1
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Chen J, Fasihianifard P, Raz AAP, Hickey BL, Moreno JL, Chang CEA, Hooley RJ, Zhong W. Selective recognition and discrimination of single isomeric changes in peptide strands with a host : guest sensing array. Chem Sci 2024; 15:1885-1893. [PMID: 38303931 PMCID: PMC10829040 DOI: 10.1039/d3sc06087j] [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: 11/14/2023] [Accepted: 12/30/2023] [Indexed: 02/03/2024] Open
Abstract
An indirect competitive binding mechanism can be exploited to allow a combination of cationic fluorophores and water-soluble synthetic receptors to selectively recognize and discriminate peptide strands containing a single isomeric residue in the backbone. Peptide isomerization occurs in long-lived proteins and has been linked with diseases such as Alzheimer's, cataracts and cancer, so isomers are valuable yet underexplored targets for selective recognition. Planar cationic fluorophores can selectively bind hydrophobic, Trp-containing peptide strands in solution, and when paired with receptors that provide a competitive host for the fluorophore, can form a differential sensing array that enables selective discrimination of peptide isomers. Residue variations such as D- and L-Asp, D- and L-isoAsp, D-Ser and D-Glu can all be recognized, simply by their effects on the folded structure of the flexible peptide. Molecular dynamics simulations were applied to determine the most favorable conformation of the peptide : fluorophore conjugate, indicating that favorable π-stacking with internal tryptophan residues in a folded binding pocket enables micromolar binding affinity.
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Affiliation(s)
- Junyi Chen
- Environmental Toxicology Graduate Program, University of California-Riverside Riverside CA 92521 USA
| | - Parisa Fasihianifard
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
| | - Alexie Andrea P Raz
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
| | - Briana L Hickey
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
| | - Jose L Moreno
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
| | - Chia-En A Chang
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
| | - Richard J Hooley
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
- Environmental Toxicology Graduate Program, University of California-Riverside Riverside CA 92521 USA
| | - Wenwan Zhong
- Department of Chemistry, University of California-Riverside Riverside CA 92521 USA
- Environmental Toxicology Graduate Program, University of California-Riverside Riverside CA 92521 USA
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2
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Chen J, Tabaie EZ, Hickey BL, Gao Z, Raz AAP, Li Z, Wilson EH, Hooley RJ, Zhong W. Selective Molecular Recognition and Indicator Displacement Sensing of Neurotransmitters in Cellular Environments. ACS Sens 2023; 8:3195-3204. [PMID: 37477362 DOI: 10.1021/acssensors.3c00886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
Flexible, water-soluble hosts are capable of selective molecular recognition in cellular environments and can detect neurotransmitters such as choline in cells. Both cationic and anionic water-soluble self-folded deep cavitands can recognize suitable styrylpyridinium dyes in cellular interiors. The dyes selectively accumulate in nucleotide-rich regions of the cell nucleus and cytoplasm. The hosts bind the dyes and promote their relocation to the outer cell membrane: the lipophilic cavitands predominantly reside in membrane environments but are still capable of binding suitable targets in other cellular organelles. Incubating the cells with structurally similar biomarkers such as choline, cholamine, betaine, or butyrylcholine illustrates the selective recognition. Choline and butyrylcholine can be bound by the hosts, but minimal binding is seen with betaine or cholamine. Varying the dye allows control of the optical detection method, and both "turn-on" sensing and "turn-off" sensing are possible.
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3
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Li J, Lei D, Ma Z, Zu B, Dou X. A General Twisted Intramolecular Charge Transfer Triggering Strategy by Protonation for Zero-Background Fluorescent Turn-On Sensing. J Phys Chem Lett 2022; 13:10871-10881. [PMID: 36394325 DOI: 10.1021/acs.jpclett.2c02847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The exploration of organic fluorescent sensing materials and mechanisms is of great significance, especially for the deep understanding of twisted intramolecular charge transfer (TICT). Here, the electron-donating ability of a chemically protonated amino group and the corresponding excitation primarily ensure the occurrence of excited-state intramolecular proton transfer. Due to the hybridization of the amino group from sp3 to sp2, the steric hindrance effect and conjugative effect together boost the rotation efficiency of the TICT process and the complete elimination of the background fluorescent signal. Furthermore, a sharp turn-on fluorescent detection of trace nitrite particulate with a diameter of 0.44 μm was realized. In addition, this protonation-induced change in the amino group configuration was verified through around nine categories of compounds. We expect this modulation of the photochemical activity path of the TICT process would greatly facilitate the exploration of novel fluorescent sensing mechanisms.
