1
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Keever JM, Banzon PD, Hales MK, Sargent AL, Allen WE. Association between N-Terminal Pyrenes Stabilizes the Collagen Triple Helix. J Org Chem 2023; 88:11885-11894. [PMID: 37531574 DOI: 10.1021/acs.joc.3c01175] [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: 08/04/2023]
Abstract
Collagen model peptides featuring the fluorophore pyrene at their N-termini have been synthesized, and their thermal denaturation has been examined using circular dichroism (CD) and fluorescence spectroscopies. Flanking the (Pro-Hyp-Gly)7 core of the peptide monomers at positions 1 and/or 23 in the primary sequence, Lys residues were introduced to ensure water solubility. Triple helices derived from such peptides show a broad excimer emission at ∼480 nm, indicative of interaction between the pyrene units. CD experiments show that the fluorophores enhance helix stability primarily through entropic effects. Unfolding temperatures (Tm) increase by up to 7 °C for systems with N-terminal lysine residues and by up to 21 °C for systems in which the first-position Lys is replaced by Ala. Tm values derived from fluorescence measurements (at 50 μM) typically lie within ∼1 °C of those obtained using CD (at 200 μM). Computational modeling in a water continuum using B3LYP-GD3 and M06-2X functionals predicts that face-to-face association of fluorophores can occur while H-bonding within the [(POG)n]3 assembly is retained. Such parallel stacking is consistent with hydrophobically driven stabilization. Labeling collagen peptides with pyrene is a synthetically simple way to promote triple helicity while providing a means to obtain Tm data on relatively dilute samples.
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Affiliation(s)
- Jared M Keever
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Patrick D Banzon
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Megan K Hales
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Andrew L Sargent
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - William E Allen
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
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2
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Nakamura M, Yoshioka H, Takada T. Conformational Switching of Pyrenes Associated on Hairpin Loop Region by DNA B‐Z Transition. ChemistrySelect 2022. [DOI: 10.1002/slct.202200696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mitsunobu Nakamura
- Department of Applied Chemistry University of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
| | - Hibiki Yoshioka
- Department of Applied Chemistry University of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
| | - Tadao Takada
- Department of Applied Chemistry University of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
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3
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Jeevan AK, Gopidas KR. Self-Assembly and Photochemistry of a Pyrene-Methyl Viologen Supramolecular Fiber System. J Phys Chem B 2021; 125:8539-8549. [PMID: 34313435 DOI: 10.1021/acs.jpcb.1c04417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This paper reports the self-assembly of a donor-acceptor system into nanoscopic structures and the photo processes taking place within these structures. The donor employed is pyrene linked to two β-cyclodextrin molecules (CD-PY-CD), and adamantane-linked methyl viologen attached to the three arms of mesitylene (Ms-(MV2+-AD)3) is the acceptor. CD-PY-CD and Ms-(MV2+-AD)3 when dissolved in water self-assembled into vesicles, which joined together to give long fibers. The self-assembly was studied using spectroscopic and microscopic techniques. Fluorescence of the pyrene chromophore was quenched within the self-assembled system due to efficient photoinduced electron transfer to methyl viologen. Photoinduced electron transfer within the assembly is confirmed through identification of product radical ions in flash photolysis experiments. Steady-state irradiation of the self-assembled system in an optical bench led to the formation of methyl viologen radical cation, which was stable for a few hours. Longevity of the radical cation was attributed to the fast reaction of pyrene radical cation with adjacent pyrene to give an unstable adduct, which slows down the back electron transfer process.
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Affiliation(s)
- Athira K Jeevan
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 200 002, India
| | - Karical R Gopidas
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 200 002, India
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4
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Jeevan AK, Gopidas KR. Photoinduced Electron Transfer in a Self-Assembled Bis(β-cyclodextrin)-Linked Pyrene/Bis(adamantane)-Linked Methyl Viologen Donor-Acceptor System in Aqueous Solution. J Phys Chem B 2021; 125:4428-4437. [PMID: 33887907 DOI: 10.1021/acs.jpcb.1c00581] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Pyrene linked to two β-CD (CD = cyclodextrin; PY = pyrene) molecules (CD-PY-CD) and methylviologen (MV2+) linked to two adamantane (AD) groups (AD-MV2+-AD) self-assembled in water to give toroidal nanostructures. Photoprocesses taking place in the femtosecond and nanosecond time ranges within the assembly are reported. Fluorescence of the pyrene chromophore was quenched in the toroid, suggesting very efficient electron transfer. Fast quenching of the pyrene fluorescence with a time constant of 6.85 ns was attributed to photoinduced electron transfer from pyrene to methyl viologen within the toroid assembly. Electron transfer leads to the formation of radical ion products, PY•+ and MV•+, which were identified in the nanosecond transient absorption spectra. Because of the close packing of chromophores, the radical ions undergo fast reactions with chromophores or similar ions in adjacent stacks to give dimeric products. Since the dimeric species are not very stable, the reactions are reversed at longer time scales to generate the radical ions, which then undergo back electron transfer and regenerate the starting materials.
