201
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Fernandes C, Tiritan ME, Cravo S, Phyo YZ, Kijjoa A, Silva AMS, Cass QB, Pinto MMM. New chiral stationary phases based on xanthone derivatives for liquid chromatography. Chirality 2017; 29:430-442. [PMID: 28608589 DOI: 10.1002/chir.22706] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/27/2017] [Accepted: 03/19/2017] [Indexed: 11/08/2022]
Abstract
Six chiral derivatives of xanthones (CDXs) were covalently bonded to silica, yielding the corresponding xanthonic chiral stationary phases (XCSPs). The new XCSPs were packed into stainless-steel columns with 150 x 4.6 mm i.d. Moreover, the greening of the chromatographic analysis by reducing the internal diameter (150 x 2.1 mm i.d.) of the liquid chromatography (LC) columns was also investigated. The enantioselective capability of these phases was evaluated by LC using different chemical classes of chiral compounds, including several types of drugs. A library of CDXs was evaluated in order to explore the principle of reciprocity as well as the chiral self-recognition phenomenon. The separation of enantiomeric mixtures of CDXs was investigated under multimodal elution conditions. The XCSPs provided high specificity for the enantiomeric mixtures of CDXs evaluated mainly under normal-phase elution conditions. Furthermore, two XCSPs were prepared with both enantiomers of the same xanthonic selector in order to confirm the inversion order elution.
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Affiliation(s)
- Carla Fernandes
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Matosinhos, Portugal
| | - Maria Elizabeth Tiritan
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Matosinhos, Portugal.,CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde (IINFACTS), Gandra, PRD, Portugal
| | - Sara Cravo
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Matosinhos, Portugal
| | - Ye' Zaw Phyo
- ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Anake Kijjoa
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Matosinhos, Portugal.,ICBAS-Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Artur M S Silva
- Departamento de Química & QOPNA, Universidade de Aveiro, Aveiro, Portugal
| | - Quezia B Cass
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - Madalena M M Pinto
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Matosinhos, Portugal
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202
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Zhang XL, Tang CK, Xia AB, Feng KX, Du XH, Xu DQ. One-Pot Organocatalytic Michael Addition/I2
-Mediated Cyclization Sequence: Metal-Free Synthesis of Spiropyrazolones from 1,3-Diketones and Unsaturated Pyrazolones. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700474] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Xiao-Long Zhang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Cheng-Ke Tang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Ai-Bao Xia
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Kai-Xiang Feng
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Xiao-Hua Du
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Dan-Qian Xu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology; Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province; Zhejiang University of Technology; 310014 Hangzhou P. R. China
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203
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Chiral Derivatives of Xanthones: Investigation of the Effect of Enantioselectivity on Inhibition of Cyclooxygenases (COX-1 and COX-2) and Binding Interaction with Human Serum Albumin. Pharmaceuticals (Basel) 2017; 10:ph10020050. [PMID: 28561772 PMCID: PMC5490407 DOI: 10.3390/ph10020050] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 05/25/2017] [Accepted: 05/27/2017] [Indexed: 12/02/2022] Open
Abstract
Searching of new enantiomerically pure chiral derivatives of xanthones (CDXs) with potential pharmacological properties, particularly those with anti-inflammatory activity, has remained an area of interest of our group. Herein, we describe in silico studies and in vitro inhibitory assays of cyclooxygenases (COX-1 and COX-2) for different enantiomeric pairs of CDXs. The evaluation of the inhibitory activities was performed by using the COX Inhibitor Screening Assay Kit. Docking simulations between the small molecules (CDXs; known ligands and decoys) and the enzyme targets were undertaken with AutoDock Vina embedded in PyRx—Virtual Screening Tool software. All the CDXs evaluated exhibited COX-1 and COX-2 inhibition potential as predicted. Considering that the (S)-(−)-enantiomer of the nonsteroidal anti-inflammatory drug ketoprofen preferentially binds to albumin, resulting in lower free plasma concentration than (R)-(+)-enantiomer, protein binding affinity for CDXs was also evaluated by spectrofluorimetry as well as in in silico. For some CDXs enantioselectivity was observed.
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204
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Chernov NM, Shutov RV, Sharoyko VV, Kuz'mich NN, Belyakov AV, Yakovlev IP. Synthetic Route to 4,4a- and 3,4-Dihydroxanthones through [4+2] Cycloaddition and Base-Assisted Sigmatropic Rearrangement. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700310] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nikita M. Chernov
- Organic Chemistry Department; Saint-Petersburg State Chemical Pharmaceutical Academy; Prof. Popov st. 14 197376 Saint-Petersburg Russian Federation
| | - Roman V. Shutov
- Organic Chemistry Department; Saint-Petersburg State Chemical Pharmaceutical Academy; Prof. Popov st. 14 197376 Saint-Petersburg Russian Federation
| | - Vladimir V. Sharoyko
- Biomedicinal Chemistry Department; Saint-Petersburg State University; Universitetskii pr. 26 198504 Saint-Petersburg Russian Federation
| | - Nikolay N. Kuz'mich
- Department of Drug Safety; Research Institute of Influenza; WHO National Influenza Centre of Russia; Prof. Popov st. 15/17 197376 Saint-Petersburg Russian Federation
- Laboratory of Bioinformatics; Institute of Pharmacy and Translational medicine, I. M. Sechenov; First Moscow State Medical University; 8-2 Trubetskaya St. 119991 Moscow Russian Federation
| | - Alexander V. Belyakov
- Department of Physics; Saint-Petersburg State Institute of Technology (Technical University); Moskovskii pr. 26 190013 Saint-Petersburg Russian Federation
| | - Igor P. Yakovlev
- Organic Chemistry Department; Saint-Petersburg State Chemical Pharmaceutical Academy; Prof. Popov st. 14 197376 Saint-Petersburg Russian Federation
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205
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Li J, Zhao YL, Huang HY, Wang YZ. Phytochemistry and Pharmacological Activities of the Genus Swertia (Gentianaceae): A Review. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2017; 45:667-736. [PMID: 28490237 DOI: 10.1142/s0192415x17500380] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Swertia plants have been considered to be medicinal plants useful for the treatment of various ailments for thousands of years, especially in Asian countries. This is due to the broad variety of chemical compounds that provide multiple ligands for bonding to different endogenous biomacromolecules for patients. Chemical constituents and pharmacological activities of Swertia plants are summarized in this paper. Approximately 419 metabolites and 40 bioactive compounds have been reported from 30 Swertia species, including xanthones, flavonoids, seco-iridiods, iridiods, triterpenoids, alkaloids, volatiles, and other secondary metabolites. The bioactivities of Swertia plants include anticarcinogenic, hepatoprotective, anti-oxidant, hypoglycemic, anthelmintic, antibacterial, antifungal, anti-diabetic, gut, and airways modulatory, metabolizing isozymes inhibitory, neuroprotective, HIV-I reverse transcriptases inhibitory, anticholinergic, and CNS-depressant activities, etc. In addition, biosynthetic pathways of xanthones, and seco-iridiods, two most important secondary metabolites for Swertia, are elucidated. The xanthones biosynthetic pathway is a mixed biosynthetic pathway involved the shikimate and the malonate routes, and the seco-iridoid pathway starts with geraniol derived from IPP which is produced either via the MEP or the MVA pathway. This review will offer a reference for future researches on the protection of natural resources, the investigation of therapeutic basis, new drug development, and so forth. Metabolic pathways of some crucial active compounds were also discussed in this review.