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Affiliation(s)
- Jiguang Li
- Xinjiang Key Laboratory of Explosives Safety Science, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Da Lei
- Xinjiang Key Laboratory of Explosives Safety Science, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Zhiwei Ma
- Xinjiang Key Laboratory of Explosives Safety Science, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Baiyi Zu
- Xinjiang Key Laboratory of Explosives Safety Science, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Xincun Dou
- Xinjiang Key Laboratory of Explosives Safety Science, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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4
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Das Saha N, Pradhan S, Sasmal R, Sarkar A, Berač CM, Kölsch JC, Pahwa M, Show S, Rozenholc Y, Topçu Z, Alessandrini V, Guibourdenche J, Tsatsaris V, Gagey-Eilstein N, Agasti SS. Cucurbit[7]uril Macrocyclic Sensors for Optical Fingerprinting: Predicting Protein Structural Changes to Identifying Disease-Specific Amyloid Assemblies. J Am Chem Soc 2022; 144:14363-14379. [PMID: 35913703 DOI: 10.1021/jacs.2c05969] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In a three-dimensional (3D) representation, each protein molecule displays a specific pattern of chemical and topological features, which are altered during its misfolding and aggregation pathway. Generating a recognizable fingerprint from such features could provide an enticing approach not only to identify these biomolecules but also to gain clues regarding their folding state and the occurrence of pathologically lethal misfolded aggregates. We report here a universal strategy to generate a fluorescent fingerprint from biomolecules by employing the pan-selective molecular recognition feature of a cucurbit[7]uril (CB[7]) macrocyclic receptor. We implemented a direct sensing strategy by covalently tethering CB[7] with a library of fluorescent reporters. When CB[7] recognizes the chemical and geometrical features of a biomolecule, it brings the tethered fluorophore into the vicinity, concomitantly reporting the nature of its binding microenvironment through a change in their optical signature. The photophysical properties of the fluorophores allow a multitude of probing modes, while their structural features provide additional binding diversity, generating a distinct fluorescence fingerprint from the biomolecule. We first used this strategy to rapidly discriminate a diverse range of protein analytes. The macrocyclic sensor was then applied to probe conformational changes in the protein structure and identify the formation of oligomeric and fibrillar species from misfolded proteins. Notably, the sensor system allowed us to differentiate between different self-assembled forms of the disease-specific amyloid-β (Aβ) aggregates and segregated them from other generic amyloid structures with a 100% identification accuracy. Ultimately, this sensor system predicted clinically relevant changes by fingerprinting serum samples from a cohort of pregnant women.
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Affiliation(s)
- Nilanjana Das Saha
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India.,Chemistry & Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Soumen Pradhan
- Chemistry & Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Ranjan Sasmal
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Aritra Sarkar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Christian M Berač
- Department of Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.,Graduate School of Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany
| | - Jonas C Kölsch
- Department of Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Meenakshi Pahwa
- Chemistry & Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Sushanta Show
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
| | - Yves Rozenholc
- UR 7537 BioSTM, Université Paris Cité, 4 avenue de l'Observatoire, 75006 Paris, France
| | - Zeki Topçu
- UR 7537 BioSTM, Université Paris Cité, 4 avenue de l'Observatoire, 75006 Paris, France
| | - Vivien Alessandrini
- INSERM UMR-S 1139, Université Paris Cité, 4 avenue de l'Observatoire, 75006 Paris, France.,Department of Obstetrics, Cochin Hospital, AP-HP, Université Paris Cité, FHU PREMA, 123 Bd Port-Royal, 75014 Paris, France
| | - Jean Guibourdenche
- INSERM UMR-S 1139, Université Paris Cité, 4 avenue de l'Observatoire, 75006 Paris, France.,Department of Obstetrics, Cochin Hospital, AP-HP, Université Paris Cité, FHU PREMA, 123 Bd Port-Royal, 75014 Paris, France
| | - Vassilis Tsatsaris
- INSERM UMR-S 1139, Université Paris Cité, 4 avenue de l'Observatoire, 75006 Paris, France.,Department of Obstetrics, Cochin Hospital, AP-HP, Université Paris Cité, FHU PREMA, 123 Bd Port-Royal, 75014 Paris, France
| | | | - Sarit S Agasti
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India.,Chemistry & Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore, Karnataka 560064, India
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5
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Abstract
ConspectusThis Account summarizes the progress in protein-calixarene complexation, tracing the developments from binary recognition to the glue activity of calixarenes and beyond to macrocycle-mediated frameworks. During the past 10 years, we have been tackling the question of protein-calixarene complexation in several ways, mainly by cocrystallization and X-ray structure determination as well as by solution state methods, NMR spectroscopy, isothermal titration calorimetry (ITC), and light scattering. Much of this work benefitted from collaboration, highlighted here. Our first breakthrough was the cocrystallization of cationic cytochrome c with sulfonato-calix[4]arene leading to a crystal structure defining three binding sites. Together with NMR studies, a dynamic complexation was deduced in which the calixarene explores the protein surface. Other cationic proteins were similarly amenable to cocrystallization with sulfonato-calix[4]arene, confirming calixarene-arginine/lysine encapsulation and consequent protein assembly. Calixarenes bearing anionic substituents such as sulfonate or phosphonate, but not carboxylate, have proven useful.Studies