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Aslam M, Rahman J, Iqbal A, Mujtaba S, Ashok AK, Kaouche FC, Hayat MM, Nisa MU, Ashraf M. Antiurease Activity of Antibiotics: In Vitro, In Silico, Structure Activity Relationship, and MD Simulations of Cephalosporins and Fluoroquinolones. ACS OMEGA 2024; 9:14005-14016. [PMID: 38559955 PMCID: PMC10975586 DOI: 10.1021/acsomega.3c09355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 02/22/2024] [Accepted: 03/01/2024] [Indexed: 04/04/2024]
Abstract
Helicobacter pylori infection is widespread in 50% of the world's population and is associated with gastric ulcers and related disorders that ultimately culminate in gastric cancer. Levofloxacin-based, or clarithromycin-based, triple therapy is frequently used to inhibit the bacterial urease enzyme for the eradication of H. pylori. A comprehensive investigation based on the urease inhibitory profiles of antibiotics and their computational implications is lacking in the scientific literature. The present study was aimed specifically to determine the antiurease activities within the realms of cephalosporins and fluoroquinolones by in vitro methods supported with in silico investigations. The results demonstrate the jack bean urease inhibitory activity of cephalosporins, wherein cefadroxil, cefpodoxime, cefotaxime, and cefaclor displayed inhibitions (IC50 21.35 ± 0.64 to 62.86 ± 0.78 μM) compared with the standard thiourea (IC50 21.25 ± 0.15 μM). Among fluoroquinolones, levofloxacin, ofloxacin, and gemifloxacin (IC50 7.24 ± 0.29 to 16.53 ± 0.85 μM) unveiled remarkable inhibitory profiles. Levofloxacin and ofloxacin exhibited competitive inhibition against the said enzyme. Ciprofloxacin and moxifloxacin displayed weak urease inhibitions. During molecular docking studies, Asp362, Gly279, Arg338, Asn168, Asp223, Gln364, and Met366 were involved in hydrogen bonding in fluoroquinolones, and hydrogen bonding was established with Arg338, His248, Asn168 residues, and metal Ni601 and Ni602 of the enzyme. MD simulations and MMPBSA results demonstrated the existence of significant protein-ligand binding. Overall, these results warrant further investigations into the significance of these active molecules in relation to their inhibitory potential against the targeted urease enzyme.
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Affiliation(s)
- Misbah Aslam
- Institute
of Chemistry, B.J. Campus, The Islamia University
of Bahawalpur, Bahawalpur 36000, Pakistan
| | - Jameel Rahman
- Institute
of Chemistry, B.J. Campus, The Islamia University
of Bahawalpur, Bahawalpur 36000, Pakistan
| | - Ambar Iqbal
- Institute
of Chemistry, B.J. Campus, The Islamia University
of Bahawalpur, Bahawalpur 36000, Pakistan
- Department
of Biochemistry and Molecular Biology, Institute of Biochemistry,
Biotechnology, Bioinformatics (IBBB), B.J. Campus, The Islamia University of Bahawalpur, Bahawalpur 36000, Pakistan
| | - Sara Mujtaba
- Institute
of Chemistry, B.J. Campus, The Islamia University
of Bahawalpur, Bahawalpur 36000, Pakistan
| | - Avinash Karkada Ashok
- Department
of Biotechnology, Siddaganga Institute of
Technology, Tumakuru 572103, Karnataka, India
| | - Farah Chafika Kaouche
- Department
of Chemistry, Faculty of Sciences of Mater, Ibn Khaldoun University, BP 78 zaaoura, 14000 Tiaret, Algeria
| | - Muhammad Munawar Hayat
- P
& SH Department, Punjab Drug Testing
Laboratory, 1-Bird Wood
Road, Lahore 631000, Pakistan
| | - Mouqadus-Un Nisa
- Multan Drug
Testing Laboratory, near Multan Institute
of Kidney Disease, Muzaffargarh
Road, Multan 261000, Pakistan
| | - Muhammad Ashraf
- Institute
of Chemistry, B.J. Campus, The Islamia University
of Bahawalpur, Bahawalpur 36000, Pakistan
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2
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Pham NT, Alves J, Sargison FA, Cullum R, Wildenhain J, Fenical W, Butler MS, Mead DA, Duggan BM, Fitzgerald JR, La Clair JJ, Auer M. Nanoscaled Discovery of a Shunt Rifamycin from Salinispora arenicola Using a Three-Color GFP-Tagged Staphylococcus aureus Macrophage Infection Assay. ACS Infect Dis 2023; 9:1499-1507. [PMID: 37433130 PMCID: PMC10425972 DOI: 10.1021/acsinfecdis.3c00049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Indexed: 07/13/2023]
Abstract
Antimicrobial resistance has emerged as a global public health threat, and development of novel therapeutics for treating infections caused by multi-drug resistant bacteria is urgent. Staphylococcus aureus is a major human and animal pathogen, responsible for high levels of morbidity and mortality worldwide. The intracellular survival of S. aureus in macrophages contributes to immune evasion, dissemination, and resilience to antibiotic treatment. Here, we present a confocal fluorescence imaging assay for monitoring macrophage infection by green fluorescent protein (GFP)-tagged S. aureus as a front-line tool to identify antibiotic leads. The assay was employed in combination with nanoscaled chemical analyses to facilitate the discovery of a new, active rifamycin analogue. Our findings indicate a promising new approach for the identification of antimicrobial compounds with macrophage intracellular activity. The antibiotic identified here may represent a useful addition to our armory in tackling the silent pandemic of antimicrobial resistance.
