1
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Patiny L, Musallam H, Bolaños A, Zasso M, Wist J, Karayilan M, Ziegler E, Liermann JC, Schlörer NE. NMRium: Teaching nuclear magnetic resonance spectra interpretation in an online platform. Beilstein J Org Chem 2024; 20:25-31. [PMID: 38213841 PMCID: PMC10777324 DOI: 10.3762/bjoc.20.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 12/21/2023] [Indexed: 01/13/2024] Open
Abstract
NMRium is the first web-based software that allows displaying, processing, interpretation, and teaching of 1D and 2D NMR data in a user-friendly interface. It can import the most common data formats (e.g., JCAMP-DX, Bruker, Varian, and Jeol). While the scope for the use of NMRium encompasses a variety of applications such as being a component in data repositories or electronic lab notebooks (ELN), performing structure elucidation or preparing raw spectral data for publication, it also excels in enhancing teaching of NMR interpretation. In this paper, we present some current possibilities of this new tool. Several series of exercises are already provided on https://www.nmrium.org/teaching.
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Affiliation(s)
- Luc Patiny
- Zakodium Sàrl, Route d'Echandens 6b, 1027 Lonay, Switzerland
| | - Hamed Musallam
- Faculty of Chemistry and Earth Sciences, Friedrich Schiller University, 07743 Jena, Germany
| | | | - Michaël Zasso
- Zakodium Sàrl, Route d'Echandens 6b, 1027 Lonay, Switzerland
| | - Julien Wist
- Chemistry Department, Universidad del Valle, Cali 76001, Colombia
- Australian National Phenome Center, and Center for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth WA6150, Australia
| | - Metin Karayilan
- Department of Chemistry, Case Western Reserve University (CWRU), Cleveland, Ohio 44106, United States,
| | - Eva Ziegler
- Department of Chemistry, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Johannes C Liermann
- Department of Chemistry, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Nils E Schlörer
- Faculty of Chemistry and Earth Sciences, Friedrich Schiller University, 07743 Jena, Germany
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Herres-Pawlis S, Bach F, Bruno IJ, Chalk SJ, Jung N, Liermann JC, McEwen LR, Neumann S, Steinbeck C, Razum M, Koepler O. Minimum Information Standards in Chemistry: A Call for Better Research Data Management Practices. Angew Chem Int Ed Engl 2022; 61:e202203038. [PMID: 36347644 DOI: 10.1002/anie.202203038] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Indexed: 11/11/2022]
Abstract
Research data management (RDM) is needed to assist experimental advances and data collection in the chemical sciences. Many funders require RDM because experiments are often paid for by taxpayers and the resulting data should be deposited sustainably for posterity. However, paper notebooks are still common in laboratories and research data is often stored in proprietary and/or dead-end file formats without experimental context. Data must mature beyond a mere supplement to a research paper. Electronic lab notebooks (ELN) and laboratory information management systems (LIMS) allow researchers to manage data better and they simplify research and publication. Thus, an agreement is needed on minimum information standards for data handling to support structured approaches to data reporting. As digitalization becomes part of curricular teaching, future generations of digital native chemists will embrace RDM and ELN as an organic part of their research.
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Affiliation(s)
- Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1A, 52074, Aachen, Germany
| | - Felix Bach
- E-Research, FIZ Karlsruhe-Leibniz Institute for Information Infrastructure, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Ian J Bruno
- Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK
| | - Stuart J Chalk
- Department of Chemistry, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA
| | - Nicole Jung
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Johannes C Liermann
- Johannes Gutenberg University Mainz, Department of Chemistry, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Leah R McEwen
- Cornell University Library, 293 Clark Hall, Ithaca, NY 14853-2501, USA
| | - Steffen Neumann
- Bioinformatics and Scientific Data, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120, Halle, Germany
| | - Christoph Steinbeck
- Institute for Inorganic and Analytical Chemistry, Friedrich-Schiller-University Jena, Lessingstr. 1, 07743, Jena, Germany
| | - Matthias Razum
- E-Research, FIZ Karlsruhe-Leibniz Institute for Information Infrastructure, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Oliver Koepler
