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Nakajima M, Nagasawa S, Yamazaki K, Yazawa T, Yoneyama H, Kotaka Y, Nemoto T. Direct S 0 → T n Transition under Visible Light Irradiation Enabling Synthesis of a Pseudoindoxyl Scaffold. Org Lett 2024; 26:3289-3293. [PMID: 38568017 DOI: 10.1021/acs.orglett.4c00957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Pseudoindoxyl is a partial skeleton found in various natural products. Its light-absorption properties make it useful for the design of functional molecules. However, versatile synthesis methods have not yet been reported. In this report, we present a versatile synthetic method for pseudoindoxyls using the direct S0 → Tn transition under visible light irradiation. We also discuss the application of pseudoindoxyls as photocatalysts.
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Affiliation(s)
- Masaya Nakajima
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Sho Nagasawa
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Keita Yamazaki
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Tomohiro Yazawa
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Honoka Yoneyama
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Yuko Kotaka
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Tetsuhiro Nemoto
- Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8675, Japan
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Gao S, Lin X, Shi Y, Zhou H, Zheng X, Li M, Lin T. A New Hypoglycemic Prenylated Indole Alkaloid N-Oxide from Endophytic Fungus Pallidocercospora crystalline. Int J Mol Sci 2023; 24:ijms24108767. [PMID: 37240113 DOI: 10.3390/ijms24108767] [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: 04/21/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
A new prenylated indole alkaloid-Penicimutamide C N-oxide (1), a new alkaloid penicimutamine A (2), along with six known alkaloids were isolated from an endophytic fungus Pallidocercospora crystallina. A simple and accurate method was used to determine the N-O bond in the N-oxide group of 1. By using a β-cell ablation diabetic zebrafish model, compounds 1, 3, 5, 6 and 8 showed significantly hypoglycemic activities under the concentration of 10 μM. Further studies revealed that compounds 1 and 8 lowered the glucose level through promoting glucose uptake in zebrafish. In addition, all eight compounds showed no acute toxicity, teratogenicity, nor vascular toxicity in zebrafish under the concentrations range from 2.5 μΜ to 40 μM. Importantly, these results provide new lead compounds for the development of antidiabetes strategies.
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Affiliation(s)
- Shuo Gao
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Xiao Lin
- Department of Basic Medical Sciences, School of Medicine, Xiamen University, Xiamen 361102, China
| | - Yeqin Shi
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Hu Zhou
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Xiao Zheng
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Mingyu Li
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Ting Lin
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
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Structural analysis of previously unknown natural products using computational methods. J Nat Med 2022; 76:719-724. [PMID: 35849303 PMCID: PMC9411225 DOI: 10.1007/s11418-022-01637-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 06/22/2022] [Indexed: 10/24/2022]
Abstract
Natural products exhibit structural diversity, and biologically active natural products with unprecedented molecular skeletons can potentially be isolated from natural resources in the future. Although it has often been difficult to determine the structures and configurations of new compounds that do not resemble known compounds, the determination of the chemical structures, including the absolute stereo configuration, is very important in drug discovery research. In our efforts to find new bioactive natural products, we have identified novel compounds such as the ubiquitin-proteasome system inhibitors and osteoclast differentiation inhibitors. Various natural products, mixtures of stereoisomers of natural products, and compounds with novel skeletal structures were studied. In cases where it was difficult to determine the structures by NMR spectroscopy, we could successfully determine the chemical structures by computational chemistry. This review presents the results of structural analysis obtained using computational methods for several natural products that we have recently isolated.
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Abstract
Fungal bicyclo[2.2.2]diazaoctane indole alkaloids represent an important family of natural products with a wide-spectrum of biological activities. Although biomimetic total syntheses of representative compounds have been reported, the details of their biogenesis, especially the mechanisms for assembly of diastereomerically distinct and enantiomerically antipodal metabolites, have remained largely uncharacterized. Brevianamide A represents a basic form of the sub-family bearing a dioxopiperazine core and a rare 3-spiro-ψ-indoxyl skeleton. Here, we identified the Brevianamide A biosynthetic gene cluster from Penicillium brevicompactum NRRL 864 and elucidated the metabolic pathway. BvnE was revealed to be an essential isomerase/semi-pinacolase that specifies selective production of the natural product. Structural elucidation, molecular modeling, and mutational analysis of BvnE, and quantum chemical calculations provided mechanistic insights into the diastereoselective formation of the 3-spiro-ψ-indoxyl moiety in Brevianamide A. This occurs through a BvnE-controlled semi-pinacol rearrangement and a subsequent spontaneous intramolecular [4+2] hetero-Diels-Alder cycloaddition.
