1
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Chen C, Chen X, Ren B, Guo H, Abdel-Mageed WM, Liu X, Song F, Zhang L. Characterization of Streptomyces sp. LS462 with high productivity of echinomycin, a potent antituberculosis and synergistic antifungal antibiotic. J Ind Microbiol Biotechnol 2021; 48:kuab079. [PMID: 34661655 PMCID: PMC8788810 DOI: 10.1093/jimb/kuab079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 10/12/2021] [Indexed: 02/05/2023]
Abstract
A biologically active microbial strain, designated as "LS462," was isolated from a soil sample collected from Yaoli Virgin Forest of Jiangxi Province, China. The strain was able to produce a high yield of echinomycin (172 mg/l) even under nonoptimized culture conditions and is proposed to serve as a promising source of echinomycin. In this study, echinomycin exhibited strong anti-Mycobacterium tuberculosis H37Rv activity and synergistic antifungal effect with a greatly reduced dosage of posaconazole on Candida albicans SC5314. The strain belongs to the genus Streptomyces according to its morphological and 16S rDNA phylogenetic analysis. The 16S rDNA was found to have the highest sequence identity with Streptomyces fuscichromogenes (99.37% similarity). Extensive nuclear magnetic resonance and mass spectroscopic data were used to determine the structure of echinomycin. The strain S. fuscichromogenes has not been previously reported to produce echinomycin. Strain LS462 may be exploited as a new potential source for the commercial production of echinomycin. Also, this work is the first to report the new synergistic antifungal activity of echinomycin and further study of the synergistic mechanism will be helpful to guide the development of antifungal agents.
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Affiliation(s)
- Caixia Chen
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Xiangyin Chen
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Biao Ren
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- West China Hospital of Stomatology, Sichuan University, Sichuan 610041, P. R. China
| | - Hui Guo
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- Institute of Biophysics, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Wael M Abdel-Mageed
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Xueting Liu
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Fuhang Song
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- School of Light Industry, Beijing Technology and Business University, Beijing 100048, P. R. China
| | - Lixin Zhang
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai 200237, P. R. China
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2
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Long F, Cheung CY, Whitman WB, Cook GM, Ronimus RS. Using genome comparisons of wild-type and resistant mutants of Methanococcus maripaludis to help understand mechanisms of resistance to methane inhibitors. Access Microbiol 2021; 3:000244. [PMID: 34595395 PMCID: PMC8479958 DOI: 10.1099/acmi.0.000244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 06/08/2021] [Indexed: 11/24/2022] Open
Abstract
Methane emissions from enteric fermentation in the ruminant digestive system generated by methanogenic archaea are a significant contributor to anthropogenic greenhouse gas emissions. Additionally, methane produced as an end-product of enteric fermentation is an energy loss from digested feed. To control the methane emissions from ruminants, extensive research in the last decades has been focused on developing viable enteric methane mitigation practices, particularly, using methanogen-specific inhibitors. We report here the utilization of two known inhibitors of methanogenic archaea, neomycin and chloroform, together with a recently identified inhibitor, echinomycin, to produce resistant mutants of Methanococcus maripaludis S2 and S0001. Whole-genome sequencing at high coverage (> 100-fold) was performed subsequently to investigate the potential targets of these inhibitors at the genomic level. Upon analysis of the whole-genome sequencing data, we identified mutations in a number of genetic loci pointing to potential mechanisms of inhibitor action and their underlying mechanisms of resistance.
