1
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Backx S, Van Vooren J, Geerts J, Hyde C, Van Hecke O, Pappaert H, Dewitte K, Ameye M, Audenaert K, Desmedt W, Mangelinckx S. Study of Amino Acid-Derived 3-Acyltetramic Acids as Herbicidal Agents. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:19644-19656. [PMID: 39225292 DOI: 10.1021/acs.jafc.4c04811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
The growing problem of herbicide resistance necessitates the development of novel herbicidal active ingredients, together with other integrated weed management approaches. Natural products are a major source of inspiration for novel actives. In previous research, we identified a 3-acyltetramic acid of microbial origin that inhibited algal growth in marine biofilms, at least in part through inhibition of photosystem II. In this work, we demonstrate the herbicidal effect of this lead compound and construct multiple libraries to test the impact of the different substituents of the central scaffold in order to study the structure-activity relationships. Among these analogues, the highest activities were found for medium- to long-chain acyl groups and apolar secondary amino acid residues. Finally, we provide first insights into the herbicidal mechanisms and present preliminary field-trial and ecotoxicological results for TA12-Pro, the most active analogue in our library. Together, this research shows the potential of 3-acyltetramic acids for herbicide development.
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Affiliation(s)
- Simon Backx
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Jelle Van Vooren
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Jasper Geerts
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Cédric Hyde
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Owen Van Hecke
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Hanne Pappaert
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Kevin Dewitte
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Maarten Ameye
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
- Inagro, Ieperseweg 87, 8800 Roeselare, Belgium
| | - Kris Audenaert
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
| | - Willem Desmedt
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Plant Sciences Unit, Burg. van Gansberghelaan 96, 9820 Merelbeke, Belgium
| | - Sven Mangelinckx
- SynBioC Research Group, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
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Qandeel BM, Mowafy S, Abouzid K, Farag NA. Lead generation of UPPS inhibitors targeting MRSA: Using 3D-QSAR pharmacophore modeling, virtual screening, molecular docking, and molecular dynamic simulations. BMC Chem 2024; 18:14. [PMID: 38245752 PMCID: PMC10800075 DOI: 10.1186/s13065-023-01110-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 12/21/2023] [Indexed: 01/22/2024] Open
Abstract
Undecaprenyl Pyrophosphate Synthase (UPPS) is a vital target enzyme in the early stages of bacterial cell wall biosynthesis. UPPS inhibitors have antibacterial activity against resistant strains such as MRSA and VRE. In this study, we used several consecutive computer-based protocols to identify novel UPPS inhibitors. The 3D QSAR pharmacophore model generation (HypoGen algorithm) protocol was used to generate a valid predictive pharmacophore model using a set of UPPS inhibitors with known reported activity. The developed model consists of four pharmacophoric features: one hydrogen bond acceptor, two hydrophobic, and one aromatic ring. It had a correlation coefficient of 0.86 and a null cost difference of 191.39, reflecting its high predictive power. Hypo1 was proven to be statistically significant using Fischer's randomization at a 95% confidence level. The validated pharmacophore model was used for the virtual screening of several databases. The resulting hits were filtered using SMART and Lipinski filters. The hits were docked into the binding site of the UPPS protein, affording 70 hits with higher docking affinities than the reference compound (6TC, - 21.17 kcal/mol). The top five hits were selected through extensive docking analysis and visual inspection based on docking affinities, fit values, and key residue interactions with the UPPS receptor. Moreover, molecular dynamic simulations of the top hits were performed to confirm the stability of the protein-ligand complexes, yielding five promising novel UPPS inhibitors.
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Affiliation(s)
- Basma M Qandeel
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Km28 Cairo-Ismailia Road, Ahmed Orabi District, Cairo, Egypt.
| | - Samar Mowafy
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Km28 Cairo-Ismailia Road, Ahmed Orabi District, Cairo, Egypt
| | - Khaled Abouzid
- Department of Pharmaceutical Chemistry, College of Pharmacy, Ain-Shams University, Abbasia, 11566, Egypt
| | - Nahla A Farag
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Km28 Cairo-Ismailia Road, Ahmed Orabi District, Cairo, Egypt.
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3
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Arseniev A, Panfilov M, Pobegalov G, Potyseva A, Pavlinova P, Yakunina M, Lee J, Borukhov S, Severinov K, Khodorkovskii M. Single-molecule studies reveal the off-pathway elemental pause state as a target of streptolydigin inhibition of RNA polymerase and its dramatic enhancement by Gre factors. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.05.542125. [PMID: 37333075 PMCID: PMC10274647 DOI: 10.1101/2023.06.05.542125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Antibiotic streptolydigin (Stl) inhibits bacterial transcription by blocking the trigger loop folding in the active center of RNA polymerase (RNAP), which is essential for catalysis. We use acoustic force spectroscopy to characterize the dynamics of transcription elongation in ternary elongation complexes of RNAP (ECs) in the presence of Stl at a single-molecule level. We found that Stl induces long-lived stochastic pauses while the instantaneous velocity of transcription between the pauses is unaffected. Stl enhances the short-lived pauses associated with an off-pathway elemental paused state of the RNAP nucleotide addition cycle. Unexpectedly, we found that transcript cleavage factors GreA and GreB, which were thought to be Stl competitors, do not alleviate the streptolydigin-induced pausing; instead, they synergistically increase transcription inhibition by Stl. This is the first known instance of a transcriptional factor enhancing antibiotic activity. We propose a structural model of the EC-Gre-Stl complex that explains the observed Stl activities and provides insight into possible cooperative action of secondary channel factors and other antibiotics binding at the Stl-pocket. These results offer a new strategy for high-throughput screening for prospective antibacterial agents.
