1
|
Lanza L, Rabe von Pappenheim F, Bjarnesen D, Leogrande C, Paul A, Krug L, Tittmann K, Müller M. Identification and Characterization of Thiamine Diphosphate-Dependent Lyases with an Unusual CDG Motif. Angew Chem Int Ed Engl 2024:e202404045. [PMID: 38874074 DOI: 10.1002/anie.202404045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 06/15/2024]
Abstract
The thiamine diphosphate (ThDP)-binding motif, characterized by the canonical GDG(X)24-27N sequence, is highly conserved among ThDP-dependent enzymes. We investigated a ThDP-dependent lyase (JanthE from Janthinobacterium sp. HH01) with an unusual cysteine (C458) replacing the first glycine of this motif. JanthE exhibits a high substrate promiscuity and accepts long aliphatic α-keto acids as donors. Sterically hindered aromatic aldehydes or non-activated ketones are acceptor substrates, giving access to a variety of secondary and tertiary alcohols as carboligation products. The crystal structure solved at a resolution of 1.9 Å reveals that C458 is not primarily involved in cofactor binding as previously thought for the canonical glycine. Instead, it coordinates methionine 406, thus ensuring the integrity of the active site and the enzyme activity. In addition, we have determined the long-sought genuine tetrahedral intermediates formed with pyruvate and 2-oxobutyrate in the pre-decarboxylation states and deciphered the atomic details for their stabilization in the active site. Collectively, we unravel an unexpected role for the first residue of the ThDP-binding motif and unlock a family of lyases that can perform valuable carboligation reactions.
Collapse
Affiliation(s)
- Lucrezia Lanza
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstrasse 25, 79104, Freiburg im Breisgau, Germany
| | - Fabian Rabe von Pappenheim
- Department of Molecular Enzymology, Georg-August Universität Göttingen, Max-Planck-Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Daniela Bjarnesen
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstrasse 25, 79104, Freiburg im Breisgau, Germany
| | - Camilla Leogrande
- Department of Molecular Enzymology, Georg-August Universität Göttingen, Max-Planck-Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Alexandra Paul
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstrasse 25, 79104, Freiburg im Breisgau, Germany
| | - Leonhard Krug
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstrasse 25, 79104, Freiburg im Breisgau, Germany
| | - Kai Tittmann
- Department of Molecular Enzymology, Georg-August Universität Göttingen, Max-Planck-Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Michael Müller
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstrasse 25, 79104, Freiburg im Breisgau, Germany
| |
Collapse
|
2
|
Oka M, Kozako R, Teranishi Y, Yamada Y, Miyake K, Fujimura T, Sasai R, Ikeue T, Iida H. Chiral Supramolecular Organogel Constructed Using Riboflavin and Melamine: Its Application in Photo-Catalyzed Colorimetric Chiral Sensing and Enantioselective Adsorption. Chemistry 2024; 30:e202303353. [PMID: 38012829 DOI: 10.1002/chem.202303353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/24/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
The synthesis of a chiral supramolecular organogel via the hierarchical helical self-assembly of optically active riboflavin and melamine derivatives is described herein. Owing to the photocatalysis of riboflavin and the supramolecular chirality induced in the helically stacked riboflavin/melamine complex, the gel is observed to act as a light-stimulated chiral sensor of optically active alcohols by detecting the change in color from yellow to green. The gel also served as an efficient chiral adsorbent, enabling optical resolution of a racemic compound with high chiral recognition ability.
Collapse
Affiliation(s)
- Marina Oka
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Ryo Kozako
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Yuta Teranishi
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Yuta Yamada
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Kazuhiro Miyake
- Center for Material Research Platform, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Takuya Fujimura
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Ryo Sasai
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Takahisa Ikeue
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Hiroki Iida
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| |
Collapse
|
3
|
Čubiňák M, Varma N, Oeser P, Pokluda A, Pavlovska T, Cibulka R, Sikorski M, Tobrman T. Tuning the Photophysical Properties of Flavins by Attaching an Aryl Moiety via Direct C-C Bond Coupling. J Org Chem 2023; 88:218-229. [PMID: 36525315 DOI: 10.1021/acs.joc.2c02168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Palladium-catalyzed Suzuki reactions of brominated flavin derivatives (5-deazaflavins, alloxazines, and isoalloxazines) with boronic acids or boronic acid esters that occur readily under mild conditions were shown to be an effective tool for the synthesis of a broad range of 7/8-arylflavins. In general, the introduction of an aryl/heteroaryl group by means of a direct C-C bond has been shown to be a promising approach to tuning the photophysical properties of flavin derivatives. The aryl substituents caused a bathochromic shift in the absorption spectra of up to 52 nm and prolonged the fluorescence lifetime by up to 1 order of magnitude. Moreover, arylation of flavin derivatives decreased their ability to generate singlet oxygen.
Collapse
Affiliation(s)
- Marek Čubiňák
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Naisargi Varma
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614Poznań, Poland
| | - Petr Oeser
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Adam Pokluda
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Tetiana Pavlovska
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Radek Cibulka
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Marek Sikorski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614Poznań, Poland
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| |
Collapse
|
4
|
Cariello M, Dietrich B, Thomson L, Gauci V, Boyer A, Sproules S, Cooke G, Seddon A, Adams DJ. A Self‐Assembling Flavin for Visible Photooxidation. Chemistry 2022; 28:e202201725. [PMID: 35722972 PMCID: PMC9541220 DOI: 10.1002/chem.202201725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Indexed: 11/06/2022]
Abstract
A new flavin‐based gelator is reported which forms micellar structures at high pH and gels at low pH. This flavin can be used for the photooxidation of thiols under visible light, with the catalytic efficiency being linked to the self‐assembled structures present.