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Affiliation(s)
- Nhan T. Pham
- School
of Biological Sciences, The University of
Edinburgh, The King’s Buildings, Edinburgh EH9 3BF, U.K.
| | - Joana Alves
- The
Roslin Institute, The University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG, U.K.
| | - Fiona A. Sargison
- The
Roslin Institute, The University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG, U.K.
| | - Reiko Cullum
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0204, United
States
| | - Jan Wildenhain
- Exscientia
Oxford Science Park, The Schrödinger Building, Oxford Science Park, Oxford OX4 4GE, U.K.
| | - William Fenical
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0204, United
States
- Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Mark S. Butler
- Xenobe Research Institute, P. O. Box 3052, San Diego, California 92163, United States
| | - David A. Mead
- Terra
Bioforge
Inc., 3220 Deming Way
Suite 100, Middleton, Wisconsin 53562, United States
| | - Brendan M. Duggan
- Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - J. Ross Fitzgerald
- The
Roslin Institute, The University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG, U.K.
| | - James J. La Clair
- Xenobe Research Institute, P. O. Box 3052, San Diego, California 92163, United States
- Department
of Chemistry and Biochemistry, University
of California at San Diego, La
Jolla, California 92093-0358, United States
| | - Manfred Auer
- School
of Biological Sciences, The University of
Edinburgh, The King’s Buildings, Edinburgh EH9 3BF, U.K.
- Xenobe Research Institute, P. O. Box 3052, San Diego, California 92163, United States
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3
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Ribeiro RCB, Ferreira PG, Borges ADA, Forezi LDSM, da Silva FDC, Ferreira VF. 1,2-Naphthoquinone-4-sulfonic acid salts in organic synthesis. Beilstein J Org Chem 2022; 18:53-69. [PMID: 35047082 PMCID: PMC8744465 DOI: 10.3762/bjoc.18.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/15/2021] [Indexed: 12/04/2022] Open
Abstract
Several low molecular weight naphthoquinones are very useful in organic synthesis. These compounds have given rise to thousands of other naphthoquinones that have been tested against various microorganisms and pharmacological targets, including being used in the preparation of several drugs that are on the pharmaceutical market. Among these naphthoquinones, the series of compounds prepared from 1,2-naphthoquinone-4-sulfonic acid salts (β-NQS) stands out. In addition to being used in organic synthesis, they are excellent analytical derivatization reagents to spectrophotometrically determine drugs containing primary and secondary amino groups. This review summarizes the literature involving β-NQS.
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Affiliation(s)
- Ruan Carlos B Ribeiro
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, 24020-150, Niterói-RJ, Brazil
| | - Patricia G Ferreira
- Universidade Federal Fluminense, Faculdade de Farmácia, Departamento de Tecnologia Farmacêutica, 24241-000, Niterói-RJ, Brazil
| | - Amanda de A Borges
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, 24020-150, Niterói-RJ, Brazil
| | - Luana da S M Forezi
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, 24020-150, Niterói-RJ, Brazil
| | - Fernando de Carvalho da Silva
- Universidade Federal Fluminense, Departamento de Química Orgânica, Instituto de Química, Campus do Valonguinho, 24020-150, Niterói-RJ, Brazil
| | - Vitor F Ferreira
- Universidade Federal Fluminense, Faculdade de Farmácia, Departamento de Tecnologia Farmacêutica, 24241-000, Niterói-RJ, Brazil
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4
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Krause J. Applications and Restrictions of Integrated Genomic and Metabolomic Screening: An Accelerator for Drug Discovery from Actinomycetes? Molecules 2021; 26:5450. [PMID: 34576921 PMCID: PMC8471533 DOI: 10.3390/molecules26185450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/06/2021] [Accepted: 09/06/2021] [Indexed: 02/07/2023] Open
Abstract
Since the golden age of antibiotics in the 1950s and 1960s actinomycetes have been the most prolific source for bioactive natural products. However, the number of discoveries of new bioactive compounds decreases since decades. New procedures (e.g., activating strategies or innovative fermentation techniques) were developed to enhance the productivity of actinomycetes. Nevertheless, compound identification remains challenging among others due to high rediscovery rates. Rapid and cheap genome sequencing as well as the advent of bioinformatical analysis tools for biosynthetic gene cluster identification in combination with mass spectrometry-based molecular networking facilitated the tedious process of dereplication. In recent years several studies have been dedicated to accessing the biosynthetic potential of Actinomyces species, especially streptomycetes, by using integrated genomic and metabolomic screening in order to boost the discovery rate of new antibiotics. This review aims to present the various possible applications of this approach as well as the newly discovered molecules, covering studies between 2014 and 2021. Finally, the effectiveness of this approach with regard to find new bioactive agents from actinomycetes will be evaluated.
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Affiliation(s)
- Janina Krause
- Abteilung Biomedizinische Grundlagen 1, Institut für Gesundheitsforschung und Bildung, Universität Osnabrück, 49076 Osnabrück, Germany
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5
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Shi Y, Ye F, Song Y, Zhang X, Lu C, Shen Y. Rifamycin W Analogues from Amycolatopsis mediterranei S699 Δ rif- orf5 Strain. Biomolecules 2021; 11:920. [PMID: 34206314 PMCID: PMC8301457 DOI: 10.3390/biom11070920] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/15/2021] [Accepted: 06/18/2021] [Indexed: 11/16/2022] Open
Abstract
Rifamycin W, the most predominant intermediate in the biosynthesis of rifamycin, needs to undergo polyketide backbone rearrangement to produce rifamycin B via an oxidative cleavage of the C-12/C-29 double bond. However, the mechanism of this putative oxidative cleavage has not been characterized yet. Rif-Orf5 (a putative cytochrome P450 monooxygenase) was proposed to be involved in the cleavage of this olefinic moiety of rifamycin W. In this study, the mutant strain Amycolatopsis mediterranei S699 Δrif-orf5 was constructed by in-frame deleting the rif-orf5 gene to afford thirteen rifamycin W congeners (1-13) including seven new ones (1-7). Their structures were elucidated by extensive analysis of 1D and 2D NMR spectroscopic data and high-resolution ESI mass spectra. Presumably, compounds 1-4 were derivatized from rifamycin W via C-5/C-11 retro-Claisen cleavage, and compounds 1-3, 9 and 10 featured a hemiacetal. Compounds 5-7 and 11 showed oxygenations at various sites of the ansa chain. In addition, compounds 1-3 exhibited antibacterial activity against Staphylococcus aureus with minimal inhibitory concentration (MIC) values of 5, 40 and 0.5 µg/mL, respectively. Compounds 1 and 3 showed modest antiproliferative activity against HeLa and Caco-2 cells with half maximal inhibitory concentration (IC50) values of about 50 µM.