- Lab Linked Scientific Knowledge, TIB-Leibniz Information Centre for Science and Technology, Welfengarten 1B, 30173, Hannover, Germany
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Herres‐Pawlis S, Bach F, Bruno IJ, Chalk SJ, Jung N, Liermann JC, McEwen LR, Neumann S, Steinbeck C, Razum M, Koepler O. Mindestinformationsstandards in der Chemie: Ein Appell zum besseren Umgang mit Forschungsdaten. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sonja Herres‐Pawlis
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1A 52074 Aachen Deutschland
| | - Felix Bach
- E-Research FIZ Karlsruhe – Leibniz Institute for Information Infrastructure Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Ian J. Bruno
- Cambridge Crystallographic Data Centre 12 Union Road Cambridge CB2 1EZ UK
| | - Stuart J. Chalk
- Department of Chemistry University of North Florida 1 UNF Drive Jacksonville FL 32224 USA
| | - Nicole Jung
- Institute of Biological and Chemical Systems (IBCS) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Johannes C. Liermann
- Johannes Gutenberg University Mainz Department of Chemistry Duesbergweg 10–14 55128 Mainz Deutschland
| | - Leah R. McEwen
- Cornell University Library 293 Clark Hall Ithaca NY 14853-2501 USA
| | - Steffen Neumann
- Bioinformatics and Scientific Data Leibniz Institute of Plant Biochemistry Weinberg 3 06120 Halle Deutschland
| | - Christoph Steinbeck
- Institute for Inorganic and Analytical Chemistry Friedrich-Schiller-University Jena Lessingstr. 1 07743 Jena Deutschland
| | - Matthias Razum
- E-Research FIZ Karlsruhe – Leibniz Institute for Information Infrastructure Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Oliver Koepler
- Lab Linked Scientific Knowledge TIB – Leibniz Information Centre for Science and Technology Welfengarten 1B 30173 Hannover Deutschland
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Oepen K, Özbek H, Schüffler A, Liermann JC, Thines E, Schneider D. Myristic Acid Inhibits the Activity of the Bacterial ABC Transporter BmrA. Int J Mol Sci 2021; 22:ijms222413565. [PMID: 34948362 PMCID: PMC8707315 DOI: 10.3390/ijms222413565] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/07/2021] [Accepted: 12/14/2021] [Indexed: 12/12/2022] Open
Abstract
ATP-binding cassette (ABC) transporters are conserved in all kingdoms of life, where they transport substrates against a concentration gradient across membranes. Some ABC transporters are known to cause multidrug resistances in humans and are able to transport chemotherapeutics across cellular membranes. Similarly, BmrA, the ABC transporter of Bacillus subtilis, is involved in excretion of certain antibiotics out of bacterial cells. Screening of extract libraries isolated from fungi revealed that the C14 fatty acid myristic acid has an inhibitory effect on the BmrA ATPase as well as the transport activity. Thus, a natural membrane constituent inhibits the BmrA activity, a finding with physiological consequences as to the activity and regulation of ABC transporter activities in biological membranes.
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Affiliation(s)
- Kristin Oepen
- Department of Chemistry, Johannes Gutenberg-University, 55128 Mainz, Germany; (K.O.); (J.C.L.)
| | - Hüseyin Özbek
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), 55128 Mainz, Germany; (H.Ö.); (A.S.); (E.T.)
| | - Anja Schüffler
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), 55128 Mainz, Germany; (H.Ö.); (A.S.); (E.T.)
| | - Johannes C. Liermann
- Department of Chemistry, Johannes Gutenberg-University, 55128 Mainz, Germany; (K.O.); (J.C.L.)
| | - Eckhard Thines
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), 55128 Mainz, Germany; (H.Ö.); (A.S.); (E.T.)
- Institute of Molecular Physiology, Johannes Gutenberg-University, 55128 Mainz, Germany
| | - Dirk Schneider
- Department of Chemistry, Johannes Gutenberg-University, 55128 Mainz, Germany; (K.O.); (J.C.L.)
- Institute of Molecular Physiology, Johannes Gutenberg-University, 55128 Mainz, Germany
- Correspondence: ; Tel.: +49-6131-39-25833
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Herres‐Pawlis S, Liermann JC, Koepler O. Cover Feature: Research Data in Chemistry – Results of the first NFDI4Chem Community Survey (Z. Anorg. Allg. Chem. 23‐24/2020). Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202070233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Breising VM, Kayser JM, Kehl A, Schollmeyer D, Liermann JC, Waldvogel SR. Electrochemical formation of N,N′-diarylhydrazines by dehydrogenative N–N homocoupling reaction. Chem Commun (Camb) 2020; 56:4348-4351. [DOI: 10.1039/d0cc01052a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A novel electrochemical access to N,N′-diarylhydrazines is developed using commercial anilines, a simple setup, and an ecologically efficient electrolyte system.
