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Han B, Li W, Chen S, Zhang Z, Zhao X, Zhang Y, Zhu L. Recent Advances in Copper-Catalyzed Silyl Addition of Unsaturated Compounds. CHINESE J ORG CHEM 2023. [DOI: 10.6023/cjoc202207043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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Yadav N, Sangwan S, Kumar R, Chauhan S, Duhan A, Singh A, Arya RK. Comprehensive Overview of Progress in Functionalization of 2‐Pyridone and 2, 4 ‐Dihydroxy Pyridine: Key Constituents of Vital Natural Products. ChemistrySelect 2021. [DOI: 10.1002/slct.202102941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Neelam Yadav
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Sarita Sangwan
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Ravi Kumar
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
- MAP Section Department of Genetics and Plant Breeding Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Sonu Chauhan
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Anil Duhan
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Ajay Singh
- Department of Chemistry Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
| | - Rajesh K. Arya
- MAP Section Department of Genetics and Plant Breeding Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana India 125004
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Singh P, Adolfsson DE, Ådén J, Cairns AG, Bartens C, Brännström K, Olofsson A, Almqvist F. Pyridine-Fused 2-Pyridones via Povarov and A3 Reactions: Rapid Generation of Highly Functionalized Tricyclic Heterocycles Capable of Amyloid Fibril Binding. J Org Chem 2019; 84:3887-3903. [DOI: 10.1021/acs.joc.8b03015] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | | | | | - Christian Bartens
- Institute of Organic Chemistry and Center of Biomolecular Drug Research (BMWZ), Leibniz Universität Hannover, Schneiderberg 1b, Hannover 30167, Germany
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Peptidomimetic Small Molecules Disrupt Type IV Secretion System Activity in Diverse Bacterial Pathogens. mBio 2016; 7:e00221-16. [PMID: 27118587 PMCID: PMC4850256 DOI: 10.1128/mbio.00221-16] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Bacteria utilize complex type IV secretion systems (T4SSs) to translocate diverse effector proteins or DNA into target cells. Despite the importance of T4SSs in bacterial pathogenesis, the mechanism by which these translocation machineries deliver cargo across the bacterial envelope remains poorly understood, and very few studies have investigated the use of synthetic molecules to disrupt T4SS-mediated transport. Here, we describe two synthetic small molecules (C10 and KSK85) that disrupt T4SS-dependent processes in multiple bacterial pathogens. Helicobacter pylori exploits a pilus appendage associated with the cag T4SS to inject an oncogenic effector protein (CagA) and peptidoglycan into gastric epithelial cells. In H. pylori, KSK85 impedes biogenesis of the pilus appendage associated with the cag T4SS, while C10 disrupts cag T4SS activity without perturbing pilus assembly. In addition to the effects in H. pylori, we demonstrate that these compounds disrupt interbacterial DNA transfer by conjugative T4SSs in Escherichia coli and impede vir T4SS-mediated DNA delivery by Agrobacterium tumefaciens in a plant model of infection. Of note, C10 effectively disarmed dissemination of a derepressed IncF plasmid into a recipient bacterial population, thus demonstrating the potential of these compounds in mitigating the spread of antibiotic resistance determinants driven by conjugation. To our knowledge, this study is the first report of synthetic small molecules that impair delivery of both effector protein and DNA cargos by diverse T4SSs. Many human and plant pathogens utilize complex nanomachines called type IV secretion systems (T4SSs) to transport proteins and DNA to target cells. In addition to delivery of harmful effector proteins into target cells, T4SSs can disseminate genetic determinants that confer antibiotic resistance among bacterial populations. In this study, we sought to identify compounds that disrupt T4SS-mediated processes. Using the human gastric pathogen H. pylori as a model system, we identified and characterized two small molecules that prevent transfer of an oncogenic effector protein to host cells. We discovered that these small molecules also prevented the spread of antibiotic resistance plasmids in E. coli populations and diminished the transfer of tumor-inducing DNA from the plant pathogen A. tumefaciens to target cells. Thus, these compounds are versatile molecular tools that can be used to study and disarm these important bacterial machines.
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Han YY, Wang H, Yu S. Synthesis of biaryl sultams using visible-light-promoted denitrogenative cyclization of 1,2,3,4-benzothiatriazine-1,1-dioxides. Org Chem Front 2016. [DOI: 10.1039/c6qo00116e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel approach has been reported for the preparation of biaryl sultams using visible-light-promoted denitrogenative cyclization of 1,2,3,4-benzothiatriazine-1,1-dioxides.
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Affiliation(s)
- Yue-Yue Han
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Hao Wang
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Shouyun Yu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
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Single injection of small-molecule amyloid accelerator results in cell death of nigral dopamine neurons in mice. NPJ PARKINSONS DISEASE 2015; 1:15024. [PMID: 28725689 PMCID: PMC5516562 DOI: 10.1038/npjparkd.2015.24] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 10/14/2015] [Accepted: 11/13/2015] [Indexed: 12/21/2022]
Abstract
The assembly process of α-synuclein toward amyloid fibers is linked to neurodegeneration in Parkinson’s disease. In the present study, we capitalized on the in vitro discovery of a small-molecule accelerator of α-synuclein amyloid formation and assessed its effects when injected in brains of normal mice. An accelerator and an inhibitor of α-synuclein amyloid formation, as well as vehicle only, were injected into the striatum of normal mice and followed by behavioral evaluation, immunohistochemistry, and metabolomics up to six months later. The effects of molecules injected into the substantia nigra of normal and α-synuclein knock-out mice were also analyzed. When accelerator or inhibitor was injected into the brain of normal mice no acute compound toxicity was found. However, 6 months after single striatal injection of accelerator, mice sensorimotor functions were impaired, whereas mice injected with inhibitor had no dysfunctions. Injection of accelerator (but not inhibitor or vehicle) into the substantia nigra revealed significant loss of tyrosine hydroxylase (TH)-positive neurons after 3 months. No loss of TH-positive neurons was found in α-synuclein knock-out mice injected with accelerator into the substantia nigra. Metabolic serum profiles from accelerator-injected normal mice matched those of newly diagnosed Parkinson’s disease patients, whereas the profiles from inhibitor-injected normal mice matched controls. Single inoculation of a small-molecule amyloid accelerator may be a new approach for studies of early events during dopamine neurodegeneration in mice.