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Affiliation(s)
- Athira K Jeevan
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 200 002, India
| | - Karical R Gopidas
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 200 002, India
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5
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Jeevan AK, Krishnan SB, Gopidas KR. Structural Deformation to
β
‐Cyclodextrin Due to Strong π‐Stacking in the Self‐Assembly of Inclusion Complex. ChemistrySelect 2020. [DOI: 10.1002/slct.202004488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Athira K. Jeevan
- Chemical Sciences and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad - 200 002 India
| | - Sumesh B. Krishnan
- Chemical Sciences and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad - 200 002 India
| | - Karical R. Gopidas
- Chemical Sciences and Technology Division CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad - 200 002 India
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6
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Silva MP, Saibert C, Bortolotto T, Bortoluzzi AJ, Schenk G, Peralta RA, Terenzi H, Neves A. Dinuclear copper(II) complexes with derivative triazine ligands as biomimetic models for catechol oxidases and nucleases. J Inorg Biochem 2020; 213:111249. [PMID: 33011624 DOI: 10.1016/j.jinorgbio.2020.111249] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 08/25/2020] [Accepted: 08/30/2020] [Indexed: 11/28/2022]
Abstract
The research reported herein focuses on the synthesis of two new Cu(II) complexes {[Cu2(2-X-4,6-bis(di-2-picolylamino)-1,3,5-triazine], with X = butane-1,4-diamine (2) or N-methylpyrenylbutane-1,4-diamine (3)}, the latter with a pyrene group as a possible DNA intercalating agent. The structure of complex (3) was determined by X-ray crystallography and shows the dinuclear {CuII(μ-OCH3)2CuII} unit in which the CuII···CuII distance of 3.040 Å is similar to that of 2.97 Å previously found for 1, which contains a {CuII(μ-OH)2CuII} structural unit. Complexes (2) and (3) were also characterized in spectroscopic and electrochemical studies, and catecholase-like activity were performed for both complexes. The kinetic parameters obtained for the oxidation of the model substrate 3,5-di-tert-butylcatechol revealed that the insertion of the spacer butane-1,4-diamine and the pyrene group strongly contributes to increasing the catalytic efficiency of these systems. In fact, Kass becomes significantly higher, indicating that these groups influence the interaction between the complex and the substrate. These complexes also show DNA cleavage under mild conditions with moderate reaction times. The rate of cleavage (kcat) indicated that the presence of butane-1,4-diamine and pyrene increased the activity of both complexes. The reaction mechanism seems to have oxidative and hydrolytic features and the effect of DNA groove binding compounds and circular dichroism indicate that all complexes interact with plasmid DNA through the minor groove. High-resolution DNA cleavage assays provide information on the interaction mechanism and for complex (2) a specificity for the unpaired hairpin region containing thymine bases was observed, in contrast to (3).
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Affiliation(s)
- Marcos P Silva
- Laboratório de Bioinorgânica e Cristalografia - LABINC, Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil
| | - Cristine Saibert
- Centro de Biologia Molecular Estrutural - CEBIME, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil
| | - Tiago Bortolotto
- Centro de Biologia Molecular Estrutural - CEBIME, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil
| | - Adailton J Bortoluzzi
- Laboratório de Bioinorgânica e Cristalografia - LABINC, Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil
| | - Gerhard Schenk
- School of Molecular and Microbial Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Rosely A Peralta
- Laboratório de Bioinorgânica e Cristalografia - LABINC, Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil.
| | - Hernán Terenzi
- Centro de Biologia Molecular Estrutural - CEBIME, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil.
| | - Ademir Neves
- Laboratório de Bioinorgânica e Cristalografia - LABINC, Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Santa Catarina, Brazil.
