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Oinuma Y, Kanehara R, Maeda H, Nishikawa T, Konno K, Tanaka K, Hashimoto M. Isolation of Paraphaeoketones: A Plausible Biosynthetic Explanation for Paraphaeolactones via a Benzilic Acid Rearrangement Rather than a Favorskii Rearrangement. JOURNAL OF NATURAL PRODUCTS 2024; 87:1159-1170. [PMID: 38552032 DOI: 10.1021/acs.jnatprod.4c00104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Paraphaeoketones A-C (1-3) were isolated from the culture broth of Paraphaeosphaeria sp. KT4192. Their structures and relative configurations were determined using spectroscopic analysis and verified through density functional theory (DFT)-based chemical shift calculations. The absolute configurations of these compounds were determined by comparing the experimental electronic circular dichroism (ECD) spectra with those based on DFT calculations. We also propose a plausible biosynthetic route to 1-3. While our prior studies on the isolation and structural elucidation of paraphaeolactones (e.g., 4) led us to suggest a Favorskii rearrangement for their biosynthesis, the isolation of 2 prompted the proposal of an alternative biosynthesis for 4, featuring a benzilic acid rearrangement of 2. Moreover, an in vitro conversion of 2 into 4 was achieved successfully, suggesting that a biosynthetic pathway for paraphaeolactones involving a benzilic acid rearrangement is more plausible than the previously presumed Favorskii rearrangement pathway. Arguments based on DFT calculations for these pathways are also described.
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Affiliation(s)
- Yuki Oinuma
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Ryuhi Kanehara
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Hayato Maeda
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Toshio Nishikawa
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Katsuhiro Konno
- Institute of Natural Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Kazuaki Tanaka
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
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Miura S, Ishida K, Tanaka K, Morita E, Hashimoto M. Integrasone Derivatives Isolated from Lepteutypa sp. KT4162 and Their Anti-HIV-1 Integrase Activity. JOURNAL OF NATURAL PRODUCTS 2023; 86:1019-1024. [PMID: 36898139 DOI: 10.1021/acs.jnatprod.3c00065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Five integrasone derivatives, integrasone C (1), isointegrasone C (2), integrasone D1 (3), integrasone D2 (4), and integrasone E (5), were isolated from the culture broth of Lepteutypa sp. KT4162. Neither conventional NMR analyses nor DFT (density functional theory)-based computationally assisted chemical shift discussions were sufficient to elucidate the relative configuration of the 1,4-epoxydiol moiety. A combined analysis using the calculated nJCH values and HMBC spectra was helpful to establish the relative configuration. The absolute configurations of 1-5 were determined using DFT-based ECD (electronic circular dichroism) spectral analysis. Biological assays of these compounds revealed that 2 potently inhibits HIV-1 integrase without cytotoxicity.
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Affiliation(s)
- Satomi Miura
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan
| | - Kotaro Ishida
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
| | - Kazuaki Tanaka
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan
| | - Eiji Morita
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki 036-8561, Japan
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Kanehara R, Tonouchi A, Konno K, Koshino H, Hashimoto M. Isolation of cyclohumulanoids from Daedaleopsis tricolor and their biosynthesis based on in silico simulations. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Hayasaka A, Hashimoto K, Konno K, Tanaka K, Hashimoto M. Isolation, Identification, and DFT-based Conformational Analysis of Sesquikarahanadienone and its Congeners from Freshwater Dothideomycetes Neohelicascus aquaticus KT4120. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ayane Hayasaka
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Kazuki Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Katsuhiro Konno
- Institute of Natural Medicine, University of Toyama, Toyama 930-0194, Japan
| | - Kazuaki Tanaka
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3-Bunkyo-cho, Hirosaki, 036-8561, Japan
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Pham HT, Doan TP, Kim HW, Kim TW, Park SY, Kim H, Lee M, Kim KH, Oh WK, Lim YW, Kang KB. Cyclohumulanoid Sesquiterpenes Induced by the Noncompetitive Coculture of Phellinus orientoasiaticus and Xylodon flaviporus. JOURNAL OF NATURAL PRODUCTS 2022; 85:511-518. [PMID: 35073082 DOI: 10.1021/acs.jnatprod.1c01022] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Microbial cocultivation has been applied as a strategy to induce the biosynthesis of specialized metabolites. However, most previous studies have focused on competitive interactions between test strains. During our LC-MS-based chemical screening of randomized cocultures of Basidiomycetous fungi, we discovered that the coculture of Phellinus orientoasiaticus (Hymenochaetaceae) and Xylodon flaviporus (Schizoporaceae) induces multiple metabolites, although they did not show any competitive morphology. Targeted isolation yielded three new sesquiterpenes (1-3) along with five known analogues (4-8). The structures of the isolates were determined by MS and NMR experiments as well as electronic circular dichroism analysis. LC-MS analysis suggested that cyclohumulanoids of illudane-, sterpurane-, and tremulane-type scaffolds (1-7) were produced by P. orientoasiaticus, whereas a drimane-type sesquiterpene (8) was produced by X. flaviporus. None of the isolates exhibited antifungal activity or cytotoxicity, and compounds 1-7 exhibited NO production of LPS-treated RAW276.4 cells in a range of 15.9% to 38.0% at 100 μM.
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Affiliation(s)
- Huong T Pham
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Thi Phuong Doan
- College of Pharmacy, Seoul National University, Seoul 08826, Korea
| | - Hyun Woo Kim
- College of Pharmacy, Seoul National University, Seoul 08826, Korea
| | - Tae Wan Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea
| | - So-Yeon Park
- College of Pharmacy, Sunchon National University, Suncheon 57922, Korea
| | - Hangun Kim
- College of Pharmacy, Sunchon National University, Suncheon 57922, Korea
| | - Mina Lee
- College of Pharmacy, Sunchon National University, Suncheon 57922, Korea
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea
| | - Won Keun Oh
- College of Pharmacy, Seoul National University, Seoul 08826, Korea
| | - Young Woon Lim
- School of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 08826, Korea
| | - Kyo Bin Kang
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
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