1
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Wang P, Fares M, Eladwy RA, Bhuyan DJ, Wu X, Lewis W, Loeb SJ, Macreadie LK, Gale PA. Platinum-based metal complexes as chloride transporters that trigger apoptosis. Chem Sci 2024; 15:11584-11593. [PMID: 39055016 PMCID: PMC11268493 DOI: 10.1039/d4sc02115k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Accepted: 06/21/2024] [Indexed: 07/27/2024] Open
Abstract
In this paper we demonstrate that Pt(ii) complexes can function as efficient transmembrane chloride transporters. A series of Pt(ii) metal complexes with urea-appended isoquinoline ligands were synthesised and operate via classical hydrogen bonding interactions rather than ligand exchange. A number of the complexes exhibited potent transmembrane chloride activity in vesicle studies, while also showing strong antiproliferative activity in cisplatin-resistant cell lines via induction of apoptosis and inhibition of intracellular ROS.
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Affiliation(s)
- Patrick Wang
- School of Chemistry, The University of Sydney NSW 2006 Australia
| | - Mohamed Fares
- School of Pharmacy, The University of Sydney NSW 2006 Australia
| | - Radwa A Eladwy
- NICM, Research Health Institute, Western Sydney University NSW 2751 Australia
| | - Deep J Bhuyan
- NICM, Research Health Institute, Western Sydney University NSW 2751 Australia
| | - Xin Wu
- School of Pharmaceutical Sciences, Xiamen University Xiamen 361102 Fujian China
| | - William Lewis
- School of Chemistry, The University of Sydney NSW 2006 Australia
| | - Stephen J Loeb
- Department of Chemistry and Biochemistry, University of Windsor Ontario N9B 3P4 Canada
| | | | - Philip A Gale
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney Ultimo NSW 2007 Australia
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2
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Picci G, Montis R, Lippolis V, Caltagirone C. Squaramide-based receptors in anion supramolecular chemistry: insights into anion binding, sensing, transport and extraction. Chem Soc Rev 2024; 53:3952-3975. [PMID: 38465875 DOI: 10.1039/d3cs01165h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Over the last 15 years, squaramide-based receptors have attracted the attention of supramolecular chemists working in the field of anion recognition. Herein, we highlight examples of squaramide-based receptors that are able to bind, sense, extract and transport anions.
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Affiliation(s)
- Giacomo Picci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, Monserrato (CA) 09042, Italy.
| | - Riccardo Montis
- Department of Pure and Applied Science, University of Urbino, Via della Stazione 4, Urbino I-61029, Italy.
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, Monserrato (CA) 09042, Italy.
| | - Claudia Caltagirone
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, Monserrato (CA) 09042, Italy.
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3
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Chvojka M, Madea D, Valkenier H, Šindelář V. Tuning CH Hydrogen Bond-Based Receptors toward Picomolar Anion Affinity via the Inductive Effect of Distant Substituents. Angew Chem Int Ed Engl 2023:e202318261. [PMID: 38063265 DOI: 10.1002/anie.202318261] [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: 11/29/2023] [Indexed: 12/23/2023]
Abstract
Inspired by nature, artificial hydrogen bond-based anion receptors have been developed to achieve high anion selectivity; however, their binding affinity is usually low. The potency of these receptors is usually increased by the introduction of aryl substituents, which withdraw electrons from their binding site through the resonance effect. Here, we show that the polarization of the C(sp3 )-H binding site of bambusuril receptors, and thus their potency to bind anions, can be modulated by the inductive effect. The presence of electron-withdrawing groups on benzyl substituents of bambusurils significantly increases their binding affinities to halides, resulting in the strongest iodide receptor reported to date with an association constant greater than 1013 M-1 in acetonitrile. A Hammett plot showed that while the bambusuril affinity toward halides linearly increases with the electron-withdrawing power of their substituents, their binding selectivity remains essentially unchanged.
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Affiliation(s)
- Matúš Chvojka
- Department of Chemistry, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
- RECETOX, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
- Engineering of Molecular NanoSystems, École polytechnique de Bruxelles, Université libre de Bruxelles, Avenue F.D. Roosevelt 50, CP165/64, 1050, Brussels, Belgium
| | - Dominik Madea
- Department of Chemistry, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
- RECETOX, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Hennie Valkenier
- Engineering of Molecular NanoSystems, École polytechnique de Bruxelles, Université libre de Bruxelles, Avenue F.D. Roosevelt 50, CP165/64, 1050, Brussels, Belgium
| | - Vladimír Šindelář
- Department of Chemistry, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
- RECETOX, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
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4
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de Jong J, Bos JE, Wezenberg SJ. Stimulus-Controlled Anion Binding and Transport by Synthetic Receptors. Chem Rev 2023; 123:8530-8574. [PMID: 37342028 PMCID: PMC10347431 DOI: 10.1021/acs.chemrev.3c00039] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Indexed: 06/22/2023]
Abstract
Anionic species are omnipresent and involved in many important biological processes. A large number of artificial anion receptors has therefore been developed. Some of these are capable of mediating transmembrane transport. However, where transport proteins can respond to stimuli in their surroundings, creation of synthetic receptors with stimuli-responsive functions poses a major challenge. Herein, we give a full overview of the stimulus-controlled anion receptors that have been developed thus far, including their application in membrane transport. In addition to their potential operation as membrane carriers, the use of anion recognition motifs in forming responsive membrane-spanning channels is discussed. With this review article, we intend to increase interest in transmembrane transport among scientists working on host-guest complexes and dynamic functional systems in order to stimulate further developments.
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Affiliation(s)
| | | | - Sander J. Wezenberg
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333
CC Leiden, The Netherlands
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5
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MacDermott-Opeskin H, Clarke C, Wu X, Roseblade A, York E, Pacchini E, Roy R, Cranfield C, Gale PA, O'Mara ML, Murray M, Rawling T. Protonophoric and mitochondrial uncoupling activity of aryl-carbamate substituted fatty acids. Org Biomol Chem 2022; 21:132-139. [PMID: 36453203 DOI: 10.1039/d2ob02049a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Aryl-urea substituted fatty acids are protonophores and mitochondrial uncouplers that utilise a urea-based synthetic anion transport moiety to carry out the protonophoric cycle. Herein we show that replacement of the urea group with carbamate, a functional group not previously reported to possess anion transport activity, produces analogues that retain the activity of their urea counterparts. Thus, the aryl-carbamate substituted fatty acids uncouple oxidative phosphorylation and inhibit ATP production by collapsing the mitochondrial proton gradient. Proton transport proceeds via self-assembly of the deprotonated aryl-carbamates into membrane permeable dimeric species, formed by intermolecular binding of the carboxylate group to the carbamate moiety. These results highlight the anion transport capacity of the carbamate functional group.
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Affiliation(s)
- Hugo MacDermott-Opeskin
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT, 0200, Australia
| | - Callum Clarke
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Xin Wu
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.,School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Ariane Roseblade
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Ethan Pacchini
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Ritik Roy
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Charles Cranfield
- School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Philip A Gale
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.,The University of Sydney Nano Institute (SydneyNano), The University of Sydney, NSW, 2006, Australia
| | - Megan L O'Mara
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT, 0200, Australia.,Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Michael Murray
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, NSW 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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6
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Marchetti LA, Krämer T, Elmes RBP. Amidosquaramides - a new anion binding motif with pH sensitive anion transport properties. Org Biomol Chem 2022; 20:7056-7066. [PMID: 35993191 DOI: 10.1039/d2ob01176j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Stimuli responsive anion transport is becoming an important aspect of supramolecular anion recognition chemistry. Herein, we report the synthesis of a family of anion receptors that incorporate a new anion binding motif, amidosquaramides. We show using experimental and computational methods that these receptors have pKa values close to physiological pH but also display intramolecular H-bonding interactions that affect anion recognition. Moreover, moderate activity in a Cl-/NO3- exchange assay is observed at physiological pH that can be effectively 'switched on' when repeated under acidic conditions. The reported findings provide synthetic methods that can be used for the construction of more complex squaramide based anion receptors and also provide insight into the importance of conformational analysis when considering receptor design.