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Affiliation(s)
- Jie Li
- * Institute of Medicine Plants, Yunnan Academy of Agricultural Sciences, Kunming 650200, P. R. China.,† College of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650500, P. R. China
| | - Yan-Li Zhao
- * Institute of Medicine Plants, Yunnan Academy of Agricultural Sciences, Kunming 650200, P. R. China
| | - Heng-Yu Huang
- † College of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650500, P. R. China
| | - Yuan-Zhong Wang
- * Institute of Medicine Plants, Yunnan Academy of Agricultural Sciences, Kunming 650200, P. R. China
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206
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Meng X, Lv S, Cheng D, Hu Q, Ma J, Liu B, Hu Y. Fused Multifunctionalized Chromenes from Tetraynes and α,β-Unsaturated Aldehydes. Chemistry 2017; 23:6264-6271. [PMID: 28295732 DOI: 10.1002/chem.201701009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Indexed: 01/06/2023]
Abstract
The synthesis of fused, highly substituted chromenes in a one-pot-three-step cascade hexadehydro-Diels-Alder reaction of tetraynes followed by an intermolecular α,β-unsaturated aldehyde rearrangement is reported. The target compounds were prepared by the condensation of malonates with 3-bromo-1-propyne, and the resulting 2,2-di(1-propyn-3-yl)malonates underwent cross-coupling with phenylethynyl bromides to afford 2,2-di(5-phenyl-2,4-pentadiynyl)malonates, which underwent intramolecular cyclization to produce tricyclic chromenes. The overall transformation involves the formation of four new C-C bonds and one new C-aryl-O-C-aryl bond by both intramolecular cyclization and intermolecular rearrangement reactions. These constitute a key strategy for the construction of a highly substituted natural chromene core and a robust method for producing other chromenes.
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Affiliation(s)
- Xiangzhen Meng
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Shuang Lv
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Dong Cheng
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Qiong Hu
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Jie Ma
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Baohua Liu
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
| | - Yimin Hu
- Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Functional Molecular-Based Materials, Institute of Organic Chemistry, School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui, 241000, P. R. China
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207
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Carraro ML, Palmeira A, Tiritan ME, Fernandes C, Pinto MMM. Resolution, determination of enantiomeric purity and chiral recognition mechanism of new xanthone derivatives on (S,S)-whelk-O1 stationary phase. Chirality 2017; 29:247-256. [PMID: 28439971 DOI: 10.1002/chir.22703] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 02/13/2017] [Accepted: 02/17/2017] [Indexed: 02/04/2023]
Abstract
The enantioresolution and determination of the enantiomeric purity of 32 new xanthone derivatives, synthesized in enantiomerically pure form, were investigated on (S,S)-Whelk-O1 chiral stationary phase (CSP). Enantioselectivity and resolution (α and RS ) with values ranging from 1.41-6.25 and from 1.29-17.20, respectively, were achieved. The elution was in polar organic mode with acetonitrile/methanol (50:50 v/v) as mobile phase and, generally, the (R)-enantiomer was the first to elute. The enantiomeric excess (ee) for all synthesized xanthone derivatives was higher than 99%. All the enantiomeric pairs were enantioseparated, even those without an aromatic moiety linked to the stereogenic center. Computational studies for molecular docking were carried out to perform a qualitative analysis of the enantioresolution and to explore the chiral recognition mechanisms. The in silico results were consistent with the chromatographic parameters and elution orders. The interactions between the CSP and the xanthone derivatives involved in the chromatographic enantioseparation were elucidated.
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Affiliation(s)
- Maria L Carraro
- Laboratório de Química Orgânica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal
| | - Andreia Palmeira
- Laboratório de Química Orgânica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Edifício do Terminal de Cruzeiros do Porto de Leixões, Matosinhos, Portugal
| | - Maria E Tiritan
- Laboratório de Química Orgânica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Edifício do Terminal de Cruzeiros do Porto de Leixões, Matosinhos, Portugal.,CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde (IINFACTS), Gandra, Portugal
| | - Carla Fernandes
- Laboratório de Química Orgânica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Edifício do Terminal de Cruzeiros do Porto de Leixões, Matosinhos, Portugal
| | - Madalena M M Pinto
- Laboratório de Química Orgânica, Departamento de Ciências Químicas, Faculdade de Farmácia, Porto, Portugal.,Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Edifício do Terminal de Cruzeiros do Porto de Leixões, Matosinhos, Portugal
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208
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Hu Z, Liu G. Rhodium(III)-Catalyzed Cascade Redox-Neutral C-H Functionalization and Aromatization: Synthesis of Unsymmetrical ortho
-Biphenols. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601296] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Zhiyong Hu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Guixia Liu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Road Shanghai 200032 People's Republic of China
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209
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Geiger L, Nieger M, Bräse S. Scope and Limitations of the Domino Vinylogous Aldol/ oxa-Michael Reaction. ChemistrySelect 2017. [DOI: 10.1002/slct.201700667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Larissa Geiger
- Karlsruhe Institute of Technology; Institute of Organic Chemistry; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Martin Nieger
- Department of Chemistry; University of Helsinki; P.O. Box 55 (A.I. Virtasen aukio 1), FIN- 00014 University of Helsinki Finland
| | - Stefan Bräse
- Karlsruhe Institute of Technology; Institute of Organic Chemistry; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
- Karlsruhe Institute of Technology; Institute of Toxicology and Genetics; Hermann-von-Helmholtz-Platz 1, D- 76344 Eggenstein-Leopoldshafen Germany
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210
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Kodama T, Ito T, Dibwe DF, Woo SY, Morita H. Syntheses of benzophenone-xanthone hybrid polyketides and their antibacterial activities. Bioorg Med Chem Lett 2017; 27:2397-2400. [PMID: 28416134 DOI: 10.1016/j.bmcl.2017.04.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 02/22/2017] [Accepted: 04/05/2017] [Indexed: 10/19/2022]
Abstract
Muchimangins are benzophenone-xanthone hybrid polyketides produced by Securidaca longepedunculata. However, their biological activities have not been fully investigated, since they are minor constituents in this plant. To evaluate the possibility of muchimangins as antibacterial agent candidates, five muchimangin analogs were synthesized from 2,4,5-trimethoxydiphenyl methanol and the corresponding xanthones, by utilizing p-toluenesulfonic acid monohydrate for the Brønsted acid-catalysis. The antibacterial assays against Gram-positive bacteria, Staphylococcus aureus and Bacillus subtilis, and Gram-negative bacteria, Klebsiella pneumoniae and Escherichia coli, revealed that the muchimangin analogs (±)-1,3,6,8-tetrahydroxy-4-(phenyl-(2',4',5'-trimethoxyphenyl)methyl)-xanthone (1), (±)-1,3,6-trihydroxy-4-(phenyl-(2',4',5'-trimethoxyphenyl)methyl)-xanthone (2), and (±)-1,3-dihydroxy-4-(phenyl-(2',4',5'-trimethoxyphenyl)methyl)-xanthone (3) showed significant activities against S. aureus, with MIC values of 10.0, 10.0, and 25.0μM, respectively. Analogs (±)-1 and (±)-2 also exhibited antibacterial activities against B. subtilis, with MIC values of 50.0 and 12.5μM, respectively. Furthermore, (+)-3 enhanced the antibacterial activity against S. aureus, with a MIC value of 10μM.
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Affiliation(s)
- Takeshi Kodama
- Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan
| | - Takuya Ito
- Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan.
| | - Dya Fita Dibwe
- Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan
| | - So-Yeun Woo
- Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan
| | - Hiroyuki Morita
- Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan.
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211
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Yu FC, Lin XR, Liu ZC, Zhang JH, Liu FF, Wu W, Ma YL, Qu WW, Yan SJ, Lin J. Beyond the Antagonism: Self-Labeled Xanthone Inhibitors as Modeled "Two-in-One" Drugs in Cancer Therapy. ACS OMEGA 2017; 2:873-889. [PMID: 30023617 PMCID: PMC6044579 DOI: 10.1021/acsomega.6b00545] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 02/28/2017] [Indexed: 05/24/2023]
Abstract
Self-labeled inhibitors (SLIs) are promising for creating links, ranging from cancer therapy and metastatic pathways to mechanistic elucidation. In this study, a new category of "two-in-one" fluorescent xanthone inhibitors was developed for the systematic evaluation of anticancer activity and the selective imaging of cytoplasm in vitro. These xanthone inhibitors presented high fluorescent brightness, working over a wide pH range enabled by a "switchable reaction" of the heterocyclic backbone. The strength and nature of fluorescence were probed via spectroscopic methods and density functional theory calculations on the molecular level, respectively. Along with the potent anticancer activity, which was demonstrated using MTT and clonogenic assays with high fluorescent brightness in the cytoplasm, SLI 3fd could be established as a modeled self-monitoring drug in cancer therapy.