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7
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Unusual Fluorescence Behavior of Pyrene-Amine Containing Dendrimers. Molecules 2019; 24:molecules24224083. [PMID: 31726647 PMCID: PMC6891302 DOI: 10.3390/molecules24224083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 01/02/2023] Open
Abstract
A new class of pyrene-based dendrimers, characterized by the presence of a 1,4,7,10-Tetraazacyclododecane (cyclen) unit as the core, was studied by SSF (steady-state fluorescence) and SPC (single-photon counting fluorescence). The photophysical behavior of these dendrimers was studied in THF, DMF and DMSO solution. The typical signals for pyrene-labeled molecules were recorded in each solvent, showing the representative fluorescence spectra: the corresponding emissions of monomer and excimer of the pyrene chromophore are observed. Unexpectedly, the typical quenching of tertiary amine on the pyrene emission was not observed in these dendrimers. Quenching studies were performed by adding up to 3 equivalents of trifluoroacetic acid (TFA). To our knowledge, this is the first report of pyrene's unquenching behavior by a tertiary amine.
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8
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Nakamura M, Takada T, Yamana K. Controlling Pyrene Association in DNA Duplexes by B‐ to Z‐DNA Transitions. Chembiochem 2019; 20:2949-2954. [DOI: 10.1002/cbic.201900350] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Mitsunobu Nakamura
- Department of Applied ChemistryUniversity of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
| | - Tadao Takada
- Department of Applied ChemistryUniversity of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
| | - Kazushige Yamana
- Department of Applied ChemistryUniversity of Hyogo 2167 Shosha Himeji Hyogo 671–2280 Japan
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9
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Pramanik B, Ahmed S, Singha N, Das BK, Dowari P, Das D. Unorthodox Combination of Cation-π and Charge-Transfer Interactions within a Donor-Acceptor Pair. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:478-488. [PMID: 30561205 DOI: 10.1021/acs.langmuir.8b03820] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Cation-π and charge-transfer (CT) interactions are ubiquitous in nature and involved in several biological processes. Although the origin of both the interactions in isolated pairs has extensively been studied, CT interactions are more prominent in supramolecular chemistry. Involvement of cation-π interactions in the preparation of advanced functional soft materials is uncommon. Moreover, a combination of these two interactions within a pair of electron donor (D) and acceptor (A) is uncharted. Here, we present a rational design to incorporate a combination of these two interactions within a D-A pair. A pyrene-peptide conjugate exhibits a combination of cation-π and CT interactions with a cationic naphthalenediimide (NDI) molecule in water. Nuclear Overhauser effect spectroscopy NMR along with other techniques and density functional theory calculations reveal the involvement of these interactions. The π-planes of pyrene and NDI adopt an angle of 56° to satisfy both the interactions, whereas β-sheet formation by the peptide sequence facilitates self-assembly. Notably, the binary system forms a self-supporting hydrogel at a higher concentration. The hydrogel shows efficient self-healing and injectable property. The hydrogel retains its thixotropic nature even at an elevated temperature. Broadly, we demonstrate a pathway that should prove pertinent to various areas, ranging from understanding biological assembly to peptide-based functional soft materials.
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Affiliation(s)
- Bapan Pramanik
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
| | - Sahnawaz Ahmed
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
| | - Nilotpal Singha
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
| | - Basab Kanti Das
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
| | - Payel Dowari
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
| | - Debapratim Das
- Department of Chemistry , Indian Institute of Technology Guwahati , Assam 781039 , India
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10
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Ghosh M, Ta S, Lohar S, Das S, Brandão P, Felix V, Das D. Exploring aggregation-induced emission through tuning of ligand structure for picomolar detection of pyrene. J Mol Recognit 2018; 32:e2771. [PMID: 30515937 DOI: 10.1002/jmr.2771] [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: 08/22/2018] [Revised: 10/09/2018] [Accepted: 10/26/2018] [Indexed: 11/09/2022]
Abstract
Tuning of ligand structures through controlled variation of ring number in fused-ring aromatic moiety appended to antipyrine allows detection of 7.8 × 10-12 M pyrene via aggregation-induced emission (AIE) associated with 101-fold fluorescence enhancement. In one case, antipyrine unit is replaced by pyridine to derive bis-methylanthracenyl picolyl amine. The structures of four molecules have been confirmed by single crystal X-ray diffraction analysis. Among them, pyrene-antipyrine conjugate (L) undergoes pyrene triggered inhibition of photo-induced electron transfer (PET) leading to water-assisted AIE.
