1
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Tian J, Liu J, Knapp M, Donnan PH, Boggs DG, Bridwell-Rabb J. Custom tuning of Rieske oxygenase reactivity. Nat Commun 2023; 14:5858. [PMID: 37730711 PMCID: PMC10511449 DOI: 10.1038/s41467-023-41428-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 08/27/2023] [Indexed: 09/22/2023] Open
Abstract
Rieske oxygenases use a Rieske-type [2Fe-2S] cluster and a mononuclear iron center to initiate a range of chemical transformations. However, few details exist regarding how this catalytic scaffold can be predictively tuned to catalyze divergent reactions. Therefore, in this work, using a combination of structural analyses, as well as substrate and rational protein-based engineering campaigns, we elucidate the architectural trends that govern catalytic outcome in the Rieske monooxygenase TsaM. We identify structural features that permit a substrate to be functionalized by TsaM and pinpoint active-site residues that can be targeted to manipulate reactivity. Exploiting these findings allowed for custom tuning of TsaM reactivity: substrates are identified that support divergent TsaM-catalyzed reactions and variants are created that exclusively catalyze dioxygenation or sequential monooxygenation chemistry. Importantly, we further leverage these trends to tune the reactivity of additional monooxygenase and dioxygenase enzymes, and thereby provide strategies to custom tune Rieske oxygenase reaction outcomes.
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Affiliation(s)
- Jiayi Tian
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jianxin Liu
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Madison Knapp
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Patrick H Donnan
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - David G Boggs
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
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2
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Qu W, Kithsiri Wijeratne EM, Bashyal BP, Xu J, Xu YM, Liu MX, Inácio MC, Arnold AE, U'Ren JM, Leslie Gunatilaka AA. Strobiloscyphones A-F, 6-Isopentylsphaeropsidones and Other Metabolites from Strobiloscypha sp. AZ0266, a Leaf-Associated Fungus of Douglas Fir. JOURNAL OF NATURAL PRODUCTS 2021; 84:2575-2586. [PMID: 34495663 DOI: 10.1021/acs.jnatprod.1c00662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Six new 6-isopentylsphaeropsidones, strobiloscyphones A-F (1-6), and a new hexadecanoic acid, (2Z,4E,6E)-8,9-dihydroxy-10-oxohexadeca-2,4,6-trienoic acid (7), together with sphaeropsidone (8) and its known synthetic analogue 5-dehydrosphaeropsidone (9) were isolated from Strobiloscypha sp. AZ0266, a fungus inhabiting the leaf litter of Douglas fir (Pseudotsuga menziesii). The structures of 1-7 were established on the basis of their high-resolution mass and 1D and 2D NMR spectroscopic data, and their relative and/or absolute configurations were determined by NOE, comparison of experimental and calculated ECD spectra, and application of the modified Mosher's ester method. Of these, strobiloscyphone F (6) contains a novel highly oxygenated tetracyclic oxireno-octahydrodibenzofuran ring system. Natural products 1, 6, and 9 and the semisynthetic analogue 12 derived from 8 exhibited cytotoxic activity, whereas 9 and 12 showed antimicrobial activity. Possible biosynthetic pathways to 1-6, 8, and 9 are proposed.
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Affiliation(s)
- Wei Qu
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, People's Republic of China
| | - E M Kithsiri Wijeratne
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
| | - Bharat P Bashyal
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
| | - Jian Xu
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, 639 Longmian Avenue, Nanjing 211198, People's Republic of China
| | - Ya-Ming Xu
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
| | - Manping X Liu
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
| | - Marielle C Inácio
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
| | - A Elizabeth Arnold
- School of Plant Sciences, College of Agriculture and Life Sciences, University of Arizona, Tucson, Arizona 85721, United States
| | - Jana M U'Ren
- Biosystems Engineering, College of Agriculture and Life Sciences, University of Arizona, Tucson, Arizona 85721, United States
| | - A A Leslie Gunatilaka
- Southwest Center for Natural Products Research, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706, United States
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3
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Tafelska-Kaczmarek A, Kołodziejska R, Kwit M, Stasiak B, Wypij M, Golińska P. Synthesis, Absolute Configuration, Antibacterial, and Antifungal Activities of Novel Benzofuryl β-Amino Alcohols. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4080. [PMID: 32937873 PMCID: PMC7560283 DOI: 10.3390/ma13184080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/07/2020] [Accepted: 09/09/2020] [Indexed: 12/29/2022]
Abstract
A series of new benzofuryl α-azole ketones was synthesized and reduced by asymmetric transfer hydrogenation (ATH). Novel benzofuryl β-amino alcohols bearing an imidazolyl and triazolyl substituents were obtained with excellent enantioselectivity (96-99%). The absolute configuration (R) of the products was confirmed by means of electronic circular dichroism (ECD) spectroscopy supported by theoretical calculations. Selected benzofuryl α-azole ketones were also successfully asymmetrically bioreduced by fungi of Saccharomyces cerevisiae and Aureobasidium pullulans species. Racemic and chiral β-amino alcohols, as well as benzofuryl α-amino and α-bromo ketones were evaluated for their antibacterial and antifungal activities. From among the synthesized β-amino alcohols, the highest antimicrobial activity was found for (R)-1-(3,5-dimethylbenzofuran-2-yl)-2-(1H-imidazol-1-yl)ethan-1-ol against S. aureus ATCC 25923 (MIC = 64, MBC = 96 μg mL-1) and (R)-1-(3,5-dimethylbenzofuran-2-yl)-2-(1H-1,2,4-triazol-1-yl)ethan-1-ol against yeasts of M. furfur DSM 6170 (MIC = MBC = 64 μg mL-1). In turn, from among the tested ketones, 1-(benzofuran-2-yl)-2-bromoethanones (1-4) were found to be the most active against M. furfur DSM 6170 (MIC = MBC = 1.5 μg mL-1) (MIC-minimal inhibitory concentration, MBC-minimal biocidal concentration).
