101
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Wang C, Wen D, Chen H, Deng Y, Liu X, Liu X, Wang L, Gao F, Guo Y, Sun M, Wang K, Yan W. The catalytic asymmetric synthesis of CF3-containing spiro-oxindole–pyrrolidine–pyrazolone compounds through squaramide-catalyzed 1,3-dipolar cycloaddition. Org Biomol Chem 2019; 17:5514-5519. [DOI: 10.1039/c9ob00720b] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Pharmaceutically important compounds were synthesized through the organocatalytic 1,3-dipolar cycloaddition reaction.
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102
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Cheng L, Kang X, Wang D, Gao Y, Yi L, Xi Z. The one-pot nonhydrolysis Staudinger reaction and Staudinger or SPAAC ligation. Org Biomol Chem 2019; 17:5675-5679. [DOI: 10.1039/c9ob00528e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The one-pot nonhydrolysis Staudinger reaction and Staudinger or SPAAC ligation were used for producing a FRET-based dyad in living cells as a proof-of-concept study.
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Affiliation(s)
- Longhuai Cheng
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology
- National Engineering Research Center of Pesticide (Tianjin)
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Xueying Kang
- State Key Laboratory of Organic–Inorganic Composites and Beijing Key Laboratory of Bioprocess
- Beijing University of Chemical Technology (BUCT)
- Beijing 100029
- China
| | - Dan Wang
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology
- National Engineering Research Center of Pesticide (Tianjin)
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Yasi Gao
- State Key Laboratory of Organic–Inorganic Composites and Beijing Key Laboratory of Bioprocess
- Beijing University of Chemical Technology (BUCT)
- Beijing 100029
- China
| | - Long Yi
- State Key Laboratory of Organic–Inorganic Composites and Beijing Key Laboratory of Bioprocess
- Beijing University of Chemical Technology (BUCT)
- Beijing 100029
- China
- Collaborative Innovation Center of Chemical Science and Engineering
| | - Zhen Xi
- State Key Laboratory of Elemento-Organic Chemistry and Department of Chemical Biology
- National Engineering Research Center of Pesticide (Tianjin)
- College of Chemistry
- Nankai University
- Tianjin 300071
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103
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Swetha Y, Reddy ER, Kumar JR, Trivedi R, Giribabu L, Sridhar B, Rathod B, Prakasham RS. Synthesis, characterization and antimicrobial evaluation of ferrocene–oxime ether benzyl 1H-1,2,3-triazole hybrids. NEW J CHEM 2019. [DOI: 10.1039/c9nj00660e] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A series of ferrocene–oxime ether benzyl 1H-1,2,3 triazole hybrids has been synthesized by employing Cu(i) catalyzed azide–alkyne [3+2] cycloaddition reaction and their antibacterial and antifungal activities are reported.
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Affiliation(s)
- Yagnam Swetha
- Catalysis and Fine Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Eda Rami Reddy
- Catalysis and Fine Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Department of Chemistry
| | - Jakku Ranjith Kumar
- Catalysis and Fine Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Rajiv Trivedi
- Catalysis and Fine Chemicals Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Lingamallu Giribabu
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-IICT Campus
- Hyderabad 500007
- India
- Polymer and Functional Materials Division
| | - Balasubramanian Sridhar
- Centre for X-ray Crystallography
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Balaji Rathod
- Organic Synthesis and Process Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Reddy Shetty Prakasham
- Organic Synthesis and Process Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
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104
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Dumont E, Vergalli J, Pajovic J, Bhamidimarri SP, Morante K, Wang J, Lubriks D, Suna E, Stavenger RA, Winterhalter M, Réfrégiers M, Pagès JM. Mechanistic aspects of maltotriose-conjugate translocation to the Gram-negative bacteria cytoplasm. Life Sci Alliance 2018; 2:e201800242. [PMID: 30620010 PMCID: PMC6311466 DOI: 10.26508/lsa.201800242] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 12/19/2018] [Accepted: 12/19/2018] [Indexed: 12/24/2022] Open
Abstract
Small molecule accumulation in Gram-negative bacteria is a key challenge to discover novel antibiotics, because of their two membranes and efflux pumps expelling toxic molecules. An approach to overcome this challenge is to hijack uptake pathways so that bacterial transporters shuttle the antibiotic to the cytoplasm. Here, we have characterized maltodextrin-fluorophore conjugates that can pass through both the outer and inner membranes mediated by components of the Escherichia coli maltose regulon. Single-channel electrophysiology recording demonstrated that the compounds permeate across the LamB channel leading to accumulation in the periplasm. We have also demonstrated that a maltotriose conjugate distributes into both the periplasm and cytoplasm. In the cytoplasm, the molecule activates the maltose regulon and triggers the expression of maltose binding protein in the periplasmic space indicating that the complete maltose entry pathway is induced. This maltotriose conjugate can (i) reach the periplasmic and cytoplasmic compartments to significant internal concentrations and (ii) auto-induce its own entry pathway via the activation of the maltose regulon, representing an interesting prototype to deliver molecules to the cytoplasm of Gram-negative bacteria.