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Affiliation(s)
- Anatolii Arseniev
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
- Institute of Molecular Genetics, Russian Academy of Sciences, Moscow, Russian Federation
| | - Mikhail Panfilov
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
| | - Georgii Pobegalov
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
| | - Alina Potyseva
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
| | - Polina Pavlinova
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
| | - Maria Yakunina
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia
| | - Jookyung Lee
- Department of Cell Biology and Neuroscience, Rowan University School of Osteopathic Medicine, Stratford, NJ 08084-1489, USA
| | - Sergei Borukhov
- Department of Cell Biology and Neuroscience, Rowan University School of Osteopathic Medicine, Stratford, NJ 08084-1489, USA
| | - Konstantin Severinov
- Institute of Gene Biology, Russian Academy of Sciences, Moscow, Russia
- Waksman Institute of Microbiology, Rutgers, The State University of New Jersey, Piscataway, NJ, United States
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4
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Saney L, Christensen KE, Li X, Genov M, Pretsch A, Pretsch D, Moloney MG. Tetramate Derivatives by Chemoselective Dieckmann Ring Closure of threo-Phenylserines and Their Antibacterial Activity. J Org Chem 2022; 87:12240-12249. [PMID: 36052923 PMCID: PMC9486951 DOI: 10.1021/acs.joc.2c01382] [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] [Indexed: 11/28/2022]
Abstract
![]()
A general route, which provides direct access to substituted
bicyclic
tetramates, making use of Dieckmann cyclization of oxazolidines derived
from threo-arylserines, is reported; the latter were
found to be available by an efficient aldol-like reaction of glycine
with some substituted benzaldehydes under alkaline conditions. The
tetramates were found to release chelated metal cations acquired during
chromatographic purification by mild acid wash. Some compounds in
the library showed good antibacterial activity against Gram-positive
bacteria. Cheminformatic analysis demonstrates that the most active
compounds were Ro5-compliant and occupy a narrow region of chemical
space, distinct from that occupied by other known antibiotics, with
the most potent compounds having 399 < Mw < 530 Da;
3.5 < cLogP < 6.6; 594 < MSA <818 Å2; 9.6 < rel. PSA <13.3%. MIC values were shifted to
higher concentrations when tested in the presence of HSA or blood,
but was not completely abolished, consistent with a plasma protein
binding (PPB) effect.
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Affiliation(s)
- Liban Saney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Kirsten E Christensen
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Xiang Li
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing 211198, P. R. China
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Oxford Suzhou Centre for Advanced Research, Suzhou Industrial Park, Building A, 388 Ruo Shui Road, Jiangsu 215123, P.R. China
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5
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Drescher C, Brückner R. Structure‐Proving Syntheses of the Polyenoyltetramic Acids Pyranonigrin J and I. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Christian Drescher
- Institut für Organische Chemie Albert-Ludwigs-Universität Albertstraße 21 79104 Freiburg Germany
| | - Reinhard Brückner
- Institut für Organische Chemie Albert-Ludwigs-Universität Albertstraße 21 79104 Freiburg Germany
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6
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Zhang R, Genov M, Pretsch A, Pretsch D, Moloney MG. Mediation of metal chelation in cysteine-derived tetramate systems. Chem Sci 2021; 12:16106-16122. [PMID: 35024133 PMCID: PMC8672780 DOI: 10.1039/d1sc05542a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/22/2021] [Indexed: 12/11/2022] Open
Abstract
A study of bicyclic tetramates modified with a bulky ester, which leads to steric hindrance of distal chelating atoms as a route for the alteration of metal binding ability is reported. This approach required the development of a direct method for the synthesis of different esters of cysteine from cystine, which then provided access to bicyclic tetramates by Dieckmann cyclisation. Further derivation to ketones and carboxamides by Grignard addition and transamination reactions respectively provided rapid access to a chemical library of tetramates with diverse substitution. Of interest is that bicyclic tetramate ketones and carboxamides showed different tautomeric and metal binding behaviour in solution. Significantly, in both systems, the incorporation of bulky C-5 esters at the bridging position not only reduced metal binding, but also enhanced antibacterial potencies against Gram-positive MRSA bacteria. Those tetramates with antibacterial activity which was not metal dependent showed physiochemical properties of MSA of 559-737 Å2, MW of 427-577 Da, clogP of 1.8-6.1, clogD7.4 of -1.7 to 3.7, PSA of 83-109 Å2 and relative PSA of 12-15% and were generally Lipinski rule compliant. A subset of tetramates exhibited good selectivity towards prokaryotic bacterial cells. Given that the work reported herein is synthesis-led, without the underpinning detailed mechanistic understanding of biological/biochemical mechanism, that the most active compounds occupy a small region of chemical space as defined by MW, clogP, PSA and %PSA is of interest. Overall, the bicyclic tetramate template is a promising structural motif for the development of novel antibacterial drugs, with good anti-MRSA potencies and appropriate drug-like physiochemical properties, coupled with a potential for multi-targeting mechanisms and low eukaryotic cytotoxicity.
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Affiliation(s)
- Ruirui Zhang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK
| | - Miroslav Genov
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Alexander Pretsch
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Dagmar Pretsch
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK .,Oxford Suzhou Centre for Advanced Research Building A, 388 Ruo Shui Road, Suzhou Industrial Park Jiangsu 215123 P. R. China
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7
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Zhang R, Genov M, Pretsch A, Pretsch D, Moloney MG. Metal Binding and Its Amelioration in Tetramates. J Org Chem 2021; 86:12886-12907. [PMID: 34465089 DOI: 10.1021/acs.joc.1c01541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Metal chelation in tetramates may be ameliorated by changing the ligating group and by steric blocking, which in turn leads to a change in their antibacterial properties; the former was achieved by replacement of an amide with a C-9 C═N bond and the latter by the synthesis of cysteine-derived tetramates with functionalization at the C-6 or C-9 enolic groups. In both cases, the metal-chelating ability was weak, and a loss of antibacterial activity was observed. Tetramate alkylations with an extended tricarbonyl-conjugated system could be achieved under Mitsunobu conditions which led to regioisomers, distinguishable by careful heteronuclear multiple bond coherence correlation and carbonyl carbon chemical shift analysis. C-9 and C-6 O-alkylation were observed but not C-8 O-alkylation for tetramate carboxamides; interestingly, C-7 alkylation with allyl and prenyl derivatives was also observed, and this arose by the rearrangement of initially formed O-alkyl products. Only the C-7 alkylated tetramate derivatives 13a and 13d with no metal-chelating ability demonstrated promising antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA), with the most active analogue exhibiting a minimum inhibitory concentration of ≤ 1.95 μg/mL against MRSA, suggesting a mechanism of action independent of metal chelation. Otherwise, modifications at C-6/C-9 of tetramates led to a complete loss of metal-chelating ability, which correlated with the loss of antibacterial activity. This work further confirms that the metal-chelating capability is of fundamental importance in the biological activity of tetramates.