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Affiliation(s)
- Agnieszka Tafelska-Kaczmarek
- Department of Organic Chemistry, Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Street, 87-100 Toruń, Poland
| | - Renata Kołodziejska
- Department of Medical Biology and Biochemistry, Faculty of Medicine, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, 24 Karłowicz Street, 85-092 Bydgoszcz, Poland;
| | - Marcin Kwit
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznańskiego Street, 61-614 Poznań, Poland; (M.K.); (B.S.)
| | - Bartosz Stasiak
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznańskiego Street, 61-614 Poznań, Poland; (M.K.); (B.S.)
| | - Magdalena Wypij
- Department of Microbiology, Faculty of Biology and Veterinary Sciences, Nicolaus Copernicus University in Toruń, 1 Lwowska Street, 87-100 Toruń, Poland; (M.W.); (P.G.)
| | - Patrycja Golińska
- Department of Microbiology, Faculty of Biology and Veterinary Sciences, Nicolaus Copernicus University in Toruń, 1 Lwowska Street, 87-100 Toruń, Poland; (M.W.); (P.G.)
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4
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Osadchuk I, Borovkov V, Aav R, Clot E. Benchmarking computational methods and influence of guest conformation on chirogenesis in zinc porphyrin complexes. Phys Chem Chem Phys 2020; 22:11025-11037. [DOI: 10.1039/d0cp00965b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different computational methods and influence of the guest conformation and solvent effect to analyze chirogenesis in zinc porphyrins by several chiral compounds have been investigated.
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Affiliation(s)
- Irina Osadchuk
- Department of Chemistry and Biotechnology
- Tallinn University of Technology
- Tallinn 12618
- Estonia
- ICGM, University of Montpellier
| | - Victor Borovkov
- Department of Chemistry and Biotechnology
- Tallinn University of Technology
- Tallinn 12618
- Estonia
- College of Chemistry and Materials Science
| | - Riina Aav
- Department of Chemistry and Biotechnology
- Tallinn University of Technology
- Tallinn 12618
- Estonia
| | - Eric Clot
- ICGM, University of Montpellier
- CNRS
- ENSCM
- Montpellier
- France
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5
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Lyu F, Xu X, Zhang L. Natural polysaccharides with different conformations: extraction, structure and anti-tumor activity. J Mater Chem B 2020; 8:9652-9667. [DOI: 10.1039/d0tb01713b] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Natural polysaccharides as sustainable polymers are rich sources with good biological safety and various biological functions, which are important research topics in the fields of food and medicine.