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Affiliation(s)
- Luke A Marchetti
- Department of Chemistry, National University of Ireland Maynooth, Maynooth, Ireland.
| | - Tobias Krämer
- Department of Chemistry, National University of Ireland Maynooth, Maynooth, Ireland.
| | - Robert B P Elmes
- Department of Chemistry, National University of Ireland Maynooth, Maynooth, Ireland. .,Synthesis and Solid State Pharmaceutical Centre (SSPC), Ireland
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7
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Ion transporters: emerging agents for anticancer therapy. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1258-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Kavanagh ON, Bhattacharya S, Marchetti L, Elmes R, O’Sullivan F, Farragher JP, Robinson S, Thompson D, Walker GM. Hydroxychloroquine Does Not Function as a Direct Zinc Ionophore. Pharmaceutics 2022; 14:pharmaceutics14050899. [PMID: 35631485 PMCID: PMC9147311 DOI: 10.3390/pharmaceutics14050899] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/11/2022] [Accepted: 04/15/2022] [Indexed: 02/04/2023] Open
Abstract
Drug-mediated correction of abnormal biological zinc homeostasis could provide new routes to treating neurodegeneration, cancer, and viral infections. Designing therapeutics to facilitate zinc transport intracellularly is hampered by inadequate concentrations of endogenous zinc, which is often protein-bound in vivo. We found strong evidence that hydroxychloroquine, a drug used to treat malaria and employed as a potential treatment for COVID-19, does not bind and transport zinc across biological membranes through ionophoric mechanisms, contrary to recent claims. In vitro complexation studies and liposomal transport assays are correlated with cellular zinc assays in A549 lung epithelial cells to confirm the indirect mechanism of hydroxychloroquine-mediated elevation in intracellular zinc without ionophorism. Molecular simulations show hydroxychloroquine-triggered helix perturbation in zinc-finger protein without zinc chelation, a potential alternative non-ionophoric mechanism.
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Affiliation(s)
- Oisín N. Kavanagh
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- School of Pharmacy, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
- Department of Chemical Sciences, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
- Department of Chemistry, Maynooth University (National University of Ireland), W23 F2H6 Maynooth, Ireland
- National Institute for Cellular Biotechnology, Dublin City University, D09 NR58 Dublin, Ireland
- Correspondence:
| | - Shayon Bhattacharya
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Department of Physics, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Luke Marchetti
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Department of Chemistry, Maynooth University (National University of Ireland), W23 F2H6 Maynooth, Ireland
| | - Robert Elmes
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Department of Chemistry, Maynooth University (National University of Ireland), W23 F2H6 Maynooth, Ireland
| | - Finbarr O’Sullivan
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- National Institute for Cellular Biotechnology, Dublin City University, D09 NR58 Dublin, Ireland
| | - John P. Farragher
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
| | - Shane Robinson
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Janssen Pharmaceutical Sciences, T45 P663 Cork, Ireland
| | - Damien Thompson
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Department of Physics, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Gavin M. Walker
- SSPC, The Science Foundation Ireland Research Centre for Pharmaceuticals, V94 T9PX Limerick, Ireland; (S.B.); (L.M.); (R.E.); (F.O.); (J.P.F.); (S.R.); (D.T.); (G.M.W.)
- Department of Chemical Sciences, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
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9
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A Simulation Model for the Non-Electrogenic Uniport Carrier-Assisted Transport of Ions across Lipid Membranes. MEMBRANES 2022; 12:membranes12030292. [PMID: 35323767 PMCID: PMC8955484 DOI: 10.3390/membranes12030292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 02/24/2022] [Accepted: 03/01/2022] [Indexed: 12/10/2022]
Abstract
Impressive work has been completed in recent decades on the transmembrane anion transport capability of small synthetic transporters from many different structural classes. However, very few predicting models have been proposed for the fast screening of compound libraries before spending time and resources on the laboratory bench for their synthesis. In this work, a new approach is presented which aims at describing the transport process by taking all the steps into explicit consideration, and includes all possible experiment-derived parameters. The algorithm is able to simulate the macroscopic experiments performed with lipid vesicles to assess the ion-transport ability of the synthetic transporters following a non-electrogenic uniport mechanism. While keeping calculation time affordable, the final goal is the curve-fitting of real experimental data—so, to obtain both an analysis and a predictive tool. The role and the relative weight of the different parameters is discussed and the agreement with the literature is shown by using the simulations of a virtual benchmark case. The fitting of real experimental curves is also shown for two transporters of different structural type.
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10
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Yang K, Boles JE, White LJ, Hilton KLF, Lai HY, Long Y, Hiscock JR, Haynes CJE. A water-soluble membrane transporter for biologically relevant cations. RSC Adv 2022; 12:27877-27880. [DOI: 10.1039/d2ra05314d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 09/09/2022] [Indexed: 11/21/2022] Open
Abstract
Synthetic ionophores are promising therapeutic targets, yet poor water solubility limits their potential for translation into the clinic. Here we report a water soluble, supramolecular self-associating amphiphile (SSA) with cation transport function.
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Affiliation(s)
- Kylie Yang
- Chemistry Department, UCL, 20 Gordon Street, London WC1H 0AJ, UK
| | - Jessica E. Boles
- School of Chemistry and Forensic Science, University of Kent, Canterbury, Kent, CT2 7NH, UK
| | - Lisa J. White
- School of Chemistry and Forensic Science, University of Kent, Canterbury, Kent, CT2 7NH, UK
| | - Kira L. F. Hilton
- School of Chemistry and Forensic Science, University of Kent, Canterbury, Kent, CT2 7NH, UK
| | - Hin Yuk Lai
- Chemistry Department, UCL, 20 Gordon Street, London WC1H 0AJ, UK
| | - Yifan Long
- Chemistry Department, UCL, 20 Gordon Street, London WC1H 0AJ, UK
| | - Jennifer R. Hiscock
- School of Chemistry and Forensic Science, University of Kent, Canterbury, Kent, CT2 7NH, UK
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11
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Binding and transport properties of a benzo[b]thiophene‐based mono‐(thio)urea library. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Mondal D, Ahmad M, Panwaria P, Upadhyay A, Talukdar P. Anion Recognition through Multivalent C-H Hydrogen Bonds: Anion-Induced Foldamer Formation and Transport across Phospholipid Membranes. J Org Chem 2021; 87:10-17. [PMID: 34908424 DOI: 10.1021/acs.joc.1c01408] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of triazole-cyanostilbene receptors were designed and synthesized. The receptor binds with the anions through various CH···anion hydrogen bonding interactions, where strong binding was observed for SO42- anions followed by Cl-, Br-, NO3-, and I-, calculated from the 1H NMR titration experiment. The NOESY NMR experiment of the receptor confirmed the formation of anion-induced folded conformation. The CH···anion hydrogen bonding interaction-mediated anion recognition and foldamer formation were further confirmed from geometry optimization studies of the anion-bound complex. The receptor transports Cl- anions efficiently compared to SO42- anions across the lipid bilayer membrane via a mobile carrier mechanism.