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Affiliation(s)
| | - Jacob M. Kayser
- Department of Chemistry
- Johannes Gutenberg University Mainz
- 55128 Mainz
- Germany
| | - Anton Kehl
- Department of Chemistry
- Johannes Gutenberg University Mainz
- 55128 Mainz
- Germany
| | - Dieter Schollmeyer
- Department of Chemistry
- Johannes Gutenberg University Mainz
- 55128 Mainz
- Germany
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Liermann JC, Schlörer NE. Data handling in NMR facilities and assignment of NMR spectra in synthetic chemistry labs: Why electronic structure validation should become part of the routine. Magn Reson Chem 2018; 56:513-519. [PMID: 29117453 DOI: 10.1002/mrc.4675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 10/06/2017] [Accepted: 10/16/2017] [Indexed: 06/07/2023]
Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Nils E Schlörer
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939, Köln, Germany
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Jacob S, Grötsch T, Foster AJ, Schüffler A, Rieger PH, Sandjo LP, Liermann JC, Opatz T, Thines E. Unravelling the biosynthesis of pyriculol in the rice blast fungus Magnaporthe oryzae. Microbiology (Reading) 2017; 163:541-553. [PMID: 27902426 DOI: 10.1099/mic.0.000396] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Pyriculol was isolated from the rice blast fungus Magnaporthe oryzae and found to induce lesion formation on rice leaves. These findings suggest that it could be involved in virulence. The gene MoPKS19 was identified to encode a polyketide synthase essential for the production of the polyketide pyriculol in the rice blast fungus M. oryzae. The transcript abundance of MoPKS19 correlates with the biosynthesis rate of pyriculol in a time-dependent manner. Furthermore, gene inactivation of MoPKS19 resulted in a mutant unable to produce pyriculol, pyriculariol and their dihydro derivatives. Inactivation of a putative oxidase-encoding gene MoC19OXR1, which was found to be located in the genome close to MoPKS19, resulted in a mutant exclusively producing dihydropyriculol and dihydropyriculariol. By contrast, overexpression of MoC19OXR1 resulted in a mutant strain only producing pyriculol. The MoPKS19 cluster, furthermore, comprises two transcription factors MoC19TRF1 and MoC19TRF2, which were both found individually to act as negative regulators repressing gene expression of MoPKS19. Additionally, extracts of ΔMopks19 and ΔMoC19oxr1 made from axenic cultures failed to induce lesions on rice leaves compared to extracts of the wild-type strain. Consequently, pyriculol and its isomer pyriculariol appear to be the only lesion-inducing secondary metabolites produced by M. oryzae wild-type (MoWT) under these culture conditions. Interestingly, the mutants unable to produce pyriculol and pyriculariol were as pathogenic as MoWT, demonstrating that pyriculol is not required for infection.
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Affiliation(s)
- Stefan Jacob
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
| | - Thomas Grötsch
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
| | - Andrew J Foster
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
| | - Anja Schüffler
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
| | - Patrick H Rieger
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
| | - Louis P Sandjo
- Institute of Organic Chemistry, Johannes Gutenberg University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Johannes C Liermann
- Institute of Organic Chemistry, Johannes Gutenberg University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, Johannes Gutenberg University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Eckhard Thines
- Institut für Mikrobiologie und Weinforschung, Johannes Gutenberg University of Mainz, Johann-Joachim-Becherweg 15, D-55128 Mainz, Germany.,Institut für Biotechnologie und Wirkstoff-Forschung gGmbH (IBWF), Erwin-Schrödinger Str. 56, D-67663 Kaiserslautern, Germany
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Herzberger J, Leibig D, Liermann JC, Frey H. Conventional Oxyanionic versus Monomer-Activated Anionic Copolymerization of Ethylene Oxide with Glycidyl Ethers: Striking Differences in Reactivity Ratios. ACS Macro Lett 2016; 5:1206-1211. [PMID: 35614746 DOI: 10.1021/acsmacrolett.6b00701] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Detailed understanding of the monomer distribution in copolymers is essential to tailor their properties. For the first time, we have been able to utilize in situ 1H NMR spectroscopy to monitor the monomer-activated anionic ring opening copolymerization (AROP) of ethylene oxide (EO) with a glycidyl ether comonomer, namely, ethoxy ethyl glycidyl ether (EEGE). We determine reactivity ratios and draw a direct comparison to conventional oxyanionic ROP. Surprisingly, the respective monomer reactivities differ strongly between the different types of AROP. Under conventional oxyanionic conditions similar monomer reactivities of EO and EEGE are observed, leading to random structures (rEO = 1.05 ± 0.02, rEEGE = 0.94 ± 0.02). Addition of a cation complexing agent (18-crown-6) showed no influence on the relative reactivity of EO and EEGE (rEO = rEEGE = 1.00 ± 0.02). In striking contrast, monomer-activated AROP produces very different monomer reactivities, affording strongly tapered copolymer structures (rEO = 8.00 ± 0.16, rEEGE = 0.125 ± 0.003). These results highlight the importance of understanding reactivity ratios of comonomer pairs under certain polymerization conditions, at the same time demonstrating the ability to generate both random and strongly tapered P(EO-co-EEGE) polyethers by simple one-pot statistical anionic copolymerization. These observations may be generally valid for the copolymerization of EO and glycidyl ethers.