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Affiliation(s)
- Fengzhi Lyu
- College of Chemistry and Molecular Sciences
- Wuhan 430072
- China
| | - Xiaojuan Xu
- College of Chemistry and Molecular Sciences
- Wuhan 430072
- China
| | - Lina Zhang
- College of Chemistry and Molecular Sciences
- Wuhan 430072
- China
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6
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Prusinowska N, Czapik A, Wojciechowska M, Kwit M. Dynamic optical activity induction in the N-alkyl-N'-trityl ureas and thioureas. Org Biomol Chem 2019; 17:7782-7793. [PMID: 31402354 DOI: 10.1039/c9ob01319a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Considered to be rigid, the urea and thiourea functionalities, often used in material chemistry and in asymmetric organocatalysis, are able to transmit information regarding 3D structure from a permanently chiral inducer part to a dynamically chiral (reporter) part of the molecule. Despite a considerable distance between the inducer and the reporter parts of the molecule, the chirality transfer phenomenon has been demonstrated for a series of secondary N-alkyl-N'-trityl ureas and thioureas. The induction of helicity in a stereodynamic trityl propeller is revealed by rising non-zero Cotton effects in the area of trityl absorption. The information regarding the 3D structure of the inducer is transferred to the reporter part of the system through a set of weak but complementary electrostatic interactions. The presence of two supramolecular motifs in the same molecule, characterized by opposite properties, significantly affected the molecular solid state structure of the thioureas and their abilities to assemble. In the crystalline phase, the model, a chiral N-tert-butyl-thiourea derivative that retains the extended Z,Z conformation of the linker, is prone to form a supramolecular network typical of secondary ureas and thioureas. In contrast, the presence of the hydrophobic trityl group suppresses the thioamide NHS[double bond, length as m-dash]C hydrogen bonds. Therefore, trityl acts as a supramolecular protecting group for thioamide functionality, hampering the formation of hydrogen bonded networks in the solid state.
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Affiliation(s)
- Natalia Prusinowska
- Department of Chemistry Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61 614 Poznań, Poland. and Centre for Advanced Technologies Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61 614 Poznań, Poland.
| | - Agnieszka Czapik
- Department of Chemistry Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61 614 Poznań, Poland. and Centre for Advanced Technologies Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61 614 Poznań, Poland.
| | - Martika Wojciechowska
- Department of Chemistry Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61 614 Poznań, Poland.
| | - Marcin Kwit
- Department of Chemistry Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61 614 Poznań, Poland. and Centre for Advanced Technologies Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, 61 614 Poznań, Poland.
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7
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Zgorzelak M, Grajewski J, Gawroński J, Kwit M. Solvent-assisted synthesis of a shape-persistent chiral polyaza gigantocycle characterized by a very large internal cavity and extraordinarily high amplitude of the ECD exciton couplet. Chem Commun (Camb) 2019; 55:2301-2304. [DOI: 10.1039/c8cc10184a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A giant, chiral square-shaped macrocycle, characterized by a large hydrophobic cavity, has been obtained from readily available and inexpensive substrates.
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Affiliation(s)
- Mikołaj Zgorzelak
- Department of Chemistry, Adam Mickiewicz University
- 61 614 Poznań
- Poland
| | - Jakub Grajewski
- Department of Chemistry, Adam Mickiewicz University
- 61 614 Poznań
- Poland
| | - Jacek Gawroński
- Department of Chemistry, Adam Mickiewicz University
- 61 614 Poznań
- Poland
| | - Marcin Kwit
- Department of Chemistry, Adam Mickiewicz University
- 61 614 Poznań
- Poland
- Centre for Advanced Technologies, Adam Mickiewicz University
- 61 614 Poznań
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8
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Petryk M, Janiak A, Barbour LJ, Kwit M. Awkwardly-Shaped Dimers, Capsules and Tetramers: Molecular and Supramolecular Motifs in C5-Arylated Chiral Calixsalens. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Małgorzata Petryk
- Department of Chemistry; Adam Mickiewicz University; Umultowska 89B 61 614 Poznan Poland
- Center for Advanced Technologies, AMU; Umultowska 89C 61 614 Poznan Poland
| | - Agnieszka Janiak
- Department of Chemistry; Adam Mickiewicz University; Umultowska 89B 61 614 Poznan Poland
- Department of Chemistry and Polymer Science; University of Stellenbosch; 7602 Stellenbosch South Africa
| | - Leonard J. Barbour
- Department of Chemistry and Polymer Science; University of Stellenbosch; 7602 Stellenbosch South Africa
| | - Marcin Kwit
- Department of Chemistry; Adam Mickiewicz University; Umultowska 89B 61 614 Poznan Poland
- Center for Advanced Technologies, AMU; Umultowska 89C 61 614 Poznan Poland