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Affiliation(s)
- Estelle Dumont
- Aix Marseille Univ, Institut National de la Santé et de la Recherche Médicale, Service de Santé des Armées, Institut de Recherche Biomédicale des Armées, Membranes et Cibles Thérapeutiques, Marseille, France
| | - Julia Vergalli
- Aix Marseille Univ, Institut National de la Santé et de la Recherche Médicale, Service de Santé des Armées, Institut de Recherche Biomédicale des Armées, Membranes et Cibles Thérapeutiques, Marseille, France
| | - Jelena Pajovic
- DISCO Beamline, Synchrotron Soleil, Saint-Aubin, France.,University of Belgrade, Faculty of Physics, Belgrade, Serbia
| | - Satya P Bhamidimarri
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Bremen, Germany
| | - Koldo Morante
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Bremen, Germany
| | - Jiajun Wang
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Bremen, Germany
| | | | - Edgars Suna
- Latvian Institute of Organic Synthesis, Riga, Latvia
| | - Robert A Stavenger
- Antibacterial Discovery Performance Unit, Infectious Diseases Discovery, GlaxoSmithKline, Collegeville, PA, USA
| | - Mathias Winterhalter
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Bremen, Germany
| | | | - Jean-Marie Pagès
- Aix Marseille Univ, Institut National de la Santé et de la Recherche Médicale, Service de Santé des Armées, Institut de Recherche Biomédicale des Armées, Membranes et Cibles Thérapeutiques, Marseille, France
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105
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Trottmann F, Franke J, Ishida K, García-Altares M, Hertweck C. A Pair of Bacterial Siderophores Releases and Traps an Intercellular Signal Molecule: An Unusual Case of Natural Nitrone Bioconjugation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811131] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Felix Trottmann
- Department of Biomolecular Chemistry; Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI); Beutenbergstrasse 11a 07745 Jena Germany
| | - Jakob Franke
- Department of Biomolecular Chemistry; Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI); Beutenbergstrasse 11a 07745 Jena Germany
| | - Keishi Ishida
- Department of Biomolecular Chemistry; Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI); Beutenbergstrasse 11a 07745 Jena Germany
| | - María García-Altares
- Department of Biomolecular Chemistry; Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI); Beutenbergstrasse 11a 07745 Jena Germany
| | - Christian Hertweck
- Department of Biomolecular Chemistry; Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI); Beutenbergstrasse 11a 07745 Jena Germany
- Natural Product Chemistry, Faculty of Biological Sciences; Friedrich Schiller University Jena; 07743 Jena Germany
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106
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Trottmann F, Franke J, Ishida K, García-Altares M, Hertweck C. A Pair of Bacterial Siderophores Releases and Traps an Intercellular Signal Molecule: An Unusual Case of Natural Nitrone Bioconjugation. Angew Chem Int Ed Engl 2018; 58:200-204. [PMID: 30375753 DOI: 10.1002/anie.201811131] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Indexed: 01/10/2023]
Abstract
In microbial interactions bacteria employ diverse molecules with specific functions, such as sensing the environment, communication with other microbes or hosts, and conferring virulence. Insights into the molecular basis of bacterial communication are thus of high relevance for ecology and medicine. Targeted gene activation and in vitro studies revealed that the cell-to-cell signaling molecule and disease mediator IQS (aeruginaldehyde) of the human pathogen Pseudomonas aeruginosa and related bacteria derives from the siderophore pyochelin. Addition of IQS to bacterial cultures (Burkholderia thailandensis) showed that the signaling molecule is captured by a congener of another siderophore family, malleobactin, to form a nitrone conjugate (malleonitrone) that is active against the IQS-producer. This study uncovers complex communication processes with derailed siderophore functions, a novel nitrone bioconjugation, and a new type of antibiotic against Gram-negative bacteria.