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Affiliation(s)
- Feng Long
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
- Present address: Department of Inflammation and Immunity, Cleveland Clinic, Cleveland, OH, USA
| | - Chen-Yi Cheung
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - William B Whitman
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | - Gregory M Cook
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Ron S Ronimus
- Rumen Microbiology, AgResearch Ltd., Palmerston North, New Zealand
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3
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Fujioka H. Development of New Innovative Synthetic Organic Chemistry Using Lone Pairs of Oxygen Atoms. Chem Pharm Bull (Tokyo) 2020; 68:907-945. [PMID: 32999145 DOI: 10.1248/cpb.c20-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxygen atoms have a lone pair of electrons, so they have high chelation ability, high nucleophilic ability, stabilizing ability of adjacent cations, and take a chelate or oxocarbenium ion structure with Lewis acids and metals. I took advantage of these properties to develop three new reactions, 1) asymmetric synthesis of chiral quaternary carbon centers, 2) asymmetric synthesis using acetal functions, and 3) organic chemistry using acetal-type reactive salt chemical species, and applied them to biologically active natural products synthesis. New reactions described here are all innovative and useful for natural products synthesis. In particular, the first asymmetric synthesis of fredericamycin A, and concise asymmetric synthesis of anthracycline antibiotics, scyphostatin, (+)-Sch 642305, (-)-stenine, clavolonine, (+)-rubrenolide, (+)-rubrynolide, (+)-centrolobine, and decytospolide A and B, etc., are noteworthy. Furthermore, since reactions using acetal-type reactive salt chemical species allow the coexistence of functional groups that normally cannot coexist, the reactions using reactive salts have potential to change the retrosynthesis planned based on conventional reactions.
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Affiliation(s)
- Hiromichi Fujioka
- The Institute of Scientific and Industrial Research, Osaka University
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4
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Trenti F, Lebe KE, Adelin E, Ouazzani J, Schotte C, Cox RJ. Investigating the biosynthesis of Sch-642305 in the fungus Phomopsis sp. CMU-LMA. RSC Adv 2020; 10:27369-27376. [PMID: 35516937 PMCID: PMC9055631 DOI: 10.1039/d0ra05311b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 07/16/2020] [Indexed: 11/21/2022] Open
Abstract
The biosynthetic pathway of the fungal metabolite Sch-642305 was determined by a series of knockout and heterologous expression experiments.
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Affiliation(s)
- Francesco Trenti
- Institute for Organic Chemistry and BMWZ
- Leibniz Universität Hannover
- Hannover
- Germany
| | - Karen E. Lebe
- Institute for Organic Chemistry and BMWZ
- Leibniz Universität Hannover
- Hannover
- Germany
| | - Emilie Adelin
- Centre National de la Recherche Scientifique
- Institut de Chimie des Substances Naturelles ICSN
- Gif-sur-Yvette
- France
| | - Jamal Ouazzani
- Centre National de la Recherche Scientifique
- Institut de Chimie des Substances Naturelles ICSN
- Gif-sur-Yvette
- France
| | - Carsten Schotte
- Institute for Organic Chemistry and BMWZ
- Leibniz Universität Hannover
- Hannover
- Germany
| | - Russell J. Cox
- Institute for Organic Chemistry and BMWZ
- Leibniz Universität Hannover
- Hannover
- Germany
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5
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Park YS, Shin WS, Kim CS, Ahn CM, Qi XF, Kim SK. Molecular and cellular toxicological profiling of DNA bis-intercalator, quinoxaline compounds: echinomycin as the versatile lead. Mol Cell Toxicol 2018. [DOI: 10.1007/s13273-018-0002-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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6
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Yuyama KT, Fortkamp D, Abraham WR. Eremophilane-type sesquiterpenes from fungi and their medicinal potential. Biol Chem 2017; 399:13-28. [PMID: 28822220 DOI: 10.1515/hsz-2017-0171] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/09/2017] [Indexed: 01/26/2023]
Abstract
Eremophilanes are sesquiterpenes with a rearranged carbon skeleton formed both by plants and fungi, however, almost no plant eremophilanes are found in fungi. These eremophilanes possess mainly phytotoxic, antimicrobial, anticancer and immunomodulatory properties and in this review fungal eremophilanes with bioactivities of potential medicinal applications are reviewed and discussed. A special focus is set on natural products bearing highly functionalized fatty acids at C-1 or C-3 position of the eremophilane backbone. Many of these fatty acids seem to contribute to the bioactivity of the metabolites enhancing the activity of the sesquiterpene moieties. Several approaches for optimization of these natural products for clinical needs and testing of the resulting derivatives are presented and discussed. The combination of identification of bioactive natural products with their subsequent improvement using a variety of genetical or chemical tools and the pharmacokinetic assessment of the products is presented here as a promising approach to new drugs.