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9
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Boyd DR, Sharma ND, McIntyre PBA, Stevenson PJ, McRoberts WC, Gohil A, Hoering P, Allen CCR. Enzyme-Catalysed Synthesis of Cyclohex-2-en-1-onecis-Diols from Substituted Phenols, Anilines and Derived 4-Hydroxycyclohex-2-en-1-ones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700711] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Derek R. Boyd
- School of Chemistry and Chemical Engineering; Queen's University of Belfast; Belfast BT9 5AG U.K
| | - Narain D. Sharma
- School of Chemistry and Chemical Engineering; Queen's University of Belfast; Belfast BT9 5AG U.K
| | - Peter B. A. McIntyre
- School of Chemistry and Chemical Engineering; Queen's University of Belfast; Belfast BT9 5AG U.K
| | - Paul J. Stevenson
- School of Chemistry and Chemical Engineering; Queen's University of Belfast; Belfast BT9 5AG U.K
| | - W. Colin McRoberts
- Agri-food and Biosciences Institute for Northern Ireland; Belfast BT9 5PX U.K
| | - Amit Gohil
- School of Biological Sciences; Queen's University of Belfast; Belfast BT9 7BL U.K
| | - Patrick Hoering
- School of Biological Sciences; Queen's University of Belfast; Belfast BT9 7BL U.K
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10
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Boyd DR, Sharma ND, Goodrich PA, Malone JF, McConville G, Harrison JS, Stevenson PJ, Allen CCR. Enantiopurity and absolute configuration determination of arene cis-dihydrodiol metabolites and derivatives using chiral boronic acids. Chirality 2017; 30:5-18. [PMID: 29024058 DOI: 10.1002/chir.22764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/19/2017] [Accepted: 07/24/2017] [Indexed: 02/03/2023]
Abstract
The relative merits of the methods employed to determine enantiomeric excess (ee) values and absolute configurations of chiral arene and alkene cis-1,2-diol metabolites, including boronate formation, using racemic or enantiopure (+) and (-)-2-(1-methoxyethyl)phenylboronic acid (MEPBA), are discussed. Further applications of: 1) MEPBA derived boronates of chiral mono- and poly-cyclic arene cis-dihydrodiol, cyclohex-2-en-1-one cis-diol, heteroarene cis/trans-2,3-diol, and catechol metabolites in estimating their ee values, and 2) new chiral phenylboronic acids, 2-[1-methoxy-2,2-dimethylpropyl]phenyl boronic acid (MDPBA) and 2-[1-methoxy-1-phenylmethyl]phenyl boronic acid (MPPBA) and their advantages over MEPBA, as reagents for stereochemical analysis of arene and alkene cis-diol metabolites, are presented.
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Affiliation(s)
- Derek R Boyd
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Narain D Sharma
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Peter A Goodrich
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - John F Malone
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Gareth McConville
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - John S Harrison
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Paul J Stevenson
- School of Chemistry and Chemical Engineering, Queen's University, Belfast, UK
| | - Christopher C R Allen
- School of Biological Sciences and Institute for Global and Food Security, Queen's University, Belfast, UK
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11
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Li CS, Yang BJ, Turkson J, Cao S. Anti-proliferative ambuic acid derivatives from Hawaiian endophytic fungus Pestalotiopsis sp. FT172. PHYTOCHEMISTRY 2017; 140:77-82. [PMID: 28463686 PMCID: PMC5542815 DOI: 10.1016/j.phytochem.2017.04.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 04/11/2017] [Accepted: 04/21/2017] [Indexed: 06/01/2023]
Abstract
Five previously undescribed ambuic acid derivatives, pestallic acids A-E and three known analogs were isolated from the cultured broth of Pestalotiopsis sp. FT172. The structures of the pestallic acids A-E were determined through the analysis of HRMS and NMR spectroscopic data. The absolute configurations (ACs) of pestallic acids B-E were assigned by comparison of the experimental electric circular dichroism (ECD) spectra or the optical rotations with those in the literature. All compounds were tested against A2780 and cisplatin resistant A2780 (A2780CisR) cell lines. Pestallic acid E and (+)-ambuic acid showed potent activities with IC50 values from 3.3 to 17.0 μM.
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Affiliation(s)
- Chun-Shun Li
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200 West Kawili Street, Hilo, HI 96720, USA; Natural Products and Experimental Therapeutics, University of Hawai'i Cancer Center, 701 Ilalo Street, Honolulu, HI 96813, USA
| | - Bao-Jun Yang
- Natural Products and Experimental Therapeutics, University of Hawai'i Cancer Center, 701 Ilalo Street, Honolulu, HI 96813, USA
| | - James Turkson
- Natural Products and Experimental Therapeutics, University of Hawai'i Cancer Center, 701 Ilalo Street, Honolulu, HI 96813, USA
| | - Shugeng Cao
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200 West Kawili Street, Hilo, HI 96720, USA; Natural Products and Experimental Therapeutics, University of Hawai'i Cancer Center, 701 Ilalo Street, Honolulu, HI 96813, USA.