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Affiliation(s)
- Ruirui Zhang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Oxford Suzhou Centre for Advanced Research, Building A, 388 Ruo Shui Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
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8
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Treiber L, Pezolt C, Zeng H, Schrey H, Jungwirth S, Shekhar A, Stadler M, Bilitewski U, Erb-Brinkmann M, Schobert R. Dual Agents: Fungal Macrocidins and Synthetic Analogues with Herbicidal and Antibiofilm Activities. Antibiotics (Basel) 2021; 10:antibiotics10081022. [PMID: 34439072 PMCID: PMC8388955 DOI: 10.3390/antibiotics10081022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/16/2021] [Accepted: 08/19/2021] [Indexed: 12/16/2022] Open
Abstract
Eight analogues of the bioherbicides macrocidin A (1) and Z (2) with structural variance in the size of the macrocycle, its para- or meta-cyclophane character, and its functional groups were synthesized on two modular routes and tested for herbicidal, antibiotic, and antibiofilm activities. Apart from the lead compounds 1 and 2, the structurally simplified dihydromacrocidin Z (3) and normacrocidin Z (4) showed high herbicidal activity in either thistles, dandelions or in both. The derivatives 2, 3, and dibromide 9 also inhibited the growth of Staphylococcus aureus biofilms by ca 70% when applied at subtoxic concentrations as low as ca 20 µM, which are unlikely to induce bacterial resistance. They also led to the dispersion of preformed biofilms of S. aureus, exceeding a similar effect by microporenic acid A, a known biofilm inhibitor. Compounds 3 and 9 showed no noticeable cytotoxicity against human cancer and endothelial cells at concentrations below 50 µM, making them conceivable candidates for application as anti-biofilm agents in a medicinal context.
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Affiliation(s)
- Laura Treiber
- Department of Chemistry, University Bayreuth, Universitaetsstr. 30, 95440 Bayreuth, Germany; (L.T.); (C.P.)
| | - Christine Pezolt
- Department of Chemistry, University Bayreuth, Universitaetsstr. 30, 95440 Bayreuth, Germany; (L.T.); (C.P.)
| | - Haoxuan Zeng
- Department of Microbial Drugs, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (H.Z.); (H.S.); (M.S.)
- Institute of Microbiology, Technische Universität Braunschweig, Spielmannstraße 7, 38106 Braunschweig, Germany
| | - Hedda Schrey
- Department of Microbial Drugs, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (H.Z.); (H.S.); (M.S.)
- Institute of Microbiology, Technische Universität Braunschweig, Spielmannstraße 7, 38106 Braunschweig, Germany
| | - Stefan Jungwirth
- Compound Profiling and Screening, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (S.J.); (A.S.); (U.B.)
| | - Aditya Shekhar
- Compound Profiling and Screening, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (S.J.); (A.S.); (U.B.)
| | - Marc Stadler
- Department of Microbial Drugs, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (H.Z.); (H.S.); (M.S.)
- Institute of Microbiology, Technische Universität Braunschweig, Spielmannstraße 7, 38106 Braunschweig, Germany
| | - Ursula Bilitewski
- Compound Profiling and Screening, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany; (S.J.); (A.S.); (U.B.)
| | | | - Rainer Schobert
- Department of Chemistry, University Bayreuth, Universitaetsstr. 30, 95440 Bayreuth, Germany; (L.T.); (C.P.)
- Correspondence: ; Fax: +49-(0)921-552672
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9
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Zhang R, Li X, Genov M, Pretsch A, Pretsch D, Moloney MG. Synthetic Access to Hydrophilic Tetramate Derivatives of Cysteine. J Org Chem 2020; 85:12393-12407. [PMID: 32880449 DOI: 10.1021/acs.joc.0c01636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The synthesis, structural, and antibacterial evaluation of bicyclic tetramate derivatives of cysteine rendered hydrophilic with pendant heterocyclic substituents is reported; effective synthetic protocols and antibacterial activity for a small library of polar derivatives were found, and direct evidence for strong metal chelation in these systems was obtained. A computational study has developed a detailed understanding of the controlling factors of the key Dieckmann cyclization step.
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Affiliation(s)
- Ruirui Zhang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Xiang Li
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing 211198, P. R. China
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Oxford Suzhou Centre for Advanced Research, Building A, 388 Ruo Shui Road, Suzhou Industrial Park, Jiangsu 215123, P. R. China
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10
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Wingen LM, Rausch M, Schneider T, Menche D. Synthesis of Tetramic Acid Fragments Derived from Vancoresmycin Showing Inhibitory Effects towards S. aureus. ChemMedChem 2020; 15:1390-1393. [PMID: 32497343 PMCID: PMC7496136 DOI: 10.1002/cmdc.202000241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Indexed: 11/28/2022]
Abstract
An efficient route to various vancoresmycin‐type tetramic acids has been developed. The modular route is based on an effective Fries‐type rearrangement to introduce various appending acetyl residues. The minimum inhibitory concentration (MIC) values of the new tetramic acids against Staphylococcus aureus and Escherichia coli were determined, revealing that three of the new compounds exhibit antimicrobial activity against S. aureus. These bioactive compounds were structurally most closely related to the authentic vancoresmycin building block. Additionally, the compounds induced a lial‐lux bioreporter, which responds to cell wall stress induced by antibiotics that interfere with the lipid II biosynthesis cycle. These data suggest the tetramic acid moiety to be a part of the vancoresmycin pharmacophore.
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Affiliation(s)
- Lukas Martin Wingen
- Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121, Bonn, Germany
| | - Marvin Rausch
- Institut für Pharmazeutische Mikrobiologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Meckenheimer Allee 168, 53115, Bonn, Germany.,German Center for Infection Research (DZIF), Partner site, Bonn-Cologne, Bonn, Germany
| | - Tanja Schneider
- Institut für Pharmazeutische Mikrobiologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Meckenheimer Allee 168, 53115, Bonn, Germany
| | - Dirk Menche
- Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121, Bonn, Germany
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11
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Drescher C, Keller M, Potterat O, Hamburger M, Brückner R. Structure-Elucidating Total Synthesis of the (Polyenoyl)tetramic Acid Militarinone C§. Org Lett 2020; 22:2559-2563. [PMID: 32191484 DOI: 10.1021/acs.orglett.0c00431] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The (polyenoyl)tetramic acid militarinone C (1) heads a family of seven members. Before our work, the configuration of C-5 was unknown whereas the configurations of C-8' and C-10' were either (R,R) or (S,S). We synthesized the four stereoisomers of constitution 1, which conform with these insights. This included cross-coupling both enantiomers of the western building block (8) with both enantiomers of the eastern building block (9). The specific rotations of the resulting 1 isomers suggested that natural 1 is configured like the coupling partners (S)-8 and (R,R)-9. This conclusion was corroborated by degrading natural 1 to alcohol 35 and by proving its configurational identity with synthetic (R,R)-35.