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Affiliation(s)
- Fu-Chao Yu
- Key
Laboratory of Medicinal Chemistry for Natural Resource (Ministry of
Education), Yunnan Provincial Engineering Research Center in University
for Crude Drugs and Pharmaceutical Intermediates, School of Chemical
Science and Technology, Yunnan University, Kunming 650091, P. R. China
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Xin-Rong Lin
- Department of Chemistry and Department of
Biomedical Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - Zhi-Cheng Liu
- Key
Laboratory of Medicinal Chemistry for Natural Resource (Ministry of
Education), Yunnan Provincial Engineering Research Center in University
for Crude Drugs and Pharmaceutical Intermediates, School of Chemical
Science and Technology, Yunnan University, Kunming 650091, P. R. China
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Ji-Hong Zhang
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Fei-Fei Liu
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Wei Wu
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Yu-Lu Ma
- Key
Laboratory of Medicinal Chemistry for Natural Resource (Ministry of
Education), Yunnan Provincial Engineering Research Center in University
for Crude Drugs and Pharmaceutical Intermediates, School of Chemical
Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Wen-Wen Qu
- Faculty of Life Science
and Technology and Faculty of Science, Kunming University
of Science and Technology, Kunming 650504, P. R. China
| | - Sheng-Jiao Yan
- Key
Laboratory of Medicinal Chemistry for Natural Resource (Ministry of
Education), Yunnan Provincial Engineering Research Center in University
for Crude Drugs and Pharmaceutical Intermediates, School of Chemical
Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Jun Lin
- Key
Laboratory of Medicinal Chemistry for Natural Resource (Ministry of
Education), Yunnan Provincial Engineering Research Center in University
for Crude Drugs and Pharmaceutical Intermediates, School of Chemical
Science and Technology, Yunnan University, Kunming 650091, P. R. China
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212
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Xiao Z, Li Y, Gao S. Total Synthesis and Structural Determination of the Dimeric Tetrahydroxanthone Ascherxanthone A. Org Lett 2017; 19:1834-1837. [DOI: 10.1021/acs.orglett.7b00592] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Zheming Xiao
- Shanghai Key Laboratory of
Green Chemistry and Chemical Processes, School of Chemistry and Molecular
Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Yayue Li
- Shanghai Key Laboratory of
Green Chemistry and Chemical Processes, School of Chemistry and Molecular
Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of
Green Chemistry and Chemical Processes, School of Chemistry and Molecular
Engineering, East China Normal University, 3663N Zhongshan Road, Shanghai 200062, China
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213
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Lin S, Koh JJ, Aung TT, Lim F, Li J, Zou H, Wang L, Lakshminarayanan R, Verma C, Wang Y, Tan DTH, Cao D, Beuerman RW, Ren L, Liu S. Symmetrically Substituted Xanthone Amphiphiles Combat Gram-Positive Bacterial Resistance with Enhanced Membrane Selectivity. J Med Chem 2017; 60:1362-1378. [DOI: 10.1021/acs.jmedchem.6b01403] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Shuimu Lin
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
| | - Jun-Jie Koh
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
| | - Thet Tun Aung
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
| | - Fanghui Lim
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
| | - Jianguo Li
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- Bioinformatics Institute (A*STAR), 30
Biopolis Street, 07-01 Matrix, 138671, Singapore
| | - Hanxun Zou
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
| | - Lin Wang
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
| | - Rajamani Lakshminarayanan
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- SRP
Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, 169857, Singapore
| | - Chandra Verma
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- Bioinformatics Institute (A*STAR), 30
Biopolis Street, 07-01 Matrix, 138671, Singapore
- School of
Biological Sciences, Nanyang Technological University, 60 Nanyang
Drive, 637551, Singapore
- Department
of Biological Sciences, National University of Singapore, 14 Science
Drive 4, 117543, Singapore
| | - Yingjun Wang
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
| | - Donald T. H. Tan
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- Singapore National Eye Center, 11 Third Hospital Avenue, 168751, Singapore
| | - Derong Cao
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Roger W. Beuerman
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- SRP
Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, 169857, Singapore
| | - Li Ren
- School
of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
- National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China
| | - Shouping Liu
- Singapore
Eye Research Institute, The Academia, 20 College Road, Discovery Tower
Level 6, 169856, Singapore
- SRP
Neuroscience and Behavioral Disorders, Duke-NUS Graduate Medical School, 169857, Singapore
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214
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Wu X, Fang LZ, Liu FL, Pang XJ, Qin HL, Zhao T, Xu LL, Yang DF, Yang XL. New prenylxanthones, polyketide hemiterpenoid pigments from the endophytic fungus Emericella sp. XL029 and their anti-agricultural pathogenic fungal and antibacterial activities. RSC Adv 2017. [DOI: 10.1039/c7ra04762b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Four new prenylxanthones and five known compounds were isolated from the plant endophytic fungusEmericellasp. XL029. Biological assays revealed that the compounds showed selective inhibitory activity against bacterial and fungal strains.
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Affiliation(s)
- Xia Wu
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
| | - Li-Zhen Fang
- School of Pharmacy
- Xinxiang Medical University
- Xinxiang 453003
- P. R. China
| | - Feng-Lou Liu
- School of Agriculture
- Ningxia University
- Yinchuan 750021
- P. R. China
| | - Xue-Jiao Pang
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
| | - Hai-Li Qin
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
| | - Ting Zhao
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
| | - Lu-Lin Xu
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
| | - Deng-Feng Yang
- State Key Laboratory of Enzyme Technology
- National Engineering Research Centre of Non-food Biorefinery
- Guangxi Academy of Sciences
- Nanning 530007
- P. R. China
| | - Xiao-Long Yang
- Innovative Drug Research Centre (IDRC)
- School of Pharmaceutical Sciences
- Chongqing University (Huxi Campus)
- Chongqing 401331
- P. R. China
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215
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Li TX, Yang MH, Wang Y, Wang XB, Luo J, Luo JG, Kong LY. Unusual dimeric tetrahydroxanthone derivatives from Aspergillus lentulus and the determination of their axial chiralities. Sci Rep 2016; 6:38958. [PMID: 27941865 PMCID: PMC5150534 DOI: 10.1038/srep38958] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 10/31/2016] [Indexed: 12/25/2022] Open
Abstract
The research on secondary metabolites of Aspergillus lentulus afforded eight unusual heterodimeric tetrahydroxanthone derivatives, lentulins A-H (2-9), along with the known compound neosartorin (1). Compounds 1-6 exhibited potent antimicrobial activities especially against methicillin-resistant Staphylococci. Their absolute configurations, particularly the axial chiralities, were unambiguously demonstrated by a combination of electronic circular dichroism (ECD), Rh2(OCOCF3)4-induced ECD experiments, modified Mosher methods, and chemical conversions. Interestingly, compounds 1-4 were the first samples of atropisomers within the dimeric tetrahydroxanthone class. Further investigation of the relationships between their axial chiralities and ECD Cotton effects led to the proposal of a specific CD Exciton Chirality rule to determine the axial chiralities in dimeric tetrahydroxanthones and their derivatives.
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Affiliation(s)
- Tian-Xiao Li
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Ming-Hua Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Ying Wang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Xiao-Bing Wang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Jun Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Jian-Guang Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
| | - Ling-Yi Kong
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, People’s Republic of China
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216
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α-Pyrone derivatives, tetra/hexahydroxanthones, and cyclodepsipeptides from two freshwater fungi. Bioorg Med Chem 2016; 25:795-804. [PMID: 27964996 DOI: 10.1016/j.bmc.2016.11.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 11/28/2016] [Accepted: 11/30/2016] [Indexed: 11/22/2022]
Abstract
Eighteen (1-18) and seven (1, 4, 6-8, 17 and 18) compounds were isolated from organic extracts of axenic cultures of two freshwater fungi Clohesyomyces sp. and Clohesyomyces aquaticus (Dothideomycetes, Ascomycota), respectively. Compounds 1-12 belong to the α-pyrone class of natural products, compounds 13 and 14 were tetrahydroxanthones, compounds 15 and 16 were hexahydroxanthones, while compounds 17 and 18 were cyclodepsipeptides. The structures were elucidated using a set of spectroscopic and spectrometric techniques. The absolute configurations of compounds 2, 3, 6, and 7 were assigned via a modified Mosher's ester method using 1H NMR data. The relative configurations of compounds 14-16 were determined through NOE data. Compounds 1, 2, 6, 8, 13, 14, and 15 were found to inhibit the essential enzyme bacterial peptidyl-tRNA hydrolase (Pth1), with (13; secalonic acid A) being the most potent. Compounds 1 and 4-18 were also evaluated for antimicrobial activity against an array of bacteria and fungi but were found to be inactive.