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Affiliation(s)
- Kamila Tomoko Yuyama
- Helmholtz Center for Infection Research, Chemical Microbiology, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
| | - Diana Fortkamp
- Helmholtz Center for Infection Research, Chemical Microbiology, Inhoffenstrasse 7, D-38124 Braunschweig, Germany.,Escola Superior de Agricultura 'Luiz de Queiroz' (ESALQ), Department of Exact Sciences, Piracicaba, SP, Brazil
| | - Wolf-Rainer Abraham
- Helmholtz Center for Infection Research, Chemical Microbiology, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
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7
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Shen W, Mao H, Huang Q, Dong J. Benzenediol lactones: a class of fungal metabolites with diverse structural features and biological activities. Eur J Med Chem 2015; 97:747-77. [DOI: 10.1016/j.ejmech.2014.11.067] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 11/04/2014] [Accepted: 11/26/2014] [Indexed: 12/12/2022]
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8
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Expanding the species and chemical diversity of Penicillium section Cinnamopurpurea. PLoS One 2015; 10:e0121987. [PMID: 25853891 PMCID: PMC4390383 DOI: 10.1371/journal.pone.0121987] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 02/06/2015] [Indexed: 11/19/2022] Open
Abstract
A set of isolates very similar to or potentially conspecific with an unidentified Penicillium isolate NRRL 735, was assembled using a BLAST search of ITS similarity among described (GenBank) and undescribed Penicillium isolates in our laboratories. DNA was amplified from six loci of the assembled isolates and sequenced. Two species in section Cinnamopurpurea are self-compatible sexual species, but the asexual species had polymorphic loci suggestive of sexual reproduction and variation in conidium size suggestive of ploidy level differences typical of heterothallism. Accordingly we use genealogical concordance analysis, a technique valid only in heterothallic organisms, for putatively asexual species. Seven new species were revealed in the analysis and are described here. Extrolite analysis showed that two of the new species, P. colei and P. monsserratidens produce the mycotoxin citreoviridin that has demonstrated pharmacological activity against human lung tumors. These isolates could provide leads in pharmaceutical research.
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9
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Fernández J, Marín L, Alvarez-Alonso R, Redondo S, Carvajal J, Villamizar G, Villar CJ, Lombó F. Biosynthetic modularity rules in the bisintercalator family of antitumor compounds. Mar Drugs 2014; 12:2668-99. [PMID: 24821625 PMCID: PMC4052310 DOI: 10.3390/md12052668] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 04/09/2014] [Accepted: 04/11/2014] [Indexed: 12/05/2022] Open
Abstract
Diverse actinomycetes produce a family of structurally and biosynthetically related non-ribosomal peptide compounds which belong to the chromodepsipeptide family. These compounds act as bisintercalators into the DNA helix. They give rise to antitumor, antiparasitic, antibacterial and antiviral bioactivities. These compounds show a high degree of conserved modularity (chromophores, number and type of amino acids). This modularity and their high sequence similarities at the genetic level imply a common biosynthetic origin for these pathways. Here, we describe insights about rules governing this modular biosynthesis, taking advantage of the fact that nowadays five of these gene clusters have been made public (thiocoraline, triostin, SW-163 and echinomycin/quinomycin). This modularity has potential application for designing and producing novel genetic engineered derivatives, as well as for developing new chemical synthesis strategies. These would facilitate their clinical development.