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Affiliation(s)
- Yanrong Shi
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
- Key Laboratory Experimental Teratology of the Ministry of Education, Department of Physiology, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China
| | - Feng Ye
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
| | - Yuliang Song
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
| | - Xiaochun Zhang
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
| | - Chunhua Lu
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
| | - Yuemao Shen
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China; (Y.S.); (F.Y.); (Y.S.); (X.Z.); (C.L.)
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6
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Ye F, Shi Y, Zhao S, Li Z, Wang H, Lu C, Shen Y. 8-Deoxy-Rifamycin Derivatives from Amycolatopsis mediterranei S699 ΔrifT Strain. Biomolecules 2020; 10:biom10091265. [PMID: 32887371 PMCID: PMC7563148 DOI: 10.3390/biom10091265] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/27/2020] [Accepted: 08/31/2020] [Indexed: 02/03/2023] Open
Abstract
Proansamycin X, a hypothetical earliest macrocyclic precursor in the biosynthesis of rifamycin, had never been isolated and identified. According to bioinformatics analysis, it was proposed that RifT (a putative NADH-dependent dehydrogenase) may be a candidate target responsible for the dehydrogenation of proansamycin X. In this study, the mutant strain Amycolatopsis mediterranei S699 ΔrifT was constructed by deleting the rifT gene. From this strain, eleven 8-deoxy-rifamycin derivatives (1–11) and seven known analogues (12–18) were isolated. Their structures were elucidated by extensive analysis of 1D and 2D NMR spectroscopic data and high-resolution ESI mass spectra. Compound 1 is a novel amide N-glycoside of seco-rifamycin. Compounds 2 and 3 feature conserved 11,12-seco-rifamycin W skeleton. The diverse post-modifications in the polyketide chain led to the production of 4–11. Compounds 2, 3, 5, 6, 13 and 15 exhibited antibacterial activity against Staphylococcus aureus (MIC (minimal inhibitory concentration) values of 10, 20, 20, 20, 40 and 20 μg/mL, respectively). Compounds 14, 15, 16, 17 and 18 showed potent antiproliferative activity against KG1 cells with IC50 (half maximal inhibitory concentration) values of 14.91, 44.78, 2.16, 18.67 and 8.07 μM, respectively.
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Affiliation(s)
- Feng Ye
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
| | - Yanrong Shi
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
| | - Shengliang Zhao
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
| | - Zhiying Li
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
| | - Haoxin Wang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China;
| | - Chunhua Lu
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
| | - Yuemao Shen
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, No. 44 West Wenhua Road, Jinan 250012, China; (F.Y.); (Y.S.); (S.Z.); (Z.L.); (C.L.)
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China;
- Correspondence: ; Tel.: +86-531-8838-2108
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7
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Skrzypczak N, Pyta K, Ruszkowski P, Gdaniec M, Bartl F, Przybylski P. Synthesis, structure and anticancer activity of new geldanamycin amine analogs containing C(17)- or C(20)- flexible and rigid arms as well as closed or open ansa-bridges. Eur J Med Chem 2020; 202:112624. [PMID: 32663707 DOI: 10.1016/j.ejmech.2020.112624] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/10/2020] [Accepted: 06/25/2020] [Indexed: 12/15/2022]
Abstract
The nucleophilic attack of amines at C(17) or C(17)/C(20) positions of geldanamycin's (GDM) benzoquinone, via initial 1,4-Michael conjugate addition mechanism, yield new analogs with closed or open ansa-bridges (1-31), respectively. X-ray structures of analogs 22 and 24 reveals an unexpected arrangement of the ansa-bridge in solid (conformer B), that is located between those of conformers A, prevailing in solution (trans-lactam), and C, crucial at binding to Hsp90 (cis-lactam). The structure of a new-type conformer B allows to better understand the molecular recognition mechanism between the GDM analogs and the target Hsp90. Combined analysis of: anticancer test results (SKBR-3, SKOV-3, PC-3, U-87, A-549) and those performed in normal cells (HDF), KD values and docking modes at Hsp90 as well as clogP parameters, reveals that the rigid C(17)-arm (piperidyl, cyclohexyl) with a H-bond acceptor as carbonyl group together with a lipophilicity clogP∼3 favor high potency of analogs, even up to IC50 ∼0.08 μM, at improved selectivity (SIHDF > 30), when compared to GDM. The most active 25 show higher anticancer potency than 17-AAG (in SKOV-3 and A-549) as well as reblastatin (in SKBR-3 and SKOV-3). Opening of the ansa-bridge within GDM analogs, at the best case, decreases activity (IC50∼2 μM) and toxicity in HDF cells (SIHDF∼2-3), relative to GDM.
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Affiliation(s)
- Natalia Skrzypczak
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland
| | - Krystian Pyta
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland
| | - Piotr Ruszkowski
- Department of Pharmacology, University of Medical Sciences, Rokietnicka 5a, 60-806, Poznan, Poland
| | - Maria Gdaniec
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland
| | - Franz Bartl
- Lebenswissenschaftliche Fakultät, Institut für Biologie, Biophysikalische Chemie Humboldt-Universität zu Berlin, Invalidenstrasse 42, 10099, Berlin, Germany
| | - Piotr Przybylski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland.