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217
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Assessing gastric toxicity of xanthone derivatives of anti-inflammatory activity using simulation and experimental approaches. Biophys Chem 2016; 220:20-33. [PMID: 27846425 DOI: 10.1016/j.bpc.2016.10.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 10/12/2016] [Accepted: 10/26/2016] [Indexed: 01/21/2023]
Abstract
Xanthones are tricyclic compounds of natural or synthetic origin exhibiting a broad spectrum of therapeutic activities. Three synthetic xanthone derivatives (KS1, KS2, and KS3) with properties typical for nonsteroidal anti-inflammatory drugs (NSAID) were objects of the presented model study. NSAIDs are in common use however; several of them exhibit gastric toxicity predominantly resulting from their direct interactions with the outermost lipid layer of the gastric mucosa that impair its hydrophobic barrier property. Among the studied xanthones, gastric toxicity of only KS2 has been determined in previous pharmacological studies, and it is low. In this study, carried out using X-ray diffraction and computer simulation, a palmitoyloleoylphosphatidylcholine-cholesterol bilayer (POPC-Chol) was used as a model of a hydrophobic layer of lipids protecting gastric mucosa as POPC and Chol are the main lipids in human mucus. X-ray diffraction data were used to validate the computer model. The aim of the study was to assess potential gastric toxicity of the xanthones by analysing their atomic level interactions with lipids, ions, and water in the lipid bilayer and their effect on the bilayer physicochemical properties. The results show that xanthones have small effect on the bilayer properties except for its rigidity whereas their interactions with water, ions, and lipids depend on their protonation state and for a given state, are similar for all the xanthones. As gastric toxicity of KS2 is low, based on MD simulations one can predict that toxicity of KS1 and KS3 is also low.
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218
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Ferreira AF, Ponte F, Silva R, Rocha-Pereira C, Sousa E, Pinto M, Bastos MDL, Remião F. Quantification of 1-(propan-2-ylamino)-4-propoxy-9H-thioxanthen-9-one (TX5), a newly synthetized P-glycoprotein inducer/activator, in biological samples: method development and validation. Biomed Chromatogr 2016; 31. [PMID: 27465355 DOI: 10.1002/bmc.3802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 06/06/2016] [Accepted: 07/23/2016] [Indexed: 01/23/2023]
Abstract
A simple, rapid and economical method was developed and validated for the analysis and quantification of 1-(propan-2-ylamino)-4-propoxy-9H-thioxanthen-9-one (TX5), a P-glycoprotein inducer/activator, in biological samples, using reverse-phase high-performance liquid chromatography (HPLC). A C18 column and a mobile phase composed of methanol-water (90/10, v/v) with 1% (v/v) triethylamine, at a flow rate of 1 mL/min, were used for chromatographic separation. TX5 standards (0.5-150 μm) were prepared in human serum. Methanol was used for TX5 extraction and serum protein precipitation. After filtration, samples were injected into the HPLC apparatus and TX5 was quantified by a conventional UV detector at 255 nm. The TX5 retention time was 13 min in this isocratic system. The method was validated according to ICH guidelines for specificity/selectivity, linearity, accuracy, precision, limits of detection and quantification (LOD and LOQ) and recovery. The method was proved to be selective, as there were no interferences of endogenous compounds with the same retention time of TX5. Also, the developed method was linear (r2 ≥ 0.99) for TX5 concentrations between 0.5 and 150 μm and the LOD and LOQ were 0.08 and 0.23 μm, respectively. The results indicated that the reported method could meet the requirements for TX5 analysis in the trace amounts expected to be present in biological samples.
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Affiliation(s)
- Ana Filipa Ferreira
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Filipa Ponte
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Renata Silva
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Carolina Rocha-Pereira
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Emília Sousa
- CIIMAR, Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Madalena Pinto
- CIIMAR, Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Maria de Lourdes Bastos
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Fernando Remião
- UCIBIO-REQUIMTE, Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
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219
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Xu WJ, Li RJ, Quasie O, Yang MH, Kong LY, Luo J. Polyprenylated Tetraoxygenated Xanthones from the Roots of Hypericum monogynum and Their Neuroprotective Activities. JOURNAL OF NATURAL PRODUCTS 2016; 79:1971-81. [PMID: 27525351 DOI: 10.1021/acs.jnatprod.6b00251] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Ten new polyprenylated tetraoxygenated xanthones, monogxanthones A-J (1-10), together with eight known analogues (4b, 11-17) were identified from the roots of Hypericum monogynum. The structures of these new polyprenylated xanthones (1-10), a class of compounds rarely found in plants of the genus Hypericum, were elucidated by the interpretation of their HRESIMS, 1D and 2D NMR, and electronic circular dichroism data. Compounds 1 and 2 exhibited neuroprotective effects against corticosterone (Cort)-induced lesions of PC12 cells at concentrations of 6.25, 12.50, and 25.00 μM, with cell viability greater than 75%, as well as inhibitory effects on nitric oxide production in lipopolysaccharide-induced BV2 microglia cells, with IC50 values of 7.47 ± 0.65 and 9.60 ± 0.12 μM, respectively. Collectively, these results shed new light on the potential of polyprenylated xanthones from the genus Hypericum in the development of antidepression therapies.
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Affiliation(s)
- Wen-Jun Xu
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
| | - Rui-Jun Li
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
| | - Olga Quasie
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
| | - Ming-Hua Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
| | - Ling-Yi Kong
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
| | - Jun Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University , 24 Tong Jia Xiang, Nanjing 210009, People's Republic of China
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220
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Wang R, Chen R, Li J, Liu X, Xie K, Chen D, Peng Y, Dai J. Regiospecific Prenylation of Hydroxyxanthones by a Plant Flavonoid Prenyltransferase. JOURNAL OF NATURAL PRODUCTS 2016; 79:2143-7. [PMID: 27466696 DOI: 10.1021/acs.jnatprod.6b00417] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
C-Prenylated xanthones are pharmacologically attractive specialized metabolites that are distributed in plants and microorganisms. The prenylation of xanthones often contributes to the structural diversity and biological activities of these compounds. However, efficient regiospecific prenylation of xanthones is still challenging. In this study, the regiospecific prenylation of a number of structurally different hydroxyxanthones (3-10) by MaIDT, a plant flavonoid prenyltransferase with substrate flexibility from Morus alba, is demonstrated. Among the enzymatic products, 2-dimethylallyl-1,3,7-trihydroxyxanthone (3a) effectively attenuated glutamate-induced injury in SK-N-SH neuroblastoma cells. These results suggest a potential approach for the synthesis of bioactive prenylated xanthones by a substrate-relaxed flavonoid prenyltransferase.
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Affiliation(s)
- Ruishan Wang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Ridao Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Jianhua Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Xiao Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Kebo Xie
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Dawei Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Ying Peng
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
| | - Jungui Dai
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines and ‡Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences , Beijing 100050, People's Republic of China
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221
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Hardman-Baldwin AM, Visco MD, Wieting JM, Stern C, Kondo SI, Mattson AE. Silanediol-Catalyzed Chromenone Functionalization. Org Lett 2016; 18:3766-9. [PMID: 27453257 DOI: 10.1021/acs.orglett.6b01783] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Promising levels of enantiocontrol are observed in the silanediol-catalyzed addition of silyl ketene acetals to benzopyrylium triflates. This rare example of enantioselective, intermolecular chromenone functionalization with carbonyl-containing nucleophiles has potential applications in the synthesis of bioactive chromanones and tetrahydroxanthones.