Collapse
Affiliation(s)
| | - Bart Dietrich
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| | - Lisa Thomson
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| | - Valentina Gauci
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| | - Alistair Boyer
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| | | | - Graeme Cooke
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| | - Annela Seddon
- School of Physics, HH Wills Physics Laboratory University of Bristol Tyndall Avenue Bristol BS8 1TL UK
| | - Dave J. Adams
- School of Chemistry University of Glasgow Glasgow G12 8QQ UK
| |
Collapse
|
5
|
Zeng R, Lv C, Zang J, Zhang T, Zhao G. Designing Stacked Assembly of Type III Rubisco for CO 2 Fixation with Higher Efficiency. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:7049-7057. [PMID: 35670363 DOI: 10.1021/acs.jafc.2c02521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The slow catalytic rate of the carboxylation enzyme d-ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is a major barrier to increasing the rate of carbon assimilation from the atmosphere into the biosphere. It is of great importance to establish a method to improve the carboxylation efficiency of Rubisco. Inspired by the assembly of Rubisco in carboxysomes, herein, we presented a rational protein engineering approach for the construction of one-dimensional (1D) protein arrays of type III Rubisco through designed π-π stacking interactions by using crystal structural information as a guide. In aqueous solutions, the dimensions of these 1D protein arrays collectively span nearly the entire nano- and micrometer scale (200 nm to 5.0 μm) by adjusting protein and NaCl concentrations. As a result, the stacked Rubisco assemblies increase by 40% in the carboxylase activity, while their turnover number (kcat) is around twofold larger than that of wild-type III Rubisco. Notably, upon heat treatment at temperature up to 75 °C for 30 min, most of the assembled nanostructures and the enzyme activity are retained. More importantly, the initial relative activity of stacked assemblies retained 91% after 10 cycles of reuse. This work provides a simple, effective solution for the improvement of the CO2 carboxylation efficiency of Rubisco.
Collapse
Affiliation(s)
- Ruiqi Zeng
- College of Food Science & Nutritional Engineering, China Agricultural University, Key Laboratory of Functional Dairy, Ministry of Education, Beijing 100083, China
| | - Chenyan Lv
- College of Food Science & Nutritional Engineering, China Agricultural University, Key Laboratory of Functional Dairy, Ministry of Education, Beijing 100083, China
| | - Jiachen Zang
- College of Food Science & Nutritional Engineering, China Agricultural University, Key Laboratory of Functional Dairy, Ministry of Education, Beijing 100083, China
| | - Tuo Zhang
- College of Food Science & Nutritional Engineering, China Agricultural University, Key Laboratory of Functional Dairy, Ministry of Education, Beijing 100083, China
| | - Guanghua Zhao
- College of Food Science & Nutritional Engineering, China Agricultural University, Key Laboratory of Functional Dairy, Ministry of Education, Beijing 100083, China
| |
Collapse
|
6
|
Tunable Properties of Nature-Inspired N, N'-Alkylated Riboflavin Semiconductors. Molecules 2020; 26:molecules26010027. [PMID: 33374613 PMCID: PMC7793104 DOI: 10.3390/molecules26010027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/18/2020] [Accepted: 12/19/2020] [Indexed: 11/22/2022] Open
Abstract
A series of novel soluble nature-inspired flavin derivatives substituted with short butyl and bulky ethyl-adamantyl alkyl groups was prepared via simple and straightforward synthetic approach with moderate to good yields. The comprehensive characterization of the materials, to assess their application potential, has demonstrated that the modification of the conjugated flavin core enables delicate tuning of the absorption and emission properties, optical bandgap, frontier molecular orbital energies, melting points, and thermal stability. Moreover, the thin films prepared thereof exhibit smooth and homogeneous morphology with generally high stability over time.
Collapse
|
7
|
Curtolo F, Arantes GM. Mechanisms for Flavin-Mediated Oxidation: Hydride or Hydrogen-Atom Transfer? J Chem Inf Model 2020; 60:6282-6287. [DOI: 10.1021/acs.jcim.0c00945] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Felipe Curtolo
- Department of Biochemistry, Instituto de Quı́mica, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-900 São Paulo, SP, Brazil
| | - Guilherme M. Arantes
- Department of Biochemistry, Instituto de Quı́mica, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-900 São Paulo, SP, Brazil
| |
Collapse
|
8
|
Cariello M, Johnston B, Bhosale M, Amores M, Wilson E, McCarron LJ, Wilson C, Corr SA, Cooke G. Benzo-Dipteridine Derivatives as Organic Cathodes for Li- and Na-ion Batteries. ACS APPLIED ENERGY MATERIALS 2020; 3:8302-8308. [PMID: 33015587 PMCID: PMC7525807 DOI: 10.1021/acsaem.0c00829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 07/30/2020] [Indexed: 06/11/2023]
Abstract
Organic-based electrodes for Li- and Na-ion batteries present attractive alternatives to commonly applied inorganic counterparts which can often carry with them supply-chain risks, safety concerns with thermal runaway, and adverse environmental impact. The ability to chemically direct the structure of organic electrodes through control over functional groups is of particular importance, as this provides a route to fine-tune electrochemical performance parameters. Here, we report two benzo-dipteridine derivatives, BF-Me2 and BF-H2 , as high-capacity electrodes for use in Li- and Na-ion batteries. These moieties permit binding of multiple Li-ions per molecule while simultaneously ensuring low solubility in the supporting electrolyte, often a precluding issue with organic electrodes. Both display excellent electrochemical stability, with discharge capacities of 142 and 182 mAh g-1 after 100 cycles at a C/10 rate and Coulombic efficiencies of 96% and ∼ 100% demonstrated for BF-Me2 and BF-H2 , respectively. The application of a Na-ion cell has also been demonstrated, showing discharge capacities of 88.8 and 137 mAh g-1 after 100 cycles at a C/2 rate for BF-Me2 and BF-H2 , respectively. This work provides an encouraging precedent for these and related structures to provide versatile, high-energy density, and long cycle-life electrochemical energy storage materials.
Collapse
Affiliation(s)
- Michele Cariello
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Beth Johnston
- Department
of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - Manik Bhosale
- Department
of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - Marco Amores
- Department
of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - Emma Wilson
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Liam J. McCarron
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Claire Wilson
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Serena A. Corr
- Department
of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
- Department
of Materials Science and Engineering, University
of Sheffield, Sheffield S1 3JD, United Kingdom
| | - Graeme Cooke
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| |
Collapse
|
9
|
Chevalier Y, Lock Toy Ki Y, Herrero C, le Nouën D, Mahy JP, Goddard JP, Avenier F. Characterization in aqueous medium of an FMN semiquinone radical stabilized by the enzyme-like microenvironment of a modified polyethyleneimine. Org Biomol Chem 2020; 18:4386-4389. [PMID: 32469356 DOI: 10.1039/d0ob00864h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
The elusive flavin semiquinone intermediate found in flavoproteins such as cryptochromes has been obtained in aqueous solution by single electron reduction of the natural FMN cofactor using sodium ascorbate. This species was formed in the local hydrophobic microenvironment of a modified polyethyleneimine and characterized by UV-Visible, fluorescence and EPR spectroscopies.