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8
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Appavoo SD, Huh S, Diaz DB, Yudin AK. Conformational Control of Macrocycles by Remote Structural Modification. Chem Rev 2019; 119:9724-9752. [DOI: 10.1021/acs.chemrev.8b00742] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Solomon D. Appavoo
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada M5S 3H6
| | - Sungjoon Huh
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada M5S 3H6
| | - Diego B. Diaz
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada M5S 3H6
| | - Andrei K. Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada M5S 3H6
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9
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O’Brien FJM, Almaraz M, Foster MA, Hill AF, Huber DP, King EK, Langford H, Lowe MA, Mickan BS, Miller VS, Moore OW, Mathes F, Gleeson D, Leopold M. Soil Salinity and pH Drive Soil Bacterial Community Composition and Diversity Along a Lateritic Slope in the Avon River Critical Zone Observatory, Western Australia. Front Microbiol 2019; 10:1486. [PMID: 31312189 PMCID: PMC6614384 DOI: 10.3389/fmicb.2019.01486] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 06/14/2019] [Indexed: 01/25/2023] Open
Abstract
Soils are crucial in regulating ecosystem processes, such as nutrient cycling, and supporting plant growth. To a large extent, these functions are carried out by highly diverse and dynamic soil microbiomes that are in turn governed by numerous environmental factors including weathering profile and vegetation. In this study, we investigate geophysical and vegetation effects on the microbial communities of iron-rich lateritic soils in the highly weathered landscapes of Western Australia (WA). The study site was a lateritic hillslope in southwestern Australia, where gradual erosion of the duricrust has resulted in the exposure of the different weathering zones. High-throughput amplicon sequencing of the 16S rRNA gene was used to investigate soil bacterial community diversity, composition and functioning. We predicted that shifts in the microbial community would reflect variations in certain edaphic properties associated with the different layers of the lateritic profile and vegetation cover. Our results supported this hypothesis, with electrical conductivity, pH and clay content having the strongest correlation with beta diversity, and many of the differentially abundant taxa belonging to the phyla Actinobacteria and Proteobacteria. Soil water repellence, which is associated with Eucalyptus vegetation, also affected beta diversity. This enhanced understanding of the natural system could help to improve future crop management in WA since the physicochemical properties of the agricultural soils in this region are inherited from laterites via the weathering and pedogenesis processes.
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Affiliation(s)
| | - Maya Almaraz
- National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Melissa A. Foster
- U.S. Bureau of Reclamation, Denver Federal Center, Denver, CO, United States
| | - Alice F. Hill
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, CO, United States
| | - David P. Huber
- Department of Biological Sciences, Idaho State University, Pocatello, ID, United States
| | - Elizabeth K. King
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
| | - Harry Langford
- Department of Geography, The University of Sheffield, Sheffield, United Kingdom
| | - Mary-Anne Lowe
- UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia
| | - Bede S. Mickan
- UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia
| | - Valerie S. Miller
- Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada
| | - Oliver W. Moore
- School of Earth and Environment, University of Leeds, Leeds, United Kingdom
| | - Falko Mathes
- UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia
| | - Deirdre Gleeson
- UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia
| | - Matthias Leopold
- UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia
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10
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Yaghoubi S, Karimi MH, Lotfinia M, Gharibi T, Mahi-Birjand M, Kavi E, Hosseini F, Sineh Sepehr K, Khatami M, Bagheri N, Abdollahpour-Alitappeh M. Potential drugs used in the antibody-drug conjugate (ADC) architecture for cancer therapy. J Cell Physiol 2019; 235:31-64. [PMID: 31215038 DOI: 10.1002/jcp.28967] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 05/20/2019] [Indexed: 01/04/2023]
Abstract
Cytotoxic small-molecule drugs have a major influence on the fate of antibody-drug conjugates (ADCs). An ideal cytotoxic agent should be highly potent, remain stable while linked to ADCs, kill the targeted tumor cell upon internalization and release from the ADCs, and maintain its activity in multidrug-resistant tumor cells. Lessons learned from successful and failed experiences in ADC development resulted in remarkable progress in the discovery and development of novel highly potent small molecules. A better understanding of such small-molecule drugs is important for development of effective ADCs. The present review discusses requirements making a payload appropriate for antitumor ADCs and focuses on the main characteristics of commonly-used cytotoxic payloads that showed acceptable results in clinical trials. In addition, the present study represents emerging trends and recent advances of payloads used in ADCs currently under clinical trials.
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Affiliation(s)
- Sajad Yaghoubi
- Department of Clinical Microbiology, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | | | - Majid Lotfinia
- Physiology Research Center, Kashan University of Medical Sciences, Kashan, Iran.,Core Research Lab, Kashan University of Medical Sciences, Kashan, Iran
| | - Tohid Gharibi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Motahare Mahi-Birjand
- Infectious Disease Research Center, Birjand University of Medical Sciences, Birjand, Iran
| | - Esmaeil Kavi
- Department of Nursing, School of Nursing, Larestan University of Medical Sciences, Larestan, Iran
| | - Fahimeh Hosseini
- Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Koushan Sineh Sepehr
- Laboratory Sciences Research Center, Golestan University of Medical Sciences, Gorgan, Iran
| | - Mehrdad Khatami
- NanoBioelectrochemistry Research Center, Bam University of Medical Sciences, Bam, Iran
| | - Nader Bagheri
- Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
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Chakraborty A, Panda AK, Ghosh R, Roy I, Biswas A. Depicting the DNA binding and photo-nuclease ability of anti-mycobacterial drug rifampicin: A biophysical and molecular docking perspective. Int J Biol Macromol 2019; 127:187-196. [DOI: 10.1016/j.ijbiomac.2019.01.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 11/25/2018] [Accepted: 01/06/2019] [Indexed: 12/13/2022]
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Monserrat-Martinez A, Gambin Y, Sierecki E. Thinking Outside the Bug: Molecular Targets and Strategies to Overcome Antibiotic Resistance. Int J Mol Sci 2019; 20:ijms20061255. [PMID: 30871132 PMCID: PMC6470534 DOI: 10.3390/ijms20061255] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/04/2019] [Accepted: 03/04/2019] [Indexed: 12/25/2022] Open
Abstract
Since their discovery in the early 20th century, antibiotics have been used as the primary weapon against bacterial infections. Due to their prophylactic effect, they are also used as part of the cocktail of drugs given to treat complex diseases such as cancer or during surgery, in order to prevent infection. This has resulted in a decrease of mortality from infectious diseases and an increase in life expectancy in the last 100 years. However, as a consequence of administering antibiotics broadly to the population and sometimes misusing them, antibiotic-resistant bacteria have appeared. The emergence of resistant strains is a global health threat to humanity. Highly-resistant bacteria like Staphylococcus aureus (methicillin-resistant) or Enterococcus faecium (vancomycin-resistant) have led to complications in intensive care units, increasing medical costs and putting patient lives at risk. The appearance of these resistant strains together with the difficulty in finding new antimicrobials has alarmed the scientific community. Most of the strategies currently employed to develop new antibiotics point towards novel approaches for drug design based on prodrugs or rational design of new molecules. However, targeting crucial bacterial processes by these means will keep creating evolutionary pressure towards drug resistance. In this review, we discuss antibiotic resistance and new options for antibiotic discovery, focusing in particular on new alternatives aiming to disarm the bacteria or empower the host to avoid disease onset.