with larger calix[n]arenes (n = 6, 8) demonstrated the bigger better binder phenomenon with increased affinities and more interesting assemblies, including solution-state oligomerization and porous frameworks. While the calix[4]arene cavity accommodates a single cationic side chain, the larger macrocycles adopt different conformations, molding to the protein surface and accommodating several residues (hydrophobic, polar, and/or charged) in small cavities. In addition to accommodating protein features, the calixarene can bind exogenous components such as polyethylene glycol (PEG), metal ions, buffer, and additives. Ternary cocrystallization of cytochrome c, sulfonato-calix[8]arene, and spermine resulted in altered framework fabrication due to calixarene encapsulation of the tetraamine. Besides host-guest chemistry with exogenous components, the calixarene can also self-assemble, with numerous instances of macrocycle dimers.Calixarene complexation enables protein encapsulation, not merely side chain encapsulation. Cocrystal structures of sulfonato-calix[8]arene with cytochrome c or Ralstonia solanacearum lectin (RSL) provide evidence of encapsulation, with multiple calixarenes masking the same protein. NMR studies of cytochrome c and sulfonato-calix[8]arene are also consistent with multisite binding. In the case of RSL, a C3 symmetric trimer, up to six calixarenes bind the protein yielding a cubic framework mediated by calixarene dimers. Biomolecular calixarene complexation has evolved from molecular recognition to framework construction. This latter development contributes to the challenge in design and preparation of porous molecular materials. Cytochrome c and sulfonato-calix[8]arene form frameworks with >60% solvent in which the degree of porosity depends on the protein:calixarene ratio and the crystallization conditions. Recent developments with RSL led to three frameworks with varying porosity depending on the crystallization conditions, particularly the pH. NMR studies indicate a pH-triggered assembly in which two acidic residues appear to play key roles. The field of supramolecular protein chemistry is growing, and this Account aims to encourage new developments at the interface between biomolecular and synthetic/supramolecular chemistry.
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Affiliation(s)
- Peter B Crowley
- School of Biological and Chemical Sciences, University of Galway, University Road, Galway H91 TK33, Ireland
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6
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Zhong W, Hooley RJ. Combining Excellent Selectivity with Broad Target Scope: Biosensing with Arrayed Deep Cavitand Hosts. Acc Chem Res 2022; 55:1035-1046. [PMID: 35302733 DOI: 10.1021/acs.accounts.2c00026] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Simple macrocyclic water-soluble hosts such as cucurbiturils, cyclophanes, and calixarenes have long been used for biosensing via indicator displacement assays. Using multiple hosts and dyes in an arrayed format allows pattern recognition-based "chemical nose" sensing, which confers exquisite selectivity, even rivaling the abilities of biological recognition tools such as antibodies. However, a challenge in indicator displacement-based biosensing with macrocyclic hosts is that selectivity and scope are often inversely correlated: strong selectivity for a specific target can limit wide application, and broad scope sensing can suffer from a lack of selectivity between similar targets. This problem can be addressed by using water-soluble, self-folding deep cavitands as hosts. These flexible bowl-shaped receptors can be easily functionalized with different motifs at the upper and lower rim, and the large cavities can bind many different fluorescent dyes, causing either fluorescence enhancement or quenching upon binding.Cavity-based affinity is strongest for NMe3+ groups such as trimethyl-lysine, and we have exploited this for the site-selective recognition of post-translational lysine methylations in oligopeptides. The host recognizes the NMe3+ group, and by applying differently functionalized hosts in an arrayed format, discrimination between identical modifications at different positions on the oligopeptide is possible. Multiple recognition elements can be exploited for selectivity, including a defined, yet "breathable" cavity, and variable upper rim functions oriented toward the target.While the performance of the host/guest sensing system is impressive for lysine methylations, the most important advance is the use of multiple different sensing mechanisms that can target a broad range of different biorelevant species. The amphiphilic deep cavitands can both bind fluorescent dyes and interact with charged biomolecules. These non-cavity-based interactions, when paired with additives such as heavy metal ions, modulate fluorescence response in an indirect manner, and these different mechanisms allow selective recognition of serine phosphorylation, lysine acetylation, and arginine citrullination. Other targets include heavy metals, drugs of abuse, and protein isoforms. Furthermore, the hosts can be applied in supramolecular tandem assays of enzyme function: the broad scope allows analysis of such different enzymes as chromatin writers/erasers, kinases, and phosphatases, all from a single host scaffold. Finally, the indirect sensing concept allows application in sensing different oligonucleotide secondary structures, including G-quadruplexes, hairpins, triplexes, and i-motifs. Discrimination between DNA strands with highly similar structures such as G-quadruplex strands with bulges and vacancies can be achieved. Instead of relying on a single highly specific fluorescent probe, the synthetic hosts tune the fluorophore-DNA interaction, introducing multiple recognition equilibria that modulate the fluorescence signal. By applying machine learning algorithms, a classification model can be established that can accurately predict the folding state of unknown sequences. Overall, the unique recognition profile of self-folded deep cavitands provides a powerful, yet simple sensing platform, one that can be easily tuned for a wide scope of biorelevant targets, in complex biological media, without sacrificing selectivity in the recognition.