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Affiliation(s)
- Milan Ghosh
- Department of Chemistry, The University of Burdwan, Bardhaman, India
| | - Sabyasachi Ta
- Department of Chemistry, The University of Burdwan, Bardhaman, India
| | - Sisir Lohar
- Department of Chemistry, T. D. B. College, Raniganj, Bardhaman, India
| | - Sudipta Das
- Department of Chemistry, Raina Swami Bholananda Vidyayatan, Bardhaman, India
| | - Paula Brandão
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | - Vitor Felix
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | - Debasis Das
- Department of Chemistry, The University of Burdwan, Bardhaman, India
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11
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Preparation of photoluminescent grafted polymers, having a polyethylene matrix and pyrene units linked via oligo(ethylene glycol) spacers, using gamma radiation. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2018.08.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Danko M, Hrdlovič P, Brzezinski M, Duda A, Biela T. Real-time monitoring of stereocomplex formation of poly(l-lactide) and poly(d-lactide) decorated with a pyrene derivative as a fluorescence probe. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.09.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Thadke SA, Perera JDR, Hridya VM, Bhatt K, Shaikh AY, Hsieh WC, Chen M, Gayathri C, Gil RR, Rule GS, Mukherjee A, Thornton CA, Ly DH. Design of Bivalent Nucleic Acid Ligands for Recognition of RNA-Repeated Expansion Associated with Huntington's Disease. Biochemistry 2018; 57:2094-2108. [PMID: 29562132 PMCID: PMC6091552 DOI: 10.1021/acs.biochem.8b00062] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We report the development of a new class of nucleic acid ligands that is comprised of Janus bases and the MPγPNA backbone and is capable of binding rCAG repeats in a sequence-specific and selective manner via, inference, bivalent H-bonding interactions. Individually, the interactions between ligands and RNA are weak and transient. However, upon the installation of a C-terminal thioester and an N-terminal cystine and the reduction of disulfide bond, they undergo template-directed native chemical ligation to form concatenated oligomeric products that bind tightly to the RNA template. In the absence of an RNA target, they self-deactivate by undergoing an intramolecular reaction to form cyclic products, rendering them inactive for further binding. The work has implications for the design of ultrashort nucleic acid ligands for targeting rCAG-repeat expansion associated with Huntington's disease and a number of other related neuromuscular and neurodegenerative disorders.
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Affiliation(s)
- Shivaji A. Thadke
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Institute for Biomolecular Design and Discovery (IBD), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Center for Nucleic Acids Science and Technology (CNAST), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - J. Dinithi R. Perera
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Institute for Biomolecular Design and Discovery (IBD), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Center for Nucleic Acids Science and Technology (CNAST), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - V. M. Hridya
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
| | - Kirti Bhatt
- Department of Neurology, Box 645, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Ashif Y. Shaikh
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Institute for Biomolecular Design and Discovery (IBD), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Center for Nucleic Acids Science and Technology (CNAST), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Wei-Che Hsieh
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Institute for Biomolecular Design and Discovery (IBD), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Center for Nucleic Acids Science and Technology (CNAST), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Mengshen Chen
- Department of Biological Sciences, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Chakicherla Gayathri
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Roberto R. Gil
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Gordon S. Rule
- Department of Biological Sciences, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Arnab Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
| | - Charles A. Thornton
- Department of Neurology, Box 645, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Danith H. Ly
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Institute for Biomolecular Design and Discovery (IBD), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
- Center for Nucleic Acids Science and Technology (CNAST), Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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14
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Hsieh WC, Bahal R, Thadke SA, Bhatt K, Sobczak K, Thornton C, Ly DH. Design of a "Mini" Nucleic Acid Probe for Cooperative Binding of an RNA-Repeated Transcript Associated with Myotonic Dystrophy Type 1. Biochemistry 2018; 57:907-911. [PMID: 29334465 DOI: 10.1021/acs.biochem.7b01239] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Toxic RNAs containing expanded trinucleotide repeats are the cause of many neuromuscular disorders, one being myotonic dystrophy type 1 (DM1). DM1 is triggered by CTG-repeat expansion in the 3'-untranslated region of the DMPK gene, resulting in a toxic gain of RNA function through sequestration of MBNL1 protein, among others. Herein, we report the development of a relatively short miniPEG-γ peptide nucleic acid probe, two triplet repeats in length, containing terminal pyrene moieties, that is capable of binding rCUG repeats in a sequence-specific and selective manner. The newly designed probe can discriminate the pathogenic rCUGexp from the wild-type transcript and disrupt the rCUGexp-MBNL1 complex. The work provides a proof of concept for the development of relatively short nucleic acid probes for targeting RNA-repeat expansions associated with DM1 and other related neuromuscular disorders.