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Affiliation(s)
- Ana Monserrat-Martinez
- European Molecular Biology Laboratory Australia (EMBL Australia) Node in Single Molecule Science, Sydney, NSW 2031, Australia.
- School of Medical Sciences, The University of New South Wales, Sydney, NSW 2031, Australia.
| | - Yann Gambin
- European Molecular Biology Laboratory Australia (EMBL Australia) Node in Single Molecule Science, Sydney, NSW 2031, Australia.
- School of Medical Sciences, The University of New South Wales, Sydney, NSW 2031, Australia.
| | - Emma Sierecki
- European Molecular Biology Laboratory Australia (EMBL Australia) Node in Single Molecule Science, Sydney, NSW 2031, Australia.
- School of Medical Sciences, The University of New South Wales, Sydney, NSW 2031, Australia.
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Dehnavi A, Soleymanpour A. New chemically modified carbon paste sensor for nanomolar concentration measurement of rifampicin in biological and pharmaceutical media. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 94:403-409. [DOI: 10.1016/j.msec.2018.09.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 07/31/2018] [Accepted: 09/19/2018] [Indexed: 10/28/2022]
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Greule A, Marolt M, Deubel D, Peintner I, Zhang S, Jessen-Trefzer C, De Ford C, Burschel S, Li SM, Friedrich T, Merfort I, Lüdeke S, Bisel P, Müller M, Paululat T, Bechthold A. Wide Distribution of Foxicin Biosynthetic Gene Clusters in Streptomyces Strains - An Unusual Secondary Metabolite with Various Properties. Front Microbiol 2017; 8:221. [PMID: 28270798 PMCID: PMC5318452 DOI: 10.3389/fmicb.2017.00221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 01/31/2017] [Indexed: 01/13/2023] Open
Abstract
Streptomyces diastatochromogenes Tü6028 is known to produce the polyketide antibiotic polyketomycin. The deletion of the pokOIV oxygenase gene led to a non-polyketomycin-producing mutant. Instead, novel compounds were produced by the mutant, which have not been detected before in the wild type strain. Four different compounds were identified and named foxicins A–D. Foxicin A was isolated and its structure was elucidated as an unusual nitrogen-containing quinone derivative using various spectroscopic methods. Through genome mining, the foxicin biosynthetic gene cluster was identified in the draft genome sequence of S. diastatochromogenes. The cluster spans 57 kb and encodes three PKS type I modules, one NRPS module and 41 additional enzymes. A foxBII gene-inactivated mutant of S. diastatochromogenes Tü6028 ΔpokOIV is unable to produce foxicins. Homologous fox biosynthetic gene clusters were found in more than 20 additional Streptomyces strains, overall in about 2.6% of all sequenced Streptomyces genomes. However, the production of foxicin-like compounds in these strains has never been described indicating that the clusters are expressed at a very low level or are silent under fermentation conditions. Foxicin A acts as a siderophore through interacting with ferric ions. Furthermore, it is a weak inhibitor of the Escherichia coli aerobic respiratory chain and shows moderate antibiotic activity. The wide distribution of the cluster and the various properties of the compound indicate a major role of foxicins in Streptomyces strains.
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Affiliation(s)
- Anja Greule
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Marija Marolt
- Department of Pharmaceutical and Medical Chemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Denise Deubel
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Iris Peintner
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Songya Zhang
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Claudia Jessen-Trefzer
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Christian De Ford
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of FreiburgFreiburg im Breisgau, Germany; Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-University of FreiburgFreiburg im Breisgau, Germany
| | - Sabrina Burschel
- Institute of Biochemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Shu-Ming Li
- Department of Pharmaceutical Biology, Philipps-University Marburg Marburg, Germany
| | - Thorsten Friedrich
- Institute of Biochemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Irmgard Merfort
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Steffen Lüdeke
- Department of Pharmaceutical and Medical Chemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Philippe Bisel
- Department of Pharmaceutical and Medical Chemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Michael Müller
- Department of Pharmaceutical and Medical Chemistry, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
| | - Thomas Paululat
- Department of Chemistry and Biology, University of Siegen Siegen, Germany
| | - Andreas Bechthold
- Department of Pharmaceutical Biology and Biotechnology, Albert-Ludwigs-University of Freiburg Freiburg im Breisgau, Germany
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Larsen EM, Wilson MR, Taylor RE. Conformation-activity relationships of polyketide natural products. Nat Prod Rep 2015; 32:1183-206. [PMID: 25974024 PMCID: PMC4443481 DOI: 10.1039/c5np00014a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Polyketides represent an important class of secondary metabolites that interact with biological targets connected to a variety of disease-associated pathways. Remarkably, nature's assembly lines, polyketide synthases, manufacture these privileged structures through a combinatorial mixture of just a few structural units. This review highlights the role of these structural elements in shaping a polyketide's conformational preferences, the use of computer-based molecular modeling and solution NMR studies in the identification of low-energy conformers, and the importance of conformational analogues in probing the bound conformation. In particular, this review covers several examples wherein conformational analysis complements classic structure-activity relationships in the design of biologically active natural product analogues.
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Affiliation(s)
- Erik M Larsen
- University of Notre Dame, Department of Chemistry & Biochemistry, 250 Nieuwland Science Hall, Notre Dame, Indiana, USA.