Collapse
Affiliation(s)
- Yoan Chevalier
- ICMMO, UMR CNRS 8182, Université Paris Saclay, rue du doyen Georges Poitou, 91405 Orsay, France.
| | - Yvette Lock Toy Ki
- LIMA, UMR CNRS 7042, Université de Haute-Alsace, Université de Strasbourg, 68100 Mulhouse, France.
| | - Christian Herrero
- ICMMO, UMR CNRS 8182, Université Paris Saclay, rue du doyen Georges Poitou, 91405 Orsay, France.
| | - Didier le Nouën
- LIMA, UMR CNRS 7042, Université de Haute-Alsace, Université de Strasbourg, 68100 Mulhouse, France.
| | - Jean-Pierre Mahy
- ICMMO, UMR CNRS 8182, Université Paris Saclay, rue du doyen Georges Poitou, 91405 Orsay, France.
| | - Jean-Philippe Goddard
- LIMA, UMR CNRS 7042, Université de Haute-Alsace, Université de Strasbourg, 68100 Mulhouse, France.
| | - Frédéric Avenier
- ICMMO, UMR CNRS 8182, Université Paris Saclay, rue du doyen Georges Poitou, 91405 Orsay, France.
| |
Collapse
|
10
|
Dozova N, Lacombat F, Bou-Nader C, Hamdane D, Plaza P. Ultrafast photoinduced flavin dynamics in the unusual active site of the tRNA methyltransferase TrmFO. Phys Chem Chem Phys 2019; 21:8743-8756. [PMID: 30968076 DOI: 10.1039/c8cp06072j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Flavoproteins often stabilize their flavin coenzyme by stacking interactions involving the isoalloxazine moiety of the flavin and an aromatic residue from the apoprotein. The bacterial FAD and folate-dependent tRNA methyltransferase TrmFO has the unique property of stabilizing its FAD coenzyme by an unusual H-bond-assisted π-π stacking interaction, involving a conserved tyrosine (Y346 in Bacillus subtilis TrmFO, BsTrmFO), the isoalloxazine of FAD and the backbone of a catalytic cysteine (C53). Here, the interaction between FAD and Y346 has been investigated by measuring the photoinduced flavin dynamics of BsTrmFO in the wild-type (WT) protein, C53A and several Y346 mutants by ultrafast transient absorption spectroscopy. In C53A, the excited FAD very rapidly (0.43 ps) abstracts an electron from Y346, yielding the FAD˙-/Y346OH˙+ radical pair, while relaxation of the local environment (1.3 ps) of the excited flavin produces a slight Stokes shift of its stimulated emission band. The radical pair then decays via charge recombination, mostly in 3-4 ps, without any deprotonation of the Y346OH˙+ radical. Presumably, the H-bond between Y346 and the amide group of C53 increases the pKa of Y346OH˙+ and slows down its deprotonation. The dynamics of WT BsTrmFO shows additional slow decay components (43 and 700 ps), absent in the C53A mutant, assigned to excited FADox populations not undergoing fast photoreduction. Their presence is likely due to a more flexible structure of the WT protein, favored by the presence of C53. Interestingly, mutations of Y346 canceling its electron donating character lead to multiple slower quenching channels in the ps-ns regime. These channels are proposed to be due to electron abstraction either (i) from the adenine moiety of FAD, a distribution of the isoalloxazine-adenine distance in the absence of Y346 explaining the multiexponential decay, or (ii) from the W286 residue, possibly accounting for one of the decays. This work supports the idea that H-bond-assisted π-π stacking controls TrmFO's active site dynamics, required for competent orientation of the reactive centers during catalysis.
Collapse
Affiliation(s)
- Nadia Dozova
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
| | | | | | | | | |
Collapse
|
11
|
Nonomura K, Yuasa J. Competing Allosteric Mechanisms for Coordination-Directed Conformational Changes of Chiral Stacking Structures with Aromatic Rings. Inorg Chem 2019; 58:6474-6484. [PMID: 31008595 DOI: 10.1021/acs.inorgchem.9b00665] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This work revealed that significant asymmetric nonlinear effects can be found in a coordination-directed conformational alteration through competing allosteric mechanisms. Toward this aim, we have prepared new chiral bridging ligands [( S, S)- and ( R, R)-Im2An] containing an anthracene ring as a spacer with two ethynyl-linked chiral imidazole groups at the 9,10-positions. The ( S, S)- and ( R, R)-Im2An ligands (L) spontaneously form the assemblies with Zn2+ ions (M) in solution phase, giving L4M2-type assemblies with a general formula [( S, S)- or ( R, R)-Im2An]4(Zn2+)2. NMR studies revealed that the [( S, S)-Im2An]4(Zn2+)2 assembly has an anthracene dimer structure with a parallel-displaced geometry, leading to relatively small circular dichroism (CD) signals, as expected for nonchiral objects. Conversely, subsequent addition of chiral coligands [( R)- or ( S)-Ph-box] to [( S, S)-Im2An]4(Zn2+)2 afforded an alternative Zn2+ assembly with general formula [( R)- or ( S)-Ph-box]2[( S, S)-Im2An]2(Zn2+)2, where the chiral coligands expel two of the ( S, S)-Im2An ligands that were singly bound to the Zn2+ ions in the original [( S, S)-Im2An]4(Zn2+)2 assembly. This ligand-exchange reaction causes conformational alteration from a parallel-displaced structure to a twisted stacking between the anthracene rings inside the Zn2+ assembly, which results in a significant enhancement of CD signals due to excitonic interactions of the chiral anthracene dimer. Dissymmetry factor ( gCD) for CD due to chiral stacking structures shows a significant inverse sigmoidal response to the enantiomeric excess of the chiral coligands. The observed nonlinear phenomena are results of the two conflicting mechanisms, homochiral cooperative association (homochiral self-sorting) to form CD-active assemblies [( S)- or ( R)-Ph-box]2[( S, S)-Im2An]2(Zn2+)2 versus heterochiral cooperative dissociation of [( S, S)-Im2An]4(Zn2+)2 by sequestering of Zn2+ inside the assembly through formation of a heterochiral 2:1 Zn2+ complex ([( R)-Ph-box][( S)-Ph-box]Zn2+). The presented mechanisms provide a new strategy for generating switch-like OFF/ON states in chiral systems.