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Zhang P, Yuan XL, Du YM, Zhang HB, Shen GM, Zhang ZF, Liang YJ, Zhao DL, Xu K. Angularly Prenylated Indole Alkaloids with Antimicrobial and Insecticidal Activities from an Endophytic Fungus Fusarium sambucinum TE-6L. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:11994-12001. [PMID: 31618578 DOI: 10.1021/acs.jafc.9b05827] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Bioactivity-guided isolation of the endophytic fungus Fusarium sambucinum TE-6L residing in Nicotiana tabacum L. led to the discovery of two new angularly prenylated indole alkaloids (PIAs) with pyrano[2,3-g]indole moieties, amoenamide C (1) and sclerotiamide B (2), and four known biosynthetic congeners (3-6). Their structures were determined by comprehensive spectroscopic techniques, electronic circular dichroism (ECD), and X-ray diffraction. Compound 1 containing the bicyclo[2.2.2]diazaoctane core and indoxyl unit is rarely reported. All the compounds were evaluated for their antimicrobial and insecticidal activities. Notably, compounds 1-3 showed potent inhibitory effects against three human- and one plant-pathogenic bacterium, and seven plant-pathogenic fungi. Compounds 2-4 also exhibited remarkable larvicidal activity against first instar larvae of the cotton bollworm Helicoverpa armigera with mortality rates of 70.2%, 83.2%, and 70.5%, respectively. Further toxicity tests on zebrafish embryos were performed to evaluate the potential toxicity of PIAs. Of significance was that compound 3 in particular exhibited the highest activities but the lowest effects on the hatching of embryos among all the compounds. This study provides a basis for understanding developmental toxicity of PIAs exposure to zebrafish embryos, and also indicates the potential environmental risks of other natural compounds exposure in the aquatic ecosystem.
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Affiliation(s)
- Peng Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Xiao-Long Yuan
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Yong-Mei Du
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Huai-Bao Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Guo-Ming Shen
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Zhong-Feng Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Yu-Jun Liang
- College of Marine Life Sciences , Ocean University of China , Qingdao 266003 , People's Republic of China
| | - Dong-Lin Zhao
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
| | - Kuo Xu
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences , Qingdao 266101 , People's Republic of China
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Hu L, Zhang T, Liu D, Guan G, Huang J, Proksch P, Chen X, Lin W. Notoamide-type alkaloid induced apoptosis and autophagyviaa P38/JNK signaling pathway in hepatocellular carcinoma cells. RSC Adv 2019; 9:19855-19868. [PMID: 35519412 PMCID: PMC9065365 DOI: 10.1039/c9ra03640g] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 06/19/2019] [Indexed: 12/24/2022] Open
Abstract
Eleven notoamides including four new congeners were isolated fromAspergillus ochraceus. Notoamide G inhibited the viability of hepatocellular carcinoma cell lines by regulation of apoptosis and autophagy through P38/JNK signaling pathway.
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Affiliation(s)
- Likun Hu
- State Key Laboratory of Natural and Biomimetic Drugs
- Peking University
- Beijing
- P. R. China
| | - Ting Zhang
- Department of Microbiology and Infectious Disease Center
- School of Basic Medical Sciences
- Peking University Health Science Center
- Beijing 100191
- P. R. China
| | - Dong Liu
- State Key Laboratory of Natural and Biomimetic Drugs
- Peking University
- Beijing
- P. R. China
| | - Guiwen Guan
- Department of Microbiology and Infectious Disease Center
- School of Basic Medical Sciences
- Peking University Health Science Center
- Beijing 100191
- P. R. China
| | - Jian Huang
- State Key Laboratory of Natural and Biomimetic Drugs
- Peking University
- Beijing
- P. R. China
| | - Peter Proksch
- Institute für Pharmazeutische Biologie und Biotechnologie
- Heinrich-Heine- Universität Düsseldorf
- 40225 Düsseldorf
- Germany
| | - Xiangmei Chen
- Department of Microbiology and Infectious Disease Center
- School of Basic Medical Sciences
- Peking University Health Science Center
- Beijing 100191
- P. R. China
| | - Wenhan Lin
- State Key Laboratory of Natural and Biomimetic Drugs
- Peking University
- Beijing
- P. R. China
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