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17
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Synthesis of 19-substituted geldanamycins with altered conformations and their binding to heat shock protein Hsp90. Nat Chem 2013; 5:307-14. [PMID: 23511419 DOI: 10.1038/nchem.1596] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 02/04/2013] [Indexed: 12/19/2022]
Abstract
The benzoquinone ansamycin geldanamycin and its derivatives are inhibitors of heat shock protein Hsp90, an emerging target for novel therapeutic agents both in cancer and in neurodegeneration. However, the toxicity of these compounds to normal cells has been ascribed to reaction with thiol nucleophiles at the quinone 19-position. We reasoned that blocking this position would ameliorate toxicity, and that it might also enforce a favourable conformational switch of the trans-amide group into the cis-form required for protein binding. Here, we report an efficient synthesis of such 19-substituted compounds and realization of our hypotheses. Protein crystallography established that the new compounds bind to Hsp90 with, as expected, a cis-amide conformation. Studies on Hsp90 inhibition in cells demonstrated the molecular signature of Hsp90 inhibitors: decreases in client proteins with compensatory increases in other heat shock proteins in both human breast cancer and dopaminergic neural cells, demonstrating their potential for use in the therapy of cancer or neurodegenerative diseases.
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Abstract
Toxin payloads, or drugs, are the crucial components of therapeutic antibody-drug conjugates (ADCs). This review will give an introduction on the requirements that make a toxic compound suitable to be used in an antitumoral ADC and will summarize the structural and mechanistic features of four drug families that yielded promising results in preclinical and clinical studies.
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Affiliation(s)
- Jan Anderl
- Heidelberg Pharma GmbH, Ladenburg, Germany
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19
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Rodríguez-Berríos RR, Torres G, Prieto JA. Stereoselective VO(acac)(2) Catalyzed Epoxidation of Acyclic Homoallylic Diols. Complementary Preparation of C2-syn-3,4-Epoxy Alcohols. Tetrahedron 2011; 67:830-836. [PMID: 21311601 DOI: 10.1016/j.tet.2010.11.079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A substrate-controlled stereoselective epoxidation of free and monoprotected homoallylic diols was developed. This second-generation approach is based on the incorporation of a primary hydroxy directing group at the C2 methyl carbon, which changes the nature of the vanadium ester intermediate providing a new diastereoselectivity manifold for the preparation of 3,4-epoxy alcohols. This modification favored the formation of the challenging C2-syn epoxy alcohol product not previously available using the standard homoallylic alcohol substrates. These new epoxy alcohol diastereomers expand the scope and generality for the utilization of 3,4-epoxy alcohols as precursors for stereoselective polypropionate synthesis.
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Affiliation(s)
- Raúl R Rodríguez-Berríos
- Department of Chemistry, University of Puerto Rico, Río Piedras Campus, PO Box 70377, San Juan, PR 00931-3346, USA
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Zhu N, Zhao P, Shen Y. Selective isolation and ansamycin-targeted screenings of commensal actinomycetes from the "maytansinoids-producing" arboreal Trewia nudiflora. Curr Microbiol 2008; 58:87-94. [PMID: 18953605 DOI: 10.1007/s00284-008-9284-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Accepted: 09/08/2008] [Indexed: 11/28/2022]
Abstract
To verify the hypothesis on the involvement of commensal actinomycetes in the biosynthesis of plant maytansinoids that belong to the ansamycin family, selective isolation and targeted screenings were conducted. In total, 164 endophytic actinomycetes isolates were obtained from the roots, twigs, seeds, callus, and germ-free seedlings of "maytansinoids-producing" Trewia nudiflora Linn. by selective isolation methods. Crude extracts of the isolates were screened by antifungal bioassay against Penicillium avellaneum UC-4376, thin-layer chromatography, and liquid chromatography-mass spectrometry detection according to the bioactivity as well as structural characteristics of maytansinoids. Respectively, 25.0%, 64.8%, and 26.7% of the extracts were positive in corresponding screenings. Ten isolates showed positive results in all three different screenings. To confirm on a genetic level, 28 representative isolates from 20 morphological groups were screened by polymerase chain reaction with 3-amino-5-hydroxybenzoic acid synthase gene and carbamoyltransferase gene primers, both of which were involved in the biosynthesis of ansamycins. According to the results of the targeted screenings, two isolates Streptomyces sp. 5B and Streptomyces sp. M27m3 might have the potential of producing ansamycins, which further enhanced the hypothesis that endophyte(s) might be involved in the biosynthesis of plant maytansinoids.
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Abstract
At low temperature and in the presence of an acid catalyst, SO2 adds to 1,3-dienes equilibrating with the corresponding 3,6-dihydro-1,2-oxathiin-2-oxides (sultines). These compounds are unstable above -60 °C and equilibrate with the more stable 2,5-dihydrothiophene 1,1-dioxides (sulfolenes). The hetero-Diels-Alder additions of SO2 are suprafacial and follow the Alder endo rule. The sultines derived from 1-oxy-substituted and 1,3-dioxy-disubstituted 1,3-dienes cannot be observed at -100 °C but are believed to be formed faster than the corresponding sulfolenes. In the presence of acid catalysts, the 6-oxy-substituted sultines equilibrate with zwitterionic species that react with electron-rich alkenes such as enoxysilanes and allylsilanes, generating β,γ-unsaturated silyl sulfinates that can be desilylated and desulfinylated to generate polypropionate fragments containing up to three contiguous stereogenic centers and an (E)-alkene unit. Alternatively, the silyl sulfinates can be reacted with electrophiles to generate polyfunctional sulfones (one-pot, four-component synthesis of sulfones), or oxidized into sulfonyl chlorides and reacted with amines, then realizing a one-pot, four-component synthesis of polyfunctional sulfonamides. Using enantiomerically enriched dienes such as 1-[(R)- or 1-(S)-phenylethyloxy]-2-methyl-(E,E)-penta-1,3-dien-3-yl isobutyrate, derived from inexpensive (R)- or (S)-1-phenylethanol, enantiomerically enriched stereotriads are obtained in one-pot operations. The latter are ready for further chain elongation. This has permitted the development of expeditious total asymmetric syntheses of important natural products of biological interest such as the baconipyrones, rifamycin S, and apoptolidin A.