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7
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Hickey BL, Chen J, Zou Y, Gill AD, Zhong W, Millar JG, Hooley RJ. Enantioselective sensing of insect pheromones in water. Chem Commun (Camb) 2021; 57:13341-13344. [PMID: 34817473 DOI: 10.1039/d1cc05540b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An arrayed combination of water-soluble deep cavitands and cationic dyes has been shown to optically sense insect pheromones at micromolar concentration in water. Machine learning approaches were used to optimize the most effective array components, which allows differentiation between small structural differences in targets, including between different diastereomers, even though the pheromones have no innate chromophore. When combined with chiral additives, enantiodiscrimination is possible, dependent on the size and shape of the pheromone.
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Affiliation(s)
- Briana L Hickey
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA.
| | - Junyi Chen
- Environmental Toxicology Graduate Program, University of California-Riverside, Riverside, CA 92521, USA
| | - Yunfan Zou
- Department of Entomology, University of California-Riverside, Riverside, CA 92521, USA
| | - Adam D Gill
- Department of Biochemistry, University of California-Riverside, Riverside, CA 92521, USA
| | - Wenwan Zhong
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA. .,Environmental Toxicology Graduate Program, University of California-Riverside, Riverside, CA 92521, USA
| | - Jocelyn G Millar
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA. .,Department of Entomology, University of California-Riverside, Riverside, CA 92521, USA
| | - Richard J Hooley
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA. .,Department of Biochemistry, University of California-Riverside, Riverside, CA 92521, USA
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Chen J, Gill AD, Hickey BL, Gao Z, Cui X, Hooley RJ, Zhong W. Machine Learning Aids Classification and Discrimination of Noncanonical DNA Folding Motifs by an Arrayed Host:Guest Sensing System. J Am Chem Soc 2021; 143:12791-12799. [PMID: 34346209 DOI: 10.1021/jacs.1c06031] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An arrayed host:guest fluorescence sensor system can discriminate among and classify multiple different noncanonical DNA structures by exploiting selective molecular recognition. The sensor is highly selective and can discriminate between folds as similar as native G-quadruplexes and those with bulges or vacancies. The host and guest can form heteroternary complexes with DNA strands, with the host acting as mediator between the DNA and dye, modulating the emission. By applying machine learning algorithms to the sensing data, prediction of the folding state of unknown DNA strands is possible with high fidelity.
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Gallo C, Thomas SS, Selinger AJ, Hof F, Bohne C. Mechanism of a Disassembly-Driven Sensing System Studied by Stopped-Flow Kinetics. J Org Chem 2021; 86:10782-10787. [PMID: 34260247 DOI: 10.1021/acs.joc.1c00959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We carried out steady-state and stopped-flow photophysical measurements to determine the kinetics of a discrete disassembly driven turn-on fluorescent system. On and off rates for both DimerDye1 assembly and nicotine binding were determined. Relative rates for these competing processes provide insight on how this system can be optimized for sensing applications. Kinetics studies in artificial saliva showed that moving to more complex media has minimal effects on the sensing ability of the system.
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Affiliation(s)
- Cara Gallo
- Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Suma S Thomas
- Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Allison J Selinger
- Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Fraser Hof
- Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
| | - Cornelia Bohne
- Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
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Szyszka Ł, Górecki M, Cmoch P, Jarosz S. Fluorescent Molecular Cages with Sucrose and Cyclotriveratrylene Units for the Selective Recognition of Choline and Acetylcholine. J Org Chem 2021; 86:5129-5141. [PMID: 33710904 PMCID: PMC8041319 DOI: 10.1021/acs.joc.1c00019] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The synthesis of
four fluorescent diastereoisomeric molecular cages
containing cyclotriveratrylene and sucrose moieties connected via the naphthalene linkers is reported. These diastereoisomers
were found to be selective and efficient receptors for acetylcholine
and choline. Compound P-5a has a better
affinity for choline over acetylcholine, while cage M-5a exhibits a higher association constant for acetylcholine
over choline. The highest selectivity value was observed for compound M-5a (KACh/KCh = 3.1). Cages P-5a, P-5b, M-5a, and M-5b were fully characterized
by the advanced NMR techniques, and ECD spectroscopy was supported
by DFT calculations. The binding constants Ka of these receptors were determined by fluorescence titration
experiments in acetonitrile.
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Affiliation(s)
- Łukasz Szyszka
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
| | - Marcin Górecki
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
| | - Piotr Cmoch
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
| | - Sławomir Jarosz
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
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11
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12
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Long A, Antonetti E, Insuasty A, Pinet S, Gosse I, Robert V, Dutasta JP, Martinez A. Hemicryptophanes with Improved Fluorescent Properties for the Selective Recognition of Acetylcholine over Choline. J Org Chem 2020; 85:6400-6407. [PMID: 32249580 DOI: 10.1021/acs.joc.0c00217] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of two new fluorescent hemicryptophanes is reported. They were found to be efficient and selective receptors for acetylcholine over choline. When compared to other hemicryptophane hosts previously reported for the selective recognition of acetylcholine, they display improved fluorescent properties: their maximum emission wavelengths are red-shifted and the quantum yields are higher. NMR titration experiments and density functional theory (DFT) calculations support the results obtained from fluorescence spectroscopy and give insights into the interactions involved in the host/guest complexes and into the selectivity for acetylcholine over choline.