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Affiliation(s)
- Jana Herzberger
- Institute
of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg
10-14, D-55128 Mainz, Germany
- Graduate School
Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz, Germany
| | - Daniel Leibig
- Institute
of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg
10-14, D-55128 Mainz, Germany
- Graduate School
Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz, Germany
| | - Johannes C. Liermann
- Institute
of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg
10-14, D-55128 Mainz, Germany
| | - Holger Frey
- Institute
of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg
10-14, D-55128 Mainz, Germany
- Graduate School
Materials Science in Mainz, Staudingerweg 9, D-55128 Mainz, Germany
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Andernach L, Sandjo LP, Liermann JC, Schlämann R, Richter C, Ferner JP, Schwalbe H, Schüffler A, Thines E, Opatz T. Terphenyl Derivatives from Allantophomopsis lycopodina. J Nat Prod 2016; 79:2718-2725. [PMID: 27731998 DOI: 10.1021/acs.jnatprod.6b00690] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three secondary fungal metabolites 1-3 with a benzo[b]naphtho[2,1-d]furan skeleton were isolated from submerged cultures of the ascomycete Allantophomopsis lycopodina. The NMR-based structure elucidation was challenging due to a low H/C ratio of only 0.64 and 0.68, respectively. NMR measurements in two different solvents and the use of NMR experiments such as HSQC-TOCSY and LR-HSQMBC proved to be helpful in this respect. The proposed structures obtained from the comprehensive analysis of the NMR data were verified by comparison of recorded and computed NMR chemical shifts from quantum chemical calculations of several constitutional isomers and were further analyzed with the aid of the DP4 and DP4+ probabilities.
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Affiliation(s)
- Lars Andernach
- Institute of Organic Chemistry, Johannes Gutenberg-University , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Louis P Sandjo
- Institute of Organic Chemistry, Johannes Gutenberg-University , Duesbergweg 10-14, D-55128 Mainz, Germany
- Departamento de Ciências Farmacêuticas, Centro de Ciências da Saúde, Bloco J/K, Universidade Federal de Santa Catarina , Florianópolis 88040-900, SC, Brazil
| | - Johannes C Liermann
- Institute of Organic Chemistry, Johannes Gutenberg-University , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Ricardo Schlämann
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH , Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
| | - Christian Richter
- Institute of Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe-University Frankfurt , Max-von-Laue-Straße 7, D-60438 Frankfurt am Main, Germany
| | - Jan-Peter Ferner
- Institute of Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe-University Frankfurt , Max-von-Laue-Straße 7, D-60438 Frankfurt am Main, Germany
| | - Harald Schwalbe
- Institute of Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance, Johann Wolfgang Goethe-University Frankfurt , Max-von-Laue-Straße 7, D-60438 Frankfurt am Main, Germany
| | - Anja Schüffler
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH , Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
| | - Eckhard Thines
- Institut für Biotechnologie und Wirkstoff-Forschung gGmbH , Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany
- Institut für Mikrobiologie und Weinforschung, Johannes Gutenberg-University Mainz , Johann-Joachim-Becherweg 15, 55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, Johannes Gutenberg-University , Duesbergweg 10-14, D-55128 Mainz, Germany
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Leibig D, Seiwert J, Liermann JC, Frey H. Copolymerization Kinetics of Glycidol and Ethylene Oxide, Propylene Oxide, and 1,2-Butylene Oxide: From Hyperbranched to Multiarm Star Topology. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01477] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Daniel Leibig
- Institute
of Organic Chemistry, Johannes Gutenberg University, Duesbergweg
10-14, 55128 Mainz, Germany
- Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
| | - Jan Seiwert
- Institute
of Organic Chemistry, Johannes Gutenberg University, Duesbergweg
10-14, 55128 Mainz, Germany
| | - Johannes C. Liermann
- Institute
of Organic Chemistry, Johannes Gutenberg University, Duesbergweg
10-14, 55128 Mainz, Germany
| | - Holger Frey
- Institute
of Organic Chemistry, Johannes Gutenberg University, Duesbergweg
10-14, 55128 Mainz, Germany
- Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
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Abstract
Bioactivity-guided fractionation of extracts from the fungus IBWF79B-90A resulted in the isolation of three known naphthoquinones, herbarin, dehydroherbarin, and O-methylherbarin and the azaanthraquinone scorpinone as well as three structurally related derivatives, O-phenethylherbarin and herbaridines A and B. All seven compounds exhibited cytotoxic activities against several cell lines.