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Affiliation(s)
- Wei-Che Hsieh
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Raman Bahal
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Shivaji A Thadke
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Kirti Bhatt
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Krzysztof Sobczak
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Charles Thornton
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
| | - Danith H Ly
- Department of Chemistry, ‡Institute for Biomolecular Design and Discovery (IBD), and §CNAST, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.,Department of Neurology, Box 645, University of Rochester Medical Center , 601 Elmwood Avenue, Rochester, New York 14642, United States
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15
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Spectroscopic measurements of interactions between hydrophobic 1-pyrenebutyric acid and silver colloidal nanoparticles. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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16
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El Idrissi M, Teat SJ, Corvini PFX, Paterson MJ, Dalgarno SJ, Shahgaldian P. Template-free hierarchical self-assembly of a pyrene derivative into supramolecular nanorods. Chem Commun (Camb) 2017; 53:1973-1976. [DOI: 10.1039/c6cc09731f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A pyrene derivative was designed to form, through a hierarchical process, well-defined supramolecular nanorods.
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Affiliation(s)
- Mohamed El Idrissi
- School of Life Sciences
- University of Applied Sciences and Arts Northwestern Switzerland
- Muttenz CH-4132
- Switzerland
| | - Simon J. Teat
- Advanced Light Source
- Lawrence Berkeley National Laboratory Berkeley
- USA
| | - Philippe F.-X. Corvini
- School of Life Sciences
- University of Applied Sciences and Arts Northwestern Switzerland
- Muttenz CH-4132
- Switzerland
| | | | | | - Patrick Shahgaldian
- School of Life Sciences
- University of Applied Sciences and Arts Northwestern Switzerland
- Muttenz CH-4132
- Switzerland
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17
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Ghosh A, Sengupta A, Chattopadhyay A, Das D. Lysine triggered ratiometric conversion of dynamic to static excimer of a pyrene derivative: aggregation-induced emission, nanomolar detection and human breast cancer cell (MCF7) imaging. Chem Commun (Camb) 2015; 51:11455-8. [DOI: 10.1039/c5cc02389k] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dynamic to static excimer formation followed by lysine concentration dependent spectral shift of a single crystal X-ray structurally characterized pyrene based probe allows highly selective ratiometric detection of lysine at the nanomolar level.
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Affiliation(s)
- Abhijit Ghosh
- Department of Chemistry
- The University of Burdwan
- Burdwan
- India
| | - Archya Sengupta
- Department of Zoology
- Visva Bharati University
- Santiniketan
- India
| | | | - Debasis Das
- Department of Chemistry
- The University of Burdwan
- Burdwan
- India
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18
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Abstract
Pyrene serves as a recognition motif to template the synthesis of mechanically interlocked derivatives of SWNTs.
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Affiliation(s)
| | - Emilio M. Pérez
- IMDEA Nanociencia
- Ciudad Universitaria de Cantoblanco
- Madrid
- Spain
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19
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Lignell A, Gudipati MS. Mixing of the Immiscible: Hydrocarbons in Water-Ice near the Ice Crystallization Temperature. J Phys Chem A 2014; 119:2607-13. [DOI: 10.1021/jp509513s] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Antti Lignell
- Ice Spectroscopy Lab, Science
Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Murthy S. Gudipati
- Ice Spectroscopy Lab, Science
Division, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
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20
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Affiliation(s)
- Heng Hu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | - Guojun Liu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
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21
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Kaushlendra K, Asha SK. Variable-Temperature Time-Resolved Emission Spectra Studies of Random Pyrene Urethane Methacrylate Copolymers with High Pyrene Incorporation. J Phys Chem B 2013; 117:11863-76. [DOI: 10.1021/jp406885f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- K. Kaushlendra
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
| | - S. K. Asha
- Polymer Science & Engineering Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
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22
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Fowler M, Siddique B, Duhamel J. Effect of sequence on the ionization behavior of a series of amphiphilic polypeptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4451-4459. [PMID: 23484851 DOI: 10.1021/la400030j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The behavior of five polypeptides made of hydrophilic and pH-responsive aspartic acid (Asp) and hydrophobic phenylalanine (Phe), which had been prepared by stitching together short well-defined sequences of Asp and Phe, was studied as a function of pH. The effect of pH on these polypeptides referred to as (Asp3Phe1)n, (Asp2Phe1)n, (Asp1Phe1)n, (Asp1Phe2)n, and (Asp1Phe3)n varied dramatically depending on their constituting sequence. The more hydrophobic polypeptides (Asp1Phe2)n and (Asp1Phe3)n behaved as if the Asp's were isolated from each other and showed an apparent pKa (pKa(app)) that remained constant with level of ionization (α = [Asp(-)]/[Asp]total) and equaled 5.4 and 6.4, respectively. The more hydrophilic polypeptides (Asp3Phe1)n and (Asp2Phe1)n behaved like weak polyacids showing a linear increase in pKa(app) with increasing α. The pKa(app) of (Asp1Phe1)n showed a trend as a function of α intermediate between the Asp-rich and Phe-rich polypeptides, behaving as if the Asp's were isolated at low α values (<0.35) but acting as a weak polyacid for large α values (>0.35). The effect that α, and thus the charge density of the polypeptides, had on the collapse and aggregation of the polypeptides was characterized by conducting static light scattering and fluorescence measurements. Static light scattering measurements demonstrated that all polypeptides precipitated and aggregated in solution at a critical charge density of 0.2. Fluorescence measurements with pyrene indicated that this behavior was due to the formation of Phe aggregates in water. Together, these experiments provide a complete description of how pH affects the behavior of a series of unique amphiphilic polypeptides designed with a well-defined sequence.