Collapse
Affiliation(s)
- Kohei Nonomura
- Department of Applied Chemistry , Tokyo University of Science , 1-3 Kagurazaka , Shinjuku-ku , Tokyo 162-8061 , Japan
| | - Junpei Yuasa
- Department of Applied Chemistry , Tokyo University of Science , 1-3 Kagurazaka , Shinjuku-ku , Tokyo 162-8061 , Japan
| |
Collapse
|
12
|
Bapli A, Gautam RK, Jana R, Seth D. Investigation of Different Prototropic Forms of Biologically Active Flavin Lumichrome in the Presence of Liposome. Photochem Photobiol 2019; 95:1151-1159. [PMID: 30932194 DOI: 10.1111/php.13105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/26/2019] [Indexed: 12/26/2022]
Abstract
Herein, we reported the photophysical behavior of lumichrome (LC), one of the biologically active flavin molecules, in the presence of small unilamellar vesicle of anionic lipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). With the help of different spectroscopic techniques, we have proposed that anionic DMPC liposome interacts with the cationic form LC in ground state and in excited state and modulate the spectral properties of LC. Photophysical study reveals that different prototropic forms of LC are present in DMPC liposome medium. In the presence of DMPC liposome, fluorescence emission properties of LC vary with change in excitation and emission wavelengths. This indicates switch over between different structural forms of LC. From fluorescence lifetime measurements and fluorescence lifetime imaging (FLIM) study, it was revealed that emission decay profile of LC was fitted biexponentially in the presence of liposome. It suggests that in the presence of liposome, more than one form of LC is present. We have constructed the time-resolved area-normalized emission spectra (TRANES) of LC in the liposome and found one isoemissive point. This confirmed that two emissive species of LC are present in liposome. FLIM study and FE-SEM study give an idea about the structural feature of the complex between LC and liposome.
Collapse
Affiliation(s)
- Aloke Bapli
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | | | - Rabindranath Jana
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| |
Collapse
|
13
|
Kumar S, Diwan A, Singh P, Gulati S, Choudhary D, Mongia A, Shukla S, Gupta A. Functionalized gold nanostructures: promising gene delivery vehicles in cancer treatment. RSC Adv 2019; 9:23894-23907. [PMID: 35530631 PMCID: PMC9069781 DOI: 10.1039/c9ra03608c] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 07/19/2019] [Indexed: 02/01/2023] Open
Abstract
Surface-modified gold nanoparticles are recognized as promising gene delivery vehicles in the treatment of cancer owing to their excellent biocompatibility with biomolecules (like DNA or RNA) and their unique optical and structural properties. In this context, this review article focuses on the diverse transfection abilities of the gene to the targeted cell on the basis of different shapes and sizes of gold nanoparticles in order to promote its effective expression for cancer treatment. In addition, recent trends in gold nanoparticle mediated gene silencing, gene delivery, detection and combinatory therapies are highlighted considering their cytotoxic effects on healthy human cells. Various functions of gold nanoparticles in conjugation with nucleic acids.![]()
Collapse
Affiliation(s)
- Sanjay Kumar
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Anchita Diwan
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Parinita Singh
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Shikha Gulati
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Devanshu Choudhary
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Ayush Mongia
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Shefali Shukla
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| | - Akanksha Gupta
- Department of Chemistry
- Sri Venkateswara College
- University of Delhi
- Delhi-110021
- India
| |
Collapse
|
14
|
Richtar J, Heinrichova P, Apaydin DH, Schmiedova V, Yumusak C, Kovalenko A, Weiter M, Sariciftci NS, Krajcovic J. Novel Riboflavin-Inspired Conjugated Bio-Organic Semiconductors. Molecules 2018; 23:E2271. [PMID: 30189689 PMCID: PMC6225382 DOI: 10.3390/molecules23092271] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 08/27/2018] [Accepted: 08/31/2018] [Indexed: 11/23/2022] Open
Abstract
Flavins are known to be extremely versatile, thus enabling routes to innumerable modifications in order to obtain desired properties. Thus, in the present paper, the group of bio-inspired conjugated materials based on the alloxazine core is synthetized using two efficient novel synthetic approaches providing relatively high reaction yields. The comprehensive characterization of the materials, in order to evaluate the properties and application potential, has shown that the modification of the initial alloxazine core with aromatic substituents allows fine tuning of the optical bandgap, position of electronic orbitals, absorption and emission properties. Interestingly, the compounds possess multichromophoric behavior, which is assumed to be the results of an intramolecular proton transfer.
Collapse
Affiliation(s)
- Jan Richtar
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| | - Patricie Heinrichova
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| | - Dogukan Hazar Apaydin
- Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria.
| | - Veronika Schmiedova
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| | - Cigdem Yumusak
- Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria.
| | - Alexander Kovalenko
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| | - Martin Weiter
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| | - Niyazi Serdar Sariciftci
- Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria.
| | - Jozef Krajcovic
- Faculty of Chemistry, Materials Research Centre, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic.
| |
Collapse
|
15
|
Krishnan Jagadamma L, McCarron LJ, Wiles AA, Savikhin V, Sajjad MT, Yazdani M, Rotello VM, Toney MF, Cooke G, Samuel IDW. Triptycene as a Supramolecular Additive in PTB7:PCBM Blends and Its Influence on Photovoltaic Properties. ACS APPLIED MATERIALS & INTERFACES 2018; 10:24665-24678. [PMID: 29932630 DOI: 10.1021/acsami.8b03114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Additives play an important role in modifying the morphology and phase separation of donor and acceptor molecules in bulk heterojunction (BHJ) solar cells. Here, we report triptycene (TPC) as a small-molecule additive for supramolecular control of phase separation and concomitant improvement of the power conversion efficiency (PCE) of PTB7 donor and fullerene acceptor-based BHJ polymer solar cells. An overall 60% improvement in PCE is observed for both PTB7:PC61BM and PTB7:PC71BM blends. The improved photovoltaic (PV) performance can be attributed to three factors: (a) TPC-induced supramolecular interactions with donor:acceptor components in the blends to realize a nanoscale phase-separated morphology; (b) an increase in the charge transfer state energy that lowers the driving force for electron transfer from donor to acceptor molecules; and (c) an increase in the charge carrier mobility. An improvement in efficiency using TPC as a supramolecular additive has also been demonstrated for other BHJ blends such as PBDB-T:PC71BM and P3HT:PCBM, implying the wide applicability of this new additive molecule. A comparison of the photostability of TPC as an additive for PTB7:PCBM solar cells to that of the widely used 1,8-diiodooctane additive shows ∼30% higher retention of PV performance for the TPC-added solar cells after 34 h of AM 1.5G illumination. The results obtained suggest that the approach of using additives that can promote supramolecular interactions to modify the length scale of phase separation between donor and acceptor is very promising and can lead to the development of highly efficient and stable organic photovoltaics.