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Affiliation(s)
- Debashis Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Manzoor Ahmad
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Prakash Panwaria
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Avisikta Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
| | - Pinaki Talukdar
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, Maharashtra, India
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13
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Sandler I, Sharma S, Chan B, Ho J. Accurate Quantum Chemical Prediction of Gas-Phase Anion Binding Affinities and Their Structure-Binding Relationships. J Phys Chem A 2021; 125:9838-9851. [PMID: 34739245 DOI: 10.1021/acs.jpca.1c06648] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This paper systematically examines the performance of contemporary wavefunction and density functional theory methods to identify robust and cost-efficient methods for predicting gas-phase anion binding energies. This includes the local coupled cluster LNO-CCSD(T) and DLPNO-CCSD(T), as well as double-hybrid DSD-PBEP86-D3(BJ) and various hybrid functionals M06-2X, B3LYP-D3(BJ), ωB97M-V, and ωB97X-V. The focus is on dual-hydrogen-bonding anion receptors that are commonly found in supramolecular chemistry and organocatalysis, namely, (thio)ureas, deltamides, (thio)squaramides, and croconamides as well as the yet-to-be-explored rhodizonamides. Of the methods examined, M06-2X emerged as the overall best performing method as the other functionals including DSD-PBEP86-D3(BJ) and the local coupled cluster DLPNO-CCSD(T) method displayed systematic errors that increase with the degree of carbonylation of the receptors. Hybrid ONIOM models that employed semiempirical methods (PM7, GFN1-xTB, and GFN2-xTB) and "threefold"-corrected small-basis set potentials (HF-3c, B97-3c, and PBEh-3c) were explored, and the best models resulted in 50- to 500-fold reduction in CPU time compared to W1-local. These calculations provide important insight into the structure-binding relationships where there is a direct correlation between Brønsted acidity and anion binding affinity, though the strength of the correlation also depends on other factors such as hydrogen-bonding geometry and the geometrical distortion that the receptor needs to undergo to bind the anion.
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Affiliation(s)
- Isolde Sandler
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Shaleen Sharma
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Bun Chan
- Graduate School of Engineering, Nagasaki University, Bukyo-Machi 1-14, Nagasaki 852-8521, Japan
| | - Junming Ho
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
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14
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McNaughton DA, To TYT, Hawkins BA, Hibbs DE, Gale PA. Delivering anion transporters to lipid bilayers in water. Org Biomol Chem 2021; 19:9624-9628. [PMID: 34709282 DOI: 10.1039/d1ob02041b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Cyclodextrins have been employed as delivery agents for lipophilic anion transporters, which allow their incorporation into lipid bilayers without using an organic solvent or pre-incorporation.
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Affiliation(s)
| | - Tsz Ying Teresa To
- School of Chemistry (F11), The University of Sydney, NSW 2006, Australia. .,Chemistry, University of Southampton, Southampton, SO17 1BJ, UK
| | - Bryson A Hawkins
- School of Pharmacy, The University of Sydney, NSW 2006, Australia
| | - David E Hibbs
- School of Pharmacy, The University of Sydney, NSW 2006, Australia
| | - Philip A Gale
- School of Chemistry (F11), The University of Sydney, NSW 2006, Australia. .,The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, NSW 2006, Australia
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15
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McNaughton DA, Macreadie LK, Gale PA. Acridinone-based anion transporters. Org Biomol Chem 2021; 19:9659-9674. [PMID: 34515286 DOI: 10.1039/d1ob01545a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The arrangement of hydrogen bond donors around a central lipophilic scaffold has proven to be a successful strategy in the development of potent chloride transporters. In this work, we revisit an acridinone 1,9-bis(thio)urea motif which had previously shown promise as an anion sensor and expand the series of compounds by appending a variety of electron-withdrawing groups to the peripheral phenyl moieties. High levels of activity were achieved by the most effective compounds in the series, which facilitated strictly electroneutral transport.
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Affiliation(s)
| | - Lauren K Macreadie
- School of Chemistry (F11), The University of Sydney, NSW 2006, Australia.
| | - Philip A Gale
- School of Chemistry (F11), The University of Sydney, NSW 2006, Australia. .,The University of Sydney Nano Institute (SydneyNano), The University of Sydney, NSW 2006, Australia
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16
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Martínez-Crespo L, Halgreen L, Soares M, Marques I, Félix V, Valkenier H. Hydrazones in anion transporters: the detrimental effect of a second binding site. Org Biomol Chem 2021; 19:8324-8337. [PMID: 34523662 DOI: 10.1039/d1ob01279g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Synthetic anion transporters can be developed using anion receptors that are able to bind the anion and stabilize it in the lipophilic interior of a bilayer membrane, and they usually contain functional groups with acidic NHs, such as ureas, thioureas and squaramides. To assess the suitability of acylhydrazones as a new functional group for the preparation of anion transporters, we have studied a family of thioureas functionalized with these and related functional groups. 1H NMR titrations and DFT calculations indicate that the thioureas bearing acylhydrazone groups behave as chloride receptors with two separate binding sites, of which the acylhydrazone binds weaker than the thiourea. Chloride transport studies show that the additional binding site has a detrimental effect on thiourea-based transporters, and this phenomenon is also observed for bis(thio)ureas with two separate binding sites. We propose that the presence of a second anion binding unit hinders the transport activity of the thiourea due to additional interactions with the phospholipids of the membrane. In agreement with this hypothesis, extensive molecular dynamics simulations suggest that the molecules will tend to be positioned in the water/lipid interface, driven by the interaction of the NHs of the thiourea and of the acylhydrazone groups with the POPC polar head groups and water molecules. Moreover, the interaction energies show that the poorest transporters have indeed the strongest interactions with the membrane phospholipids, inhibiting chloride transport. This detrimental effect of additional functional groups on transport activity should be considered when designing new ion transporters, unless these groups cooperatively promote anion recognition and transmembrane transport.
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Affiliation(s)
- Luis Martínez-Crespo
- Université Libre de Bruxelles (ULB), Engineering of Molecular NanoSystems, Ecole Polytechnique de Bruxelles, Avenue F.D. Roosevelt 50, CP165/64, B-1050 Brussels, Belgium.
| | - Lau Halgreen
- Université Libre de Bruxelles (ULB), Engineering of Molecular NanoSystems, Ecole Polytechnique de Bruxelles, Avenue F.D. Roosevelt 50, CP165/64, B-1050 Brussels, Belgium.
| | - Márcio Soares
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.
| | - Igor Marques
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.
| | - Vítor Félix
- CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal.
| | - Hennie Valkenier
- Université Libre de Bruxelles (ULB), Engineering of Molecular NanoSystems, Ecole Polytechnique de Bruxelles, Avenue F.D. Roosevelt 50, CP165/64, B-1050 Brussels, Belgium.
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17
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Lavanya M, Haribabu J, Ramaiah K, Suresh Yadav C, Kumar Chitumalla R, Jang J, Karvembu R, Varada Reddy A, Jagadeesh M. 2′-Thiophenecarboxaldehyde derived thiosemicarbazone metal complexes of copper(II), palladium(II) and zinc(II) ions: Synthesis, spectroscopic characterization, anticancer activity and DNA binding studies. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120440] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Herschede SR, Gneid H, Dent T, Jaeger EB, Lawson LB, Busschaert N. Bactericidal urea crown ethers target phosphatidylethanolamine membrane lipids. Org Biomol Chem 2021; 19:3838-3843. [PMID: 33949594 DOI: 10.1039/d1ob00263e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
An increasing number of people are infected with antibiotic-resistant bacteria each year, sometimes with fatal consequences. In this manuscript, we report a novel urea-functionalized crown ether that can bind to the bacterial lipid phosphatidylethanolamine (PE), facilitate PE flip-flop and displays antibacterial activity against the Gram-positive bacterium Bacillus cereus with a minimum inhibitory concentration comparable to that of the known PE-targeting lantibiotic duramycin.
