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Gao Y, Stuhldreier F, Schmitt L, Wesselborg S, Guo Z, Zou K, Mándi A, Kurtán T, Liu Z, Proksch P. Induction of New Lactam Derivatives From the Endophytic Fungus Aplosporella javeedii Through an OSMAC Approach. Front Microbiol 2020; 11:600983. [PMID: 33250887 PMCID: PMC7672018 DOI: 10.3389/fmicb.2020.600983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 10/16/2020] [Indexed: 12/16/2022] Open
Abstract
Fermentation of the endophytic fungus Aplosporella javeedii on solid rice medium in presence of either 3.5% NaNO3 or 3.5% monosodium glutamate caused a significant change of the fungal metabolite pattern compared to fungal controls grown only on rice. Chemical investigation of the former fungal extracts yielded 11 new lactam derivatives, aplosporellins A-K (2-12), in addition to the known compound, pramanicin A (1). All of these compounds were not detected when the fungus was grown on rice medium without these activators thereby indicating the power of this OSMAC approach. The structures of the new compounds were elucidated by one- and two- dimensional NMR spectroscopy, DFT-NMR calculations and by mass spectrometry as well as by comparison with the literature whereas the absolute configuration of the lactam core was determined by TDDFT-ECD and OR calculations. Pramanicin A (1) showed strong cytotoxicity against human lymphoma (Ramos) and leukemia (Jurkat J16) cells with IC50 values of 4.7 and 4.4 μM, respectively. Mechanistic studies indicated that 1 activates caspase-3 and induces apoptotic cell death.
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Affiliation(s)
- Ying Gao
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Fabian Stuhldreier
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Laura Schmitt
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Sebastian Wesselborg
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Zhiyong Guo
- Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
| | - Kun Zou
- Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Zhen Liu
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
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Quintela-Varela H, Jamieson CS, Shao Q, Houk KN, Trauner D. Bioinspired Synthesis of (-)-PF-1018. Angew Chem Int Ed Engl 2020; 59:5263-5267. [PMID: 31788926 PMCID: PMC9899496 DOI: 10.1002/anie.201912452] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 11/09/2019] [Indexed: 11/10/2022]
Abstract
The combination of electrocyclizations and cycloadditions accounts for the formation of a range of fascinating natural products. Cascades consisting of 8π electrocyclizations followed by a 6π electrocyclization and a cycloaddition are relatively common. We now report the synthesis of the tetramic acid PF-1018 through an 8π electrocyclization, the product of which is immediately intercepted by a Diels-Alder cycloaddition. The success of this pericyclic cascade was critically dependent on the substitution pattern of the starting polyene and could be rationalized through DFT calculations. The completion of the synthesis required the instalment of a trisubstituted double bond by radical deoxygenation. An unexpected side product formed through 4-exo-trig radical cyclization could be recycled through an unprecedented triflation/fragmentation.
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Affiliation(s)
- Hugo Quintela-Varela
- Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 Müchen (Germany),Department of Chemistry, New York University, 100 Washington Square East, New York, NY 10003 (USA)
| | - Cooper S. Jamieson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095 (USA)
| | - Qianzhen Shao
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095 (USA),The College of Chemistry, Nankai University, Tianjin 300071 (China)
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095 (USA)
| | - Dirk Trauner
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY 10003 (USA)
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Quintela‐Varela H, Jamieson CS, Shao Q, Houk KN, Trauner D. Bioinspired Synthesis of (−)‐PF‐1018. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hugo Quintela‐Varela
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstrasse 5–13 81377 München Germany
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
| | - Cooper S. Jamieson
- Department of Chemistry and Biochemistry University of California, Los Angeles Los Angeles CA 90095 USA
| | - Qianzhen Shao
- Department of Chemistry and Biochemistry University of California, Los Angeles Los Angeles CA 90095 USA
- The College of Chemistry Nankai University Tianjin 300071 China
| | - K. N. Houk
- Department of Chemistry and Biochemistry University of California, Los Angeles Los Angeles CA 90095 USA
| | - Dirk Trauner
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
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Josa-Culleré L, Pretsch A, Pretsch D, Moloney MG. Antibacterial Mimics of Natural Products by Side-Chain Functionalization of Bicyclic Tetramic Acids. J Org Chem 2018; 83:10303-10317. [DOI: 10.1021/acs.joc.8b01453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laia Josa-Culleré
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G. Moloney
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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Josa-Culleré L, Christensen KE, Moloney MG. Diastereoselective reduction of the tricarbonyl moiety in bicyclic tetramates giving pyroglutamates. Org Biomol Chem 2018; 16:2705-2710. [PMID: 29589033 DOI: 10.1039/c8ob00187a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The reduction of C(6)-acyl bicyclic tetramic acids has been achieved with complete diastereoselectivity via catalytic hydrogenation using PtO2. The resulting pyroglutamates had potent antibacterial and anticancer properties and will allow the preparation of simple mimics of pyroglutamate-containing natural products.
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Affiliation(s)
- Laia Josa-Culleré
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, UK.
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Josa-Culleré L, Towers C, Thompson AL, Moloney MG. Chemoselective Formation and Reaction of Densely Functionalised Bicyclic Tetramic Acids and Their Biological Activity. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701393] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Laia Josa-Culleré
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Christopher Towers
- Department of Oncology; University of Oxford; Old Road Campus Research Building OX3 7LJ Oxford United Kingdom
| | - Amber L. Thompson
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Mark G. Moloney
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
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Abstract
Cladosin C was built up in ten steps comprising an N-acylation of dehydrovaline with a functionalised thioester, a Dieckmann cylisation, and an OH ⇒ NH2 exchange with 2,4-dimethoxybenzylamine.
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Affiliation(s)
- David Linder
- Department of Chemistry
- University Bayreuth
- D-95440 Bayreuth
- Germany
| | - Rainer Schobert
- Department of Chemistry
- University Bayreuth
- D-95440 Bayreuth
- Germany
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