Collapse
Affiliation(s)
- Lethy Krishnan Jagadamma
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy , University of St. Andrews , St. Andrews , Fife KY16 9SS , U.K
| | - Liam J McCarron
- Glasgow Centre for Physical Organic Chemistry (GCPOC), WestCHEM, School of Chemistry , University of Glasgow , Glasgow G12 8QQ , U.K.
| | - Alan A Wiles
- Glasgow Centre for Physical Organic Chemistry (GCPOC), WestCHEM, School of Chemistry , University of Glasgow , Glasgow G12 8QQ , U.K.
| | - Victoria Savikhin
- Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States
- Electrical Engineering Department , Stanford University , 350 Serra Mall , Stanford , California 94305 , United States
| | - Muhammad T Sajjad
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy , University of St. Andrews , St. Andrews , Fife KY16 9SS , U.K
| | - Mahdieh Yazdani
- Department of Chemistry , University of Massachusetts Amherst , 710 North Pleasant Street , Amherst , Massachusetts 01003 , United States
| | - Vincent M Rotello
- Department of Chemistry , University of Massachusetts Amherst , 710 North Pleasant Street , Amherst , Massachusetts 01003 , United States
| | - Michael F Toney
- Stanford Synchrotron Radiation Lightsource , SLAC National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States
| | - Graeme Cooke
- Glasgow Centre for Physical Organic Chemistry (GCPOC), WestCHEM, School of Chemistry , University of Glasgow , Glasgow G12 8QQ , U.K.
| | - Ifor D W Samuel
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy , University of St. Andrews , St. Andrews , Fife KY16 9SS , U.K
| |
Collapse
|
16
|
Sau A, Sanyal S, Bera K, Sen S, Mitra AK, Pal U, Chakraborty PK, Ganguly S, Satpati B, Das C, Basu S. DNA Damage and Apoptosis Induction in Cancer Cells by Chemically Engineered Thiolated Riboflavin Gold Nanoassembly. ACS APPLIED MATERIALS & INTERFACES 2018; 10:4582-4589. [PMID: 29338178 DOI: 10.1021/acsami.7b18837] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Herein we have engineered a smart nuclear targeting thiol-modified riboflavin-gold nano assembly, RfS@AuNPs, which accumulates selectively in the nucleus without any nuclear-targeting peptides (NLS/RGD) and shows photophysically in vitro DNA intercalation. A theoretical model using Molecular Dynamics has been developed to probe the mechanism of formation and stability as well as dynamics of the RfS@AuNPs in aqueous solution and within the DNA microenvironment. The RfS@AuNPs facilitate the binucleated cell formation that is reflected in the significant increase of DNA damage marker, γ-H2AX as well as the arrest of most of the HeLa cells at the pre-G1 phase indicating cell death. Moreover, a significant upregulation of apoptotic markers confirms that the cell death occurs through the apoptotic pathway. Analyses of the microarray gene expression of RfS@AuNPs treated HeLa cells show significant alterations in vital biological processes necessary for cell survival. Taken together, our study reports a unique nuclear targeting mechanism through targeting the riboflavin receptors, which are upregulated in cancer cells and induce apoptosis in the targeted cells.
Collapse
Affiliation(s)
| | | | | | | | - Amrit Krishna Mitra
- Department of Chemistry, Government General Degree College, Singur, Hooghly, West Bengal 712409, India
| | | | | | | | | | | | | |
Collapse
|
17
|
Chiral ethylene-bridged flavinium salts: the stereoselectivity of flavin-10a-hydroperoxide formation and the effect of substitution on the photochemical properties. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.10.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
18
|
Maung MS, Shon YS. Effects of Noncovalent Interactions on the Catalytic Activity of Unsupported Colloidal Palladium Nanoparticles Stabilized with Thiolate Ligands. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:20882-20891. [PMID: 29326755 PMCID: PMC5758047 DOI: 10.1021/acs.jpcc.7b07109] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This article presents the systematic evaluation of colloidal palladium nanoparticles functionalized with well-defined small organic ligands that provide spatial control of the geometric and electronic surface properties of nanoparticle catalysts. Palladium nanoparticles stabilized with thiolate ligands of different structures and functionalities (linear alkyl vs cyclohexyl vs phenyl) are synthesized using the thiosulfate protocol in a two-phase system. The structure and composition of palladium nanoparticles are characterized using transmission electron microscopy, thermogravimetric analysis, NMR, and UV-vis spectroscopies. The catalysis studies show that the chemical and structural compositions of monolayers surrounding the nanoparticle core greatly influence the overall activity and selectivity of colloidal palladium nanoparticle catalysts for the hydrogenation, isomerization, and hydrogenolysis of allylic alcohols. Especially, noncovalent interactions between surface phenyl ligands and incoming aromatic substrates are found to have a profound influence on the selectivity of colloidal palladium nanoparticles.
Collapse
Affiliation(s)
| | - Young-Seok Shon
- Corresponding Author: . Telephone: 562-985-4466. Fax: 562-985-8547
| |
Collapse
|
19
|
Mohammed N, Wiles AA, Belsley M, Fernandes SSM, Cariello M, Rotello VM, Raposo MMM, Cooke G. Synthesis and characterisation of push–pull flavin dyes with efficient second harmonic generation (SHG) properties. RSC Adv 2017. [DOI: 10.1039/c7ra03400h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report push–pull flavins bearing different donor groups that exhibit high hyperpolarisabilities (β = 355–9550 × 10−30 esu) and decomposition temperatures thereby indicating their potential application as non-linear optical device materials.
