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Fedorov A, Dubovik V, Smirnov S, Chisty L, Khrustalev V, Slukin A, Alekseeva A, Stepanycheva E, Sendersky I, Berestetskiy A, Dalinova A. Structure-Activity Relationships of Natural C-9-Methyl-Substituted 10-Membered Lactones and Their Semisynthetic Derivatives. JOURNAL OF NATURAL PRODUCTS 2024. [PMID: 38587866 DOI: 10.1021/acs.jnatprod.3c01216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Fungal 10-membered lactones (TMLs), such as stagonolide A, herbarumin I, pinolidoxin, and putaminoxin, are promising candidates for the development of nature-derived herbicides. The aim of this study was to analyze the structure-activity relationships (SAR) of C-9-methyl-substituted TMLs with a multitarget bioassay approach to reveal compounds with useful (phytotoxic, entomotoxic, antimicrobial) or undesirable (cytotoxic) bioactivities. A new TML, stagonolide L (1), along with five known compounds (stagonolides D (2) and E (3), curvulides A (4) and B1/B2 (5a,b), and pyrenolide C (6)), were purified from cultures of the phytopathogenic fungus Stagonospora cirsii, and five semisynthetic derivatives of 3 and 4 (7-11) were obtained. The absolute configuration of 4 was revised to 2Z, 4S, 5S, 6R, and 9R. The identity of 5a,b and stagonolide H is discussed. The phytotoxicity of compound 4, the entomotoxicity of 5a,b, and nonselective toxicity of compound 6 are demonstrated. The latter confirms the hypothesis that the α,β-unsaturated carbonyl group is associated with the high general toxicity of TML, regardless of its position in the ring and other substituents. The epoxide in compound 4 is important for phytotoxicity. The revealed SAR patterns will be useful for further rational design of TML-based herbicides including curvulide A analogs with a 4,5-epoxy group.
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Affiliation(s)
- Anatoly Fedorov
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Vsevolod Dubovik
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Sergey Smirnov
- St. Petersburg State University, Universitetsky Avenue 26, St. Petersburg 198504, Russian Federation
| | - Leonid Chisty
- Research Institute of Hygiene, Occupational Pathology and Human Ecology, Federal Medical Biological Agency, p/o Kuz'molovsky, Kapitolovo, 93, St. Petersburg 188663, Russian Federation
| | - Victor Khrustalev
- Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklay Street, Moscow 117198, Russian Federation
- N. D. Zelinsky Institute of Organic Chemistry of Russian Academy of Sciences, Leninsky Prospect, 47, Moscow 119991, Russian Federation
| | - Anton Slukin
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Alena Alekseeva
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Elena Stepanycheva
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Igor Sendersky
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Alexander Berestetskiy
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
| | - Anna Dalinova
- All-Russian Institute of Plant Protection, Podbelskogo Street, 3, Pushkin, St. Petersburg 196608, Russian Federation
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Li TX, Dong HH, Xing L, He L, Zhang RY, Shao DY, Dai YX, Li DL, Xu CP. Aspercitrininone A, novel antibacterial polyketide featuring unusual spiral skeleton from Aspergillus cristatus. Fitoterapia 2024; 173:105827. [PMID: 38266661 DOI: 10.1016/j.fitote.2024.105827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 12/26/2023] [Accepted: 01/21/2024] [Indexed: 01/26/2024]
Abstract
Aspercitrininone A (1), a novel polyketide featuring an unprecedented tetracyclic 6/6/6/5 spiral skeleton, was obtained from the rice fermentation cultures of the fungus Aspergillus cristatus together with five known compounds (2-6). Their structures were determined by HRESIMS data, 1D and 2D NMR spectroscopic analysis, and electronic circular dichroism (ECD) calculations. Aspercitrininone A was revealed as a new type of C/D cycle spiral structure and an unusual addition product of o-quinoid form citrinin with 2-methylterrefuranone. Compounds 1, 4, and 5 exhibited potent antibacterial activities with minimal inhibitory concentration (MIC) values from 13.2 to 67.3 μg/mL against four strains of human pathogenic bacteria in vitro.
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Affiliation(s)
- Tian-Xiao Li
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Hong-Hui Dong
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Lei Xing
- Cigar Fermentation Technology Key Laboratory of Tobacco Industry, China Tobacco Sichuan Industrial Co., Ltd., Chengdu 610051, China
| | - Li He
- Technical Center of China Tobacco Jiangxi Industrial Co., Ltd., Nanchang 330096, China
| | - Rong-Ya Zhang
- Cigar Fermentation Technology Key Laboratory of Tobacco Industry, China Tobacco Sichuan Industrial Co., Ltd., Chengdu 610051, China
| | - Deng-Yin Shao
- Technical Center of China Tobacco Jiangxi Industrial Co., Ltd., Nanchang 330096, China.
| | - Yu-Xiang Dai
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Dong-Liang Li
- Cigar Fermentation Technology Key Laboratory of Tobacco Industry, China Tobacco Sichuan Industrial Co., Ltd., Chengdu 610051, China.
| | - Chun-Ping Xu
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
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