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Affiliation(s)
- Christian Drescher
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstrasse 21, D-79104 Freiburg, Germany
| | - Morris Keller
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Olivier Potterat
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Matthias Hamburger
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstrasse 21, D-79104 Freiburg, Germany
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12
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Zhu WR, Su Q, Lin N, Chen Q, Zhang ZW, Weng J, Lu G. Organocatalytic synthesis of chiral CF3-containing oxazolidines and 1,2-amino alcohols: asymmetric oxa-1,3-dipolar cycloaddition of trifluoroethylamine-derived azomethine ylides. Org Chem Front 2020. [DOI: 10.1039/d0qo00990c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of CF3-containing oxazolidines were constructed via organocatalytic asymmetric oxa-1,3-dipolar cycloaddition. These oxazolidines could undergo facile conversion to CF3-containing 1,2-amino alcohols with vicinal stereogenic centers.
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Affiliation(s)
- Wen-Run Zhu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Qiong Su
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Ning Lin
- College of Pharmacy
- Guangxi Zhuang Yao Medicine Center of Engineering and Technology
- Guangxi University of Chinese Medicine
- Guangxi University of Chinese Medicine
- Nanning
| | - Qing Chen
- College of Pharmacy
- Guangxi Zhuang Yao Medicine Center of Engineering and Technology
- Guangxi University of Chinese Medicine
- Guangxi University of Chinese Medicine
- Nanning
| | - Zhen-Wei Zhang
- College of Pharmacy
- Guangxi Zhuang Yao Medicine Center of Engineering and Technology
- Guangxi University of Chinese Medicine
- Guangxi University of Chinese Medicine
- Nanning
| | - Jiang Weng
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Gui Lu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
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13
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Josa-Culleré L, Hirst MG, Lockett JP, Thompson AL, Moloney MG. Spirocyclic Tetramates by Sequential Knoevenagel and [1,5]-Prototropic Shift. J Org Chem 2019; 84:9671-9683. [PMID: 31276419 DOI: 10.1021/acs.joc.9b01345] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Highly functionalized spirocyclic tetramates were prepared via a sequential Knoevenagel reaction and [1,5]-prototropic shift (T-reaction) of bicyclic tetramates. While these compounds isomerize in solution, stable analogues can be prepared via an appropriate choice of substituents. Further modification of these compounds allows for the introduction of aromatic groups, making them suitable as skeletons for application in medicinal chemistry.
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Affiliation(s)
- Laia Josa-Culleré
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Michael G Hirst
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Jonathan P Lockett
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Amber L Thompson
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K
| | - Mark G Moloney
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford OX1 3TA , U.K.,Oxford Suzhou Centre for Advanced Research , Building A, 388 Ruo Shui Road, Suzhou Industrial Park , Jiangsu 215123 , P. R. China
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14
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Panduwawala TD, Iqbal S, Thompson AL, Genov M, Pretsch A, Pretsch D, Liu S, Ebright RH, Howells A, Maxwell A, Moloney MG. Functionalised bicyclic tetramates derived from cysteine as antibacterial agents. Org Biomol Chem 2019; 17:5615-5632. [PMID: 31120090 PMCID: PMC6686852 DOI: 10.1039/c9ob01076a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Routes to bicyclic tetramates derived from cysteine permitting ready incorporation of functionality at two different points around the periphery of a heterocyclic skeleton are reported. This has enabled the identification of systems active against Gram-positive bacteria, some of which show gyrase and RNA polymerase inhibitory activity. In particular, tetramates substituted with glycosyl side chains, chosen to impart polarity and aqueous solubility, show high antibacterial activity coupled with modest gyrase/polymerase activity in two cases. An analysis of physicochemical properties indicates that the antibacterially active tetramates generally occupy physicochemical space with MW of 300-600, clog D7.4 of -2.5 to 4 and rel. PSA of 11-22%. This work demonstrates that biologically active 3D libraries are readily available by manipulation of a tetramate skeleton.
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Affiliation(s)
- Tharindi D Panduwawala
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, UK.
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15
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Synthesis, characterization and antimicrobial activity of N-acetyl-3-acetyl-5-benzylidene tetramic acid-metal complexes. X-ray analysis and identification of the Cd(II) complex as a potent antifungal agent. J Inorg Biochem 2019; 194:65-73. [DOI: 10.1016/j.jinorgbio.2019.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 02/10/2019] [Accepted: 02/18/2019] [Indexed: 12/23/2022]
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16
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Metal-Catalyzed and Metal-Mediated Approaches to the Synthesis and Functionalization of Tetramic Acids. Catalysts 2019. [DOI: 10.3390/catal9010050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The heterocyclic ring of tetramic acids is found in naturally occurred biologically active products isolated from fungi, bacteria, molds, and sponges. Thus, these molecules have attracted significant attention as synthetic targets, and various synthetic paths have been developed. Over recent years, a growing number of catalytic approaches toward functionalized products have been established in order to overcome the limitations of the conventional methods. The present review describes the strategies for the metal-catalyzed and metal-promoted synthesis and further derivatization of tetramic acids, with emphasis on recent examples from the literature.