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Affiliation(s)
- Michael Fowler
- Institute of Polymer Research, Waterloo Institute of Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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23
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Chen S, Duhamel J. Probing the hydrophobic interactions of a series of pyrene end-labeled poly(ethylene oxide)s in aqueous solution using time-resolved fluorescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2821-2834. [PMID: 23305407 DOI: 10.1021/la304628d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The hydrophobic association of a series of poly(ethylene oxide)s covalently labeled at both ends with pyrene (PEO(X)-Py2 where X represents the number average molecular weight (Mn) of the PEO chains equal to 2, 5, 10, and 16.5 kDa) in aqueous solutions was investigated at different polymer concentrations (CP) using steady-state and time-resolved fluorescence measurements. Phase separation was observed with PEO(2 kDa)-Py2 and PEO(5 kDa)-Py2 samples at high CP. The steady-state fluorescence spectra showed that the ratios of excimer-to-monomer fluorescence intensities (IE/IM) of all PEO samples remained constant when CP was below 4 × 10(-5) M and decreased dramatically with increasing PEO chain length due to a decrease in intramolecular pyrene excimer formation. The IE/IM ratio in this regime was found to scale as Mn(-2.3±0.2). For CP > 4 × 10(-5) M, pyrene excimer is formed by both intra- and intermolecular interactions and the IE/IM ratio increases linearly with increasing CP except for PEO(2 kDa)-Py2 which undergoes phase separation. The decays obtained at various polymer concentrations were fitted according to a "sequential model" (SM) which assumes that the pyrene excimer is formed in a sequential manner. The molar fractions of all excited pyrene species and the rate constants for pyrene excimer formation were determined from the global analysis of the monomer and excimer fluorescence decays. The fraction of pyrenes that formed excimer from ground-state pyrene aggregates (fE0) was found to increase with CP in the regime where the pyrene excimer is formed both intra- and intermolecularly and decrease with Mn in the regime where the pyrene excimer is formed only intramolecularly. The fraction of pyrene pendants subject to hydrophobic interactions were used to determine the hydrophobic capture radius (Rc) of pyrene in water from the distribution of PEO end-to-end distances. Rc was found to equal 2.2 ± 0.2 nm using fE0.
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Affiliation(s)
- Shaohua Chen
- Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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24
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Xu XD, Zhang J, Yu X, Chen LJ, Wang DX, Yi T, Li F, Yang HB. Design and Preparation of Platinum-Acetylide Organogelators Containing Ethynyl-Pyrene Moieties as the Main Skeleton. Chemistry 2012; 18:16000-13. [DOI: 10.1002/chem.201202902] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Indexed: 12/23/2022]
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25
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Hashidzume A, Zheng Y, Harada A. Interaction of cyclodextrins with pyrene-modified polyacrylamide in a mixed solvent of water and dimethyl sulfoxide as studied by steady-state fluorescence. Beilstein J Org Chem 2012; 8:1312-7. [PMID: 23019465 PMCID: PMC3458755 DOI: 10.3762/bjoc.8.150] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 07/31/2012] [Indexed: 01/09/2023] Open
Abstract
The interaction of β- and γ-cyclodextrins (β-CD and γ-CD, respectively) with polyacrylamide modified with pyrenyl (Py) residues (pAAmPy) was investigated in a mixed solvent of water and dimethyl sulfoxide (DMSO) by steady-state fluorescence. In the absence of CD, the fluorescence spectra indicated that the formation of Py dimers became less favorable with increasing volume fraction of DMSO (x(DMSO)). The fluorescence spectra at varying x(DMSO) and CD concentrations indicated that β-CD and γ-CD included monomeric and dimeric Py residues, respectively. Using the fluorescence spectra, equilibrium constants of the formation of Py dimers and the complexation of β-CD and γ-CD with Py residues were roughly estimated based on simplified equilibrium schemes.