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Affiliation(s)
- Javier Fernández
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Laura Marín
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Raquel Alvarez-Alonso
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Saúl Redondo
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Juan Carvajal
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Germán Villamizar
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Claudio J Villar
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
| | - Felipe Lombó
- Research Group BITTEN, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Universidad de Oviedo, C/Julián Clavería 7, Facultad de Medicina, Oviedo 33006, Spain.
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10
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Adelin E, Martin MT, Bricot MF, Cortial S, Retailleau P, Ouazzani J. Biotransformation of natural compounds: unexpected thio conjugation of Sch-642305 with 3-mercaptolactate catalyzed by Aspergillus niger ATCC 16404 cells. PHYTOCHEMISTRY 2012; 84:135-140. [PMID: 22975164 DOI: 10.1016/j.phytochem.2012.08.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 08/06/2012] [Accepted: 08/11/2012] [Indexed: 06/01/2023]
Abstract
Sch-642305 is produced by the endophytic fungi Phomopsis sp. CMU-LMA and exhibits both antimicrobial and cytotoxic activities. The incubation of Sch-642305 with Aspergillus niger ATCC 16404 resting cells leads to two unexpected thio conjugates. Compound (1) is formed by the addition of the cysteine metabolite 3-mercaptolactate to the double bond of Sch-642305. Compound (1) undergoes an intramolecular rearrangement to give compound (2), which contains two rings: a five-membered hydroxylactone ring and a five-membered thiophene ring. The absolute configuration of compound (1) is similar to that of the parent compound, but the configuration of the mercaptolactate side-chain was not determined. The absolute configuration of compound (2) was deduced from the crystal structure and confirmed by the anomal effect of the sulfur atom. To the best of our knowledge, this is the first time such a conjugation rearrangement reactions were observed. The biological significance and the reaction mechanisms are discussed. Compound (1) exhibits a weak antimicrobial activity against Gram-positive bacteria, whereas derivatives (1) and (2) showed an IC₅₀ of 1 and 1.2 μM, respectively, against colonic epithelial cancer cells.
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Affiliation(s)
- Emilie Adelin
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles ICSN, Centre National de la Recherche Scientifique C.N.R.S., Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
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11
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Strategies to Block HIV Transcription: Focus on Small Molecule Tat Inhibitors. BIOLOGY 2012; 1:668-97. [PMID: 24832514 PMCID: PMC4009808 DOI: 10.3390/biology1030668] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 11/06/2012] [Accepted: 11/07/2012] [Indexed: 01/29/2023]
Abstract
After entry into the target cell, the human immunodeficiency virus type I (HIV) integrates into the host genome and becomes a proviral eukaryotic transcriptional unit. Transcriptional regulation of provirus gene expression is critical for HIV replication. Basal transcription from the integrated HIV promoter is very low in the absence of the HIV transactivator of transcription (Tat) protein and is solely dependent on cellular transcription factors. The 5' terminal region (+1 to +59) of all HIV mRNAs forms an identical stem-bulge-loop structure called the Transactivation Responsive (TAR) element. Once Tat is made, it binds to TAR and drastically activates transcription from the HIV LTR promoter. Mutations in either the Tat protein or TAR sequence usually affect HIV replication, indicating a strong requirement for their conservation. The necessity of the Tat-mediated transactivation cascade for robust HIV replication renders Tat one of the most desirable targets for transcriptional therapy against HIV replication. Screening based on inhibition of the Tat-TAR interaction has identified a number of potential compounds, but none of them are currently used as therapeutics, partly because these agents are not easily delivered for an efficient therapy, emphasizing the need for small molecule compounds. Here we will give an overview of the different strategies used to inhibit HIV transcription and review the current repertoire of small molecular weight compounds that target HIV transcription.
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12
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Marco JA, Carda M. Stereoselective Synthesis of Five Biologically Active, Naturally Occurring Medium and Large Ring Lactones. Nat Prod Commun 2011. [DOI: 10.1177/1934578x1100600411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Stereoselective syntheses of five naturally occurring, pharmacologically active medium and large ring lactones are described. Key synthetic methods used were, depending on the cases, olefin metatheses, asymmetric allylations and C-glycosidations.