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Affiliation(s)
- Sarah R Herschede
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
| | - Hassan Gneid
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
| | - Taylor Dent
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
| | - Ellen B Jaeger
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
| | - Louise B Lawson
- Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA
| | - Nathalie Busschaert
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
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19
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Zakrzewski M, Piątek P. Heteroditopic receptor flexibility – an important design principle for effective ion pair extractants based on carboxylate studies. NEW J CHEM 2021. [DOI: 10.1039/d1nj03353k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Potassium carboxylate salt binding and extraction experiments of a heteroditopic receptor series reveal that conformational freedom is an important factor affecting salt extraction efficiency.
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Affiliation(s)
- Maciej Zakrzewski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Piotr Piątek
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
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20
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Schettini R, Tosolini M, ur Rehman J, Shah MR, Pierri G, Tedesco C, Della Sala G, De Riccardis F, Tecilla P, Izzo I. Role of Lipophilicity in the Activity of Hexameric Cyclic Peptoid Ion Carriers. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001401] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Rosaria Schettini
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
| | - Massimo Tosolini
- Dipartimento di Scienze Chimiche e Farmaceutiche Università degli Studi di Trieste Via Giorgieri 1 34127 Trieste Italy
| | - Jawad ur Rehman
- Dipartimento di Scienze Chimiche e Farmaceutiche Università degli Studi di Trieste Via Giorgieri 1 34127 Trieste Italy
- H.E. J. Research Institute of Chemistry International Center for Chemical and Biological Sciences University of Karachi Karachi 75270 Pakistan
| | - Muhammed Raza Shah
- H.E. J. Research Institute of Chemistry International Center for Chemical and Biological Sciences University of Karachi Karachi 75270 Pakistan
| | - Giovanni Pierri
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
| | - Consiglia Tedesco
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
| | - Giorgio Della Sala
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
| | - Francesco De Riccardis
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
| | - Paolo Tecilla
- Dipartimento di Matematica Geoscienze Università degli Studi di Trieste Via Weiss 8 34127 Trieste Italy
| | - Irene Izzo
- Dipartimento di Chimica e Biologia “A. Zambelli” Università degli Studi di Salerno Via Giovanni Paolo II, 132 84084 Fisciano Salerno Italy
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21
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Marshall SR, Singh A, Wagner JN, Busschaert N. Enhancing the selectivity of optical sensors using synthetic transmembrane ion transporters. Chem Commun (Camb) 2020; 56:14455-14458. [PMID: 33146644 DOI: 10.1039/d0cc06437h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Herein, we introduce a new method to optimize the properties of optical sensors, coined the transporter-liposome-fluorophore (TLF) approach. It is shown that this approach can greatly improve the selectivity of the sensor, increase the dynamic range and maintain the sensitivity of the original fluorophore.
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Affiliation(s)
- Sarah R Marshall
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA.
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22
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Engineering of stimuli-responsive lipid-bilayer membranes using supramolecular systems. Nat Rev Chem 2020; 5:46-61. [PMID: 37118103 DOI: 10.1038/s41570-020-00233-6] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2020] [Indexed: 12/13/2022]
Abstract
The membrane proteins found in nature control many important cellular functions, including signal transduction and transmembrane ion transport, and these, in turn, are regulated by external stimuli, such as small molecules, membrane potential and light. Membrane proteins also find technological applications in fields ranging from optogenetics to synthetic biology. Synthetic supramolecular analogues have emerged as a complementary method to engineer functional membranes. This Review describes stimuli-responsive supramolecular systems developed for the control of ion transport, signal transduction and catalysis in lipid-bilayer-membrane systems. Recent advances towards achieving spatio-temporal control over activity in artificial and living cells are highlighted. Current challenges, the scope, limitations and future potential to exploit supramolecular systems for engineering stimuli-responsive lipid-bilayer membranes are discussed.
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23
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Rawling T, MacDermott-Opeskin H, Roseblade A, Pazderka C, Clarke C, Bourget K, Wu X, Lewis W, Noble B, Gale PA, O'Mara ML, Cranfield C, Murray M. Aryl urea substituted fatty acids: a new class of protonophoric mitochondrial uncoupler that utilises a synthetic anion transporter. Chem Sci 2020; 11:12677-12685. [PMID: 34094462 PMCID: PMC8163295 DOI: 10.1039/d0sc02777d] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 08/10/2020] [Indexed: 01/21/2023] Open
Abstract
Respiring mitochondria establish a proton gradient across the mitochondrial inner membrane (MIM) that is used to generate ATP. Protein-independent mitochondrial uncouplers collapse the proton gradient and disrupt ATP production by shuttling protons back across the MIM in a protonophoric cycle. Continued cycling relies on the formation of MIM-permeable anionic species that can return to the intermembrane space after deprotonation in the mitochondrial matrix. Previously described protonophores contain acidic groups that are part of delocalised π-systems that provide large surfaces for charge delocalisation and facilitate anion permeation across the MIM. Here we present a new class of protonophoric uncoupler based on aryl-urea substituted fatty acids in which an acidic group and a π-system are separated by a long alkyl chain. The aryl-urea group in these molecules acts as a synthetic anion receptor that forms intermolecular hydrogen bonds with the fatty acid carboxylate after deprotonation. Dispersal of the negative charge across the aryl-urea system produces lipophilic dimeric complexes that can permeate the MIM and facilitate repeated cycling. Substitution of the aryl-urea group with lipophilic electron withdrawing groups is critical to complex lipophilicity and uncoupling activity. The aryl-urea substituted fatty acids represent the first biological example of mitochondrial uncoupling mediated by the interaction of a fatty acid and an anion receptor moiety, via self-assembly.
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Affiliation(s)
- Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney Sydney NSW 2007 Australia +61-2-9514-7956
| | - Hugo MacDermott-Opeskin
- Research School of Chemistry, College of Science, The Australian National University Canberra ACT 0200 Australia
| | - Ariane Roseblade
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney Sydney NSW 2007 Australia +61-2-9514-7956
| | - Curtis Pazderka
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney Sydney NSW 2007 Australia +61-2-9514-7956
| | - Callum Clarke
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney Sydney NSW 2007 Australia +61-2-9514-7956
| | - Kirsi Bourget
- Discipline of Pharmacology, School of Medical Sciences, University of Sydney Sydney NSW 2006 Australia
| | - Xin Wu
- School of Chemistry, University of Sydney Sydney NSW 2006 Australia
| | - William Lewis
- School of Chemistry, University of Sydney Sydney NSW 2006 Australia
| | - Benjamin Noble
- Research School of Chemistry, College of Science, The Australian National University Canberra ACT 0200 Australia
- School of Engineering, College of Science, Engineering and Health, RMIT University Melbourne VIC 3001 Australia
| | - Philip A Gale
- School of Chemistry, University of Sydney Sydney NSW 2006 Australia
| | - Megan L O'Mara
- Research School of Chemistry, College of Science, The Australian National University Canberra ACT 0200 Australia
| | - Charles Cranfield
- School of Life Sciences, Faculty of Science, University of Technology Sydney Sydney NSW 2007 Australia
| | - Michael Murray
- Discipline of Pharmacology, School of Medical Sciences, University of Sydney Sydney NSW 2006 Australia
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24
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Davis JT, Gale PA, Quesada R. Advances in anion transport and supramolecular medicinal chemistry. Chem Soc Rev 2020; 49:6056-6086. [PMID: 32692794 DOI: 10.1039/c9cs00662a] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Advances in anion transport by synthetic supramolecular systems are discussed in this article. Developments in the design of discrete molecular carriers for anions and supramolecular anion channels are reviewed followed by an overview of the use of these systems in biological systems as putative treatments for diseases such as cystic fibrosis and cancer.