Collapse
Affiliation(s)
- Nabeel Mohammed
- Glasgow Centre for Physical Organic Chemistry
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | - Alan A. Wiles
- Glasgow Centre for Physical Organic Chemistry
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | | | | | - Michele Cariello
- Glasgow Centre for Physical Organic Chemistry
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | | | | | - Graeme Cooke
- Glasgow Centre for Physical Organic Chemistry
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| |
Collapse
|
20
|
Jeon HG, Jang HB, Kang P, Choi YR, Kim J, Lee JH, Choi MG, Jeong KS. Helical Aromatic Foldamers Functioning as a Fluorescence Turn-on Probe for Anions. Org Lett 2016; 18:4404-7. [DOI: 10.1021/acs.orglett.6b02156] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hae-Geun Jeon
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Han Bit Jang
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Philjae Kang
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Ye Rin Choi
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Junyoung Kim
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Ji Hyun Lee
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Moon-Gun Choi
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Kyu-Sung Jeong
- Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| |
Collapse
|
21
|
Rotello VM. Organic chemistry meets polymers, nanoscience, therapeutics and diagnostics. Beilstein J Org Chem 2016; 12:1638-46. [PMID: 27559417 PMCID: PMC4979691 DOI: 10.3762/bjoc.12.161] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 07/18/2016] [Indexed: 12/31/2022] Open
Abstract
The atom-by-atom control provided by synthetic organic chemistry presents a means of generating new functional nanomaterials with great precision. Bringing together these two very disparate skill sets is, however, quite uncommon. This autobiographical review provides some insight into how my program evolved, as well as giving some idea of where we are going.
Collapse
Affiliation(s)
- Vincent M Rotello
- Department of Chemistry, University of Massachusetts-Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, USA
| |
Collapse
|
22
|
Lucío MI, Pichler F, Ramírez JR, de la Hoz A, Sánchez-Migallón A, Hadad C, Quintana M, Giulani A, Bracamonte MV, Fierro JLG, Tavagnacco C, Herrero MA, Prato M, Vázquez E. Triazine-Carbon Nanotubes: New Platforms for the Design of Flavin Receptors. Chemistry 2016; 22:8879-88. [DOI: 10.1002/chem.201600630] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 11/05/2022]
Affiliation(s)
- María Isabel Lucío
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - Federica Pichler
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - José Ramón Ramírez
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
| | - Antonio de la Hoz
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
| | - Ana Sánchez-Migallón
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
| | - Caroline Hadad
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - Mildred Quintana
- Instituto de Física Universidad Autónoma de San Luis Potosí; Manuel Nava 6, Zona Universitaria 78290 San Luis Potosí, SLP Mexico
| | - Angela Giulani
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - Maria Victoria Bracamonte
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
- Instituto de Física Enrique Gaviola (CONICET) and FaMAF; Universidad Nacional de Córdoba Medina Allende s/n; X5000HUA Córdoba Argentina
| | - Jose L. G. Fierro
- Instituto de Catálisis y Petroleoquímica CSIC Cantoblanco; 28049 Madrid Spain
| | - Claudio Tavagnacco
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - María Antonia Herrero
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
| | - Maurizio Prato
- Dipartimento di Scienze Chimiche e Farmaceutiche Center of Excellence for Nanostructured Materials (CENMAT) & Italian Interuniversity Consortium on Materials Science and Technology (INSTM - Unit of Trieste); Università degli Studi di Trieste; Piazzale Europa 1 34127 Trieste Italy
| | - Ester Vázquez
- Departamento de Química Orgánica, Inorgánica y Bioquímica; Facultad de Ciencias y Tecnologías Químicas; IRICA Universidad de Castilla-La Mancha; Campus Universitario 13071 Ciudad Real Spain
| |
Collapse
|
23
|
Koo JY, Yakiyama Y, Lee GR, Lee J, Choi HC, Morita Y, Kawano M. Selective Formation of Conductive Network by Radical-Induced Oxidation. J Am Chem Soc 2016; 138:1776-9. [DOI: 10.1021/jacs.5b12355] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jin Young Koo
- The
Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| | - Yumi Yakiyama
- The
Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| | - Gil Ryeong Lee
- The
Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| | - Jinho Lee
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| | - Hee Cheul Choi
- Center
for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), 77 Cheongam-ro, Pohang 790-784, Korea
- Department
of Chemistry, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| | - Yasushi Morita
- Department
of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology, Yachigusa 1247, Yakusa, Toyota 470-0392, Japan
| | - Masaki Kawano
- The
Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Namgu, Pohang 790-784, Korea
| |
Collapse
|
24
|
Wiles AA, Fitzpatrick B, McDonald NA, Westwater MM, Long DL, Ebenhoch B, Rotello VM, Samuel IDW, Cooke G. Synthesis and properties of pteridine-2,4-dione-functionalised oligothiophenes. RSC Adv 2016. [DOI: 10.1039/c5ra22402k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The synthesis of symmetrical acceptor-functionalised oligothiophenes is described and their electrochemical and optical properties are reported.