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17
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Li R, Lian X, Wang Z, Wang Y. Radical Cation Initiated Surface Polymerization on Photothermal Rubber for Smart Antifouling Coatings. Chemistry 2018; 25:183-188. [PMID: 30325541 DOI: 10.1002/chem.201804526] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Indexed: 12/13/2022]
Abstract
Biofouling on surfaces of various materials has attracted considerable attention in biomedical and marine industries. Surface grafting based on covalent surface-initiated polymerization offers a popular route to address this problem by providing diverse robust polymer coatings capable of preventing the biofouling in complex environments. However, the existing methods for synthesizing polymer coatings are complicated and rigorous, or require special catalysts, greatly limiting their practical applications. In this work, a radical-cation-based surface-initiated polymerization protocol to graft the surface of darkened trans-polyisoprene (TPI) rubber with a thermo-responsive smart polymer, poly(N-isopropylacrylamide) (PNIPAM), through a simple iodine doping process is reported. A series of characterizations were performed to provide adequate evidence to confirm the successful grafting. Combining the thermal sensitivity of PNIPAM with the photothermal conversion ability of the darkened rubber, efficient bacteria-killing and antifouling capabilities were successfully achieved as a result of temperature-controlled iodine release and switchable amphiphilicity of PNIPAM.
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Affiliation(s)
- Ruiting Li
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Xiaodong Lian
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Zhen Wang
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
| | - Yapei Wang
- Department of Chemistry, Renmin University of China, Beijing, 100872, China
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18
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Schütznerová E, Oliver AG, Přibylka A, Krchňák V. Solid-Phase Synthesis of Tetramic Acid via Resin-Bound Enol Ethers as a Privileged Scaffold in Drug Discovery. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800645] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Eva Schütznerová
- Institute of Molecular and Translation Medicine, Faculty of Medicine; Palacký University; Hněvotínská 5 Olomouc 779 00 Czech Republic
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Center; University of Notre Dame; Notre Dame, Indiana 46556 United States
| | - Adam Přibylka
- Department of Organic Chemistry, Faculty of Science; Palacký University; 17. listopadu 12 771 46 Olomouc Czech Republic
| | - Viktor Krchňák
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Center; University of Notre Dame; Notre Dame, Indiana 46556 United States
- Department of Organic Chemistry, Faculty of Science; Palacký University; 17. listopadu 12 771 46 Olomouc Czech Republic
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19
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Schütznerová E, Přibylka A, Krchňák V. N α-Amino acid containing privileged structures: design, synthesis and use in solid-phase peptide synthesis. Org Biomol Chem 2018; 16:5359-5362. [PMID: 30014064 DOI: 10.1039/c8ob01485j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Fmoc-protected Nα-amino acid containing heterocyclic privileged structures, O-(1-methyl-5-oxo-2,5-dihydro-1H-pyrrol-3-yl)-l-serine and O-((S)-5-oxo-2,3,5,7a-tetrahydro-1H-pyrrolizin-7-yl)-l-serine, were synthesized on the solid phase from simple commercially available building blocks under mild conditions. The amino acid side-chain is composed of tetramic acid, a natural product derived privileged structure. The key transformation was the formation of cyclic enol ethers via nonclassical Wittig olefinations of the esters. Solid-phase synthesis represents a method of choice, particularly for the synthesis of peptides. This route is compatible with traditional Merrifield solid-phase peptide synthesis (SPPS), as documented on the preparation of the pentapeptide Leu-enkephalin amide H-Tyr-Gly-Gly-Phe-Leu-NH2 with Phe or Tyr replaced by a novel amino acid.
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Affiliation(s)
- Eva Schütznerová
- Institute of Molecular and Translation Medicine, Faculty of Medicine, Palacký University, Hněvotínská 5, Olomouc, 779 00, Czech Republic
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20
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Josa-Culleré L, Pretsch A, Pretsch D, Moloney MG. Antibacterial Mimics of Natural Products by Side-Chain Functionalization of Bicyclic Tetramic Acids. J Org Chem 2018; 83:10303-10317. [DOI: 10.1021/acs.joc.8b01453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laia Josa-Culleré
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G. Moloney
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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21
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Josa-Culleré L, Christensen KE, Moloney MG. Diastereoselective reduction of the tricarbonyl moiety in bicyclic tetramates giving pyroglutamates. Org Biomol Chem 2018; 16:2705-2710. [PMID: 29589033 DOI: 10.1039/c8ob00187a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The reduction of C(6)-acyl bicyclic tetramic acids has been achieved with complete diastereoselectivity via catalytic hydrogenation using PtO2. The resulting pyroglutamates had potent antibacterial and anticancer properties and will allow the preparation of simple mimics of pyroglutamate-containing natural products.
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Affiliation(s)
- Laia Josa-Culleré
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, UK.
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22
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Josa-Culleré L, Towers C, Thompson AL, Moloney MG. Chemoselective Formation and Reaction of Densely Functionalised Bicyclic Tetramic Acids and Their Biological Activity. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701393] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Laia Josa-Culleré
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Christopher Towers
- Department of Oncology; University of Oxford; Old Road Campus Research Building OX3 7LJ Oxford United Kingdom
| | - Amber L. Thompson
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Mark G. Moloney
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
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23
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Polic V, Cheong KJ, Hammerer F, Auclair K. Regioselective Epoxidations by Cytochrome P450 3A4 Using a Theobromine Chemical Auxiliary to Predictably Produce N-Protected β- or γ-Amino Epoxides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700637] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vanja Polic
- Department of Chemistry; McGill University; 801 Sherbrooke Street West Montreal, QC Canada H3A 0B8
| | - Kin Jack Cheong
- Department of Chemistry; McGill University; 801 Sherbrooke Street West Montreal, QC Canada H3A 0B8
| | - Fabien Hammerer
- Department of Chemistry; McGill University; 801 Sherbrooke Street West Montreal, QC Canada H3A 0B8
| | - Karine Auclair
- Department of Chemistry; McGill University; 801 Sherbrooke Street West Montreal, QC Canada H3A 0B8
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24
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X-Ray Crystallographic Analysis, EPR Studies, and Computational Calculations of a Cu(II) Tetramic Acid Complex. Bioinorg Chem Appl 2017; 2017:7895023. [PMID: 28316540 PMCID: PMC5337788 DOI: 10.1155/2017/7895023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 11/20/2016] [Accepted: 12/25/2016] [Indexed: 11/26/2022] Open
Abstract
In this work we present a structural and spectroscopic analysis of a copper(II) N-acetyl-5-arylidene tetramic acid by using both experimental and computational techniques. The crystal structure of the Cu(II) complex was determined by single crystal X-ray diffraction and shows that the copper ion lies on a centre of symmetry, with each ligand ion coordinated to two copper ions, forming a 2D sheet. Moreover, the EPR spectroscopic properties of the Cu(II) tetramic acid complex were also explored and discussed. Finally, a computational approach was performed in order to obtain a detailed and precise insight of product structures and properties. It is hoped that this study can enrich the field of functional supramolecular systems, giving place to the formation of coordination-driven self-assembly architectures.