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Affiliation(s)
- Anja Schüffler
- University of Kaiserslautern, Paul-Ehrlich-Str. 23, D-67663 Kaiserslautern, Germany
| | - Johannes C. Liermann
- Institute of Organic Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
| | - Heinz Kolshorn
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10 – 14, D-55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
| | - Heidrun Anke
- Institute of Biotechnology and Drug Research, Erwin-Schrödinger-Str. 56, D-67663 Kaiserslautern, Germany
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Schüffler A, Liermann JC, Kolshorn H, Opatz T, Anke T. New Caloporoside Derivatives and their Inhibition of Fungal Spore Germination. ACTA ACUST UNITED AC 2014; 64:521-5. [DOI: 10.1515/znc-2009-7-810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In our ongoing screening culture fluid extracts of Gloeoporus (Caloporus) dichrous strain 83065 inhibited the germination of Magnaporthe grisea and Fusarium graminearum spores. While isolating the active metabolites two new caloporosides, caloporoside G and caloporoside H, in addition to the known caloporoside derivatives F-16438G, caloporoside A, and 2-hydroxy-6-(16-hydroxyheptadecyl)benzoic acid were obtained.
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Affiliation(s)
- Anja Schüffler
- University of Kaiserslautern, Paul-Ehrlich-Str. 23, D-67663 Kaiserslautern, Germany
| | - Johannes C. Liermann
- Institute of Organic Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
| | - Heinz Kolshorn
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10 – 14, D-55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
| | - Timm Anke
- Institute of Biotechnology and Drug Research, Erwin-Schrödinger-Str. 56, D-67663 Kaiserslautern, Germany
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Abstract
Anthranicine, a cyclic hexapeptide containing anthranilic acid and pipecolic acid, was isolated from a mycophilic Acremonium species. The structure and stereochemistry of the compound featuring two D-configurated amino acids are discussed.
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Affiliation(s)
- Johannes C. Liermann
- Universitat Hamburg, Institut fur Organische Chemie, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
| | - Eckhard Thines
- Institut fur Biotechnologie und Wirkstoff-Forschung (IBWF), Erwin-Schrodinger-Str. 56, D-67663 Kaiserslautern, Germany
| | - Heidrun Anke
- Institut fur Biotechnologie und Wirkstoff-Forschung (IBWF), Erwin-Schrodinger-Str. 56, D-67663 Kaiserslautern, Germany
| | - Till Opatz
- Universitat Hamburg, Institut fur Organische Chemie, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
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Nantchouang Ouete JL, Sandjo LP, Kapche DWFG, Liermann JC, Opatz T, Simo IK, Ngadjui BT. A New Flavone from the Roots of Milicia excelsa (Moraceae). Z NATURFORSCH C 2014. [DOI: 10.1515/znc-2013-7-801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A new flavonoid identified as 2-(2,4-dihydroxyphenyl)-5-hydroxy-8,8-dimethyl-4H,8Hpyrano[ 2,3-f]chromen-4-one (2’-hydroxyatalantoflavone) (1) was obtained from the roots of Milicia excelsa along with five known compounds including atalantoflavone (2), neocyclomorusin (3), 6-geranylnorartocarpetin (4), cudraxanthone I (5), and betulinic acid (6). The structures of the isolates were established on the basis of their spectral data and by comparison with those reported in the literature
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Affiliation(s)
| | - Louis P. Sandjo
- Johannes Gutenberg-Universität Mainz, Institute of Organic Chemistry, Duesbergweg 10 – 14, D-55128 Mainz, Germany
| | - Deccaux W. F. G. Kapche
- Department of Chemistry, Higher Teacher’s Training College, University of Yaoundé I, P. O. Box 47, Yaoundé, Cameroon
| | - Johannes C. Liermann
- Johannes Gutenberg-Universität Mainz, Institute of Organic Chemistry, Duesbergweg 10 – 14, D-55128 Mainz, Germany
| | - Till Opatz
- Johannes Gutenberg-Universität Mainz, Institute of Organic Chemistry, Duesbergweg 10 – 14, D-55128 Mainz, Germany
| | - Ingrid K. Simo
- Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
| | - Bonaventure T. Ngadjui
- Department of Organic Chemistry, University of Yaoundé I, P. O. Box 812, Yaoundé, Cameroon
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Andernach L, Sandjo LP, Liermann JC, Buckel I, Thines E, Opatz T. Assignment of Configuration in a Series of Dioxolanone-Type Secondary Metabolites fromGuignardia bidwellii- A Comparison of VCD and ECD Spectroscopy. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300530] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ouete JLN, Sandjo LP, Kapche DWFG, Liermann JC, Opatz T, Simo IK, Ngadjui BT. A new flavone from the roots of Milicia excelsa (Moraceae). Z NATURFORSCH C 2013; 68:259-263. [PMID: 24066509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A new flavonoid identified as 2-(2,4-dihydroxyphenyl)-5-hydroxy-8,8-dimethyl-4H,8H-pyrano[2,3-f]chromen-4-one (2'-hydroxyatalantoflavone) (1) was obtained from the roots of Milicia excelsa along with five known compounds including atalantoflavone (2), neocyclomorusin (3), 6-geranylnorartocarpetin (4), cudraxanthone I (5), and betulinic acid (6). The structures of the isolates were established on the basis of their spectral data and by comparison with those reported in the literature.