Collapse
Affiliation(s)
- Alan A. Wiles
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| | - Brian Fitzpatrick
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| | - Niall A. McDonald
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| | - Mary Margaret Westwater
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| | - De-Liang Long
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| | - Bernd Ebenhoch
- Organic Semiconductor Centre
- SUPA
- School of Physics and Astronomy
- University of St Andrews
- Fife KY16 9SS
| | | | - Ifor D. W. Samuel
- Organic Semiconductor Centre
- SUPA
- School of Physics and Astronomy
- University of St Andrews
- Fife KY16 9SS
| | - Graeme Cooke
- Glasgow Centre for Physical Organic Chemistry (GCPOC)
- WestCHEM
- School of Chemistry
- University of Glasgow
- Glasgow
| |
Collapse
|
25
|
Farrán MÁ, Listorti A, Roiati V, Accorsi G, Gigli G, Clarkson GJ, Claramunt RM. Photoinduced processes in macrocyclic isoalloxazine–anthracene systems. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.08.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
26
|
Kubo T, Kuroda K, Naito T, Mukai SA, Sano T, Akiyoshi K, Otsuka K. Simple Preparation and Characterization of Viscoelastic Gels Induced by Multiple Intermolecular Interactions Using Low-Molecular-Weight Species. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20150209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takuya Kubo
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
| | - Kenta Kuroda
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
| | - Toyohiro Naito
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
| | - Sada-atsu Mukai
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
- The Exploratory Research for Advanced Technology (ERATO), Bio-nanotransporter Project, Japan Science and Technology Agency (JST), Katsura Int’tech Center
| | - Tomoharu Sano
- Center for Environmental Measurement and Analysis, National Institute for Environmental Studies
| | - Kazunari Akiyoshi
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
- The Exploratory Research for Advanced Technology (ERATO), Bio-nanotransporter Project, Japan Science and Technology Agency (JST), Katsura Int’tech Center
| | - Koji Otsuka
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
| |
Collapse
|
27
|
Tomanová P, Šturala J, Buděšínský M, Cibulka R. A Click Chemistry Approach towards Flavin-Cyclodextrin Conjugates-Bioinspired Sulfoxidation Catalysts. Molecules 2015; 20:19837-48. [PMID: 26556319 PMCID: PMC6331787 DOI: 10.3390/molecules201119667] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 10/13/2015] [Accepted: 10/14/2015] [Indexed: 11/16/2022] Open
Abstract
A click chemistry approach based on the reaction between alkynylflavins and mono(6-azido-6-deoxy)-β-cyclodextrin has proven to be a useful tool for the synthesis of flavin-cyclodextrin conjugates studied as monooxygenase mimics in enantioselective sulfoxidations.
Collapse
Affiliation(s)
- Petra Tomanová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Jiří Šturala
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic.
| | - Radek Cibulka
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| |
Collapse
|
28
|
Mataranga-Popa LN, Torje I, Ghosh T, Leitl MJ, Späth A, Novianti ML, Webster RD, König B. Synthesis and electronic properties of π-extended flavins. Org Biomol Chem 2015; 13:10198-204. [PMID: 26303394 DOI: 10.1039/c5ob01418b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Flavin derivatives with an extended π-conjugation were synthesized in moderate to good yields from aryl bromides via a Buchwald-Hartwig palladium catalyzed amination protocol, followed by condensation of the corresponding aromatic amines with violuric acid. The electronic properties of the new compounds were investigated by absorption and emission spectroscopy, cyclic voltammetry, density functional theory (DFT) and time dependent density functional theory (TDDFT). The compounds absorb up to 550 nm and show strong luminescence. The photoluminescence quantum yields ϕPL measured in dichloromethane reach 80% and in PMMA (poly(methyl methacrylate)) 77%, respectively, at ambient temperature. The electrochemical redox behaviour of π-extended flavins follows the mechanism previously described for the parent flavin.
Collapse
Affiliation(s)
- L N Mataranga-Popa
- University of Regensburg, Universitatsstraße 31, 93053 Regensburg, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Tan SLJ, Novianti ML, Webster RD. Effects of Low to Intermediate Water Concentrations on Proton-Coupled Electron Transfer (PCET) Reactions of Flavins in Aprotic Solvents and a Comparison with the PCET Reactions of Quinones. J Phys Chem B 2015; 119:14053-64. [PMID: 26447846 DOI: 10.1021/acs.jpcb.5b07534] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electrochemical reduction mechanisms of 2 synthesized flavins (Flox) were examined in detail in deoxygenated solutions of DMSO containing varying amounts of water, utilizing variable scan rate cyclic voltammetry (ν = 0.1-20 V s(-1)), controlled-potential bulk electrolysis, and UV-vis spectroscopy. Flavin 1, which contains a hydrogen atom at N(3), is capable of donating its proton to other reduced flavin species. After 1e(-) reduction, the initially formed Fl(•-) receives a proton from another Flox to form FlH(•) (and concomitantly produce the deprotonated flavin, Fl(-)), although the equilibrium constant for this process favors the back reaction. Any FlH(•) formed at the electrode surface immediately undergoes another 1e(-) reduction to form FlH(-), which reacts with Fl(-) to form 2 molecules of Fl(•-). Further 1e(-) reduction of Fl(•-) at more negative potentials produces the dianion, Fl(2-), which can also be protonated by another Flox to form FlH(-) and Fl(-). Flavin 2, which is methylated at N(3) (and therefore has no acidic proton), undergoes a simple chemically reversible 1e(-) reduction process in DMSO provided the water content is low (<100 mM). Further 1e(-) reduction of Fl(•-) (from flavin 2) at more negative potentials leads to the dianion, Fl(2-), which is protonated by trace water in solution to form FlH(-), similar to the mechanism of flavin 1 at high scan rates. Addition of sufficient amounts of water to nonaqueous solvents results in protonation of the anion radical species, Fl(•-), for both flavins, causing an increase in the amount of FlH(-) in solution. This behavior contrasts with what is observed for quinones, which are also reduced in two 1e(-) steps in aprotic organic solvents to form the radical anions and dianions, but are able to exist in hydrogen-bonded forms (with trace or added water) without undergoing protonation.
Collapse
Affiliation(s)
- Serena L J Tan
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore
| | - Maria L Novianti
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore
| | - Richard D Webster
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371, Singapore
| |
Collapse
|
30
|
|
31
|
Zhang KD, Sakai N, Matile S. Colorful surface architectures with three different types of dynamic covalent bonds: integration of anthocyanins, tritylium ions and flavins. Org Biomol Chem 2015; 13:8687-94. [PMID: 26179486 DOI: 10.1039/c5ob01167a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Although they combine the best of covalent and non-covalent bonds, dynamic covalent bonds are usually not used together. Building on pioneering examples for functional systems with two orthogonal dynamic covalent bonds, we herein elaborate on multicomponent surface architectures that operate with three different types of dynamic covalent bonds. Disulfide exchange under basic conditions is used to grow single π stacks directly on oxide surfaces, hydrazone exchange under acidic conditions to add a second string or stack, and boronic-ester exchange under neutral conditions to build the third one. In this study, we show that this synthetic approach to complex systems provides access to emergent properties, as exemplified with ordered stacks of anthocyanins, pyrocatchol violet and riboflavins. The integration of anthocyanins, the central component of the pigments of plant flowers, is interesting to protect the blue flavylium cation against deprotonation, deplanarization and degradation. The integration of pyrocatchol violet is of interest to stabilize the blue, disfavored tritylium cation. The red riboflavin stacks are attractive because they generate high photocurrent. These colorful examples hint at the potential of synthetic methods that use three different types of dynamic covalent bonds in concert to build complex systems with emergent properties.