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Affiliation(s)
- Jeffery T Davis
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
| | - Philip A Gale
- School of Chemistry (F11), The University of Sydney, NSW 2006, Australia.
| | - Roberto Quesada
- Departmento de Química, Universidad de Burgos, 09001 Burgos, Spain.
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25
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Kerckhoffs A, Langton MJ. Reversible photo-control over transmembrane anion transport using visible-light responsive supramolecular carriers. Chem Sci 2020; 11:6325-6331. [PMID: 32953027 PMCID: PMC7472928 DOI: 10.1039/d0sc02745f] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 06/04/2020] [Indexed: 12/15/2022] Open
Abstract
Supramolecular anion carriers responsive to visible light enable reversible two-colour photo-control over transmembrane anion transport.
Ion transport across lipid bilayer membranes in biology is controlled by membrane proteins, which in turn are regulated in response to chemical-, physical- and photo-stimuli. The design of synthetic supramolecular ion transporters able to be precisely controlled by external signals, in particular bio-compatible wavelengths of visible light, is key for achieving spatio-temporal control over function. Here we report two-colour responsive molecular photo-switches that act as supramolecular transmembrane anion carriers. Reversible switching of the photo-switch within the lipid bilayer membrane is achieved using biocompatible visible wavelengths of light, such that temporal control over transmembrane anion transport is achieved through alternating irradiation with red and blue light.
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Affiliation(s)
- Aidan Kerckhoffs
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Matthew J Langton
- Chemistry Research Laboratory , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
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26
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Fargher HA, Lau N, Richardson HC, Cheong PHY, Haley MM, Pluth MD, Johnson DW. Tuning Supramolecular Selectivity for Hydrosulfide: Linear Free Energy Relationships Reveal Preferential C-H Hydrogen Bond Interactions. J Am Chem Soc 2020; 142:8243-8251. [PMID: 32283020 DOI: 10.1021/jacs.0c00441] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Supramolecular anion receptors can be used to study the molecular recognition properties of the reactive yet biologically critical hydrochalcogenide anions (HCh-). Achieving selectivity for HCh- over the halides is challenging but necessary for not only developing future supramolecular probes for HCh- binding and detection, but also for understanding the fundamental properties that govern these binding and recognition events. Here we demonstrate that linear free energy relationships (LFERs)-including Hammett and Swain-Lupton plots-reveal a clear difference in sensitivity to the polarity of an aryl C-H hydrogen bond (HB) donor for HS- over other HCh- and halides. Analysis using electrostatic potential maps highlights that this difference in sensitivity results from a preference of the aryl C-H HB donor for HS- in this host scaffold. From this study, we demonstrate that LFERs are a powerful tool to gain interpretative insight into motif design for future anion-selective supramolecular receptors and highlight the importance of C-H HB donors for HS- recognition. From our results, we suggest that aryl C-H HB donors should be investigated in the next generation of HS- selective receptors based on the enhanced HS- selectivity over other competing anions in this system.
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Affiliation(s)
- Hazel A Fargher
- Department of Chemistry & Biochemistry, Materials Science Institute, and Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Nathanael Lau
- Department of Chemistry & Biochemistry, Materials Science Institute, and Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - H Camille Richardson
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Paul Ha-Yeon Cheong
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States
| | - Michael M Haley
- Department of Chemistry & Biochemistry, Materials Science Institute, and Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Michael D Pluth
- Department of Chemistry & Biochemistry, Materials Science Institute, and Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Darren W Johnson
- Department of Chemistry & Biochemistry, Materials Science Institute, and Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, Oregon 97403-1253, United States
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27
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Bickerton LE, Sterling AJ, Beer PD, Duarte F, Langton MJ. Transmembrane anion transport mediated by halogen bonding and hydrogen bonding triazole anionophores. Chem Sci 2020; 11:4722-4729. [PMID: 34122927 PMCID: PMC8159253 DOI: 10.1039/d0sc01467b] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Transmembrane ion transport by synthetic anionophores is typically achieved using polar hydrogen bonding anion receptors. Here we show that readily accessible halogen and hydrogen bonding 1,2,3-triazole derivatives can efficiently mediate anion transport across lipid bilayer membranes with unusual anti-Hofmeister selectivity. Importantly, the results demonstrate that the iodo-triazole systems exhibit the highest reported activity to date for halogen bonding anionophores, and enhanced transport efficiency relative to the hydrogen bonding analogues. In contrast, the analogous fluoro-triazole systems, which are unable to form intermolecular interactions with anions, are inactive. The halogen bonding anionophores also exhibit a remarkable intrinsic chloride over hydroxide selectivity, which is usually observed only in more complex anionophore designs, in contrast to the readily accessible acyclic systems reported here. This highlights the potential of iodo-triazoles as synthetically accessible and versatile motifs for developing more efficient anion transport systems. Computational studies provide further insight into the nature of the anion-triazole intermolecular interactions, examining the origins of the observed transport activity and selectivity of the systems, and revealing the role of enhanced charge delocalisation in the halogen bonding anion complexes. Halogen and hydrogen bonding 1,2,3-triazole derivatives efficiently mediate anion transport across lipid bilayer membranes with unusual anion selectivity profiles.![]()
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Affiliation(s)
- Laura E Bickerton
- Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Alistair J Sterling
- Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Paul D Beer
- Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Fernanda Duarte
- Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
| | - Matthew J Langton
- Chemistry Research Laboratory, University of Oxford Mansfield Road Oxford OX1 3TA UK
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28
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Lin Y, Hirschi WJ, Kunadia A, Paul A, Ghiviriga I, Abboud KA, Karugu RW, Vetticatt MJ, Hirschi JS, Seidel D. A Selenourea-Thiourea Brønsted Acid Catalyst Facilitates Asymmetric Conjugate Additions of Amines to α,β-Unsaturated Esters. J Am Chem Soc 2020; 142:5627-5635. [PMID: 32118419 PMCID: PMC7533150 DOI: 10.1021/jacs.9b12457] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
β-Amino esters are obtained with high levels of enantioselectivity via the conjugate addition of cyclic amines to unactivated α,β-unsaturated esters. A related strategy enables the kinetic resolution of racemic cyclic 2-arylamines, using benzyl acrylate as the resolving agent. Reactions are facilitated by an unprecedented selenourea-thiourea organocatalyst. As elucidated by DFT calculations and 13C kinetic isotope effect studies, the rate-limiting and enantiodetermining step of the reaction is the protonation of a zwitterionic intermediate by the catalyst. This represents a rare case in which a thiourea compound functions as an asymmetric Brønsted acid catalyst.
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Affiliation(s)
- Yingfu Lin
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - William J Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Anuj Kunadia
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Rachael W Karugu
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Mathew J Vetticatt
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Jennifer S Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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29
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Picci G, Kubicki M, Garau A, Lippolis V, Mocci R, Porcheddu A, Quesada R, Ricci PC, Scorciapino MA, Caltagirone C. Simple squaramide receptors for highly efficient anion binding in aqueous media and transmembrane transport. Chem Commun (Camb) 2020; 56:11066-11069. [DOI: 10.1039/d0cc04090h] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A family of acyclic squaramide receptors (L1–L5) have been synthesised with the aim to evaluate how the presence of additional H-bond donor groups on the squaramide scaffold could affect their affinity towards anions and transport ability.