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25
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Yu HL, Jiang SH, Bu XL, Wang JH, Weng JY, Yang XM, He KY, Zhang ZG, Ao P, Xu J, Xu MJ. Structural diversity of anti-pancreatic cancer capsimycins identified in mangrove-derived Streptomyces xiamenensis 318 and post-modification via a novel cytochrome P450 monooxygenase. Sci Rep 2017; 7:40689. [PMID: 28098172 PMCID: PMC5241641 DOI: 10.1038/srep40689] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 12/08/2016] [Indexed: 01/12/2023] Open
Abstract
Polycyclic tetramate macrolactams (PTMs) were identified as distinct secondary metabolites of the mangrove-derived Streptomyces xiamenensis 318. Together with three known compounds—ikarugamycin (1), capsimycin (2) and capsimycin B (3)—two new compounds, capsimycin C (4) with trans-diols and capsimycin D (5) with trans-configurations at C-13/C-14, have been identified. The absolute configurations of the tert/tert-diols moiety was determined in 4 by NMR spectroscopic analysis, CD spectral comparisons and semi-synthetic method. The post-modification mechanism of the carbocyclic ring at C-14/C-13 of compound 1 in the biosynthesis of an important intermediate 3 was investigated. A putative cytochrome P450 superfamily gene, SXIM_40690 (ikaD), which was proximally localized to the ikarugamycin biosynthetic pathway, was characterized. In vivo gene inactivation and complementation experiment confirmed that IkaD catalysed the epoxide-ring formation reaction and further hydroxylation of ethyl side chain to form capsimycin G (3′). Binding affinities and kinetic parameters for the interactions between ikarugamycin (1) and capsimycin B (3) with IkaD were measured with Surface Plasmon Resonance. The intermediate compound 3′ was isolated and identified as 30-hydroxyl-capsimycin B. The caspimycins 2 and 3, were transferred to methoxyl derivatives, 6 and 7, under acidic and heating conditions. Compounds 1–3 exhibited anti-proliferative activities against pancreatic carcinoma with IC50 values of 1.30–3.37 μM.
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Affiliation(s)
- He-Lin Yu
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Shu-Heng Jiang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xu-Liang Bu
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Institute of Oceanology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jia-Hua Wang
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Institute of Oceanology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jing-Yi Weng
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiao-Mei Yang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Kun-Yan He
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhi-Gang Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ping Ao
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jun Xu
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Institute of Oceanology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Min-Juan Xu
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China
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26
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Chen Y, Moloney JG, Christensen KE, Moloney MG. Fused-Ring Oxazolopyrrolopyridopyrimidine Systems with Gram-Negative Activity. Antibiotics (Basel) 2017; 6:antibiotics6010002. [PMID: 28098784 PMCID: PMC5372982 DOI: 10.3390/antibiotics6010002] [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: 12/06/2016] [Revised: 01/03/2017] [Accepted: 01/05/2017] [Indexed: 02/07/2023] Open
Abstract
Fused polyheterocyclic derivatives are available by annulation of a tetramate scaffold, and been shown to have antibacterial activity against a Gram-negative, but not a Gram-positive, bacterial strain. While the activity is not potent, these systems are structurally novel showing, in particular, a high level of polarity, and offer potential for the optimization of antibacterial activity.
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Affiliation(s)
- Yiyuan Chen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Jonathan G Moloney
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Kirsten E Christensen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Mark G Moloney
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
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27
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Abstract
Cladosin C was built up in ten steps comprising an N-acylation of dehydrovaline with a functionalised thioester, a Dieckmann cylisation, and an OH ⇒ NH2 exchange with 2,4-dimethoxybenzylamine.
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Affiliation(s)
- David Linder
- Department of Chemistry
- University Bayreuth
- D-95440 Bayreuth
- Germany
| | - Rainer Schobert
- Department of Chemistry
- University Bayreuth
- D-95440 Bayreuth
- Germany
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28
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Tan SWB, Chai CLL, Moloney MG. Mimics of pramanicin derived from pyroglutamic acid and their antibacterial activity. Org Biomol Chem 2017; 15:1889-1912. [DOI: 10.1039/c6ob02828d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Mono and dihydroxypyrrolidinones are readily available by direct oxygenation of a pyroglutamate-derived bicyclic lactam with high diastereoselectivity, and these may be manipulated further in protected or unprotected form by Grignard addition to a pendant Weinreb amide to give acylhydroxypyrrolidinones.
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Affiliation(s)
- Song Wei Benjamin Tan
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford
- UK
| | - Christina L. L. Chai
- Institute of Chemical and Engineering Sciences (ICES)
- Singapore 138665
- Singapore
- Department of Pharmacy
- National University of Singapore
| | - Mark G. Moloney
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford
- UK
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29
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Moloney MG. Natural Products as a Source for Novel Antibiotics. Trends Pharmacol Sci 2016; 37:689-701. [DOI: 10.1016/j.tips.2016.05.001] [Citation(s) in RCA: 161] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/02/2016] [Accepted: 05/02/2016] [Indexed: 01/04/2023]
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30
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Panduwawala TD, Josa-Culleré L, Kuprov I, Odell B, Moloney MG, Claridge TDW. Scalar Cross-Relaxation Detected in the NOESY Spectra of Oxazolidines and Thiazolidines. J Org Chem 2016; 81:4142-8. [DOI: 10.1021/acs.joc.6b00458] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tharindi D. Panduwawala
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Laia Josa-Culleré
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Ilya Kuprov
- School
of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, U.K
| | - Barbara Odell
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Mark G. Moloney
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Timothy D. W. Claridge
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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31
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Dhavan AA, Ionescu AC, Kaduskar RD, Brambilla E, Dallavalle S, Varoni EM, Iriti M. Antibacterial and antifungal activities of 2,3-pyrrolidinedione derivatives against oral pathogens. Bioorg Med Chem Lett 2016; 26:1376-80. [DOI: 10.1016/j.bmcl.2016.01.082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/28/2016] [Accepted: 01/29/2016] [Indexed: 10/22/2022]
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32
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(8R,10aS)-Methyl 2,4-diamino-8-(tert-butyl)-6-oxo-6,8,10,10a-tetrahydrooxazolo[3′′,4′′:1′,5′]-pyrrolo[3′,4′:5,6]pyrido[2,3-d]pyrimidine-10a-carboxylate. MOLBANK 2015. [DOI: 10.3390/m875] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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33
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Equisetin, reutericyclin and streptolodygin as natural product lead structures for novel antibiotic libraries. Future Med Chem 2015; 7:1861-77. [PMID: 26431450 DOI: 10.4155/fmc.15.97] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The emergence of antimicrobial resistance has created a need for the development of novel antibacterial therapies to treat infection. Natural products that exhibit antibacterial activity offer validated starting points for library generation, and the authors report here that small molecule mimics of tetramate-containing natural products may show antibacterial activity and offer the potential for further optimization.