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12
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Höring P, Rothschild-Mancinelli K, Sharma ND, Boyd DR, Allen CC. Oxidative biotransformations of phenol substrates catalysed by toluene dioxygenase: A molecular docking study. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Masnyk M, Butkiewicz A, Górecki M, Luboradzki R, Bannwarth C, Grimme S, Frelek J. Synthesis and Comprehensive Structural and Chiroptical Characterization of Enones Derived from (−)-α-Santonin by Experiment and Theory. J Org Chem 2016; 81:4588-600. [DOI: 10.1021/acs.joc.6b00416] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Marek Masnyk
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Aleksandra Butkiewicz
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Marcin Górecki
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Roman Luboradzki
- Institute
of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Christoph Bannwarth
- Mulliken
Center for Theoretical Chemistry, Institute of Physical and Theoretical
Chemistry, University of Bonn, Beringstr. 4, 53115 Bonn, Germany
| | - Stefan Grimme
- Mulliken
Center for Theoretical Chemistry, Institute of Physical and Theoretical
Chemistry, University of Bonn, Beringstr. 4, 53115 Bonn, Germany
| | - Jadwiga Frelek
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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14
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Otto A, Porzel A, Schmidt J, Brandt W, Wessjohann L, Arnold N. Structure and Absolute Configuration of Pseudohygrophorones A(12) and B(12), Alkyl Cyclohexenone Derivatives from Hygrophorus abieticola (Basidiomycetes). JOURNAL OF NATURAL PRODUCTS 2016; 79:74-80. [PMID: 26722697 DOI: 10.1021/acs.jnatprod.5b00675] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pseudohygrophorones A(12) (1) and B(12) (2), the first naturally occurring alkyl cyclohexenones from a fungal source, and the recently reported hygrophorone B(12) (3) have been isolated from fruiting bodies of the basidiomycete Hygrophorus abieticola Krieglst. ex Gröger & Bresinsky. Their structures were assigned on the basis of extensive one- and two-dimensional NMR spectroscopic analysis as well as ESI-HRMS measurements. The absolute configuration of the three stereogenic centers in the diastereomeric compounds 1 and 2 was established with the aid of (3)JH,H and (4)JH,H coupling constants, NOE interactions, and conformational analysis in conjunction with quantum chemical CD calculations. It was concluded that pseudohygrophorone A(12) (1) is 4S,5S,6S configured, while pseudohygrophorone B(12) (2) was identified as the C-6 epimer of 1, corresponding to the absolute configuration 4S,5S,6R. In addition, the mass spectrometric fragmentation behavior of 1-3 obtained by the higher energy collisional dissociation method allows a clear distinction between the pseudohygrophorones (1 and 2) and hygrophorone B(12) (3). The isolated compounds 1-3 exhibited pronounced activity against phytopathogenic organisms.
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Affiliation(s)
- Alexander Otto
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Andrea Porzel
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Jürgen Schmidt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Wolfgang Brandt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Ludger Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Norbert Arnold
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
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15
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Janiak A, Petryk M, Barbour LJ, Kwit M. Readily prepared inclusion forming chiral calixsalens. Org Biomol Chem 2016; 14:669-673. [DOI: 10.1039/c5ob02090e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral, rigid vase-like calixsalens show unprecedented substituent-driven self-association and provide supermolecules of contrasting character.
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Affiliation(s)
- Agnieszka Janiak
- Department of Chemistry and Polymer Science
- University of Stellenbosch
- Stellenbosch
- South Africa
- Department of Chemistry
| | - Małgorzata Petryk
- Department of Chemistry
- Adam Mickiewicz University
- Poznan
- Poland
- Wielkopolska Center for Advanced Technologies (WCAT)
| | - Leonard J. Barbour
- Department of Chemistry and Polymer Science
- University of Stellenbosch
- Stellenbosch
- South Africa
| | - Marcin Kwit
- Department of Chemistry
- Adam Mickiewicz University
- Poznan
- Poland
- Institute of Organic Chemistry
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16
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Gutiérrez-Cepeda A, Fernández JJ, Norte M, Montalvão S, Tammela P, Souto ML. Acetate-Derived Metabolites from the Brown Alga Lobophora variegata. JOURNAL OF NATURAL PRODUCTS 2015; 78:1716-22. [PMID: 26126835 DOI: 10.1021/acs.jnatprod.5b00415] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Seven new nonadecaketides (1-7), lobophorols A-C, lobophopyranones A and B, and lobophorones A and B, along with the first naturally occurring related metabolites (8-10), were isolated from specimens of Lobophora variegata collected from the Canary Islands. Their structures were determined by extensive spectroscopic methods. In addition, an insight into the biosynthesis of these compounds on the basis of the involvement of type III polyketide synthases is proposed. Lobophorol A (1) showed significant antibacterial activity against Staphylococcus aureus.