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Affiliation(s)
- Giacomo Picci
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Maciej Kubicki
- Prof. dr hab. Maciej Kubicki
- Faculty of Chemistry
- Adam Mickiewicz University Umultowska 89b
- 61-614 Poznań
- Poland
| | - Alessandra Garau
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Rita Mocci
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Andrea Porcheddu
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Roberto Quesada
- Departamento de Quimica
- Facultad de Ciencias
- Universidad de Burgos
- 09001 Burgos
- Spain
| | - Pier Carlo Ricci
- Dipartimento di Fisica
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - M. Andrea Scorciapino
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
| | - Claudia Caltagirone
- Dipartimento di Scienze Chimiche e Geologiche
- Universita’degli Studi di Cagliari
- 09042 Monserrato
- Italy
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30
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Yu XH, Hong XQ, Mao QC, Chen WH. Biological effects and activity optimization of small-molecule, drug-like synthetic anion transporters. Eur J Med Chem 2019; 184:111782. [DOI: 10.1016/j.ejmech.2019.111782] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 10/08/2019] [Accepted: 10/09/2019] [Indexed: 12/27/2022]
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31
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Ross EE, Hoag B, Joslin I, Johnston T. Measurements of Ion Binding to Lipid-Hosted Ionophores by Affinity Chromatography. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9410-9421. [PMID: 31282163 DOI: 10.1021/acs.langmuir.9b01301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The binding affinity between antibiotic ionophores and alkali ions within supported lipid bilayers was evaluated using affinity chromatography. We used zonal elution and frontal analysis methods in nanovolume liquid chromatography to characterize the binding selectivity of the carrier and channel ionophores valinomycin and gramicidin A within different phosphatidylcholine bilayers. Distinct binding sensitivity to the lipid phase, both in affinity and selectivity, is observed for valinomycin, whereas gramicidin is less sensitive to changes in a membrane environment, behavior that is consistent with ion binding occurring within the interior of an established channel. There is good agreement between the chromatographic retention and the reported binding selectivity measured by other techniques. Surface potential near the binding site affects ion retention and the apparent association binding constants, but not the binding selectivity or enthalpy measurements. A model accounting for the surface potential contributions of retained ions during frontal analyses yields values close to intrinsic binding constants for gramicidin A (KA for K+ between 70 and 120 M-1) using reasonable estimates of the initial potential that is postulated to arise from the underlying silica.
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Affiliation(s)
- Eric E Ross
- Department of Chemistry & Biochemistry , Gonzaga University , Spokane , Washington 99258 , United States
| | - Bridget Hoag
- Department of Chemistry & Biochemistry , Gonzaga University , Spokane , Washington 99258 , United States
| | - Ian Joslin
- Department of Chemistry & Biochemistry , Gonzaga University , Spokane , Washington 99258 , United States
| | - Taylor Johnston
- Department of Chemistry & Biochemistry , Gonzaga University , Spokane , Washington 99258 , United States
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32
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Spooner MJ, Li H, Marques I, Costa PMR, Wu X, Howe ENW, Busschaert N, Moore SJ, Light ME, Sheppard DN, Félix V, Gale PA. Fluorinated synthetic anion carriers: experimental and computational insights into transmembrane chloride transport. Chem Sci 2019; 10:1976-1985. [PMID: 30881627 PMCID: PMC6381411 DOI: 10.1039/c8sc05155k] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 12/05/2018] [Indexed: 11/21/2022] Open
Abstract
A series of fluorinated tripodal tris-thioureas function as highly active anion transporters across lipid bilayers and cell membranes. Here, we investigate their mechanism of action using anion transport assays in cells and synthetic vesicles and molecular modelling of transporter-lipid interactions. When compared with non-fluorinated analogues, fluorinated compounds demonstrate a different mechanism of membrane transport because the free transporter cannot effectively diffuse through the membrane. As a result, in H+/Cl- cotransport assays, fluorinated transporters require the presence of oleic acid to form anionic oleate complexes for recycling of the transporter, whereas non-fluorinated analogues readily diffuse through the membrane as free transporters and show synergistic transport with the proton transporter gramicidin. Molecular dynamics simulations revealed markedly stronger transporter-lipid interactions for fluorinated compounds compared with non-fluorinated analogues and hence, higher energy barriers for fluorinated compounds to cross the membrane as free transporters. With use of appropriate proton transporters to ensure measurement of the correct rate-limiting steps, the transport rates determined in synthetic vesicle assays show excellent agreement with the anion transport rates determined in cell-based assays. We conclude that integration of computational and experimental methods provides a strategy to optimise transmembrane anion transporter design for biomedical applications.
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Affiliation(s)
| | - Hongyu Li
- School of Physiology, Pharmacology and Neuroscience , University of Bristol , Biomedical Sciences Building, University Walk , Bristol BS8 1TD , UK .
| | - Igor Marques
- Department of Chemistry , CICECO - Aveiro Institute of Materials , University of Aveiro , 3810-193 , Aveiro , Portugal .
| | - Pedro M R Costa
- Department of Chemistry , CICECO - Aveiro Institute of Materials , University of Aveiro , 3810-193 , Aveiro , Portugal .
| | - Xin Wu
- School of Chemistry , The University of Sydney , NSW 2006 , Australia .
| | - Ethan N W Howe
- School of Chemistry , The University of Sydney , NSW 2006 , Australia .
| | | | - Stephen J Moore
- Chemistry , University of Southampton , Southampton SO17 1BJ , UK
| | - Mark E Light
- Chemistry , University of Southampton , Southampton SO17 1BJ , UK
| | - David N Sheppard
- School of Physiology, Pharmacology and Neuroscience , University of Bristol , Biomedical Sciences Building, University Walk , Bristol BS8 1TD , UK .
| | - Vítor Félix
- Department of Chemistry , CICECO - Aveiro Institute of Materials , University of Aveiro , 3810-193 , Aveiro , Portugal .
| | - Philip A Gale
- Chemistry , University of Southampton , Southampton SO17 1BJ , UK
- School of Chemistry , The University of Sydney , NSW 2006 , Australia .
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33
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Carreira-Barral I, Rumbo C, Mielczarek M, Alonso-Carrillo D, Herran E, Pastor M, Del Pozo A, García-Valverde M, Quesada R. Small molecule anion transporters display in vitro antimicrobial activity against clinically relevant bacterial strains. Chem Commun (Camb) 2019; 55:10080-10083. [DOI: 10.1039/c9cc04304g] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Highly active transmembrane anion transporters have demonstrated their activity against antibiotic-resistant and clinically relevant bacterial strains.
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Affiliation(s)
| | - Carlos Rumbo
- Departamento de Química, Universidad de Burgos
- Burgos 09001
- Spain
- International Research Centre in Critical Raw Materials-ICCRAM
- Universidad de Burgos
| | | | | | - Enara Herran
- Biokeralty Research Institute AIE
- Hermanos Lumière 5
- 01510 Miñano
- Spain
| | - Marta Pastor
- Biokeralty Research Institute AIE
- Hermanos Lumière 5
- 01510 Miñano
- Spain
| | - Angel Del Pozo
- Biokeralty Research Institute AIE
- Hermanos Lumière 5
- 01510 Miñano
- Spain
| | | | - Roberto Quesada
- Departamento de Química, Universidad de Burgos
- Burgos 09001
- Spain
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34
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Zahran EM, Fatila EM, Chen CH, Flood AH, Bachas LG. Cyanostar: C–H Hydrogen Bonding Neutral Carrier Scaffold for Anion-Selective Sensors. Anal Chem 2018; 90:1925-1933. [DOI: 10.1021/acs.analchem.7b04008] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Elsayed M. Zahran
- Department
of Chemistry, University of Miami, Coral Gables, Florida 33126, United States
- Applied
Organic Chemistry Department, National Research Centre, Cairo, 12622, Egypt
| | - Elisabeth M. Fatila
- Department
of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Chun-Hsing Chen
- Department
of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Amar H. Flood
- Department
of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Leonidas G. Bachas
- Department
of Chemistry, University of Miami, Coral Gables, Florida 33126, United States
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35
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Luo Y, Ma H, Sun Y, Che P, Nie X, Wang T, Xu J. Understanding and Measurement for the Binding Energy of Hydrogen bonds of Biomass-Derived Hydroxyl Compounds. J Phys Chem A 2018; 122:843-848. [DOI: 10.1021/acs.jpca.7b10637] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yang Luo
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hong Ma
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
| | - Yuxia Sun
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Penghua Che
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
| | - Xin Nie
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
| | - Tianlong Wang
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
| | - Jie Xu
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,
Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China
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36
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Amendola V, Boiocchi M, Fabbrizzi L, La Cognata S, Legnani L, Lo Presti E, Mangano C, Miljkovic A. Anion-induced isomerization of fluorescent semi(thio)carbazones. Org Chem Front 2018. [DOI: 10.1039/c7qo00805h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An anion-controlled flapping motion has been observed in a series of novel semi(thio)carbazone molecules.
