Indexed: 12/13/2022]
Abstract
The ophiobolin sesterterpenes are notable plant pathogens which have recently elicited significant chemical and biological attention because of their intriguing carbogenic frameworks, reactive functionalities, and emerging anticancer profiles. Reported herein is a total synthesis of (+)-6-epi-ophiobolin A in 14 steps, a task which addresses construction of the synthetically challenging spirocyclic tetrahydrofuran motif as well as several other key stereochemical problems. This work demonstrates a streamlined synthetic platform to complex ophiobolins leveraging disparate termination modes of a radical polycyclization cascade for divergent elaboration and functionalization.
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Affiliation(s)
| | | | | | | | | | - Thomas J. Maimone
- Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, CA, 94720, USA
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