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Affiliation(s)
- Felix Trottmann
- Department of Biomolecular Chemistry, Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI), Beutenbergstrasse 11a, 07745, Jena, Germany
| | - Jakob Franke
- Department of Biomolecular Chemistry, Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI), Beutenbergstrasse 11a, 07745, Jena, Germany
| | - Keishi Ishida
- Department of Biomolecular Chemistry, Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI), Beutenbergstrasse 11a, 07745, Jena, Germany
| | - María García-Altares
- Department of Biomolecular Chemistry, Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI), Beutenbergstrasse 11a, 07745, Jena, Germany
| | - Christian Hertweck
- Department of Biomolecular Chemistry, Leibniz Institute, for Natural Product Chemistry and Infection Biology (HKI), Beutenbergstrasse 11a, 07745, Jena, Germany.,Natural Product Chemistry, Faculty of Biological Sciences, Friedrich Schiller University Jena, 07743, Jena, Germany
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107
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Discovery of novel NO-releasing celastrol derivatives with Hsp90 inhibition and cytotoxic activities. Eur J Med Chem 2018; 160:1-8. [DOI: 10.1016/j.ejmech.2018.10.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/01/2018] [Accepted: 10/05/2018] [Indexed: 11/19/2022]
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108
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Lakemeyer M, Zhao W, Mandl FA, Hammann P, Sieber SA. Thinking Outside the Box-Novel Antibacterials To Tackle the Resistance Crisis. Angew Chem Int Ed Engl 2018; 57:14440-14475. [PMID: 29939462 DOI: 10.1002/anie.201804971] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Indexed: 12/13/2022]
Abstract
The public view on antibiotics as reliable medicines changed when reports about "resistant superbugs" appeared in the news. While reasons for this resistance development are easily spotted, solutions for re-establishing effective antibiotics are still in their infancy. This Review encompasses several aspects of the antibiotic development pipeline from very early strategies to mature drugs. An interdisciplinary overview is given of methods suitable for mining novel antibiotics and strategies discussed to unravel their modes of action. Select examples of antibiotics recently identified by using these platforms not only illustrate the efficiency of these measures, but also highlight promising clinical candidates with therapeutic potential. Furthermore, the concept of molecules that disarm pathogens by addressing gatekeepers of virulence will be covered. The Review concludes with an evaluation of antibacterials currently in clinical development. Overall, this Review aims to connect select innovative antimicrobial approaches to stimulate interdisciplinary partnerships between chemists from academia and industry.
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Affiliation(s)
- Markus Lakemeyer
- Department of Chemistry, Chair of Organic Chemistry II, Center for Integrated Protein Science (CIPSM), Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Weining Zhao
- Department of Chemistry, Chair of Organic Chemistry II, Center for Integrated Protein Science (CIPSM), Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Franziska A Mandl
- Department of Chemistry, Chair of Organic Chemistry II, Center for Integrated Protein Science (CIPSM), Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Peter Hammann
- R&D Therapeutic Area Infectious Diseases, Sanofi-Aventis (Deutschland) GmbH, Industriepark Höchst, 65926, Frankfurt am Main, Germany
| | - Stephan A Sieber
- Department of Chemistry, Chair of Organic Chemistry II, Center for Integrated Protein Science (CIPSM), Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
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109
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Lakemeyer M, Zhao W, Mandl FA, Hammann P, Sieber SA. Über bisherige Denkweisen hinaus - neue Wirkstoffe zur Überwindung der Antibiotika-Krise. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804971] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Markus Lakemeyer
- Fakultät für Chemie; Lehrstuhl für Organische Chemie II, Center for Integrated Protein Science (CIPSM); Technische Universität München; Lichtenbergstraße 4 85747 Garching Deutschland
| | - Weining Zhao
- Fakultät für Chemie; Lehrstuhl für Organische Chemie II, Center for Integrated Protein Science (CIPSM); Technische Universität München; Lichtenbergstraße 4 85747 Garching Deutschland
| | - Franziska A. Mandl
- Fakultät für Chemie; Lehrstuhl für Organische Chemie II, Center for Integrated Protein Science (CIPSM); Technische Universität München; Lichtenbergstraße 4 85747 Garching Deutschland
| | - Peter Hammann
- R&D Therapeutic Area Infectious Diseases; Sanofi-Aventis (Deutschland) GmbH; Industriepark Höchst 65926 Frankfurt am Main Deutschland
| | - Stephan A. Sieber
- Fakultät für Chemie; Lehrstuhl für Organische Chemie II, Center for Integrated Protein Science (CIPSM); Technische Universität München; Lichtenbergstraße 4 85747 Garching Deutschland
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110
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Sakthivel S, Balamurugan R. Annulation of a Highly Functionalized Diazo Building Block with Indoles under Sc(OTf)3/Rh2(OAc)4 Multicatalysis through Michael Addition/Cyclization Sequence. J Org Chem 2018; 83:12171-12183. [DOI: 10.1021/acs.joc.8b02127] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shanmugam Sakthivel