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Affiliation(s)
- Valeria Amendola
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Massimo Boiocchi
- Centro Grandi Strumenti
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Luigi Fabbrizzi
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Sonia La Cognata
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Laura Legnani
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Eliana Lo Presti
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Carlo Mangano
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
| | - Ana Miljkovic
- Dipartimento di Chimica
- Università degli Studi di Pavia
- Pavia
- Italy
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37
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Amos RIJ, Tyteca E, Talebi M, Haddad PR, Szucs R, Dolan JW, Pohl CA. Benchmarking of Computational Methods for Creation of Retention Models in Quantitative Structure–Retention Relationships Studies. J Chem Inf Model 2017; 57:2754-2762. [DOI: 10.1021/acs.jcim.7b00346] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ruth I. J. Amos
- Australian
Centre for Research on Separation Science (ACROSS), School of Physical
Sciences−Chemistry, University of Tasmania, Private Bag
75, Hobart 7001, Australia
| | - Eva Tyteca
- Australian
Centre for Research on Separation Science (ACROSS), School of Physical
Sciences−Chemistry, University of Tasmania, Private Bag
75, Hobart 7001, Australia
- Analytical
Chemistry, AgroBioChem Department, Gembloux Agro-Biotech, University of Liège, 2 Passage des Deportes, Gembloux 5030, Belgium
| | - Mohammad Talebi
- Australian
Centre for Research on Separation Science (ACROSS), School of Physical
Sciences−Chemistry, University of Tasmania, Private Bag
75, Hobart 7001, Australia
| | - Paul R. Haddad
- Australian
Centre for Research on Separation Science (ACROSS), School of Physical
Sciences−Chemistry, University of Tasmania, Private Bag
75, Hobart 7001, Australia
| | - Roman Szucs
- Pfizer Global Research and Development, Ramsgate Road, Sandwich CT13 9ND, U.K
| | - John W. Dolan
- LC Resources, 1795 NW Wallace
Road, McMinnville, Oregon 97128, United States
| | - Christopher A. Pohl
- Thermo Fisher Scientific, 490
Lakeside Drive, Sunnyvale, California 94085, United States
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38
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Jowett LA, Howe ENW, Soto-Cerrato V, Van Rossom W, Pérez-Tomás R, Gale PA. Indole-based perenosins as highly potent HCl transporters and potential anti-cancer agents. Sci Rep 2017; 7:9397. [PMID: 28839192 PMCID: PMC5570892 DOI: 10.1038/s41598-017-09645-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 07/24/2017] [Indexed: 11/19/2022] Open
Abstract
Prodigiosin is one of the most potent anion transporters in lipid bilayer membranes reported to date. Inspired by the structure of this natural product, we have recently designed and synthesised a new class of H+/Cl− cotransporters named ‘perenosins’. Here we report a new library of indole-based perenosins and their anion transport properties. The new transporters demonstrated superior transmembrane transport efficiency when compared to other indole-based transporters, due to favourable encapsulating effects from the substituents on the perenosin backbone. Anion transport assays were used to determine the mechanism of chloride transport revealing that the compounds function as ‘strict’ HCl cotransporters. Cell viability studies showed that some compounds specifically trigger late-onset cell death after 72 h with a unique correlation to the position of alkyl chains on the perenosins. Further investigations of cell death mechanism showed a mixture of cell cycle arrest and apoptosis was responsible for the observed decrease in cell viability.
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Affiliation(s)
- Laura A Jowett
- School of Chemistry (F11), The University of Sydney, 2006, Sydney, NSW, Australia
| | - Ethan N W Howe
- School of Chemistry (F11), The University of Sydney, 2006, Sydney, NSW, Australia
| | - Vanessa Soto-Cerrato
- Department of Pathology and Experimental Therapeutics, Cancer Cell Biology Research Group, University of Barcelona, Barcelona, Spain
| | - Wim Van Rossom
- Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Ricardo Pérez-Tomás
- Department of Pathology and Experimental Therapeutics, Cancer Cell Biology Research Group, University of Barcelona, Barcelona, Spain
| | - Philip A Gale
- School of Chemistry (F11), The University of Sydney, 2006, Sydney, NSW, Australia.
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39
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Aswathy V, Mary YS, Jojo P, Panicker CY, Bielenica A, Armaković S, Armaković SJ, Brzózka P, Krukowski S, Van Alsenoy C. Investigation of spectroscopic, reactive, transport and docking properties of 1-(3,4-dichlorophenyl)-3-[3-(trifluoromethyl)phenyl]thiourea (ANF-6): Combined experimental and computational study. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.01.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Nunes R, Costa PJ. Ion-Pair Halogen Bonds in 2-Halo-Functionalized Imidazolium Chloride Receptors: Substituent and Solvent Effects. Chem Asian J 2017; 12:586-594. [PMID: 28052536 DOI: 10.1002/asia.201601690] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 01/02/2017] [Indexed: 01/14/2023]
Abstract
The interaction of 2-halo-functionalized imidazolium derivatives (n-X+ ; X=Cl, Br, I) with a chloride anion through ion-pair halogen bonds (n-X⋅Cl) was studied by means of DFT and ab initio calculations. A method benchmark was performed on 2-bromo-1H-imidazol-3-ium in association with chloride (1-Br⋅Cl); MP2 yielded the best results when compared with CCSD(T) calculations. The interaction energies (ΔE) in the gas phase are high and, although the electrostatic interaction is strong owing to the ion-pair nature of the system, large X⋅⋅⋅Cl- Wiberg bond orders and contributions from charge transfer (nCl- →σ*C-X) are obtained. These values drop considerably in chloroform and water; this shows that solvent plays a role in modulating the interaction and that gas-phase calculations are particularly unrealistic for experimental applications. The introduction of electron-withdrawing groups in the 4,5-positions of the imidazolium (e.g., -NO2 , -F) increases the halogen-bond strength in both the gas phase and solvent, including water. The effect of the substituents on the 1,3-positions (N-H groups) also depends on the solvent. The variation of ΔE can be predicted through a two-parameter linear regression that optimizes the weights of charge-transfer and electrostatic interactions, which are different in vacuum and in solvent (chloroform and water). These results could be used in the rational design of efficient chloride receptors based on halogen bonds that work in solution, in particular, in an aqueous environment.
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Affiliation(s)
- Rafael Nunes
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
| | - Paulo J Costa
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
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41
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A synthetic ion transporter that disrupts autophagy and induces apoptosis by perturbing cellular chloride concentrations. Nat Chem 2017. [PMID: 28644464 DOI: 10.1038/nchem.2706] [Citation(s) in RCA: 193] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Perturbations in cellular chloride concentrations can affect cellular pH and autophagy and lead to the onset of apoptosis. With this in mind, synthetic ion transporters have been used to disturb cellular ion homeostasis and thereby induce cell death; however, it is not clear whether synthetic ion transporters can also be used to disrupt autophagy. Here, we show that squaramide-based ion transporters enhance the transport of chloride anions in liposomal models and promote sodium chloride influx into the cytosol. Liposomal and cellular transport activity of the squaramides is shown to correlate with cell death activity, which is attributed to caspase-dependent apoptosis. One ion transporter was also shown to cause additional changes in lysosomal pH, which leads to impairment of lysosomal enzyme activity and disruption of autophagic processes. This disruption is independent of the initiation of apoptosis by the ion transporter. This study provides the first experimental evidence that synthetic ion transporters can disrupt both autophagy and induce apoptosis.