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Affiliation(s)
- Adrián Gutiérrez-Cepeda
- †Institute for Bio-Organic Chemistry "Antonio González", Center for Biomedical Research of the Canary Islands (CIBICAN), Department of Organic Chemistry, University of La Laguna, 38206 La Laguna, Tenerife, Spain
| | - José J Fernández
- †Institute for Bio-Organic Chemistry "Antonio González", Center for Biomedical Research of the Canary Islands (CIBICAN), Department of Organic Chemistry, University of La Laguna, 38206 La Laguna, Tenerife, Spain
| | - Manuel Norte
- †Institute for Bio-Organic Chemistry "Antonio González", Center for Biomedical Research of the Canary Islands (CIBICAN), Department of Organic Chemistry, University of La Laguna, 38206 La Laguna, Tenerife, Spain
| | - Sofia Montalvão
- §Centre for Drug Research, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014 Helsinki, Finland
| | - Päivi Tammela
- §Centre for Drug Research, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014 Helsinki, Finland
| | - María L Souto
- †Institute for Bio-Organic Chemistry "Antonio González", Center for Biomedical Research of the Canary Islands (CIBICAN), Department of Organic Chemistry, University of La Laguna, 38206 La Laguna, Tenerife, Spain
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17
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Honmura Y, Takekawa H, Tanaka K, Maeda H, Nehira T, Hehre W, Hashimoto M. Computation-Assisted Structural Elucidation of Epoxyroussoeone and Epoxyroussoedione Isolated from Roussoella japanensis KT1651. JOURNAL OF NATURAL PRODUCTS 2015; 78:1505-1510. [PMID: 26110600 DOI: 10.1021/np500924n] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The structures of epoxyroussoenone (1) and epoxyroussoedione (3) isolated from a culture broth of Roussoella japanensis KT1651 were determined. Although NMR spectra provided insufficient structural information, computation of the theoretical chemical shifts with DFT EDF2/6-31G* enabled us to elucidate not only the planar structure, but also the relative configuration. Their ECD (electric circular dichroism) spectra suggested the absolute configurations, which were confirmed with time-dependent DFT calculations employing BHandHLYP/TZVP. The ECD calculations for other stereoisomers yielded obviously different spectral profiles, thus confirming the relative structures of 1 and 3.
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Affiliation(s)
- Yuna Honmura
- †Faculty of Agriculture and Bioscience, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Hiroto Takekawa
- †Faculty of Agriculture and Bioscience, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Kazuaki Tanaka
- †Faculty of Agriculture and Bioscience, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Hayato Maeda
- †Faculty of Agriculture and Bioscience, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Tatsuo Nehira
- ‡Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8521, Japan
| | - Warren Hehre
- §Wavefunction, Inc., 18401 Von Karman Avenue, Suite 370, Irvine, California 92612, United States
| | - Masaru Hashimoto
- †Faculty of Agriculture and Bioscience, Hirosaki University, 3-Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
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18
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Boyd DR, Sharma ND, Berberian MV, Cleij M, Hardacre C, Ljubez V, McConville G, Stevenson PJ, Kulakov LA, Allen CCR. Arenecis-Diol Dehydrogenase-Catalysed Regio- and Stereoselective Oxidation of Arene-, Cycloalkane- and Cycloalkene-cis-diols to Yield Catechols and Chiral α-Ketols. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500189] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Boyd DR, Sharma ND, Malone JF, McIntyre PBA, McRoberts C, Floyd S, Allen CCR, Gohil A, Coles SJ, Horton PN, Stevenson PJ. Toluene dioxygenase-catalyzed synthesis and reactions of cis-diol metabolites derived from 2- and 3-methoxyphenols. J Org Chem 2015; 80:3429-39. [PMID: 25756661 DOI: 10.1021/jo5028968] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Using toluene dioxygenase as biocatalyst, enantiopure cis-dihydrodiol and cis-tetrahydrodiol metabolites, isolated as their ketone tautomers, were obtained from meta and ortho methoxyphenols. Although these isomeric phenol substrates are structurally similar, the major bioproducts from each of these biotransformations were found at different oxidation levels. The relatively stable cyclohexenone cis-diol metabolite from meta methoxyphenol was isolated, while the corresponding metabolite from ortho methoxyphenol was rapidly bioreduced to a cyclohexanone cis-diol. The chemistry of the 3-methoxycyclohexenone cis-diol product was investigated and elimination, aromatization, hydrogenation, regioselective O-exchange, Stork-Danheiser transposition and O-methylation reactions were observed. An offshoot of this technology provided a two-step chemoenzymatic synthesis, from meta methoxyphenol, of a recently reported chiral fungal metabolite; this synthesis also established the previously unassigned absolute configuration.