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Buckel I, Molitor D, Liermann JC, Sandjo LP, Berkelmann-Löhnertz B, Opatz T, Thines E. Phytotoxic dioxolanone-type secondary metabolites from Guignardia bidwellii. Phytochemistry 2013; 89:96-103. [PMID: 23406659 DOI: 10.1016/j.phytochem.2013.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 01/14/2013] [Accepted: 01/15/2013] [Indexed: 06/01/2023]
Abstract
Phenguignardic acid was recently described as a phytotoxic secondary metabolite from submerged cultures of the grape black rot fungus Guignardia bidwellii. Since the production rate of this natural product in submerged culture is very low, fermentation optimisation was carried out. The optimisation of cultivation conditions led to the identification of seven secondary metabolites, structurally related to guignardic acid, a known secondary metabolite from Guignardia species containing a dioxolanone moiety. All metabolites presented here have not been described to date and are presumably biosynthesised via deamination products of amino acids, such as phenylalanine, valine, tyrosine, and alanine. Four of the seven compounds showed phytotoxic activity. Based on the structures determined by NMR spectroscopy a preliminary structure activity relationship indicated a free carboxyl group as presumably required for the phytotoxic activity.
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Affiliation(s)
- Iris Buckel
- Institute of Biotechnology and Drug Research, Erwin-Schrödinger-Strasse 56, D-67663 Kaiserslautern, Germany.
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Liermann JC, Elnagdi MH, Meier H. Unambiguous structure elucidation of heterocyclic products from condensation-cyclisation reactions of enaminones by 2D INADEQUATE and 15N NMR. Magn Reson Chem 2013; 51:16-18. [PMID: 23132629 DOI: 10.1002/mrc.3897] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 10/06/2012] [Accepted: 10/11/2012] [Indexed: 06/01/2023]
Abstract
The reaction of enaminones with 3-amino-2-cyanopent-2-enedinitrile can lead to an array of 12 possible products, depending on the reaction pathway and tautomerization. The use of 2D INADEQUATE and (15)N NMR for the unambiguous structure elucidation of the reaction products is discussed in this manuscript.
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Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128, Mainz, Germany.
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21
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Ouete JLN, Sandjo LP, Kapche DWFG, Liermann JC, Opatz T, Simo IK, Ngadjui BT. A New Flavone from the Roots of Milicia excelsa (Moraceae). Z NATURFORSCH C 2013. [DOI: 10.5560/znc.2013.68c0259] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Liermann JC, Thines E, Opatz T, Anke H. Drimane sesquiterpenoids from Marasmius sp. inhibiting the conidial germination of plant-pathogenic fungi. J Nat Prod 2012; 75:1983-1986. [PMID: 23088156 DOI: 10.1021/np300337w] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
From the basidiomycete Marasmius sp., strain IBWF 96046, three new sesquiterpenoids based on the drimane skeleton were isolated and named marasmene B and marasmals B and C. In this study, their isolation, structure elucidation, and biological evaluation are described. The compounds have a pronounced inhibitory effect on the conidial germination of several plant-pathogenic fungi.
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Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz , 55128 Mainz, Germany
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Schüffler A, Wollinsky B, Anke T, Liermann JC, Opatz T. Isolactarane and sterpurane sesquiterpenoids from the basidiomycete Phlebia uda. J Nat Prod 2012; 75:1405-8. [PMID: 22746380 DOI: 10.1021/np3000552] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Three new sesquiterpenoids, named udasterpurenol A, udalactarane A, and udalactarane B, as well as the known compounds hyphodontal and sterpuric acid have been isolated from the basidiomycete Phlebia uda. These compounds represent the first natural products described from this species. The structures were elucidated by NMR spectroscopy and mass spectrometry. Udalactaranes A and B were isolated as mixtures with their respective epimeric acetals. These mixtures inhibited the spore germination of the plant pathogenic fungus Fusarium graminearum at 10 and 5 μg/mL, respectively, and were active against Jurkat cells with IC(50) values of 101 and 42 μM, respectively.
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Affiliation(s)
- Anja Schüffler
- Institute of Biotechnology and Drug Research (IBWF), Erwin-Schrödinger-Strasse 56, 67663 Kaiserslautern, Germany
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Molitor D, Liermann JC, Berkelmann-Löhnertz B, Buckel I, Opatz T, Thines E. Phenguignardic acid and guignardic acid, phytotoxic secondary metabolites from Guignardia bidwellii. J Nat Prod 2012; 75:1265-1269. [PMID: 22779915 DOI: 10.1021/np2008945] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Bioactivity-guided isolation led to the identification of phenguignardic acid (2), a new phytotoxic secondary metabolite from submerged cultures of grape black rot fungus, Guignardia bidwellii. The compound is structurally related to guignardic acid (1), a dioxolanone moiety-containing metabolite isolated previously from Guignardia species. However, in contrast to guignardic acid, which is presumably synthesized from deamination products of valine and phenylalanine, the biochemical precursor for the biosynthesis of the new phytotoxin appears to be exclusively phenylalanine. Guignardic acid was also found in extracts of cultures from Guignardia bidwellii. The phytotoxic activities of both compounds were assessed in plant assays using either detached vine leaves or intact plants. Antimicrobial and cytotoxic activities of phenguignardic acid were determined.