- School of Chemistry, University of Hyderabad, Gachibowli, Hyderabad 500046, India
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111
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Kang JS, Zhang AL, Faheem M, Zhang CJ, Ai N, Buynak JD, Welsh WJ, Oelschlaeger P. Virtual Screening and Experimental Testing of B1 Metallo-β-lactamase Inhibitors. J Chem Inf Model 2018; 58:1902-1914. [PMID: 30107123 DOI: 10.1021/acs.jcim.8b00133] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The global rise of metallo-β-lactamases (MBLs) is problematic due to their ability to inactivate most β-lactam antibiotics. MBL inhibitors that could be coadministered with and restore the efficacy of β-lactams are highly sought after. In this study, we employ virtual screening of candidate MBL inhibitors without thiols or carboxylates to avoid off-target effects using the Avalanche software package, followed by experimental validation of the selected compounds. As target enzymes, we chose the clinically relevant B1 MBLs NDM-1, IMP-1, and VIM-2. Among 32 compounds selected from an approximately 1.5 million compound library, 6 exhibited IC50 values less than 40 μM against NDM-1 and/or IMP-1. The most potent inhibitors of NDM-1, IMP-1, and VIM-2 had IC50 values of 19 ± 2, 14 ± 1, and 50 ± 20 μM, respectively. While chemically diverse, the most potent inhibitors all contain combinations of hydroxyl, ketone, ester, amide, or sulfonyl groups. Docking studies suggest that these electron-dense moieties are involved in Zn(II) coordination and interaction with protein residues. These novel scaffolds could serve as the basis for further development of MBL inhibitors. A procedure for renaming NDM-1 residues to conform to the class B β-lactamase (BBL) numbering scheme is also included.
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Affiliation(s)
- Joon S Kang
- Department of Pharmaceutical Sciences, College of Pharmacy , Western University of Health Sciences , Pomona , California 91766-1854 , United States.,Department of Biological Sciences , California State Polytechnic University , Pomona , California 91768-2557 , United States
| | - Antonia L Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy , Western University of Health Sciences , Pomona , California 91766-1854 , United States
| | - Mohammad Faheem
- Department of Pharmaceutical Sciences, College of Pharmacy , Western University of Health Sciences , Pomona , California 91766-1854 , United States
| | - Charles J Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy , Western University of Health Sciences , Pomona , California 91766-1854 , United States
| | - Ni Ai
- Pharmaceutical Informatics Institute, School of Pharmaceutical Sciences , Zhejiang University , Zhejiang 31005 , People's Republic of China
| | - John D Buynak
- Department of Chemistry , Southern Methodist University , Dallas , Texas 75275-0314 , United States
| | - William J Welsh
- Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, and Division of Chem Informatics, Biomedical Informatics Shared Resource, Rutgers-Cancer Institute of New Jersey , The State University of New Jersey , Piscataway , New Jersey 08854-8021 , United States
| | - Peter Oelschlaeger
- Department of Pharmaceutical Sciences, College of Pharmacy , Western University of Health Sciences , Pomona , California 91766-1854 , United States
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112
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Schalk I. Siderophore–antibiotic conjugates: exploiting iron uptake to deliver drugs into bacteria. Clin Microbiol Infect 2018; 24:801-802. [DOI: 10.1016/j.cmi.2018.03.037] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/23/2018] [Accepted: 03/27/2018] [Indexed: 11/29/2022]
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113
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Ezelarab HAA, Abbas SH, Hassan HA, Abuo-Rahma GEDA. Recent updates of fluoroquinolones as antibacterial agents. Arch Pharm (Weinheim) 2018; 351:e1800141. [DOI: 10.1002/ardp.201800141] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Hend A. A. Ezelarab
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
| | - Samar H. Abbas
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
| | - Heba A. Hassan
- Faculty of Pharmacy, Department of Medicinal Chemistry; Minia University; Minia Egypt
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114
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Okoh OA, Klahn P. Trimethyl Lock: A Multifunctional Molecular Tool for Drug Delivery, Cellular Imaging, and Stimuli-Responsive Materials. Chembiochem 2018; 19:1668-1694. [PMID: 29888433 DOI: 10.1002/cbic.201800269] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Indexed: 12/13/2022]
Abstract
Trimethyl lock (TML) systems are based on ortho-hydroxydihydrocinnamic acid derivatives displaying increased lactonization reactivity owing to unfavorable steric interactions of three pendant methyl groups, and this leads to the formation of hydrocoumarins. Protection of the phenolic hydroxy function or masking of the reactivity as benzoquinone derivatives prevents lactonization and provides a trigger for controlled release of molecules attached to the carboxylic acid function through amides, esters, or thioesters. Their easy synthesis and possible chemical adaption to several different triggers make TML a highly versatile module for the development of drug-delivery systems, prodrug approaches, cell-imaging tools, molecular tools for supramolecular chemistry, as well as smart stimuliresponsive materials.