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Affiliation(s)
- Andrea M Hardman-Baldwin
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Michael D Visco
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Joshua M Wieting
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Charlotte Stern
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Shin-Ichi Kondo
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Anita E Mattson
- Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
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222
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Li F, Guo W, Che Q, Zhu T, Gu Q, Li D. Versicones E–H and arugosin K produced by the mangrove-derived fungus Aspergillus versicolor HDN11-84. J Antibiot (Tokyo) 2016; 70:174-178. [DOI: 10.1038/ja.2016.95] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 06/12/2016] [Accepted: 06/22/2016] [Indexed: 11/09/2022]
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223
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Cheng X, Zhou Y, Zhang F, Zhu K, Liu Y, Li Y. Base-Promoted Tandem Reaction Involving Insertion into Carbon-Carbon σ-Bonds: Synthesis of Xanthone and Chromone Derivatives. Chemistry 2016; 22:12655-9. [DOI: 10.1002/chem.201602064] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 12/20/2022]
Affiliation(s)
- Xingcan Cheng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Yuanyuan Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Fangfang Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Kai Zhu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Yuanyuan Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Yanzhong Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
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224
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Santos CMM, Pinto DCGA, Silva VLM, Silva AMS. Arylxanthones and arylacridones: a synthetic overview. PURE APPL CHEM 2016. [DOI: 10.1515/pac-2016-0407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
AbstractArylxanthones and arylacridones although not yet found in nature are becoming an important group of heterocyclic compounds due to their promising biological activities. Their central cores, xanthone and acridone, are recognized as interesting motifs for drug development mainly to be used in antitumour chemotherapy. The synthesis of this type of compounds is still scarce but several successful examples were recently published and a large variety of arylated xanthone and acridone derivatives were prepared. A systematic survey of the literature dedicated to their synthesis will be presented and discussed in this review.
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Affiliation(s)
- Clementina M. M. Santos
- 1Department of Chemistry and QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
- 2School of Agriculture, Polytechnic Institute of Bragança, 5300-253 Bragança, Portugal
| | - Diana C. G. A. Pinto
- 1Department of Chemistry and QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Vera L. M. Silva
- 1Department of Chemistry and QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Artur M. S. Silva
- 1Department of Chemistry and QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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225
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Xu M, Heidmarsson S, Olafsdottir ES, Buonfiglio R, Kogej T, Omarsdottir S. Secondary metabolites from cetrarioid lichens: Chemotaxonomy, biological activities and pharmaceutical potential. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2016; 23:441-459. [PMID: 27064003 DOI: 10.1016/j.phymed.2016.02.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 02/16/2016] [Accepted: 02/17/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Lichens, as a symbiotic association of photobionts and mycobionts, display an unmatched environmental adaptability and a great chemical diversity. As an important morphological group, cetrarioid lichens are one of the most studied lichen taxa for their phylogeny, secondary chemistry, bioactivities and uses in folk medicines, especially the lichen Cetraria islandica. However, insufficient structure elucidation and discrepancy in bioactivity results could be found in a few studies. PURPOSE This review aimed to present a more detailed and updated overview of the knowledge of secondary metabolites from cetrarioid lichens in a critical manner, highlighting their potentials for pharmaceuticals as well as other applications. Here we also highlight the uses of molecular phylogenetics, metabolomics and ChemGPS-NP model for future bioprospecting, taxonomy and drug screening to accelerate applications of those lichen substances. CHAPTERS The paper starts with a short introduction in to the studies of lichen secondary metabolites, the biological classification of cetrarioid lichens and the aim. In light of ethnic uses of cetrarioid lichens for therapeutic purposes, molecular phylogeny is proposed as a tool for future bioprospecting of cetrarioid lichens, followed by a brief discussion of the taxonomic value of lichen substances. Then a delicate description of the bioactivities, patents, updated chemical structures and lichen sources is presented, where lichen substances are grouped by their chemical structures and discussed about their bioactivity in comparison with reference compounds. To accelerate the discovery of bioactivities and potential drug targets of lichen substances, the application of the ChemGPS NP model is highlighted. Finally the safety concerns of lichen substances (i.e. toxicity and immunogenicity) and future-prospects in the field are exhibited. CONCLUSION While the ethnic uses of cetrarioid lichens and the pharmaceutical potential of their secondary metabolites have been recognized, the knowledge of a large number of lichen substances with interesting structures is still limited to various in vitro assays with insufficient biological annotations, and this area still deserves more research in bioactivity, drug targets and screening. Attention should be paid on the accurate interpretation of their bioactivity for further applications avoiding over-interpretations from various in vitro bioassays.
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Affiliation(s)
- Maonian Xu
- Faculty of Pharmaceutical Sciences, University of Iceland, Hagi, Hofsvallagata 53, IS-107 Reykjavik, Iceland
| | - Starri Heidmarsson
- Icelandic Institute of Natural History, Akureyri Division, IS-600 Akureyri, Iceland
| | - Elin Soffia Olafsdottir
- Faculty of Pharmaceutical Sciences, University of Iceland, Hagi, Hofsvallagata 53, IS-107 Reykjavik, Iceland
| | - Rosa Buonfiglio
- Chemistry Innovation Centre, Discovery Sciences, AstraZeneca R&D Mölndal, Pepparedsleden 1, Mölndal SE-43183, Sweden
| | - Thierry Kogej
- Chemistry Innovation Centre, Discovery Sciences, AstraZeneca R&D Mölndal, Pepparedsleden 1, Mölndal SE-43183, Sweden
| | - Sesselja Omarsdottir
- Faculty of Pharmaceutical Sciences, University of Iceland, Hagi, Hofsvallagata 53, IS-107 Reykjavik, Iceland.
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Bifunctional CYP81AA proteins catalyse identical hydroxylations but alternative regioselective phenol couplings in plant xanthone biosynthesis. Nat Commun 2016; 7:11472. [PMID: 27145837 PMCID: PMC4858744 DOI: 10.1038/ncomms11472] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 03/30/2016] [Indexed: 01/01/2023] Open
Abstract
Xanthones are natural products present in plants and microorganisms. In plants, their biosynthesis starts with regioselective cyclization of 2,3′,4,6-tetrahydroxybenzophenone to either 1,3,5- or 1,3,7-trihydroxyxanthones, catalysed by cytochrome P450 (CYP) enzymes. Here we isolate and express CYP81AA-coding sequences from Hypericum calycinum and H. perforatum in yeast. Microsomes catalyse two consecutive reactions, that is, 3′-hydroxylation of 2,4,6-trihydroxybenzophenone and C–O phenol coupling of the resulting 2,3′,4,6-tetrahydroxybenzophenone. Relative to the inserted 3′-hydroxyl, the orthologues Hc/HpCYP81AA1 cyclize via the para position to form 1,3,7-trihydroxyxanthone, whereas the paralogue HpCYP81AA2 directs cyclization to the ortho position, yielding the isomeric 1,3,5-trihydroxyxanthone. Homology modelling and reciprocal mutagenesis reveal the impact of S375, L378 and A483 on controlling the regioselectivity of HpCYP81AA2, which is converted into HpCYP81AA1 by sextuple mutation. However, the reciprocal mutations in HpCYP81AA1 barely affect its regiospecificity. Product docking rationalizes the alternative C–O phenol coupling reactions. Our results help understand the machinery of bifunctional CYPs. Xanthones are pharmacologically and biosynthetically intriguing compounds. Here, the authors identify two cytochrome P450 enzymes, which hydroxylate and cyclize the benzophenone precursor to either 1,3,7- or 1,3,5-trihydroxyxanthones, and pinpoint residues that determine the alternative regioselectivities.