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Rascher A, Hu Z, Buchanan GO, Reid R, Hutchinson CR. Insights into the biosynthesis of the benzoquinone ansamycins geldanamycin and herbimycin, obtained by gene sequencing and disruption. Appl Environ Microbiol 2005; 71:4862-71. [PMID: 16085885 PMCID: PMC1183368 DOI: 10.1128/aem.71.8.4862-4871.2005] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Geldanamycin and the closely related herbimycins A, B, and C were the first benzoquinone ansamycins to be extensively studied for their antitumor properties as small-molecule inhibitors of the Hsp90 protein chaperone complex. These compounds are produced by two different Streptomyces hygroscopicus strains and have the same modular polyketide synthase (PKS)-derived carbon skeleton but different substitution patterns at C-11, C-15, and C-17. To set the stage for structural modification by genetic engineering, we previously identified the gene cluster responsible for geldanamycin biosynthesis. We have now cloned and sequenced a 115-kb segment of the herbimycin biosynthetic gene cluster from S. hygroscopicus AM 3672, including the genes for the PKS and most of the post-PKS tailoring enzymes. The similarities and differences between the gene clusters and biosynthetic pathways for these closely related ansamycins are interpreted with support from the results of gene inactivation experiments. In addition, the organization and functions of genes involved in the biosynthesis of the 3-amino-5-hydroxybenzoic acid (AHBA) starter unit and the post-PKS modifications of progeldanamycin were assessed by inactivating the subclusters of AHBA biosynthetic genes and two oxygenase genes (gdmM and gdmL) that were proposed to be involved in formation of the geldanamycin benzoquinoid system. A resulting novel geldanamycin analog, KOS-1806, was isolated and characterized.
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Affiliation(s)
- Andreas Rascher
- Kosan Biosciences, Inc., 3832 Bay Center Place, Hayward, CA 94545, USA.
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23
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Cassady JM, Chan KK, Floss HG, Leistner E. Recent Developments in the Maytansinoid Antitumor Agents. Chem Pharm Bull (Tokyo) 2004; 52:1-26. [PMID: 14709862 DOI: 10.1248/cpb.52.1] [Citation(s) in RCA: 234] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Maytansine and its congeners have been isolated from higher plants, mosses and from an Actinomycete, Actinosynnema pretiosum. Many of these compounds are antitumor agents of extraordinary potency, yet phase II clinical trials with maytansine proved disappointing. The chemistry and biology of maytansinoids has been reviewed repeatedly in the late 1970s and early 1980s; the present review covers new developments in this field during the last two decades. These include the use of maytansinoids as "warheads" in tumor-specific antibodies, preliminary metabolism studies, investigations of their biosynthesis at the biochemical and genetic level, and ecological issues related to the occurrence of such typical microbial metabolites in higher plants.
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Affiliation(s)
- John M Cassady
- College of Pharmacy, The Ohio State University, 500 West 12th Avenue, Columbus, OH 43210, USA
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Jin ZH, Lin JP, Xu ZN, Cen PL. Improvement of industry-applied rifamycin B-producing strain, Amycolatopsis mediterranei, by rational screening. J GEN APPL MICROBIOL 2002; 48:329-34. [PMID: 12682871 DOI: 10.2323/jgam.48.329] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
An industrially applied rifamycin B-producing strain, Amycolatopsis mediterranei XC 1-02, was used for further screening. A special mutation and screening procedure was adopted to select a strain, which can alleviate the inhibition caused by both aromatic amino acid and p-hydroxybenzoic acid in the pathway of rifamycin B biosynthesis as well as enhance the production of propionate, one of the precursors of rifamycin B biosynthesis. By the above methods, a strain A. mediterranei XC 9-25 was obtained, and its rifamycin B productivity in shaking flask reaches 10 g/L, which is 2.38 times higher than that of the ancestral strain XC 1-02. The productivity of rifamycin B fed-batch fermentation in 60000 L fermentor with A. mediterranei XC 9-25 reached 19.11 g/L.
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Affiliation(s)
- Zhi Hua Jin
- Institute of Bioengineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, P. R. China
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25
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Yu TW, Bai L, Clade D, Hoffmann D, Toelzer S, Trinh KQ, Xu J, Moss SJ, Leistner E, Floss HG. The biosynthetic gene cluster of the maytansinoid antitumor agent ansamitocin from Actinosynnema pretiosum. Proc Natl Acad Sci U S A 2002; 99:7968-73. [PMID: 12060743 PMCID: PMC123004 DOI: 10.1073/pnas.092697199] [Citation(s) in RCA: 244] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2001] [Indexed: 11/18/2022] Open
Abstract
Maytansinoids are potent antitumor agents found in plants and microorganisms. To elucidate their biosynthesis at the biochemical and genetic level and to set the stage for their structure modification through genetic engineering, we have cloned two gene clusters required for the biosynthesis of the maytansinoid, ansamitocin, from a cosmid library of Actinosynnema pretiosum ssp. auranticum ATCC 31565. This is a rare case in which the genes involved in the formation of a secondary metabolite are dispersed in separate regions in an Actinomycete. A set of genes, asm22-24, asm43-45, and asm47, was identified for the biosynthesis of the starter unit, 3-amino-5-hydroxybenzoic acid (AHBA). Remarkably, there are two AHBA synthase gene homologues, which may have different functions in AHBA formation. Four type I polyketide synthase genes, asmA-D, followed by the downloading asm9, together encode eight homologous sets of enzyme activities (modules), each catalyzing a specific round of chain initiation, elongation, or termination steps, which assemble the ansamitocin polyketide backbone. Another set of genes, asm13-17, encodes the formation of an unusual "methoxymalonate" polyketide chain extension unit that, notably, seems to be synthesized on a dedicated acyl carrier protein rather than as a CoA thioester. Additional ORFs are involved in postsynthetic modifications of the initial polyketide synthase product, which include methylations, an epoxidation, an aromatic chlorination, and the introduction of acyl and carbamoyl groups. Tentative functions of several asm genes were confirmed by inactivation and heterologous expression.
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Affiliation(s)
- Tin-Wein Yu
- Department of Chemistry, Box 351700, University of Washington, Seattle, WA 98195-1700, USA.