Collapse
Affiliation(s)
- Kang-Da Zhang
- Department of Organic Chemistry, University of Geneva, Geneva, Switzerland.
| | | | | |
Collapse
|
32
|
Hamdane D, Bou-Nader C, Cornu D, Hui-Bon-Hoa G, Fontecave M. Flavin-Protein Complexes: Aromatic Stacking Assisted by a Hydrogen Bond. Biochemistry 2015; 54:4354-64. [PMID: 26120776 DOI: 10.1021/acs.biochem.5b00501] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Enzyme-catalyzed reactions often rely on a noncovalently bound cofactor whose reactivity is tuned by its immediate environment. Flavin cofactors, the most versatile catalyst encountered in biology, are often maintained within the protein throughout numbers of complex ionic and aromatic interactions. Here, we have investigated the role of π-π stacking and hydrogen bond interactions between a tyrosine and the isoalloxazine moiety of the flavin adenine dinucleotide (FAD) in an FAD-dependent RNA methyltransferase. Combining several static and time-resolved spectroscopies as well as biochemical approaches, we showed that aromatic stacking is assisted by a hydrogen bond between the phenol group and the amide of an adjacent active site loop. A mechanism of recognition and binding of the redox cofactor is proposed.
Collapse
Affiliation(s)
- Djemel Hamdane
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Charles Bou-Nader
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - David Cornu
- ‡INSERM U779, 78 Rue du Général Leclerc, 94275 Le Kremlin-Bicêtre, France
| | - Gaston Hui-Bon-Hoa
- §Plateforme IMAGIF, Centre de Recherche de Gif, Centre National de la Recherche Scientifique, 1 avenue de le terrasse, 91191 Gif Sur Yvette, France
| | - Marc Fontecave
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| |
Collapse
|
33
|
Maity B, Chatterjee A, Seth D. Photophysics of lumichrome in anionic and cationic micellar media. RSC Adv 2015. [DOI: 10.1039/c4ra14998j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The photophysics of lumichrome in the presence of cationic and anionic micellar environments was reported in this article.
Collapse
Affiliation(s)
- Banibrata Maity
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | - Aninda Chatterjee
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | - Debabrata Seth
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| |
Collapse
|
34
|
Bresnahan CG, Reinhardt CR, Bartholow TG, Rumpel JP, North M, Bhattacharyya S. Effect of stacking interactions on the thermodynamics and kinetics of lumiflavin: a study with improved density functionals and density functional tight-binding protocol. J Phys Chem A 2014; 119:172-82. [PMID: 25490119 DOI: 10.1021/jp510020v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The π-π stacking interaction between lumiflavin and a number of π-electron-rich molecules has been studied by density functional theory using several new-generation density functionals. Six known lumiflavin-aromatic adducts were used and the models were evaluated by comparing the geometry and energetics with experimental results. The study found that dispersion-corrected and hybrid functionals with larger (>50%) Hartree-Fock exchanges produced superior results in modeling thermodynamic characteristics of these complexes. The functional producing the best energetics for these model systems was used to study the stacking interactions of lumiflavin with biologically relevant aromatic groups. Additionally, the reduction of flavin-in the presence of both a hydride donor and a nondonor π-electronic system was also studied. Weak interactions were observed in the stacked lumiflavin complexes of benzene, phenol, and indole, mimicking phenyl alanine, tryptophan, and tyrosine side chains, respectively, of an enzyme. The stacked complex of naphthalene and flavin showed little change in flavin's redox potential indicating insignificant effect on the thermodynamics of the hydride transfer reaction. In contrast, the hydride transfer reaction with the hydride donor N-methyl nicotinamide tells a different story, as the transition state was found to be strongly impacted by the stacking interactions. A comparison of performance between the density functional theory (DFT) and the computationally less expensive dispersion-corrected self-consistent density functional tight-binding (SCC-DFTB-D) theory revealed that the latter produces consistent energetics for this hydride transfer reaction and additional DFT-computed perturbative corrections could significantly improve these results.
Collapse
Affiliation(s)
- Caitlin G Bresnahan
- Department of Chemistry, University of Wisconsin-Eau Claire , Eau Claire, Wisconsin 54702, United States
| | | | | | | | | | | |
Collapse
|
35
|
Koziol L, Kumar N, Wong SE, Lightstone FC. Molecular recognition of aromatic rings by flavin: electrostatics and dispersion determine ring positioning above isoalloxazine. J Phys Chem A 2013; 117:12946-52. [PMID: 24229368 DOI: 10.1021/jp407193c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Aromatic stacking interactions between isoalloxazine (ISA) of flavin and three prototypical aromatics (benzene, pyridine, chlorobenzene) were investigated using electronic structure calculations with Monte Carlo simulated annealing. The Effective Fragment Potential (EFP) method was used to locate the low-energy equilibrium configurations for the three dimer systems. These structures were further characterized through DFT (M06-2X) and MP2 calculations. One equilibrium configuration exists for ISA-benzene; characterizing the stacked dimer surface revealed a steep, single-welled potential that funnels benzene directly between rings II and III, positioning a substituent hydrogen adjacent to the redox-active N5. ISA-pyridine and ISA-chlorobenzene minimum-energy structures contain the aromatic ring in very similar position to that in ISA-benzene. However, the added rotational degree of freedom leads to two distinct binding motifs, having approximately antiparallel or parallel dipole moment alignment with ISA. The existence of the latter binding configuration was unexpected but is explained by the shape of the ISA electrostatic potential. Dispersion is the primary noncovalent interaction driving the positioning of aromatic rings above ISA, while electrostatics determine the orientation in dipole-containing substituted benzenes. The interplay of these interactions can be used to tune molecular recognition properties of synthetic redox cofactors, including positioning desired functional groups adjacent to the redox-active N5.
Collapse
Affiliation(s)
- Lucas Koziol
- Physical and Life Sciences Division, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | | | | | | |
Collapse
|