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Affiliation(s)
- Daniel Molitor
- Department Environment and Agro-Biotechnologies, Centre de Recherche Public-Gabriel Lippmann , 41 Rue du Brill, L-4422 Belvaux, Luxembourg
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Djoumessi AV, Sandjo LP, Liermann JC, Schollmeyer D, Kuete V, Rincheval V, Berhanu AM, Yeboah SO, Wafo P, Ngadjui BT, Opatz T. Donellanic acids A–C: new cyclopropanic oleanane derivatives from Donella ubanguiensis (Sapotaceae). Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.04.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Abstract
CXCL10 (inducible protein-10) is a highly inducible chemoattractant, which contributes to the recruitment of inflammatory cells, such as macrophages and T-lymphocytes, and thereby has important roles in chronic inflammatory conditions. In a search for new inhibitors of CXCL10 expression in MonoMac6 cells, a novel compound, designated as Ganodermycin, was isolated from fermentations of the basidiomycete Ganoderma applanatum. The structure was determined by a combination of spectroscopic techniques. Ganodermycin inhibited the lipopolysaccharide (LPS)/interferon (IFN)-γ-induced CXCL10 promoter activity in transiently transfected MonoMac6 cells in a dose-dependent manner with IC(50) values of 15-20 μg ml(-1) (53-71 μM). Ganodermycin also reduced LPS/IFN-γ-induced CXCL10 protein synthesis and excretion.
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Affiliation(s)
- Mathias Jung
- Institute of Biotechnology and Drug Research (IBWF), Kaiserslautern, Germany
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Schüffler A, Liermann JC, Opatz T, Anke T. Elucidation of the Biosynthesis and Degradation of Allantofuranone by Isotopic Labelling and Fermentation of Modified Precursors. Chembiochem 2010; 12:148-54. [DOI: 10.1002/cbic.201000448] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Liermann JC, Schüffler A, Wollinsky B, Birnbacher J, Kolshorn H, Anke T, Opatz T. Hirsutane-type sesquiterpenes with uncommon modifications from three basidiomycetes. J Org Chem 2010; 75:2955-61. [PMID: 20345148 DOI: 10.1021/jo100202b] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
From three basidiomycetes, Xeromphalina sp., Stereum sp., and Pleurocybella porrigens, six triquinane sesquiterpenes with unprecendented modifications and a rearranged sesquiterpene related to coriolin C have been isolated. Their isolation, structure elucidation, and biological evaluation are described.
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Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
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Götz K, Liermann JC, Thines E, Anke H, Opatz T. Structure elucidation of hypocreolide A by enantioselective total synthesis. Org Biomol Chem 2010; 8:2123-30. [DOI: 10.1039/c001794a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Horbach R, Graf A, Weihmann F, Antelo L, Mathea S, Liermann JC, Opatz T, Thines E, Aguirre J, Deising HB. Sfp-type 4'-phosphopantetheinyl transferase is indispensable for fungal pathogenicity. Plant Cell 2009; 21:3379-96. [PMID: 19880801 PMCID: PMC2782280 DOI: 10.1105/tpc.108.064188] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 08/27/2009] [Accepted: 10/05/2009] [Indexed: 05/20/2023]
Abstract
In filamentous fungi, Sfp-type 4'-phosphopantetheinyl transferases (PPTases) activate enzymes involved in primary (alpha-aminoadipate reductase [AAR]) and secondary (polyketide synthases and nonribosomal peptide synthetases) metabolism. We cloned the PPTase gene PPT1 of the maize anthracnose fungus Colletotrichum graminicola and generated PPTase-deficient mutants (Deltappt1). Deltappt1 strains were auxotrophic for Lys, unable to synthesize siderophores, hypersensitive to reactive oxygen species, and unable to synthesize polyketides (PKs). A differential analysis of secondary metabolites produced by wild-type and Deltappt1 strains led to the identification of six novel PKs. Infection-related morphogenesis was affected in Deltappt1 strains. Rarely formed appressoria of Deltappt1 strains were nonmelanized and ruptured on intact plant. The hyphae of Deltappt1 strains colonized wounded maize (Zea mays) leaves but failed to generate necrotic anthracnose disease symptoms and were defective in asexual sporulation. To analyze the pleiotropic pathogenicity phenotype, we generated AAR-deficient mutants (Deltaaar1) and employed a melanin-deficient mutant (M1.502). Results indicated that PPT1 activates enzymes required at defined stages of infection. Melanization is required for cell wall rigidity and appressorium function, and Lys supplied by the AAR1 pathway is essential for necrotrophic development. As PPTase-deficient mutants of Magnaporthe oryzea were also nonpathogenic, we conclude that PPTases represent a novel fungal pathogenicity factor.