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Affiliation(s)
- Okoh Adeyi Okoh
- Institute for Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Philipp Klahn
- Institute for Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
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115
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Huang C, Yang C, Zhang W, Zhang L, De BC, Zhu Y, Jiang X, Fang C, Zhang Q, Yuan CS, Liu HW, Zhang C. Molecular basis of dimer formation during the biosynthesis of benzofluorene-containing atypical angucyclines. Nat Commun 2018; 9:2088. [PMID: 29802272 PMCID: PMC5970136 DOI: 10.1038/s41467-018-04487-z] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/30/2018] [Indexed: 11/30/2022] Open
Abstract
Lomaiviticin A and difluostatin A are benzofluorene-containing aromatic polyketides in the atypical angucycline family. Although these dimeric compounds are potent antitumor agents, how nature constructs their complex structures remains poorly understood. Herein, we report the discovery of a number of fluostatin type dimeric aromatic polyketides with varied C−C and C−N coupling patterns. We also demonstrate that these dimers are not true secondary metabolites, but are instead derived from non-enzymatic deacylation of biosynthetic acyl fluostatins. The non-enzymatic deacylation proceeds via a transient quinone methide like intermediate which facilitates the subsequent C–C/C−N coupled dimerization. Characterization of this unusual property of acyl fluostatins explains how dimerization takes place, and suggests a strategy for the assembly of C–C and C–N coupled aromatic polyketide dimers. Additionally, a deacylase FlsH was identified which may help to prevent accumulation of toxic quinone methides by catalyzing hydrolysis of the acyl group. Benzofluorene-containing angucyclines, bacterial natural compounds with potential use as therapeutics/antibiotics, occur as dimers. Here, the authors elucidated the dimerization mechanism which turned out to work spontaneously, without enzymatic catalysis.
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Affiliation(s)
- Chunshuai Huang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China.,University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Chunfang Yang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Wenjun Zhang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Liping Zhang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Bidhan Chandra De
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China.,University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Yiguang Zhu
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Xiaodong Jiang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China.,University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Chunyan Fang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China.,University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Qingbo Zhang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Cheng-Shan Yuan
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China
| | - Hung-Wen Liu
- Division of Chemical Biology and Medicinal Chemistry, College of Pharmacy and Department of Chemistry, University of Texas at Austin, Austin, TX, 78712, USA.
| | - Changsheng Zhang
- Key Laboratory of Tropical Marine Bio-resources and EcologyGuangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, China.
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116
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Conjugates and nano-delivery of antimicrobial peptides for enhancing therapeutic activity. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2017.12.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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117
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Kloß F, Gerbach S. [Obstacles and perspectives of new antimicrobial concepts within research and development]. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2018; 61:595-605. [PMID: 29594395 DOI: 10.1007/s00103-018-2725-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Antimicrobial resistance (AMR) has developed into a serious problem for the healthcare sector worldwide. Research on fundamentally novel antibiotics has been insufficient for decades and only a few new compounds have reached the market. Thus, the pressure to implement novel and effective concepts for the reduction of infections through problematic pathogens has dramatically increased. This demand has been recognized by politicians and comprehensive national and international funding programs have been launched. A major role of many funding lines is the investigation and development of therapeutics exerting a novel mechanism of action and/or minimizing the frequency of resistance. In addition to the actual clinical pipeline, this article lists selected examples from research and early development with a special focus on antibiotics. Moreover, alternative approaches like antivirulence and phage therapy as well as immunomodulation are summarized. AMR is no longer solely a healthcare policy, but is of societal significance as a whole. A consolidation of infrastructures and public-private partnerships, a reduction of regulatory obstacles and a continuous pursuit of innovations for antimicrobial therapy are urgently needed.