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Valletta A, De Angelis G, Badiali C, Brasili E, Miccheli A, Di Cocco ME, Pasqua G. Acetic acid acts as an elicitor exerting a chitosan-like effect on xanthone biosynthesis in Hypericum perforatum L. root cultures. PLANT CELL REPORTS 2016; 35:1009-1020. [PMID: 26795145 DOI: 10.1007/s00299-016-1934-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 12/17/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
Acetic acid acts as a signal molecule, strongly enhancing xanthone biosynthesis in Hypericum perforatum root cultures. This activity is specific, as demonstrated by the comparison with other short-chain monocarboxylic acids. We have recently demonstrated that Hypericum perforatum root cultures constitutively produce xanthones at higher levels than the root of the plant and that they respond to chitosan (CHIT) elicitation with a noteworthy increase in xanthone production. In the present study, CHIT was administered to H. perforatum root cultures using three different elicitation protocols, and the increase in xanthone production was evaluated. The best results (550 % xanthone increase) were obtained by subjecting the roots to a single elicitation with 200 mg l(-1) CHIT and maintaining the elicitor in the culture medium for 7 days. To discriminate the effect of CHIT from that of the solvent, control experiments were performed by administering AcOH alone at the same concentration used for CHIT solubilization. Unexpectedly, AcOH caused an increase in xanthone production comparable to that observed in response to CHIT. Feeding experiments with (13)C-labeled AcOH demonstrated that this compound was not incorporated into the xanthone skeleton. Other short-chain monocarboxylic acids (i.e., propionic and butyric acid) have little or no effect on the production of xanthones. These results indicate that AcOH acts as a specific signal molecule, able to greatly enhance xanthone biosynthesis in H. perforatum root cultures.
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Affiliation(s)
- Alessio Valletta
- Department of Environmental Biology, Sapienza University of Rome, Rome, Italy.
| | - Giulia De Angelis
- Department of Environmental Biology, Sapienza University of Rome, Rome, Italy
| | - Camilla Badiali
- Department of Environmental Biology, Sapienza University of Rome, Rome, Italy
| | - Elisa Brasili
- Department of Environmental Biology, Sapienza University of Rome, Rome, Italy
| | - Alfredo Miccheli
- Department of Chemistry, Sapienza University of Rome, Rome, Italy
| | | | - Gabriella Pasqua
- Department of Environmental Biology, Sapienza University of Rome, Rome, Italy
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228
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Alcaide B, Almendros P, Martín-Montero R, Ruiz MP. Allene-Based Gold-Catalyzed Stereodivergent Synthesis of Azapolycyclic Derivatives of Unusual Structure. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201501145] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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229
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Neubauer L, Dopstadt J, Humpf HU, Tudzynski P. Identification and characterization of the ergochrome gene cluster in the plant pathogenic fungus Claviceps purpurea. Fungal Biol Biotechnol 2016; 3:2. [PMID: 28955461 PMCID: PMC5611617 DOI: 10.1186/s40694-016-0020-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/16/2016] [Indexed: 11/30/2022] Open
Abstract
Background Claviceps purpurea is a phytopathogenic fungus infecting a broad range of grasses including economically important cereal crop plants. The infection cycle ends with the formation of the typical purple-black pigmented sclerotia containing the toxic ergot alkaloids. Besides these ergot alkaloids little is known about the secondary metabolism of the fungus. Red anthraquinone derivatives and yellow xanthone dimers (ergochromes) have been isolated from sclerotia and described as ergot pigments, but the corresponding gene cluster has remained unknown. Fungal pigments gain increasing interest for example as environmentally friendly alternatives to existing dyes. Furthermore, several pigments show biological activities and may have some pharmaceutical value. Results This study identified the gene cluster responsible for the synthesis of the ergot pigments. Overexpression of the cluster-specific transcription factor led to activation of the gene cluster and to the production of several known ergot pigments. Knock out of the cluster key enzyme, a nonreducing polyketide synthase, clearly showed that this cluster is responsible for the production of red anthraquinones as well as yellow ergochromes. Furthermore, a tentative biosynthetic pathway for the ergot pigments is proposed. By changing the culture conditions, pigment production was activated in axenic culture so that high concentration of phosphate and low concentration of sucrose induced pigment syntheses. Conclusions This is the first functional analysis of a secondary metabolite gene cluster in the ergot fungus besides that for the classical ergot alkaloids. We demonstrated that this gene cluster is responsible for the typical purple-black color of the ergot sclerotia and showed that the red and yellow ergot pigments are products of the same biosynthetic pathway. Activation of the gene cluster in axenic culture opened up new possibilities for biotechnological applications like the dye production or the development of new pharmaceuticals. Electronic supplementary material The online version of this article (doi:10.1186/s40694-016-0020-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lisa Neubauer
- Institute of Plant Biology and Biotechnology, Westfälische Wilhelms-Universität Münster, Schlossplatz 8, 48143 Münster, Germany
| | - Julian Dopstadt
- Institute of Food Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 45, 48149 Münster, Germany
| | - Hans-Ulrich Humpf
- Institute of Food Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 45, 48149 Münster, Germany
| | - Paul Tudzynski
- Institute of Plant Biology and Biotechnology, Westfälische Wilhelms-Universität Münster, Schlossplatz 8, 48143 Münster, Germany
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230
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Le Pogam P, Boustie J. Xanthones of Lichen Source: A 2016 Update. Molecules 2016; 21:294. [PMID: 26950106 PMCID: PMC6273661 DOI: 10.3390/molecules21030294] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 02/21/2016] [Accepted: 02/23/2016] [Indexed: 11/23/2022] Open
Abstract
An update of xanthones encountered in lichens is proposed as more than 20 new xanthones have been described since the publication of the compendium of lichen metabolites by Huneck and Yoshimura in 1996. The last decades witnessed major advances regarding the elucidation of biosynthetic schemes leading to these fascinating compounds, accounting for the unique substitution patterns of a very vast majority of lichen xanthones. Besides a comprehensive analysis of the structures of xanthones described in lichens, their bioactivities and the emerging analytical strategies used to pinpoint them within lichens are presented here together with physico-chemical properties (including NMR data) as reported since 1996.
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Affiliation(s)
- Pierre Le Pogam
- Laboratoire de Pharmacognosie, Equipe PNSCM, (ISCR UMR CNRS 6226), Faculté des Sciences Pharmaceutiques et Biologiques, 2 Avenue du Professeur Léon Bernard, 35043, Rennes Cédex, France.
| | - Joël Boustie
- Laboratoire de Pharmacognosie, Equipe PNSCM, (ISCR UMR CNRS 6226), Faculté des Sciences Pharmaceutiques et Biologiques, 2 Avenue du Professeur Léon Bernard, 35043, Rennes Cédex, France.
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231
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Asperdichrome, an unusual dimer of tetrahydroxanthone through an ether bond, with protein tyrosine phosphatase 1B inhibitory activity, from the Okinawan freshwater Aspergillus sp. TPU1343. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2015.12.111] [Citation(s) in RCA: 18] [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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232
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Qin T, Iwata T, Ransom TT, Beutler JA, Porco JA. Syntheses of Dimeric Tetrahydroxanthones with Varied Linkages: Investigation of "Shapeshifting" Properties. J Am Chem Soc 2015; 137:15225-33. [PMID: 26544765 PMCID: PMC4863954 DOI: 10.1021/jacs.5b09825] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The 2,4'- and 4,4'-linked variants of the cytotoxic agent secalonic acid A and their analogues have been synthesized. Kinetic resolution of an unprotected tetrahydroxanthone scaffold followed by copper-mediated biaryl coupling allowed for efficient access to these compounds. Evaluation of the "shapeshifting" properties of 2,2'-, 2,4'-, and 4,4'-linked variants of the secalonic acids A in a polar solvent in conjunction with assays of the compounds against select cancer cell lines was conducted to study possible correlations between linkage variation and cytotoxicity.