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Affiliation(s)
- Derek R Boyd
- †School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AG, U.K
| | - Narain D Sharma
- †School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AG, U.K
| | - John F Malone
- †School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AG, U.K
| | - Peter B A McIntyre
- †School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AG, U.K
| | - Colin McRoberts
- §Agri-food and Biosciences Institute for Northern Ireland, Belfast, BT9 5PX, U.K
| | - Stewart Floyd
- §Agri-food and Biosciences Institute for Northern Ireland, Belfast, BT9 5PX, U.K
| | - Christopher C R Allen
- ‡School of Biological Sciences, Queen's University of Belfast, Belfast, BT9 5AG, U.K
| | - Amit Gohil
- ‡School of Biological Sciences, Queen's University of Belfast, Belfast, BT9 5AG, U.K
| | - Simon J Coles
- ∥National Crystallography Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ, U.K
| | - Peter N Horton
- ∥National Crystallography Service, School of Chemistry, University of Southampton, Southampton, SO17 1BJ, U.K
| | - Paul J Stevenson
- †School of Chemistry and Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AG, U.K
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20
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Frelek J, Butkiewicz A, Górecki M, Wojcieszczyk RK, Luboradzki R, Kwit M, Rode MF, Szczepek WJ. Structure – chiroptical properties relationship of cisoid enones with an α-methylenecyclopentanone unit. RSC Adv 2014. [DOI: 10.1039/c4ra04991h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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21
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Podlech J, Fleck SC, Metzler M, Bürck J, Ulrich AS. Determination of the absolute configuration of perylene quinone-derived mycotoxins by measurement and calculation of electronic circular dichroism spectra and specific rotations. Chemistry 2014; 20:11463-70. [PMID: 25056998 DOI: 10.1002/chem.201402567] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Indexed: 01/14/2023]
Abstract
Altertoxins I-III, alterlosins I and II, alteichin (alterperylenol), stemphyltoxins I-IV, stemphyperylenol, stemphytriol, 7-epi-8-hydroxyaltertoxin I, and 6-epi-stemphytriol are mycotoxins derived from perylene quinone, for which the absolute configuration was not known. Electronic circular dichroism (ECD) spectra were calculated for these compounds and compared with measured spectra of altertoxins I-III, alteichin, and stemphyltoxin III and with reported Cotton effects. Specific rotations were calculated and compared with reported specific rotations. The absolute configuration of all the toxins, except for stemphyltoxin IV, could thus be determined. The validity of the assignment was high whenever reported ECD data were available for comparison, and the validity was lower when the assignment was based only on the comparison of calculated and reported specific rotations. ECD spectra are intrinsically different for toxins with a biphenyl substructure and for toxins derived from dihydroanthracene.
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Affiliation(s)
- Joachim Podlech
- Institute for Organic Chemistry, Karlsruhe Institute for Technology (KIT), Campus South, Fritz-Haber-Weg 6, 76131 Karlsruhe (Germany), Fax: (+49) 721-608-47652.
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22
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Greff S, Zubia M, Genta-Jouve G, Massi L, Perez T, Thomas OP. Mahorones, highly brominated cyclopentenones from the red alga Asparagopsis taxiformis. JOURNAL OF NATURAL PRODUCTS 2014; 77:1150-1155. [PMID: 24746270 DOI: 10.1021/np401094h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The red alga Asparagopsis taxiformis (Rhodophyta, Bonnemaisoniaceae) has been shown to produce a large diversity of halogenated volatile organic compounds, with one to four carbons. As the distribution of this alga may expand worldwide, we implemented a research program that aims to understand the functions of its specialized metabolome in marine ecosystems. Phytochemical investigations performed on A. taxiformis gametophyte stages from the Indian Ocean revealed two new highly brominated cyclopentenones named mahorone (1) and 5-bromomahorone (2). They are the first examples of natural 2,3-dibromocyclopentenone derivatives. Their structure elucidation was achieved using spectrometric methods including NMR and MS. A standardized ecotoxicological assay was used as an assessment of their role in the environment, revealing high toxicities for both compounds (EC50 0.16 μM for 1 and 2). Additionally, both compounds were evaluated in antibacterial, antifungal, and cytotoxicity assays. Compounds 1 and 2 exhibit mild antibacterial activities against the human pathogen Acinetobacter baumannii.