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Affiliation(s)
- Florian Kloß
- Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie - Hans-Knöll-Institut, Beutenbergstr. 11 a, 07745, Jena, Deutschland.
| | - Sina Gerbach
- Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie - Hans-Knöll-Institut, Beutenbergstr. 11 a, 07745, Jena, Deutschland
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118
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Antibiotic Hybrids: the Next Generation of Agents and Adjuvants against Gram-Negative Pathogens? Clin Microbiol Rev 2018. [PMID: 29540434 DOI: 10.1128/cmr.00077-17] [Citation(s) in RCA: 171] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The global incidence of drug-resistant Gram-negative bacillary infections has been increasing, and there is a dire need to develop novel strategies to overcome this problem. Intrinsic resistance in Gram-negative bacteria, such as their protective outer membrane and constitutively overexpressed efflux pumps, is a major survival weapon that renders them refractory to current antibiotics. Several potential avenues to overcome this problem have been at the heart of antibiotic drug discovery in the past few decades. We review some of these strategies, with emphasis on antibiotic hybrids either as stand-alone antibacterial agents or as adjuvants that potentiate a primary antibiotic in Gram-negative bacteria. Antibiotic hybrid is defined in this review as a synthetic construct of two or more pharmacophores belonging to an established agent known to elicit a desired antimicrobial effect. The concepts, advances, and challenges of antibiotic hybrids are elaborated in this article. Moreover, we discuss several antibiotic hybrids that were or are in clinical evaluation. Mechanistic insights into how tobramycin-based antibiotic hybrids are able to potentiate legacy antibiotics in multidrug-resistant Gram-negative bacilli are also highlighted. Antibiotic hybrids indeed have a promising future as a therapeutic strategy to overcome drug resistance in Gram-negative pathogens and/or expand the usefulness of our current antibiotic arsenal.
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119
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Laurent Q, Batchelor LK, Dyson PJ. Applying a Trojan Horse Strategy to Ruthenium Complexes in the Pursuit of Novel Antibacterial Agents. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00885] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Quentin Laurent
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Lucinda K. Batchelor
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Paul J. Dyson
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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120
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Codd R, Richardson-Sanchez T, Telfer TJ, Gotsbacher MP. Advances in the Chemical Biology of Desferrioxamine B. ACS Chem Biol 2018; 13:11-25. [PMID: 29182270 DOI: 10.1021/acschembio.7b00851] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Desferrioxamine B (DFOB) was discovered in the late 1950s as a hydroxamic acid metabolite of the soil bacterium Streptomyces pilosus. The exquisite affinity of DFOB for Fe(III) identified its potential for removing excess iron from patients with transfusion-dependent hemoglobin disorders. Many studies have used semisynthetic chemistry to produce DFOB adducts with new properties and broad-ranging functions. More recent approaches in chemical biology have revealed some nuances of DFOB biosynthesis and discovered new DFOB-derived drugs and radiometal imaging agents. The current and potential applications of DFOB continue to inspire a rich body of chemical biology research focused on this bacterial metabolite.