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Affiliation(s)
- Augustin Long
- Aix-Marseille Univ., CNRS, Centrale Marseille, iSm2, UMR 7113, 13397 Marseille, France
| | - Elise Antonetti
- Aix-Marseille Univ., CNRS, Centrale Marseille, iSm2, UMR 7113, 13397 Marseille, France
| | - Alberto Insuasty
- Aix-Marseille Univ., CNRS, Centrale Marseille, iSm2, UMR 7113, 13397 Marseille, France
| | - Sandra Pinet
- ISM, UMR 5255 CNRS, Bordeaux INP and Univ. Bordeaux, 351 cours de la Libération, F-33400 Talence, France
| | - Isabelle Gosse
- ISM, UMR 5255 CNRS, Bordeaux INP and Univ. Bordeaux, 351 cours de la Libération, F-33400 Talence, France
| | - Vincent Robert
- Laboratoire de Chimie Quantique Institut de Chimie, UMR CNRS 7177, Université de Strasbourg, 4, rue Blaise Pascal, F-67070 Strasbourg, France
| | - Jean-Pierre Dutasta
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, UCBL, 46 allée d'Italie, F-69364 Lyon, France
| | - Alexandre Martinez
- Aix-Marseille Univ., CNRS, Centrale Marseille, iSm2, UMR 7113, 13397 Marseille, France
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13
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Gill AD, Hickey BL, Zhong W, Hooley RJ. Selective sensing of THC and related metabolites in biofluids by host:guest arrays. Chem Commun (Camb) 2020; 56:4352-4355. [DOI: 10.1039/d0cc01489c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A host–guest fluorescence sensor array can selectively detect THC and its metabolites in biofluids such as urine and saliva.
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Affiliation(s)
- Adam D. Gill
- Department of Biochemistry and Molecular Biology
- University of California-Riverside
- Riverside
- USA
| | - Briana L. Hickey
- Department of Chemistry
- University of California-Riverside
- Riverside
- USA
| | - Wenwan Zhong
- Department of Chemistry
- University of California-Riverside
- Riverside
- USA
- Environmental Toxicology Program
| | - Richard J. Hooley
- Department of Biochemistry and Molecular Biology
- University of California-Riverside
- Riverside
- USA
- Department of Chemistry
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14
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Yin XM, Gao LL, Li P, Bu R, Sun WJ, Gao EQ. Fluorescence Turn-On Response Amplified by Space Confinement in Metal-Organic Frameworks. ACS APPLIED MATERIALS & INTERFACES 2019; 11:47112-47120. [PMID: 31738506 DOI: 10.1021/acsami.9b18307] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sensitive fluorescence turn-on response to specific substances is highly desired for development of chemical sensors and switches. Here we utilized a "two-in-one" strategy to prepare ionic metal-organic frameworks (MOFs) functionalized with the cationic bipyridinium receptors at the frameworks and anionic fluorescent indicators in the pores. The MOFs are rendered a fluorescence-resting state because the indicator's fluorescence is efficiently quenched by the ground-state charge-transfer (CT) complexation between the indicator and receptor. Addition of an alkylamine efficiently turns on the fluorescence because the indicator is displaced by the CT complexation between alkylamine with receptor. The turn-on response is highly specific to alkylamines. The MOFs can be used as recyclable sensors for selective and sensitive detection of alkylamines, with ultralow detection limits (0.5 nM). The fluorescence in solid state can be reversibly switched on and off with high contrast. The sensitive and high-contrast response can be attributed to the space confinement effects of the porous frameworks. The confined space can significantly enhance indicator-receptor and analyte-receptor interactions, and thereby both the quenching efficiency in the off state and the displacement efficiency in the on state are amplified.
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Affiliation(s)
- Xue-Mei Yin
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Lu-Lu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Peng Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Ran Bu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - Weng-Jie Sun
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| | - En-Qing Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
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15
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Gill AD, Hickey BL, Wang S, Xue M, Zhong W, Hooley RJ. Sensing of citrulline modifications in histone peptides by deep cavitand hosts. Chem Commun (Camb) 2019; 55:13259-13262. [PMID: 31621759 PMCID: PMC6872487 DOI: 10.1039/c9cc07002h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Arrayed cavitand:fluorophore sensor complexes can selectively sense small citrulline modifications at arginine residues on post-translationally modified peptides. The sensor can differentiate between different numbers of citrulline modifications, and a simple two-fluorophore, 6-component array can effect cross-reactive discrimination between single modifications in aqueous solution.
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Affiliation(s)
- Adam D Gill
- Department of Biochemistry and Molecular Biology, University of California-Riverside, Riverside, CA 92521, USA.
| | - Briana L Hickey
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA
| | - Siwen Wang
- Environmental Toxicology Program, University of California-Riverside, Riverside, CA 92521, USA
| | - Min Xue
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA and Environmental Toxicology Program, University of California-Riverside, Riverside, CA 92521, USA
| | - Wenwan Zhong
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA and Environmental Toxicology Program, University of California-Riverside, Riverside, CA 92521, USA
| | - Richard J Hooley
- Department of Chemistry, University of California-Riverside, Riverside, CA 92521, USA and Department of Biochemistry and Molecular Biology, University of California-Riverside, Riverside, CA 92521, USA.