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34
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Highlights from SelectBio 2015: Academic Drug Discovery Conference, Cambridge, UK, 19-20 May 2015. Future Med Chem 2015; 7:1839-42. [PMID: 26420379 DOI: 10.4155/fmc.15.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The SelectBio 2015: Academic Drug Discovery Conference was held in Cambridge, UK, on 19-20 May 2015. Building on the success of academic drug discovery events in the USA, this conference aimed to showcase the exciting new research emerging from academic drug discovery and to help bridge the gap between basic research and commercial application. At the event the authors heard from a number of speakers on a broad array of topics, from partnering models for academia and industry to novel drug discovery approaches across various therapeutic areas, with a few talks, such as those by Susanne Muller-Knapp (Structure Genomics Consortium, Oxford University, Oxford, UK) and Julian Blagg (Institute of Cancer Research, UK), covering both remits, by highlighting a number of such partnerships and then delving into some case studies. The conference concluded with a heated debate on whether phenotypic discovery should be favored over targeted discovery in academia and pharma, in a panel discussion chaired by Roland Wolkowicz (San Diego State University, USA).
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Trenner J, Prusov EV. A simple and efficient method for the preparation of 5-hydroxy-3-acyltetramic acids. Beilstein J Org Chem 2015; 11:323-7. [PMID: 25815086 PMCID: PMC4362042 DOI: 10.3762/bjoc.11.37] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 02/20/2015] [Indexed: 11/23/2022] Open
Abstract
Oxidation of the bisenolates of 3-acyltetramic acid to the corresponding 5-hydroxylated compounds using molecular oxygen is reported. The deprotection of the resulting compounds was also achieved.
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Affiliation(s)
- Johanna Trenner
- Department of Medicinal Chemistry, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany
| | - Evgeny V Prusov
- Department of Medicinal Chemistry, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany
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Jeong YC, Moloney MG. Antibacterial barbituric acid analogues inspired from natural 3-acyltetramic acids; synthesis, tautomerism and structure and physicochemical property-antibacterial activity relationships. Molecules 2015; 20:3582-627. [PMID: 25710842 PMCID: PMC6272196 DOI: 10.3390/molecules20033582] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 02/05/2015] [Accepted: 02/12/2015] [Indexed: 12/13/2022] Open
Abstract
The synthesis, tautomerism and antibacterial activity of novel barbiturates is reported. In particular, 3-acyl and 3-carboxamidobarbiturates exhibited antibacterial activity, against susceptible and some resistant Gram-positive strains of particular interest is that these systems possess amenable molecular weight, rotatable bonds and number of proton-donors/acceptors for drug design as well as less lipophilic character, with physicochemical properties and ionic states that are similar to current antibiotic agents for oral and injectable use. Unfortunately, the reduction of plasma protein affinity by the barbituric core is not sufficient to achieve activity in vivo. Further optimization to reduce plasma protein affinity and/or elevate antibiotic potency is therefore required, but we believe that these systems offer unusual opportunities for antibiotic drug discovery.
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Affiliation(s)
- Yong-Chul Jeong
- Chemistry Research Laboratory, Mansfield Rd, University of Oxford, OX1 3TA, UK.
| | - Mark G Moloney
- Chemistry Research Laboratory, Mansfield Rd, University of Oxford, OX1 3TA, UK.
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Ganihigama DU, Sureram S, Sangher S, Hongmanee P, Aree T, Mahidol C, Ruchirawat S, Kittakoop P. Antimycobacterial activity of natural products and synthetic agents: Pyrrolodiquinolines and vermelhotin as anti-tubercular leads against clinical multidrug resistant isolates of Mycobacterium tuberculosis. Eur J Med Chem 2015; 89:1-12. [DOI: 10.1016/j.ejmech.2014.10.026] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 10/09/2014] [Accepted: 10/10/2014] [Indexed: 11/28/2022]
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Chen RY, Tian D, Li YW, Lv YB, Sun HW, Chang Z, Bu XH. A new anionic metal–organic framework showing tunable emission by lanthanide(III) doping and highly selective CO2 adsorption properties. RSC Adv 2015. [DOI: 10.1039/c5ra02935j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A 3D porous anionic MOF (1), decorated with -NH2 and N sites, can serve as a host for the encapsulation of lanthanide(iii) cations for emission tuning. Besides, it also shows high adsorption selectivity for CO2 over CH4 and N2 at 273 K.