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Affiliation(s)
- Tian Qin
- Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Takayuki Iwata
- Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Tanya T. Ransom
- Molecular Targets Laboratory, Frederick National Laboratory for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
| | - John A. Beutler
- Molecular Targets Laboratory, Frederick National Laboratory for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
| | - John A. Porco
- Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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233
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Wu G, Yu G, Kurtán T, Mándi A, Peng J, Mo X, Liu M, Li H, Sun X, Li J, Zhu T, Gu Q, Li D. Versixanthones A-F, Cytotoxic Xanthone-Chromanone Dimers from the Marine-Derived Fungus Aspergillus versicolor HDN1009. JOURNAL OF NATURAL PRODUCTS 2015; 78:2691-2698. [PMID: 26506221 DOI: 10.1021/acs.jnatprod.5b00636] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Six unusual xanthone-chromanone dimers, versixanthones A-F (1-6), featuring different formal linkages of tetrahydroxanthone and 2,2-disubstituted chroman-4-one monomers, were isolated from a culture of the mangrove-derived fungus Aspergillus versicolor HDN1009. The absolute configurations of 1-6, representing the central and axial chirality elements or preferred helicities, were established by a combination of X-ray diffraction analysis, chemical conversions, and TDDFT-ECD calculations. The interconversion of different biaryl linkages between 1 and 4 and between 2 and 3 in DMSO by a retro-oxa-Michael mechanism provided insight into the formation of the xanthone-chromanone dimers and supported the assignments of their absolute configurations. Compounds 1-6 exhibited cytotoxicities against the seven tested cancer cell lines, with the best IC50 value of 0.7 μM. Compound 5 showed further inhibitory activity against topoisomerase I.
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Affiliation(s)
- Guangwei Wu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Guihong Yu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen , POB 20, 4010 Debrecen, Hungary
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen , POB 20, 4010 Debrecen, Hungary
| | - Jixing Peng
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Xiaomei Mo
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Ming Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Hui Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Xinhua Sun
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Jing Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Tianjiao Zhu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Qianqun Gu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
| | - Dehai Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao, Shandong 266003, People's Republic of China
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234
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Zhang Z, Gao Y, Liu Y, Li J, Xie H, Li H, Wang W. Organocatalytic Aerobic Oxidation of Benzylic sp3 C–H Bonds of Ethers and Alkylarenes Promoted by a Recyclable TEMPO Catalyst. Org Lett 2015; 17:5492-5. [DOI: 10.1021/acs.orglett.5b02877] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Zhiguang Zhang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Yuan Gao
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Yuan Liu
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Jianjun Li
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Hexin Xie
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Hao Li
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Wei Wang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
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235
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Lindner S, Nieger M, Bräse S. Stannylation and Stille Coupling of Base-Sensitive Tetrahydroxanthones to Heteromeric Biaryls. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500524] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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236
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Ganapathy D, Reiner JR, Löffler LE, Ma L, Gnanaprakasam B, Niepötter B, Koehne I, Tietze LF. Enantioselective Total Synthesis of Secalonic Acid E. Chemistry 2015; 21:16807-10. [DOI: 10.1002/chem.201503593] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Indexed: 11/10/2022]
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237
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238
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Rafiński Z, Kozakiewicz A. Enantioselective Synthesis of Chromanones Bearing Quaternary Substituted Stereocenters Catalyzed by (1R)-Camphor-Derived N-Heterocyclic Carbenes. J Org Chem 2015; 80:7468-76. [PMID: 26161638 DOI: 10.1021/acs.joc.5b01029] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A catalytic asymmetric intramolecular crossed-benzoin reaction for the synthesis of chromanones by novel camphor-derived N-heterocyclic carbenes is described. The corresponding chromanones bearing quaternary stereogenic centers were isolated in high yields with high to excellent enantioselectivity.
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Affiliation(s)
- Zbigniew Rafiński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Street, 87-100 Toruń, Poland
| | - Anna Kozakiewicz
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7 Gagarin Street, 87-100 Toruń, Poland
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239
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Tietze LF, Waldecker B, Ganapathy D, Eichhorst C, Lenzer T, Oum K, Reichmann SO, Stalke D. Four- and Sixfold Tandem-Domino Reactions Leading to Dimeric Tetrasubstituted Alkenes Suitable as Molecular Switches. Angew Chem Int Ed Engl 2015; 54:10317-21. [DOI: 10.1002/anie.201503538] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Indexed: 01/17/2023]
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240
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Tietze LF, Waldecker B, Ganapathy D, Eichhorst C, Lenzer T, Oum K, Reichmann SO, Stalke D. Vier- und sechsfache Tandem-Dominoreaktionen zur Synthese von dimeren tetrasubstituierten Alkenen als molekulare Doppelschalter. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503538] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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241
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242
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Bornadiego A, Díaz J, Marcos CF. Regioselective Tandem [4 + 1]–[4 + 2] Synthesis of Amino-Substituted Dihydroxanthones and Xanthones. J Org Chem 2015; 80:6165-72. [DOI: 10.1021/acs.joc.5b00658] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ana Bornadiego
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), School of Veterinary Sciences, University of Extremadura, 10071 Cáceres, Spain
| | - Jesús Díaz
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), School of Veterinary Sciences, University of Extremadura, 10071 Cáceres, Spain
| | - Carlos F. Marcos
- Laboratory of Bioorganic Chemistry & Membrane Biophysics (L.O.B.O.), School of Veterinary Sciences, University of Extremadura, 10071 Cáceres, Spain
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243
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Zhuang YB, Yin H, Zhang XW, Zhou W, Liu T. Three New Xanthones from the FungusPenicilliumsp. NH-7-1. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201400296] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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244
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Wagner D, Bräse S. Ruthenium-catalyzed C-H activation of thioxanthones. Beilstein J Org Chem 2015; 11:431-6. [PMID: 25977717 PMCID: PMC4419513 DOI: 10.3762/bjoc.11.49] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 03/14/2015] [Indexed: 01/30/2023] Open
Abstract
Thioxanthones - being readily available in one step from thiosalicylic acid and arenes - were used in ruthenium-catalyzed C-H-activation reaction to produce 1-mono- or 1,8-disubstituted thioxanthones in good to excellent yields. Scope and limitation of this reaction are presented.
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Affiliation(s)
- Danny Wagner
- Department of Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Stefan Bräse
- Department of Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Campus North, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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245
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Bessa LJ, Palmeira A, Gomes AS, Vasconcelos V, Sousa E, Pinto M, Martins da Costa P. Synergistic Effects Between Thioxanthones and Oxacillin Against Methicillin-Resistant Staphylococcus aureus. Microb Drug Resist 2015; 21:404-15. [PMID: 25789724 DOI: 10.1089/mdr.2014.0162] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The extensive use of antimicrobials is leaving medicine with few effective therapeutic options to treat many infections due to the fact that many organisms developed resistance to commonly used drugs. It is therefore pertinent to search not only for new antimicrobials but also for compounds able to restore or potentiate the activity of existing antibiotics. We have screened a library consisting of 40 (thio)xanthone derivatives for antibacterial activity and possible synergistic effects when used in combination with antibiotics. Nine out of the 40 compounds exhibited antibacterial activity against Gram-positive bacteria. Two xanthone derivatives, 1-formyl-4-hydroxy-3-methoxy (7), 2-formyl-3-hydroxy-4-methoxyxanthone (8) and the thioxanthone derivative 1-((2-(diethylamino)ethyl)amino)-4-propoxythioxanthone (10) and its hydrochloride form 13, showed activity against a methicillin-resistant Staphylococcus aureus (MRSA) isolate with minimum inhibitory concentration (MIC) values lower than 256 μg/ml. Thioxanthone 10 demonstrated antibacterial activity and also synergy when combined with ampicillin and oxacillin against MRSA. Additionally, thioxanthone 1-(piperidin-1-yl)-4-propoxythioxanthone (9), despite not having antibacterial activity presented remarkable synergy with oxacillin against MRSA; the MIC of tioxanthone 9 and oxacillin when both were in combination were 128 and 8 μg/ml, respectively. Thioxanthones 9 and 10 were also found to be synergistic when both were combined. Subsequently, docking simulations between thioxanthones 9 and 10 and the allosteric domain of penicillin-binding protein 2A (PBP2A) were undertaken in AutoDock Vina. Both compounds had the ability to bind with an allosteric domain of PBP2A, which may explain their synergy with oxacillin. These two thioxanthone derivatives with different profiles may be promising tools for restoring the activity of oxacillin against MRSA.