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16
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Long A, Fantozzi N, Pinet S, Genin E, Pétuya R, Bégué D, Robert V, Dutasta JP, Gosse I, Martinez A. Selective recognition of acetylcholine over choline by a fluorescent cage. Org Biomol Chem 2019; 17:5253-5257. [PMID: 31106320 DOI: 10.1039/c9ob00931k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A fluorescent hemicryptophane has been synthesized and can be used as a turn on receptor of acetylcholine. A binding constant of 2.4 × 104 M-1 was measured for this neurotransmitter, and its selective and sensitive detection over choline and choline phosphate was achieved. NMR and DFT calculations provide insight into the interactions involved in this selective recognition process.
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Affiliation(s)
- Augustin Long
- Aix Marseille Université, Centrale Marseille, CNRS, ISM2 UMR 7313, 13397, Marseille, France.
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17
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Gill AD, Perez L, Salinas INQ, Byers SR, Liu Y, Hickey BL, Zhong W, Hooley RJ. Selective Array‐Based Sensing of Anabolic Steroids in Aqueous Solution by Host–Guest Reporter Complexes. Chemistry 2019; 25:1740-1745. [DOI: 10.1002/chem.201804854] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Indexed: 12/22/2022]
Affiliation(s)
- Adam D. Gill
- Department of Biochemistry and Molecular Biology University of California-Riverside Riverside CA 92521 USA
| | - Lizeth Perez
- Department of Chemistry University of California-Riverside Riverside CA 92521 USA
| | - Isaac N. Q. Salinas
- Department of Statistics University of California-Riverside Riverside CA 92521 USA
| | - Samantha R. Byers
- Department of Biochemistry and Molecular Biology University of California-Riverside Riverside CA 92521 USA
| | - Yang Liu
- Environmental Toxicology Program University of California-Riverside Riverside CA 92521 USA
| | - Briana L. Hickey
- Department of Chemistry University of California-Riverside Riverside CA 92521 USA
| | - Wenwan Zhong
- Department of Chemistry University of California-Riverside Riverside CA 92521 USA
- Environmental Toxicology Program University of California-Riverside Riverside CA 92521 USA
| | - Richard J. Hooley
- Department of Chemistry University of California-Riverside Riverside CA 92521 USA
- Department of Biochemistry and Molecular Biology University of California-Riverside Riverside CA 92521 USA
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18
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Fang X, Zheng Y, Duan Y, Liu Y, Zhong W. Recent Advances in Design of Fluorescence-Based Assays for High-Throughput Screening. Anal Chem 2019; 91:482-504. [PMID: 30481456 PMCID: PMC7262998 DOI: 10.1021/acs.analchem.8b05303] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Xiaoni Fang
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Yongzan Zheng
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Yaokai Duan
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Yang Liu
- Environmental Toxicology Graduate Program, University of California, Riverside, California 92521, United States
| | - Wenwan Zhong
- Department of Chemistry, University of California, Riverside, California 92521, United States
- Environmental Toxicology Graduate Program, University of California, Riverside, California 92521, United States
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19
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Liu Y, Gill AD, Duan Y, Perez L, Hooley RJ, Zhong W. A supramolecular sensor array for selective immunoglobulin deficiency analysis. Chem Commun (Camb) 2019; 55:11563-11566. [DOI: 10.1039/c9cc06064b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A host–guest based fluorescence sensor array can fully discriminate five structurally similar Ig protein isotypes, and recognize Ig deficiencies in serum.
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Affiliation(s)
- Yang Liu
- University of California – Riverside
- Environmental Toxicology Program
- Riverside
- USA
| | - Adam D. Gill
- University of California – Riverside
- Department of Biochemistry and Molecular Biology
- Riverside
- USA
| | - Yaokai Duan
- University of California – Riverside
- Department of Chemistry
- Riverside
- USA
| | - Lizeth Perez
- University of California – Riverside
- Department of Chemistry
- Riverside
- USA
| | - Richard J. Hooley
- University of California – Riverside
- Department of Biochemistry and Molecular Biology
- Riverside
- USA
- University of California – Riverside
| | - Wenwan Zhong
- University of California – Riverside
- Environmental Toxicology Program
- Riverside
- USA
- University of California – Riverside
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20
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Liu Y, Lee J, Perez L, Gill AD, Hooley RJ, Zhong W. Selective Sensing of Phosphorylated Peptides and Monitoring Kinase and Phosphatase Activity with a Supramolecular Tandem Assay. J Am Chem Soc 2018; 140:13869-13877. [PMID: 30269482 DOI: 10.1021/jacs.8b08693] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Simple tuning of a host:guest pair allows selective sensing of different peptide modifications, exploiting orthogonal recognition mechanisms. Excellent selectivity for either lysine trimethylations or alcohol phosphorylations is possible by simply varying the fluorophore guest. The phosphorylation sensor can be modulated by the presence of small (μM) concentrations of metal ions, allowing array-based sensing. Phosphorylation at serine, threonine, and tyrosine can be selectively sensed via discriminant analysis. The phosphopeptide sensing is effective in the presence of small-molecule phosphates such as ATP, which in turn enables the sensor to be employed in continuous optical assays of both serine kinase and tyrosine phosphatase activity. The activity of multiple different kinases can be monitored, and the sensor is capable of detecting the phosphorylation of peptides containing multiple different modifications, including lysine methylations and acetylation. A single deep cavitand can be used as a "one size fits all" sensor that can selectively detect multiple different modifications to oligopeptides, as well as monitoring the function of their post-translational modification writer and eraser enzymes in complex systems.