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Singh P, Chorell E, Krishnan KS, Kindahl T, Åden J, Wittung-Stafshede P, Almqvist F. Synthesis of Multiring Fused 2-Pyridones via a Nitrene Insertion Reaction: Fluorescent Modulators of α-Synuclein Amyloid Formation. Org Lett 2015; 17:6194-7. [DOI: 10.1021/acs.orglett.5b03190] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Pardeep Singh
- Umeå University, Department of Chemistry, 90187 Umeå, Sweden
| | - Erik Chorell
- Umeå University, Department of Chemistry, 90187 Umeå, Sweden
| | | | - Tomas Kindahl
- Umeå University, Department of Chemistry, 90187 Umeå, Sweden
| | - Jörgen Åden
- Umeå University, Department of Chemistry, 90187 Umeå, Sweden
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Andersson EK, Bengtsson C, Evans ML, Chorell E, Sellstedt M, Lindgren AE, Hufnagel DA, Bhattacharya M, Tessier PM, Wittung-Stafshede P, Almqvist F, Chapman MR. Modulation of curli assembly and pellicle biofilm formation by chemical and protein chaperones. CHEMISTRY & BIOLOGY 2013; 20:1245-54. [PMID: 24035282 PMCID: PMC4243843 DOI: 10.1016/j.chembiol.2013.07.017] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 07/19/2013] [Accepted: 07/30/2013] [Indexed: 12/22/2022]
Abstract
Enteric bacteria assemble functional amyloid fibers, curli, on their surfaces that share structural and biochemical properties with disease-associated amyloids. Here, we test rationally designed 2-pyridone compounds for their ability to alter amyloid formation of the major curli subunit CsgA. We identified several compounds that discourage CsgA amyloid formation and several compounds that accelerate CsgA amyloid formation. The ability of inhibitor compounds to stop growing CsgA fibers was compared to the same property of the CsgA chaperone, CsgE. CsgE blocked CsgA amyloid assembly and arrested polymerization when added to actively polymerizing fibers. Additionally, CsgE and the 2-pyridone inhibitors prevented biofilm formation by Escherichia coli at the air-liquid interface of a static culture. We demonstrate that curli amyloid assembly and curli-dependent biofilm formation can be modulated not only by protein chaperones, but also by "chemical chaperones."
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Affiliation(s)
- Emma K. Andersson
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Christoffer Bengtsson
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Margery L. Evans
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA
| | - Erik Chorell
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Magnus Sellstedt
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | | | - David A. Hufnagel
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA
| | - Moumita Bhattacharya
- Center for Biotechnology and Interdisciplinary Studies, Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Peter M. Tessier
- Center for Biotechnology and Interdisciplinary Studies, Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | | | - Fredrik Almqvist
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Matthew R. Chapman
- Umeå Centre for Microbial Research, Umeå University, 901 87 Umeå, Sweden
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA
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Sellstedt M, Krishna Prasad G, Syam Krishnan K, Almqvist F. Directed diversity-oriented synthesis. Ring-fused 5- to 10-membered rings from a common peptidomimetic 2-pyridone precursor. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.100] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Bengtsson C, Almqvist F. A selective intramolecular 5-exo-dig or 6-endo-dig cyclization en route to 2-furanone or 2-pyrone containing tricyclic scaffolds. J Org Chem 2011; 76:9817-25. [PMID: 22008034 PMCID: PMC3225090 DOI: 10.1021/jo201952p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ringfused bicyclic 2-pyridones exhibit interesting biological properties against pili assembly in uropathogenic Escherichia coli (Pinkner, J. S. et al. Proc. Natl. Acad. Sci. U. S. A.2006, 103, 17897-17902; Åberg, V. et al. Org. Biomol. Chem.2007, 5, 1827-1834) as well as curli formation (Cegelski, L. et al. Nat. Chem. Biol.2009, 5, 913-919). In the search for new ring-fused central fragments, highly selective synthetic routes to the 2-furanone or 2-pyrone containing tricyclic scaffolds 1 and 2 have been developed.
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Yu F, Yan S, Huang R, Tang Y, Lin J. Three-component solvent-free synthesis of highly substituted tetra-hydroimidazo[1,2-a]pyridines. RSC Adv 2011. [DOI: 10.1039/c1ra00242b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Fang YQ, Bio MM, Hansen KB, Potter MS, Clausen A. Magnesium Coordination-Directed N-Selective Stereospecific Alkylation of 2-Pyridones, Carbamates, and Amides Using α-Halocarboxylic Acids. J Am Chem Soc 2010; 132:15525-7. [DOI: 10.1021/ja107709w] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yuan-Qing Fang
- Department of Chemical Process Research & Development, Department of Analytical Research & Development, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142
| | - Matthew M. Bio
- Department of Chemical Process Research & Development, Department of Analytical Research & Development, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142
| | - Karl B. Hansen
- Department of Chemical Process Research & Development, Department of Analytical Research & Development, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142
| | - Matthew S. Potter
- Department of Chemical Process Research & Development, Department of Analytical Research & Development, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142
| | - Andrew Clausen
- Department of Chemical Process Research & Development, Department of Analytical Research & Development, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142
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