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Ochel HJ, Eichhorn K, Gademann G. Geldanamycin: the prototype of a class of antitumor drugs targeting the heat shock protein 90 family of molecular chaperones. Cell Stress Chaperones 2001; 6:105-12. [PMID: 11599571 PMCID: PMC434387 DOI: 10.1379/1466-1268(2001)006<0105:gtpoac>2.0.co;2] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2000] [Revised: 11/28/2000] [Accepted: 11/29/2000] [Indexed: 11/24/2022] Open
Affiliation(s)
- H J Ochel
- Medical Faculty, Clinic for Radiation Therapy, Otto-von-Guericke-University, Magdeburg, Germany.
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Yu TW, Shen Y, Doi-Katayama Y, Tang L, Park C, Moore BS, Richard Hutchinson C, Floss HG. Direct evidence that the rifamycin polyketide synthase assembles polyketide chains processively. Proc Natl Acad Sci U S A 1999; 96:9051-6. [PMID: 10430893 PMCID: PMC17730 DOI: 10.1073/pnas.96.16.9051] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The assembly of the polyketide backbone of rifamycin B on the type I rifamycin polyketide synthase (PKS), encoded by the rifA-rifE genes, is terminated by the product of the rifF gene, an amide synthase that releases the completed undecaketide as its macrocyclic lactam. Inactivation of rifF gives a rifamycin B nonproducing mutant that still accumulates a series of linear polyketides ranging from the tetra- to a decaketide, also detected in the wild type, demonstrating that the PKS operates in a processive manner. Disruptions of the rifD module 8 and rifE module 9 and module 10 genes also result in accumulation of such linear polyketides as a consequence of premature termination of polyketide assembly. Whereas the tetraketide carries an unmodified aromatic chromophore, the penta- through decaketides have undergone oxidative cyclization to the naphthoquinone, suggesting that this modification occurs during, not after, PKS assembly. The structure of one of the accumulated compounds together with (18)O experiments suggests that this oxidative cyclization produces an 8-hydroxy-7, 8-dihydronaphthoquinone structure that, after the stage of proansamycin X, is dehydrogenated to an 8-hydroxynaphthoquinone.
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Affiliation(s)
- T W Yu
- Department of Chemistry, Box 351700, University of Washington, Seattle, WA 98195-1700, USA
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Supko JG, Hickman RL, Grever MR, Malspeis L. Preclinical pharmacologic evaluation of geldanamycin as an antitumor agent. Cancer Chemother Pharmacol 1995; 36:305-15. [PMID: 7628050 DOI: 10.1007/bf00689048] [Citation(s) in RCA: 361] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The plasma pharmacokinetics of the anti-tumor antibiotic geldanamycin (GM: NSC 122750), a naturally occurring benzoquinoid ansamycin, was characterized in mice and a beagle dog. Concentrations of GM well above 0.1 microgram/ml, which was typically effective against neoplastic cell lines responsive to the drug in vitro, were achieved in the plasma of the mice and the dog treated by i.v. injection. However, the systemic duration of the drug was relatively short. Plasma levels decayed below 0.1 microgram/ml within 3-4 h after administration of the apparent maximum tolerated doses, which were approximately 20 mg/kg for the mice and 4 mg/kg for the dog. The drug exhibited linear pharmacokinetic behavior within the dose ranges studied. However, there were significant interspecies differences in its disposition. Whereas the mean biological half-life of GM was slightly longer in the mice (77.7 min) than in the dog (57.9 min), its mean residence time in the dog (46.6 min) was more than twofold greater than that observed in the mice (20.7 min). Nevertheless, the drug was cleared from plasma much faster by the dog (49.4 ml/min per kg) than by the mice (30.5 ml/min per kg). These apparent anomalies were principally associated with differences in the relative significance of the terminal phase upon overall drug disposition. The liver appeared to be the principal target organ of acute drug toxicity in the dog. Doses of 2.0 and 4.2 mg/kg both produced elevations in serum levels of the transaminases and other indicators of liver function characteristic of acute hepatic necrosis. Additional effects included symptoms of minor gastrointestinal toxicity and alterations in serum chemistry parameters consistent with less severe nephrotoxicity. Drug-related toxicity appeared to be reversible. In consideration of the potential for acute hepatotoxic reactions to GM, as well as to the other benzoquinoid ansamycins based upon structural analogy, additional pharmacological and therapeutic information is required to ascertain whether these compounds are viable candidates for clinical development.
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Affiliation(s)
- J G Supko
- Laboratory of Pharmaceutical Chemistry, National Cancer Institute, Frederick, MD 21701, USA
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Srivastava BI, DiCioccio RA, Chadha KC, Rinehart KL. Inhibition of cellular and virus-associated nucleotide polymerases by, and anti-herpes simplex virus activity of, streptovaricin derivatives. Antimicrob Agents Chemother 1981; 20:653-9. [PMID: 6119956 PMCID: PMC181768 DOI: 10.1128/aac.20.5.653] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Fourteen streptovaricin derivatives were tested for inhibition of cellular nucleotide polymerases (deoxyribonucleic acid polymerases alpha, beta, and gamma, terminal deoxynucleotidyltransferase [TdT], and ribonucleic acid polymerase II), simian sarcoma virus deoxyribonucleic acid polymerase, and herpes simplex virus type 1-induced deoxyribonucleic acid polymerase (HSV-DP). Three compounds (strep-tovadienal C, prestreptovarone, and streptoval Fc) preferentially inhibited TdT and HSV-DP over the other enzymes. These compounds inhibited HSV-DP more potently than they inhibited TdT. Evidence indicated that the mode of inhibition of TdT and HSV-DP by streptovadienal C and prestreptovarone was by interaction with the enzymes and not with template-primer, initiator, substrates, or divalent cations required for enzyme activity. Furthermore, data suggested that these compounds bind with greater affinity to HSV-DP than to TdT. Streptovadienal C and prestreptovarone were examined for their effect on the replication of herpes simplex virus type 1 in African green monkey kidney (CV1) cells. These compounds produced 2- and 3-log drops in virus titer, respectively, at concentrations not significantly affecting cell viability. This correlated with evidence indicating a greater binding affinity of these compounds for HSV-DP over cellular nucleotide polymerases.
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