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Affiliation(s)
- Stéphane Greff
- Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale, IMBE UMR 7263 CNRS/IRD/ Aix-Marseille Université/Université d'Avignon et des Pays du Vaucluse , Station Marine d'Endoume, rue de la Batterie des Lions, 13007 Marseille, France
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23
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Neomacrophorin I, II, and III, novel drimenyl cyclohexanes with hydroxylated butanoates from Trichoderma sp. 1212-03. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.087] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Kiem PV, Minh CV, Nhiem NX, Cuc NT, Quang NV, Tuan Anh HL, Tai BH, Yen PH, Hoai NT, Ho KY, Kim N, Park S, Kim SH. Muurolane-type sesquiterpenes from marine sponge Dysidea cinerea. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2014; 52:51-56. [PMID: 24243694 DOI: 10.1002/mrc.4030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 10/14/2013] [Accepted: 10/15/2013] [Indexed: 06/02/2023]
Abstract
Seven new muurolane-type sesquiterpenes, (4R,5R)-muurol-1(6),10(14)-diene-4,5-diol (1), (4R,5R)-muurol-1(6)-ene-4,5-diol (2), (4R,5R,10R)-10-methoxymuurol-1(6)-ene-4,5-diol (3), (4S)-4-hydroxy-1,10-seco-muurol-5-ene-1,10-dione (4), (4R)-4-hydroxy-1,10-seco-muurol-5-ene-1,10-dione (5), (6S,10S)-6,10-dihydroxy-7,8-seco-2,8-cyclo-muurol-4(5),7(11)-diene-12-oic acid (6), and (6R,10S)-6,10-dihydroxy-7,8-seco-2,8-cyclo-muurol-4(5),7(11)-diene-12-oic acid (7) were isolated from the marine sponge Dysidea cinerea. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D-NMR, 2D-NMR, and CD spectra as well as by comparing the NMR data with those reported in the literature.
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Affiliation(s)
- Phan Van Kiem
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
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25
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Wysocki J, Kwit M, Gawronski J. Absolute Configuration Determination and Convenient Asymmetric Synthesis of cis
-3-(9-Anthryl)cyclohexanol with Proline as a Catalyst. Chirality 2012; 24:833-9. [DOI: 10.1002/chir.22079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 05/11/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Jędrzej Wysocki
- Department of Chemistry; Adam Mickiewicz University; Poznan Poland
| | - Marcin Kwit
- Department of Chemistry; Adam Mickiewicz University; Poznan Poland
| | - Jacek Gawronski
- Department of Chemistry; Adam Mickiewicz University; Poznan Poland
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26
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Hopmann KH, Šebestík J, Novotná J, Stensen W, Urbanová M, Svenson J, Svendsen JS, Bouř P, Ruud K. Determining the Absolute Configuration of Two Marine Compounds Using Vibrational Chiroptical Spectroscopy. J Org Chem 2012; 77:858-69. [DOI: 10.1021/jo201598x] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Jaroslav Šebestík
- Institute of Organic Chemistry
and Biochemistry, Academy of Sciences, Flemingovo nám. 2, 166
10 Prague, Czech Republic
| | | | - Wenche Stensen
- Lytix Biopharma AS, Tromsø Research
Park, N-9294 Tromsø, Norway
| | | | | | | | - Petr Bouř
- Institute of Organic Chemistry
and Biochemistry, Academy of Sciences, Flemingovo nám. 2, 166
10 Prague, Czech Republic
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27
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Boyd DR, Sharma ND, Malone JF, McIntyre PBA, Stevenson PJ, Allen CCR, Kwit M, Gawronski J. Structure, stereochemistry and synthesis of enantiopure cyclohexenone cis-diol bacterial metabolites derived from phenols. Org Biomol Chem 2012; 10:6217-29. [DOI: 10.1039/c2ob25079a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Kwit M, Gawronski J. Refined model of optical activity of cis-dihydrodiol metabolites: Role of 1,3-diene conformation in the electronic circular dichroism spectra. Chirality 2011; 23:744-51. [DOI: 10.1002/chir.20974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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29
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Boyd DR, Sharma ND, Stevenson PJ, Blain M, McRoberts C, Hamilton JTG, Argudo JM, Mundi H, Kulakov LA, Allen CCR. Dioxygenase-catalysed cis-dihydroxylation of meta-substituted phenols to yield cyclohexenone cis-diol and derived enantiopure cis-triol metabolites. Org Biomol Chem 2011; 9:1479-90. [PMID: 21221457 DOI: 10.1039/c0ob00894j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
cis-Dihydroxylation of meta-substituted phenol (m-phenol) substrates, to yield the corresponding cyclohexenone cis-diol metabolites, was catalysed by arene dioxygenases present in mutant and recombinant bacterial strains. The presence of cyclohexenone cis-diol metabolites and several of their cyclohexene and cyclohexane cis-triol derivatives was detected by LC-TOFMS analysis and confirmed by NMR spectroscopy. Structural and stereochemical analyses of chiral ketodiol bioproducts, was carried out using NMR and CD spectroscopy and stereochemical correlation methods. The formation of enantiopure cyclohexenone cis-diol metabolites is discussed in the context of postulated binding interactions of the m-phenol substrates at the active site of toluene dioxygenase (TDO).
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Affiliation(s)
- Derek R Boyd
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, UK BT9 5AG.
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