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Affiliation(s)
- Rachel Codd
- School of Medical Sciences
(Pharmacology), The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Tomas Richardson-Sanchez
- School of Medical Sciences
(Pharmacology), The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Thomas J. Telfer
- School of Medical Sciences
(Pharmacology), The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Michael P. Gotsbacher
- School of Medical Sciences
(Pharmacology), The University of Sydney, Sydney, New South Wales 2006, Australia
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121
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Domalaon R, Yang X, Lyu Y, Zhanel GG, Schweizer F. Polymyxin B 3-Tobramycin Hybrids with Pseudomonas aeruginosa-Selective Antibacterial Activity and Strong Potentiation of Rifampicin, Minocycline, and Vancomycin. ACS Infect Dis 2017; 3:941-954. [PMID: 29045123 DOI: 10.1021/acsinfecdis.7b00145] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
There is an urgent need to develop novel antibacterial agents able to eradicate drug-resistant Gram-negative pathogens such as Pseudomonas aeruginosa. Antimicrobial hybrids have emerged as a promising strategy to combat bacterial resistance, as a stand-alone drug but also as an adjuvant in combination with existing antibiotics. Herein, we report for the first time the synthesis and biological evaluation of polymyxin-aminoglycoside heterodimers composed of polymyxin B3 covalently linked to tobramycin via an aliphatic hydrocarbon linker. The polymyxin B3-tobramycin hybrids demonstrate potent activity against carbapenem-resistant as well as multidrug- or extensively drug-resistant (MDR/XDR) P. aeruginosa clinical isolates. Furthermore, the most potent hybrid was able to synergize with currently used antibiotics against wild-type and MDR/XDR P. aeruginosa but also against Acinetobacter baumannii as well. The promising biological activity described herein warrants additional studies into design and development of new antimicrobial hybrids able to surmount the problem of antimicrobial resistance.
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Affiliation(s)
- Ronald Domalaon
- Department
of Chemistry, Faculty of Science, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Xuan Yang
- Department
of Chemistry, Faculty of Science, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Yinfeng Lyu
- Department
of Chemistry, Faculty of Science, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
- Institute
of Animal Nutrition, Northeast Agricultural University, Harbin, Heilongjiang 150030, P.R. China
| | - George G. Zhanel
- Department
of Medical Microbiology and Infectious Diseases, Rady Faculty of Health
Sciences, University of Manitoba, 727 McDermot Avenue, Winnipeg, Manitoba R3T 1R9, Canada
| | - Frank Schweizer
- Department
of Chemistry, Faculty of Science, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
- Department
of Medical Microbiology and Infectious Diseases, Rady Faculty of Health
Sciences, University of Manitoba, 727 McDermot Avenue, Winnipeg, Manitoba R3T 1R9, Canada
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122
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Mai B, Gao Y, Li M, Wang X, Zhang K, Liu Q, Xu C, Wang P. Photodynamic antimicrobial chemotherapy for Staphylococcus aureus and multidrug-resistant bacterial burn infection in vitro and in vivo. Int J Nanomedicine 2017; 12:5915-5931. [PMID: 28860757 PMCID: PMC5566361 DOI: 10.2147/ijn.s138185] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background and objectives Antibiotic resistance has emerged as one of the most important determinants of outcome in patients with serious infections, along with the virulence of the underlying pathogen. Photodynamic antimicrobial chemotherapy (PACT) has been proposed as an alternative approach for the inactivation of bacteria. This study aims to evaluate the antibacterial effect of sinoporphyrin sodium (DVDMS)-mediated PACT on Staphylococcus aureus and multidrug resistant S. aureus in vitro and in vivo. Materials and methods Bacteria were incubated with DVDMS and exposed to treatment with light. After PACT treatment, colony-forming units were counted to estimate the bactericidal effect. Intracellular reactive oxygen-species production was detected by flow cytometry. Flow cytometry and fluorescence-microscopy detection of bacterial cell-membrane permeability. Enzyme-linked immunosorbent assays were used to determine expression of VEGF, TGFβ1, TNFα, IL6, and bFGF factors in burn infection. Results DVDMS-PACT effectively killed bacterial proliferation. Intracellular ROS levels were enhanced obviously in the PACT-treatment group. SYTO 9 and propidium iodide staining showed a decrease in the ratio of green:red fluorescence intensity in the PACT-treatment group in comparison to the control group. Enzyme-linked immunosorbent-assay results revealed that in the healing process, the expression of bFGF, TGFβ1, and VEGF in the treatment group were higher than in the control group, which inhibited inflammation-factor secretion. In addition, skin-tissue bacteria were reduced after treatment. Conclusion These results indicate that DVDMS-PACT presents significant bactericidal activity and promotes wound healing after burn infections.
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Affiliation(s)
- Bingjie Mai
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Yiru Gao
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Min Li
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Xiaobing Wang
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Kun Zhang
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Quanhong Liu
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
| | - Chuanshan Xu
- School of Chinese Medicine, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong, China
| | - Pan Wang
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education.,National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China, College of Life Sciences, Shaanxi Normal University, Xi'an
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