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Affiliation(s)
- Akihito Hashidzume
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
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26
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Gelover-Santiago A, Fowler MA, Yip J, Duhamel J, Burillo G, Rivera E. Unexpected absorbance enhancement upon clustering dyes in a polymer matrix. J Phys Chem B 2012; 116:6203-14. [PMID: 22594837 DOI: 10.1021/jp208646b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PE films grafted with poly(methyl acrylate) and labeled with pyrene groups were obtained by irradiation with γ-rays in the presence of acryloyl chloride and further reacting them with 1-pyrenebutanol or 1-pyrenemethylamine. Characterization of the polymer films benefited from the dual use of the pyrene probe as an indicator of, first, polymer chain dynamics by monitoring pyrene excimer formation by fluorescence and, second, polymer morphology by staining the pyrene-rich domains of the films with RuO(4) for scanning electron microscopy (SEM). The grafted polymers labeled with 1-pyrenemethylamine showed much stronger absorbance than those labeled with 1-pyrenebutanol despite having similar pyrene contents. The fluorescence spectra of the grafted polymers labeled with 1-pyrenebutanol exhibited monomer emission, whereas those labeled with 1-pyrenemethylamine exhibited exclusively excimer emission. These dramatic differences could be accounted for by noting that labeling of the grafted poly(acryloyl chloride) with 1-pyrenemethylamine results in cross-linking of the polymer matrix, with an associated enhancement of the concentration of pyrene in the cross-linked domains, which was confirmed by SEM. Formation of discrete domains in the polymer film can induce multiple scattering at the domain boundaries which lengthens the path of light in the film and increases absorption of the light by the tightly packed pyrene-rich domains. Implementation of this effect for fabrication of plastic color filters should generate more efficient filters which should find numerous practical applications.
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Affiliation(s)
- Adriana Gelover-Santiago
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, México
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27
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Duhamel J. New insights in the study of pyrene excimer fluorescence to characterize macromolecules and their supramolecular assemblies in solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6527-6538. [PMID: 22423596 DOI: 10.1021/la2047646] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This report highlights some of the recent developments that have been made in the quantitative analysis of fluorescence decays acquired with pyrene-labeled macromolecules. With these new analytical tools, macromolecules of different composition and architecture can now be labeled in a variety of ways with the pyrene chromophore, and the kinetics of pyrene excimer formation can be described to retrieve quantitative information about the internal dynamics of the macromolecules studied. In particular, this review presents the procedure that was followed to develop these new analytical tools and how the process of pyrene excimer formation with vinyl polymers, poly(L-glutamic acid), dendrimers, associative polymers, surfactants, and lipids labeled with pyrene has been successfully characterized thanks to these analysis programs.
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Affiliation(s)
- Jean Duhamel
- Institute of Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo , Waterloo ON N2L 3G1, Canada
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28
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Siu H, Duhamel J. Molar Absorbance Coefficient of Pyrene Aggregates in Water Generated by a Poly(ethylene oxide) Capped at a Single End with Pyrene. J Phys Chem B 2012; 116:1226-33. [DOI: 10.1021/jp208168r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Howard Siu
- Institute of Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Jean Duhamel
- Institute of Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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29
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Nakamura M, Fukuda M, Takada T, Yamana K. Highly ordered pyrene π-stacks on an RNA duplex display static excimer fluorescence. Org Biomol Chem 2012; 10:9620-6. [DOI: 10.1039/c2ob26773j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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30
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Chen S, Duhamel J, Bahun GJ, Adronov A. Quantifying the Presence of Unwanted Fluorescent Species in the Study of Pyrene-Labeled Macromolecules. J Phys Chem B 2011; 115:9921-9. [DOI: 10.1021/jp203124a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Shaohua Chen
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Greg J. Bahun
- Department of Chemistry and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, Canada
| | - Alex Adronov
- Department of Chemistry and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, Canada
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31