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42
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Li Z, Chen Y, Yuan DQ, Chen WH. Synthesis of a dimeric 3α-hydroxy-7α,12α-diamino-5β-cholan-24-oate conjugate and its derivatives, and the effect of lipophilicity on their anion transport efficacy. Org Biomol Chem 2017; 15:2831-2840. [DOI: 10.1039/c7ob00289k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A dimeric 3α-hydroxy-7α,12α-diamino-5β-cholan-24-oate conjugate and its derivatives were synthesized, and lipophilicity was found to significantly affect their anion transport efficacy.
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Affiliation(s)
- Zhi Li
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Yun Chen
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - De-Qi Yuan
- Faculty of Pharmaceutical Sciences
- Kobe Gakuin University
- Kobe 650-8586
- Japan
| | - Wen-Hua Chen
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
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43
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Gale PA, Davis JT, Quesada R. Anion transport and supramolecular medicinal chemistry. Chem Soc Rev 2017; 46:2497-2519. [DOI: 10.1039/c7cs00159b] [Citation(s) in RCA: 219] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
New approaches to the transmembrane transport of anions are discussed in this review.
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Affiliation(s)
- Philip A. Gale
- School of Chemistry (F11)
- The University of Sydney
- Australia
| | - Jeffery T. Davis
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
| | - Roberto Quesada
- Departmento de Química
- Universidad de Burgos
- 09001 Burgos
- Spain
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44
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Yang Y, Wu X, Busschaert N, Furuta H, Gale PA. Dissecting the chloride–nitrate anion transport assay. Chem Commun (Camb) 2017; 53:9230-9233. [DOI: 10.1039/c7cc04912a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The chloride/nitrate selectivity of anion transporters in both binding and membrane transport is examined revealing the limitations of chloride–nitrate anion exchange assay.
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Affiliation(s)
- Yufeng Yang
- Chemistry
- University of Southampton
- Southampton
- UK
- Department of Chemistry and Biochemistry
| | - Xin Wu
- School of Chemistry
- The University of Sydney
- Australia
| | | | - Hiroyuki Furuta
- Department of Chemistry and Biochemistry
- Kyushu University
- Fukuoka
- Japan
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45
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Saha T, Gautam A, Mukherjee A, Lahiri M, Talukdar P. Chloride Transport through Supramolecular Barrel-Rosette Ion Channels: Lipophilic Control and Apoptosis-Inducing Activity. J Am Chem Soc 2016; 138:16443-16451. [DOI: 10.1021/jacs.6b10379] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Tanmoy Saha
- Department
of Chemistry and ‡Department of Biology, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Amitosh Gautam
- Department
of Chemistry and ‡Department of Biology, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Arnab Mukherjee
- Department
of Chemistry and ‡Department of Biology, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Mayurika Lahiri
- Department
of Chemistry and ‡Department of Biology, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Pinaki Talukdar
- Department
of Chemistry and ‡Department of Biology, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
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46
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Wu X, Gale PA. Small-Molecule Uncoupling Protein Mimics: Synthetic Anion Receptors as Fatty Acid-Activated Proton Transporters. J Am Chem Soc 2016; 138:16508-16514. [PMID: 27998096 DOI: 10.1021/jacs.6b10615] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Uncoupling proteins (UCPs) regulate energy expenditure in living cells by inducing proton leakage across the mitochondrial inner membrane, thereby uncoupling adenosine diphosphate phosphorylation from nutrient oxidation. The proton transport activity of UCP1 and UCP2 requires activation by fatty acids. We report here the first examples of synthetic neutral anion receptors performing this biologically important fatty acid-activated function in phospholipid bilayers. We have shown that a tripodal thiourea possesses poor H+/OH- transport activity without fatty acids, but in the presence of long-chain fatty acids is "switched on" as a proton transporter with an activity close to that of a commonly used protonophore. The fatty acid-enhanced proton transport was also observed for other hydrogen and halogen bond-based synthetic anion transporters. We propose that these compounds induce proton permeability by catalyzing transbilayer movement ("flip-flop") of anionic forms of fatty acids, so allowing the fatty acids to complete a proton transport cycle. Several lines of evidence have been provided to support such a fatty acid cycling mechanism. Our findings open up new applications of anion receptor chemistry and provide important clues for understanding biological activities of synthetic anion transporters and potentially the uncoupling mechanism of naturally occurring membrane proteins.
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Affiliation(s)
- Xin Wu
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
| | - Philip A Gale
- Chemistry, University of Southampton , Southampton SO17 1BJ, U.K
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47
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Bagwill C, Anderson C, Sullivan E, Manohara V, Murthy P, Kirkpatrick CC, Stalcup A, Lewis M. Predicting the Strength of Anion−π Interactions of Substituted Benzenes: the Development of Anion−π Binding Substituent Constants. J Phys Chem A 2016; 120:9235-9243. [DOI: 10.1021/acs.jpca.6b06276] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Christina Bagwill
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Christa Anderson
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Elizabeth Sullivan
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Varun Manohara
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Prithvi Murthy
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Charles C. Kirkpatrick
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
| | - Apryll Stalcup
- Irish
Separation Science Cluster, National Centre for Sensor Research, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Michael Lewis
- Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States
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48
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Li Z, Chen Y, Yin Y, Wang Z, Sun X. Convenient Synthesis of Unsymmetrical N,N′-disubstituted Thioureas in Water. JOURNAL OF CHEMICAL RESEARCH 2016. [DOI: 10.3184/174751916x14760947474916] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A simple and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted thioureas in good to excellent yields. Mild conditions, simple work-up, high yields as well as using water as solvent are the major advantages of the method.
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Affiliation(s)
- Zhengyi Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Yuan Chen
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Yue Yin
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Zhiming Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Xiaoqiang Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, 213164, P.R. China
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Sarhadinia S, Ebrahimi A. H-bond and dipole-dipole interactions between water and COO functional group in methyl benzoate derivatives: Substituent and heteroatom effects. J Mol Graph Model 2016; 70:7-13. [PMID: 27640072 DOI: 10.1016/j.jmgm.2016.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Revised: 09/02/2016] [Accepted: 09/05/2016] [Indexed: 10/21/2022]
Abstract
Interactions of COOCH3 functional group of methyl benzoate (MB) and its derivatives can substantially be affected by substituents and heteroatoms. The substituent and heteroatom effects on the intermolecular interactions in the complexes of MB and its derivatives with the water molecule have been investigated by the quantum mechanical calculations in the present study. Electron donating (ED)/electron withdrawing (EW) substituents increase/decrease the binding energy (ΔEbin) between mentioned functional group and hydrogen bond donor, and the N heteroatom in the six membered ring weakens the effect. The effects of the N heteroatoms depend on their positions in the ring, and the effects of substituents depend on the number and the positions of heteroatoms. Some relations were obtained between the dipole moment of carbonyl group, results obtained from the natural bond orbital (NBO) and the atoms in molecules (AIM) analysis, binding energy and Hammett constants of substituents. The results can be used to predict the factors affect the intermolecular interactions, and to improve the ligand-protein bindings in biological systems.
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Affiliation(s)
- S Sarhadinia
- Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran
| | - A Ebrahimi
- Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran.
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