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21
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Perez L, Caulkins BG, Mettry M, Mueller LJ, Hooley RJ. Lipid bilayer environments control exchange kinetics of deep cavitand hosts and enhance disfavored guest conformations. Chem Sci 2018; 9:1836-1845. [PMID: 29675229 PMCID: PMC5890788 DOI: 10.1039/c7sc05155g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 01/11/2018] [Indexed: 12/31/2022] Open
Abstract
The effects on the molecular recognition properties of water-soluble deep cavitand hosts upon embedding them in phosphocholine lipid bilayer environments have been studied by 2D NMR experiments. By employing suitable guests containing 19F or 13C nuclei that can be encapsulated inside the host, 2D EXSY NMR experiments can be used to analyze and compare the in/out guest exchange rates in aqueous solution, isotropically tumbling micelles, or magnetically ordered bicelles. These analyses show that embedding the deep cavitands in lipid bilayers slows the guest exchange rate, due to the lipids acting as a "compression sleeve" around the host, restricting guest egress. This effect also enhances guest conformations in the host that are not observed in free solution, such as axial cyclohexane conformers and ketone hydrates.
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Affiliation(s)
- Lizeth Perez
- Department of Chemistry , University of California - Riverside , Riverside , CA 92521 , USA .
| | - Bethany G Caulkins
- Department of Chemistry , University of California - Riverside , Riverside , CA 92521 , USA .
| | - Magi Mettry
- Department of Chemistry , University of California - Riverside , Riverside , CA 92521 , USA .
| | - Leonard J Mueller
- Department of Chemistry , University of California - Riverside , Riverside , CA 92521 , USA .
| | - Richard J Hooley
- Department of Chemistry , University of California - Riverside , Riverside , CA 92521 , USA .
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22
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Lee J, Perez L, Liu Y, Wang H, Hooley RJ, Zhong W. Separation of Methylated Histone Peptides via Host-Assisted Capillary Electrophoresis. Anal Chem 2018; 90:1881-1888. [PMID: 29286640 DOI: 10.1021/acs.analchem.7b03969] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Lysine methylation in protein is one important epigenetic mechanism that regulates diverse biological processes but is challenging to study due to the large variability in methylation levels and sites. Here, we show that supramolecular hosts such as calixarenes and cucurbiturils can be applied in the background electrolyte (BGE) of capillary electrophoresis (CE) for highly effective separation of post-translationally methylated histone peptides. The molecular recognition event causes a shift in the electrophoretic mobility of the peptide, allowing affinity measurement for binding between the synthetic receptor and various methylated lysine species. Successful separation of the H3 peptides carrying different methylation levels at the K9 position can be achieved using CX4 and CX6 as the BGE additives in CE, enabling monitoring of the activity of the histone lysine demethylase JMJD2E. This reveals the power of combining high resolution CE with synthetic hosts for study of protein methylation, and the method should be capable of analyzing complex biological samples for better understanding of the functions of histone methylation.
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Affiliation(s)
| | | | | | - Hua Wang
- Instrument Analysis Center, Yancheng Teachers University , Yancheng, Jiangsu 224007, China
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23
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Liu Y, Duan Y, Gill AD, Perez L, Jiang Q, Hooley RJ, Zhong W. Metal-assisted selective recognition of biothiols by a synthetic receptor array. Chem Commun (Camb) 2018; 54:13147-13150. [DOI: 10.1039/c8cc07220e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A synergistic combination of a deep cavitand host, fluorophore guests and transition metal ions can be used to sense small molecule thiols of biological interest with good efficiency and selectivity in complex aqueous media.