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Yip J, Duhamel J, Qiu XP, Winnik FM. Fluorescence studies of a series of monodisperse telechelic α,ω-dipyrenyl poly(N-isopropylacrylamide)s in ethanol and in water. CAN J CHEM 2011. [DOI: 10.1139/v10-117] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Steady-state and time-resolved fluorescence measurements were performed on solutions in ethanol and in water (23 °C) of a series of poly(N-isopropylacrylamide)s labeled with a pyrenyl group at each chain end (Py2-PNIPAM) and ranging in molecular weight (Mn) from 5 900 to 44 500 g·mol−1. Water and ethanol are of similar solvent quality towards the PNIPAM chain. The pyrene labels, in contrast, are soluble in ethanol but not in water. The efficiency of excimer formation for Py2-PNIPAM samples in ethanol decreased with increasing chain length, a trend typical of pyrene end-labeled polymers in good solvents. The ratio IE/IM, where IE is the Py excimer emission intensity and IM is the Py monomer emission intensity, scaled as Mn−1.4, where Mn is the number-average molecular weight of the sample. The kinetics of excimer formation were more complex for aqueous Py2-PNIPAM solutions, as a consequence of pyrene–pyrene association prior to excitation. The excimer time-dependent profiles exhibited significantly faster rise times, compared with the situation in ethanol, and they could not be fitted with the traditional Birks scheme. The results are discussed in the context of the solution properties of telechelic amphiphilic PNIPAMs and are compared with data gathered previously in studies of dipyrenyl end-labeled poly(ethylene oxides), the only other polymers soluble in water and organic solvents subjected to similar studies in the past.
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Affiliation(s)
- Jamie Yip
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- Faculty of Pharmacy and Department of Chemistry, Université de Montréal, CP 6128 Succursale Centre Ville, Montréal, QC H3C 3J7, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- Faculty of Pharmacy and Department of Chemistry, Université de Montréal, CP 6128 Succursale Centre Ville, Montréal, QC H3C 3J7, Canada
| | - Xing Ping Qiu
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- Faculty of Pharmacy and Department of Chemistry, Université de Montréal, CP 6128 Succursale Centre Ville, Montréal, QC H3C 3J7, Canada
| | - Françoise M. Winnik
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
- Faculty of Pharmacy and Department of Chemistry, Université de Montréal, CP 6128 Succursale Centre Ville, Montréal, QC H3C 3J7, Canada
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32
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Costa T, Sérgio Seixas de Melo J, Castro CS, Gago S, Pillinger M, Gonçalves IS. Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer. J Phys Chem B 2010; 114:12439-47. [DOI: 10.1021/jp1020214] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Telma Costa
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - J. Sérgio Seixas de Melo
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Catherine S. Castro
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Sandra Gago
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Martyn Pillinger
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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33
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Ingratta M, Mathew M, Duhamel J. How switching the substituent of a pyrene derivative from a methyl to a butyl affects the fluorescence response of polystyrene randomly labeled with pyrene. CAN J CHEM 2010. [DOI: 10.1139/v09-167] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of polystyrenes randomly labeled with 1-pyrenebutanol were prepared by copolymerizing styrene and 1-pyrenebutylacrylate yielding the CoBuE–PS series. Solutions of CoBuE–PS were prepared in nine organic solvents having viscosities ranging from 0.36 to 5.5 mPa·s and the fluorescence spectra and pyrene monomer and excimer fluorescence decays were acquired. Analysis of the fluorescence spectra yielded the IE/IM ratio, whereas analysis of the fluorescence decays with the fluorescence blob model (FBM) yielded the parameters N blobo , <kblob × Nblob> , and k blobo . These parameters were compared to those obtained with two other series of pyrene-labeled polystyrenes, which had been studied earlier, namely CoA–PS and CoE–PS where pyrene was attached to the polymer backbone via a methylamide and benzyl methylether linker, respectively. Although the parameters IE/IM, N blobo , <kblob × Nblob>, and k blobo took different values according to the specific nature of the linker connecting pyrene to the polystyrene backbone, they exhibited trends that were quite similar for all the pyrene-labeled polystyrene constructs. The excellent agreement between the parameters retrieved for the three different types of pyrene-labeled polystyrenes suggests that the FBM accounts satisfyingly for differences in the nature of the label used, while still retrieving information pertinent to the polymer of interest.
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Affiliation(s)
- Mark Ingratta
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
| | - Manoj Mathew
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
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34
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Matsuo Y, Nakajima K, Sugie Y. Covalent Attachment of Pyrene onto the Layer Surfaces of Silylated Magadiite at a High Concentration without Aggregation. CHEM LETT 2009. [DOI: 10.1246/cl.2009.1130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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