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Affiliation(s)
- J. Alberto Marco
- Depart. de Q. Orgánica, Univ. de Valencia, 46100 Burjassot, Valencia, Spain
| | - Miguel Carda
- Depart. de Q. Inorgánica y Orgánica, Univ. Jaume I, 12071 Castellón, Spain
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13
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Dermenci A, Selig PS, Domaoal RA, Spasov KA, Anderson KS, Miller SJ. Quasi-Biomimetic Ring Contraction Catalyzed by a Cysteine-Based Nucleophile: Total Synthesis of Sch-642305, Some Analogs and their Putative anti-HIV Activities. Chem Sci 2011; 2. [PMID: 24179673 DOI: 10.1039/c1sc00221j] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cysteine plays a number of important functional and structural roles in Nature, often in the realm of catalysis. Herein, we present an example of a cysteine-catalyzed Rauhut-Currier reaction for a potentially biomimetic synthesis of Sch-642305 and related analogs. In this key step of the synthesis we discuss interesting new discoveries and the importance of substrate-catalyst recognition, as well as cysteine's structural features. Also, we investigate the activity of Sch-642305 and four analogs in HIV-infected T-cells.
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Affiliation(s)
- Alpay Dermenci
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06520 -8107 (USA)
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14
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Affiliation(s)
- Inder Pal Singh
- Department of Natural Products, National Institute of Pharmaceutical Education and Research (NIPER), Sector-67, S.A.S. Nagar, Punjab 160062, India.
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15
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A radical mediated approach to the stereoselective formal total synthesis of (+)-Sch 642305. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Pfoh R, Cuesta-Seijo JA, Sheldrick GM. Interaction of an echinomycin-DNA complex with manganese ions. Acta Crystallogr Sect F Struct Biol Cryst Commun 2009; 65:660-4. [PMID: 19574634 PMCID: PMC2705629 DOI: 10.1107/s1744309109019654] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2009] [Accepted: 05/23/2009] [Indexed: 11/10/2022]
Abstract
The crystal structure of an echinomycin-d(ACGTACGT) duplex interacting with manganese(II) was solved by Mn-SAD using in-house data and refined to 1.1 A resolution against synchrotron data. This complex crystallizes in a different space group compared with related complexes and shows a different mode of base pairing next to the bis-intercalation site, suggesting that the energy difference between Hoogsteen and Watson-Crick pairing is rather small. The binding of manganese to N7 of guanine is only possible because of DNA unwinding induced by the echinomycin, which might help to explain the mode of action of the drug.
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Affiliation(s)
- Roland Pfoh
- Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Jose A. Cuesta-Seijo
- Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - George M. Sheldrick
- Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
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17
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García-Fortanet J, Carda M, Alberto Marco J. Stereoselective synthesis of the bacterial DNA primase inhibitor Sch 642305 and its C-4 epimer. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.09.080] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Fujioka H, Ohba Y, Nakahara K, Takatsuji M, Murai K, Ito M, Kita Y. New Perspective for Natural Products Synthesis: Concise Synthesis of (+)-Sch 642305 by Chiral Auxiliary Multiuse Methodology. Org Lett 2007; 9:5605-8. [DOI: 10.1021/ol702530b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yusuke Ohba
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kenji Nakahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Mayuko Takatsuji
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Motoki Ito
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yasuyuki Kita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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19
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Dong J, Zhu Y, Song H, Li R, He H, Liu H, Huang R, Zhou Y, Wang L, Cao Y, Zhang K. Nematicidal Resorcylides from the Aquatic Fungus Caryospora callicarpa YMF1.01026. J Chem Ecol 2007; 33:1115-26. [PMID: 17393283 DOI: 10.1007/s10886-007-9256-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2006] [Revised: 01/19/2007] [Accepted: 01/29/2007] [Indexed: 10/23/2022]
Abstract
This study investigated metabolites with activities against plant parasite nematodes from the fresh-water fungus Caryospora callicarpa YMF1.01026. We obtained three novel tetradecalactone metabolites, caryospomycins A-C, with such activities. The chemical structures of these were determined through NMR spectroscopic analysis and were found to belong to the 14-membered macrolides with a fused 1,2-dimethoxy-4-hydroxybenzene ring, a rare structure among the resorcylides. In the in vitro tests, all three compounds exhibited moderate killing activity against the nematode Bursaphelenchus xylophilus. To our knowledge, this is the first report of secondary metabolites in the aquatic fungal genus Caryospora.