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Affiliation(s)
- Ralf Horbach
- Martin-Luther-Universität Halle-Wittenberg, Naturwissenschaftliche Fakultät III, Institut für Agrar und Ernährungswissenschaften, Phytopathologie und Pflanzenschutz, D-06099 Halle (Saale), Germany
| | - Alexander Graf
- Martin-Luther-Universität Halle-Wittenberg, Naturwissenschaftliche Fakultät III, Institut für Agrar und Ernährungswissenschaften, Phytopathologie und Pflanzenschutz, D-06099 Halle (Saale), Germany
| | - Fabian Weihmann
- Martin-Luther-Universität Halle-Wittenberg, Naturwissenschaftliche Fakultät III, Institut für Agrar und Ernährungswissenschaften, Phytopathologie und Pflanzenschutz, D-06099 Halle (Saale), Germany
| | - Luis Antelo
- Institut für Biotechnologie und Wirkstoff-Forschung, D-67663 Kaiserslautern, Germany
| | - Sebastian Mathea
- Max-Planck-Forschungsstelle für Enzymologie der Proteinfaltung, D-06120 Halle (Saale), Germany
| | | | - Till Opatz
- Institut für Organische Chemie, Universität Hamburg, D-20146 Hamburg, Germany
| | - Eckhard Thines
- Institut für Biotechnologie und Wirkstoff-Forschung, D-67663 Kaiserslautern, Germany
| | - Jesús Aguirre
- Instituto de Fisiología Celular,Universidad Nacional Autónoma de México, 04510 Mexico, D.F., Mexico
| | - Holger B. Deising
- Martin-Luther-Universität Halle-Wittenberg, Naturwissenschaftliche Fakultät III, Institut für Agrar und Ernährungswissenschaften, Phytopathologie und Pflanzenschutz, D-06099 Halle (Saale), Germany
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Liermann JC, Kolshorn H, Opatz T, Thines E, Anke H. Xanthepinone, an antimicrobial polyketide from a soil fungus closely related to Phoma medicaginis. J Nat Prod 2009; 72:1905-1907. [PMID: 19795903 DOI: 10.1021/np9005234] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The isolation, biological characterization, and structure elucidation of xanthepinone, a novel antifungal metabolite isolated from the broth of submerged cultures of a soil fungus, are described. Xanthepinone inhibits the conidial germination of Magnaporthe grisea (2 microg/mL), Phytophthora infestans (5 microg/mL), and Botrytis cinerea (10 microg/mL) while showing only weak antibacterial activity; cytotoxicity was not observed up to 50 microg/mL. Molecular taxonomy revealed that the producing strain is close to species in the genus Phoma as well as to uncultured soil fungi and endophytes.
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Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
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Liermann JC, Opatz T, Kolshorn H, Antelo L, Hof C, Anke H. ChemInform Abstract: Omphalotins E-I, Five Oxidatively Modified Nematicidal Cyclopeptides from Omphalotus olearius. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/chin.200925186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schüffler A, Kautz D, Liermann JC, Opatz T, Anke T. Allantofuranone, a new antifungal antibiotic from Allantophomopsis lycopodina IBWF58B-05A. J Antibiot (Tokyo) 2009; 62:119-21. [DOI: 10.1038/ja.2008.21] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Cultures of the ascomycete Dasyscyphus niveus have yielded two new tetracyclic dasyscyphin-type terpenoids (1 and 2), and their structures were elucidated by NMR spectroscopy and X-ray crystallography. The absolute configuration of dasyscyphin D (1) was determined by synthesis and NMR spectroscopy of diastereomeric MTPA esters. Both compounds inhibited the germination of conidia of Magnaporthe grisea at 25 microg/mL.
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Affiliation(s)
- Johannes C Liermann
- Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany
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Liermann JC, Opatz T. Synthesis of lamellarin U and lamellarin G trimethyl ether by alkylation of a deprotonated alpha-aminonitrile. J Org Chem 2008; 73:4526-31. [PMID: 18500839 DOI: 10.1021/jo800467e] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
1,2,3,4-Tetrahydroisoquinoline-1-carbonitriles can serve as starting materials for the one-pot synthesis of 5,6-dihydropyrrolo[2,1 a]isoquinolines and 1-benzyl-3,4-dihydroisoquinolines. The latter compounds were transformed to lamellarin G trimethyl ether and lamellarin U in short reaction sequences. This method allows the introduction of acid-sensitive protecting groups for the phenolic hydroxy functions which would be cleaved under the harsh conditions of the classical Bischler-Napieralski reaction.
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