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Affiliation(s)
- Rong-Ying Chen
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Dan Tian
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Yun-Wu Li
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Ying-Bin Lv
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Hong-Wei Sun
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Ze Chang
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
| | - Xian-He Bu
- Department of Chemistry
- TKL of Metal- and Molecule-Based Material Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry (MOE), and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Nankai University
- Tianjin 300071
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Kim MO, Feng X, Feixas F, Zhu W, Lindert S, Bogue S, Sinko W, de Oliveira C, Rao G, Oldfield E, McCammon JA. A Molecular Dynamics Investigation of Mycobacterium tuberculosis Prenyl Synthases: Conformational Flexibility and Implications for Computer-aided Drug Discovery. Chem Biol Drug Des 2014; 85:756-69. [PMID: 25352216 DOI: 10.1111/cbdd.12463] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 09/26/2014] [Accepted: 10/17/2014] [Indexed: 01/09/2023]
Abstract
With the rise in antibiotic resistance, there is interest in discovering new drugs active against new targets. Here, we investigate the dynamic structures of three isoprenoid synthases from Mycobacterium tuberculosis using molecular dynamics (MD) methods with a view to discovering new drug leads. Two of the enzymes, cis-farnesyl diphosphate synthase (cis-FPPS) and cis-decaprenyl diphosphate synthase (cis-DPPS), are involved in bacterial cell wall biosynthesis, while the third, tuberculosinyl adenosine synthase (Rv3378c), is involved in virulence factor formation. The MD results for these three enzymes were then compared with previous results on undecaprenyl diphosphate synthase (UPPS) by means of active site volume fluctuation and principal component analyses. In addition, an analysis of the binding of prenyl diphosphates to cis-FPPS, cis-DPPS, and UPPS utilizing the new MD results is reported. We also screened libraries of inhibitors against cis-DPPS, finding ~1 μm inhibitors, and used the receiver operating characteristic-area under the curve (ROC-AUC) method to test the predictive power of X-ray and MD-derived cis-DPPS receptors. We found that one compound with potent M. tuberculosis cell growth inhibition activity was an IC(50) ~0.5- to 20-μm inhibitor (depending on substrate) of cis-DPPS, a ~660-nm inhibitor of Rv3378c as well as a 4.8-μm inhibitor of cis-FPPS, opening up the possibility of multitarget inhibition involving both cell wall biosynthesis and virulence factor formation.
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Affiliation(s)
- Meekyum Olivia Kim
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92093, USA
| | - Xinxin Feng
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Ferran Feixas
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA
| | - Wei Zhu
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Steffen Lindert
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA.,Howard Hughes Medical Institute, University of California San Diego, La Jolla, CA, 92093, USA
| | - Shannon Bogue
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - William Sinko
- Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA
| | - César de Oliveira
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92093, USA.,Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA.,Howard Hughes Medical Institute, University of California San Diego, La Jolla, CA, 92093, USA
| | - Guodong Rao
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Eric Oldfield
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - James Andrew McCammon
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92093, USA.,Department of Pharmacology, University of California San Diego, La Jolla, CA, 92093, USA.,Howard Hughes Medical Institute, University of California San Diego, La Jolla, CA, 92093, USA.,Center for Theoretical Biological Physics, University of California San Diego, La Jolla, CA, 92093, USA
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Tan SWB, Chai CLL, Moloney MG. Synthesis of 3-acyltetramates by side chain manipulation and their antibacterial activity. Org Biomol Chem 2014; 12:1711-6. [PMID: 24514071 DOI: 10.1039/c4ob00095a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for the introduction of 3-acyl side chain groups onto a core tetramate system, which are suitable for further manipulation by nucleophilic displacement or Horner-Wadsworth-Emmons coupling, provides access to a diverse library of substituted tetramates related to two distinct classes of natural products, equisetin and pramanicin. Assessment against S. aureus and E. coli indicated that some compounds exhibit significant antibacterial activity, providing unusual leads for further optimisation in the drug discovery process.
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Affiliation(s)
- Song Wei Benjamin Tan
- The Department of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
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41
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Hofferberth ML, Brückner R. α‐ and β‐Lipomycin: Total Syntheses by Sequential Stille Couplings and Assignment of the Absolute Configuration of All Stereogenic Centers. Angew Chem Int Ed Engl 2014; 53:7328-34. [DOI: 10.1002/anie.201402255] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
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42
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Hofferberth ML, Brückner R. α‐ und β‐Lipomycin: Totalsynthesen auf der Grundlage sequentieller Stille‐Kupplungen und Zuordnung der absoluten Konfiguration aller stereogenen Zentren. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402255] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
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43
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Jeong YC, Bikadi Z, Hazai E, Moloney MG. A Detailed Study of Antibacterial 3-Acyltetramic Acids and 3-Acylpiperidine-2,4-diones. ChemMedChem 2014; 9:1826-37. [DOI: 10.1002/cmdc.201402093] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Indexed: 12/12/2022]
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44
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Synthesis, antibiotic activity and structure–activity relationship study of some 3-enaminetetramic acids. Bioorg Med Chem Lett 2014; 24:1901-6. [DOI: 10.1016/j.bmcl.2014.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/05/2014] [Accepted: 03/06/2014] [Indexed: 01/31/2023]
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45
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N-Acetyl-5-arylidenetetramic acids: synthesis, X-ray structure elucidation and application to the preparation of zinc(II) and copper(II) complexes. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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46
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Jones RCF, Bullous JP, Law CCM, Elsegood MRJ. New routes towards reutericyclin analogues. Chem Commun (Camb) 2014; 50:1588-90. [PMID: 24382380 DOI: 10.1039/c3cc47867j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A range of N-acylpyrrolo[3,4-c]isoxazoles and derived N-acyltetramides has been prepared via a nitrile oxide dipolar cycloaddition approach, as analogues of the acyltetramic acid metabolite reutericyclin, of interest for its antibiotic potential against Gram-positive bacteria including hospital-acquired infections of resistant Clostridium difficile.
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Affiliation(s)
- Raymond C F Jones
- Department of Chemistry, Loughborough University, Leicester, LE11 3TU, UK.
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47
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Jeong YC, Moloney MG. Synthesis and antibacterial activity of monocyclic 3-carboxamide tetramic acids. Beilstein J Org Chem 2013; 9:1899-906. [PMID: 24204399 PMCID: PMC3817595 DOI: 10.3762/bjoc.9.224] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 08/23/2013] [Indexed: 11/23/2022] Open
Abstract
A chemical library of carboxamide-substituted tetramates designed by analogy with antibacterial natural products, a method for their rapid construction, and the evaluation of their antibacterial activity is reported.
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Affiliation(s)
- Yong-Chul Jeong
- Chemistry Research Laboratory, University of Oxford, Mansfield Rd, University of Oxford, OX1 3TA, UK
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48
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Anwar M, Moloney MG. Chiral Bicyclic Tetramates as Non-Planar Templates for Chemical Library Synthesis. Chem Biol Drug Des 2013; 81:645-9. [DOI: 10.1111/cbdd.12110] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 01/15/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Muhammad Anwar
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
| | - Mark G. Moloney
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
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