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Affiliation(s)
- Lucinda J Bessa
- 1 Laboratório de Microbiologia e Tecnologia Alimentar, Departamento de Produção Aquática, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto , Porto, Portugal .,2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal
| | - Andreia Palmeira
- 3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Ana S Gomes
- 3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Vitor Vasconcelos
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,4 Departamento de Biologia, Faculdade de Ciências, Universidade do Porto , Porto, Portugal
| | - Emília Sousa
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Madalena Pinto
- 2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal .,3 Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Centro de Química Medicinal da Universidade do Porto (CEQUIMED-UP), Universidade do Porto , Porto, Portugal
| | - Paulo Martins da Costa
- 1 Laboratório de Microbiologia e Tecnologia Alimentar, Departamento de Produção Aquática, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto , Porto, Portugal .,2 Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto , Porto, Portugal
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246
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Schmidt B, Elizarov N, Schilde U, Kelling A. Dual Role of Acetanilides: Traceless Removal of a Directing Group through Deacetylation/Diazotation and Palladium-Catalyzed C-C-Coupling Reactions. J Org Chem 2015; 80:4223-34. [PMID: 25700158 DOI: 10.1021/acs.joc.5b00272] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The acetamide group enables regioselective oxidative ortho-C-H activation reactions, such as Pd-catalyzed acylation. The synthetic utility of these transformations can be significantly enhanced by using the acetamide as a quasi-leaving group in a subsequent conventional Pd-catalyzed coupling or cross-coupling reaction. The concept is illustrated herein for the synthesis of o-alkenyl- and o-arylphenones, which have potential for the synthesis of arylated aromatic heterocycles.
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Affiliation(s)
- Bernd Schmidt
- Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Nelli Elizarov
- Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Uwe Schilde
- Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Alexandra Kelling
- Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
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247
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Qin T, Skraba-Joiner SL, Khalil ZG, Johnson RP, Capon RJ, Porco JA. Atropselective syntheses of (-) and (+) rugulotrosin A utilizing point-to-axial chirality transfer. Nat Chem 2015; 7:234-40. [PMID: 25698333 PMCID: PMC4339264 DOI: 10.1038/nchem.2173] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 12/16/2014] [Indexed: 02/05/2023]
Abstract
Chiral, dimeric natural products containing complex structures and interesting biological properties have inspired chemists and biologists for decades. A seven step total synthesis of the axially chiral, dimeric tetrahydroxanthone natural product rugulotrosin A is described. The synthesis employs a one-pot Suzuki coupling/dimerization to generate the requisite 2,2'-linked biaryl linkage. Highly selective point-to-axial chirality transfer was achieved using palladium catalysis with achiral phosphine ligands. Single X-ray crystal diffraction data was obtained to confirm both the atropisomeric configuration and absolute stereochemistry of rugulotrosin A. Computational studies are described to rationalize the atropselectivity observed in the key dimerization step. Comparison of the crude fungal extract with synthetic rugulotros in A and its atropisomer verified that nature generates a single atropisomer of the natural product.
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Affiliation(s)
- Tian Qin
- Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, Boston, Massachusetts 02215, USA
| | - Sarah L Skraba-Joiner
- Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824, USA
| | - Zeinab G Khalil
- The University of Queensland, Institute of Molecular Bioscience, 306 Carmody Road, St Lucia, Queensland 4072, Australia
| | - Richard P Johnson
- Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824, USA
| | - Robert J Capon
- The University of Queensland, Institute of Molecular Bioscience, 306 Carmody Road, St Lucia, Queensland 4072, Australia
| | - John A Porco
- Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, Boston, Massachusetts 02215, USA
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248
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Kaya M, Halıcı MG, Duman F, Erdoğan S, Baran T. Characterisation of α-chitin extracted from a lichenised fungus species Xanthoria parietina. Nat Prod Res 2015; 29:1280-4. [DOI: 10.1080/14786419.2014.995651] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Murat Kaya
- Department of Biotechnology and Molecular Biology, Faculty of Science and Letters, Aksaray University, 68100 Aksaray, Turkey
- Science and Technology Application and Research Center, Aksaray University, 68100 Aksaray, Turkey
| | - Mehmet Gökhan Halıcı
- Department of Biology, Faculty of Science, Erciyes University, 38039 Kayseri, Turkey
| | - Fatih Duman
- Department of Biology, Faculty of Science, Erciyes University, 38039 Kayseri, Turkey
| | - Sevil Erdoğan
- Fisheries Programme, Ke¸an Vocational College, Trakya University, 22800 Ke¸an, Edirne, Turkey
| | - Talat Baran
- Department of Chemistry, Faculty of Science and Letters, Aksaray University, 68100 Aksaray, Turkey
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249
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El-Elimat T, Figueroa M, Raja HA, Graf TN, Swanson SM, Falkinham JO, Wani MC, Pearce CJ, Oberlies NH. Biosynthetically Distinct Cytotoxic Polyketides from Setophoma terrestris.. European J Org Chem 2015; 2015:109-121. [PMID: 25574154 PMCID: PMC4283843 DOI: 10.1002/ejoc.201402984] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Indexed: 11/09/2022]
Abstract
Sixteen polyketides belonging to diverse structural classes, including monomeric/dimeric tetrahydroxanthones and resorcylic acid lactones, were isolated from an organic extract of a fungal culture Setophoma terrestris (MSX45109) using bioactivity-directed fractionation as part of a search for anticancer leads from filamentous fungi. Of these, six were new: penicillixanthone B (5), blennolide H (6), 11-deoxy blennolide D (7), blennolide I (9), blennolide J (10), and pyrenomycin (16). The known compounds were: secalonic acid A (1), secalonic acid E (2), secalonic acid G (3), penicillixanthone A (4), paecilin B (8), aigialomycin A (11), hypothemycin (12), dihydrohypothemycin (13), pyrenochaetic acid C (14), and nidulalin B (15). The structures were elucidated using a set of spectroscopic and spectrometric techniques; the absolute configurations of compounds 1-10 were determined using ECD spectroscopy combined with time-dependent density functional theory (TDDFT) calculations, while a modified Mosher's ester method was used for compound 16. The cytotoxic activities of compounds (1-15) were evaluated using the MDA-MB-435 (melanoma) and SW-620 (colon) cancer cell lines. Compounds 1, 4, and 12 were the most potent with IC50 values ranging from 0.16 to 2.14 μM. When tested against a panel of bacteria and fungi, compounds 3 and 5 showed promising activity against the Gram-positive bacterium Micrococcus luteus with MIC values of 5 and 15 μg/mL, respectively.
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Affiliation(s)
- Tamam El-Elimat
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, United States, Homepage: http://www.uncg.edu/che/Group_Research_Page/NicholasOberlies
| | - Mario Figueroa
- Facultad de Química, Universidad Nacional Autónoma de México Mexico DF 04510, Mexico
| | - Huzefa A. Raja
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, United States, Homepage: http://www.uncg.edu/che/Group_Research_Page/NicholasOberlies
| | - Tyler N. Graf
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, United States, Homepage: http://www.uncg.edu/che/Group_Research_Page/NicholasOberlies
| | - Steven M. Swanson
- Department of Medicinal Chemistry and Pharmacognosy University of Illinois at Chicago, Chicago, IL 60612, United States
| | - Joseph O. Falkinham
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States
| | - Mansukh C. Wani
- Natural Products Laboratory, Research Triangle Institute, Research Triangle Park NC 27709 United States
| | | | - Nicholas H. Oberlies
- Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC 27402, United States, Homepage: http://www.uncg.edu/che/Group_Research_Page/NicholasOberlies
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250
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Song GP, Li SM, Si HZ, Li YB, Li YS, Fan JH, Liang QQ, He HB, Ye HM, Cui ZN. Synthesis and bioactivity of novel xanthone and thioxanthone l-rhamnopyranosides. RSC Adv 2015. [DOI: 10.1039/c5ra02846a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Xanthone l-rhamnopyranoside derivative 11 was discovered as one of novel topo-I inhibitors.
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