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Affiliation(s)
- Yang Liu
- Department of Environmental Toxicology Program
- University of California-Riverside
- Riverside
- USA
| | - Yaokai Duan
- Department of Chemistry
- University of California-Riverside
- Riverside
- USA
| | - Adam D. Gill
- Department of Biochemistry and Molecular Biology
- University of California-Riverside
- Riverside
- USA
| | - Lizeth Perez
- Department of Chemistry
- University of California-Riverside
- Riverside
- USA
| | - Qiaoshi Jiang
- Department of Environmental Toxicology Program
- University of California-Riverside
- Riverside
- USA
| | - Richard J. Hooley
- Department of Chemistry
- University of California-Riverside
- Riverside
- USA
- Department of Biochemistry and Molecular Biology
| | - Wenwan Zhong
- Department of Environmental Toxicology Program
- University of California-Riverside
- Riverside
- USA
- Department of Chemistry
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24
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Liu Y, Mettry M, Gill AD, Perez L, Zhong W, Hooley RJ. Selective Heavy Element Sensing with a Simple Host-Guest Fluorescent Array. Anal Chem 2017; 89:11113-11121. [PMID: 28946741 DOI: 10.1021/acs.analchem.7b03377] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A simple three component array of host-fluorophore complexes is capable of sensitive and selective discrimination of heavy metal ions, including lanthanide and actinide salts in aqueous solution. Instead of applying optical sensors that only use "single-mode" detection, i.e., coordination of the metal to a specific ligand and monitoring the change in emission of an appended fluorophore, we exploit a series of host-fluorophore complexes that are affected by the presence of small amounts of metal ions in aqueous solution in different ways. Variable host-metal and host-guest-metal interactions lead to both turn-on and turn-off fluorescence sensing mechanisms, enhancing the discriminatory properties of the array. The limit of detection for certain metals is as low as 70 nM, and highly similar metals such as lanthanides and actinides can be easily distinguished at low micromolar concentrations in complex salt mixtures.
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Affiliation(s)
- Yang Liu
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Magi Mettry
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Adam D Gill
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Lizeth Perez
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Wenwan Zhong
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Richard J Hooley
- Department of Chemistry, ‡Environmental Toxicology Program, and §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
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25
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Liu Y, Perez L, Gill AD, Mettry M, Li L, Wang Y, Hooley RJ, Zhong W. Site-Selective Sensing of Histone Methylation Enzyme Activity via an Arrayed Supramolecular Tandem Assay. J Am Chem Soc 2017; 139:10964-10967. [PMID: 28777546 DOI: 10.1021/jacs.7b05002] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Arrayed deep cavitands can be coupled to a fluorescence-based supramolecular tandem assay that allows site-selective in situ monitoring of post-translational modifications catalyzed by the lysine methyltransferase PRDM9 or the lysine demethylase JMJD2E. An arrayed sensor system containing only three cavitand components can detect the specific substrates of enzyme modification, in the presence of other histone peptides in the enzyme assay, enabling investigation of cross-reactivity over multiple methylation sites and interference from nonsubstrate peptides.
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Affiliation(s)
- Yang Liu
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Lizeth Perez
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Adam D Gill
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Magi Mettry
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Lin Li
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Yinsheng Wang
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Richard J Hooley
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
| | - Wenwan Zhong
- Department of Chemistry, ‡Environmental Toxicology Program, §Department of Biochemistry and Molecular Biology, University of California-Riverside , Riverside, California 92521, United States
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26
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Perez L, Mettry M, Hinman SS, Byers SR, McKeating KS, Caulkins BG, Cheng Q, Hooley RJ. Selective protein recognition in supported lipid bilayer arrays by tailored, dual-mode deep cavitand hosts. SOFT MATTER 2017; 13:3966-3974. [PMID: 28512660 PMCID: PMC6041475 DOI: 10.1039/c7sm00192d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Self-folding deep cavitands with variably functionalized upper rims are able to selectively immobilize proteins at a biomimetic supported lipid bilayer surface. The immobilization process takes advantage of the dual-mode binding capabilities of the hosts, combining a defined binding pocket with upper rim charged/H-bonding groups. A variety of proteins can be selectively immobilized at the bilayer interface, either via complementary charge/H-bonding interactions, cavity-based molecular recognition, or a combination of both. The immobilization process can be used to bind unmodified native proteins, epitopes for bioadhesion, or proteins covalently modified with suitable RNMe3+ binding "handles" and charged groups that can either match or mismatch with the cavitand rim. The immobilization process can be monitored in real time using surface plasmon resonance (SPR) spectroscopy, and applied to the construction of cavitand:lipid arrays using the hosts and trehalose vitrified phospholipid vesicles. The selective, dual-mode protein recognition is maintained in the arrays, and can be visualized using SPR imaging.
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Affiliation(s)
- Lizeth Perez
- Department of Chemistry, University of California - Riverside, Riverside, CA 92521, USA.
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27
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Gober IN, Waters ML. Optimization of a synthetic receptor for dimethyllysine using a biphenyl-2,6-dicarboxylic acid scaffold: insights into selective recognition of hydrophilic guests in water. Org Biomol Chem 2017; 15:7789-7795. [DOI: 10.1039/c7ob01921a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Introduction of an endo-carboxylate in a building block for dynamic combinatorial chemistry resulted in amplification of a new host with a Kd of 200 nM for dimethyllysine, a biologically important post-translational modification.
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Affiliation(s)
- Isaiah N. Gober
- Department of Chemistry
- CB 3290
- University of North Carolina at Chapel Hill
- Chapel Hill
- USA
| | - Marcey L. Waters
- Department of Chemistry
- CB 3290
- University of North Carolina at Chapel Hill
- Chapel Hill
- USA
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