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Affiliation(s)
- Jinyan Dong
- Key Laboratory for Conservation and Utilization of Bio-Resources, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
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20
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Wilson EM, Trauner D. Concise synthesis of the bacterial DNA primase inhibitor (+) -Sch 642305. Org Lett 2007; 9:1327-9. [PMID: 17338537 DOI: 10.1021/ol070173u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[structure: see text]. A highly convergent, enantioselective synthesis of (+) -Sch 642305 is presented, which features a Mukaiyama-Michael addition followed by allylation to establish the syn-anti relationship of the three contiguous stereocenters. The 10-membered macrolactone was formed through ring-closing metathesis.
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Affiliation(s)
- Erica M Wilson
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
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21
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Kumar P, Naidu V, Gupta P. Application of hydrolytic kinetic resolution (HKR) in the synthesis of bioactive compounds. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.12.015] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Sørensen D, Raditsis A, Trimble LA, Blackwell BA, Sumarah MW, Miller JD. Isolation and structure elucidation by LC-MS-SPE/NMR: PR toxin- and cuspidatol-related eremophilane sesquiterpenes from Penicillium roqueforti. JOURNAL OF NATURAL PRODUCTS 2007; 70:121-3. [PMID: 17253863 DOI: 10.1021/np060454v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Three eremophilane sesquiterpenes (1, 2, and 3) were isolated from Penicillium roqueforti DAOM 232127, and their structures were established. The new (3S)-3-acetoxyeremophil-1(2),7(11),9(10)-trien-8-one (3) is a likely biosynthetic precursor of PR toxin. 1-Hydroxyeremophil-7(11),9(10)-dien-8-one (1) is related to the immunosuppressant cuspidatol. The application of semihyphenated LC-MS-SPE/NMR to rapidly identify, purify, and elucidate the structures of 1, 2, and 3 is described.
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Affiliation(s)
- Dan Sørensen
- Merck Frosst Centre for Therapeutic Research, Merck Frosst Canada Ltd., 16711 Trans Canada Highway, Kirkland, Québec, H9H 3L1, Canada.
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23
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Abstract
[reaction: see text] The synthesis of (+)-Sch 642305 (1) has been completed in 17 steps in 1.6% overall yield. Transannular Michael reaction of 2b with NaH in THF provided cyclohexenone 23 stereospecifically. Heating 23 in TFA/CDCl(3) provided a 3:1 equilibrium mixture of 23 and 25, which was hydrolyzed to give (+)-6-epi-Sch 642305 (24) and (+)-Sch 642305 (1), respectively.
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24
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25
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Enantioselective synthesis of epi-(+)-Sch 642305: observation of an interesting diastereoselection during RCM. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.07.152] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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26
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Mehta G, Shinde HM. Enantioselective total synthesis of bioactive natural product (+)-Sch 642305: a structurally novel inhibitor of bacterial DNA primase and HIV-1 Tat transactivation. Chem Commun (Camb) 2005:3703-5. [PMID: 16027917 DOI: 10.1039/b505264e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The total synthesis of the bioactive natural product (+)-Sch 642305 has been achieved from a readily available chiral building block using an RCM protocol to construct the key decalactone moiety; our approach is notable for its built-in flexibility and is diversity oriented.
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Affiliation(s)
- Goverdhan Mehta
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, India.
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