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Anshulata, Vishnoi P, Kanta Sarma B. Conformational Studies of β-Azapeptoid Foldamers: A New Class of Peptidomimetics with Confined Dihedrals. Chemistry 2024; 30:e202303330. [PMID: 37948294 DOI: 10.1002/chem.202303330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/01/2023] [Accepted: 11/06/2023] [Indexed: 11/12/2023]
Abstract
Controlling amide bond geometries and the secondary structures of β-peptoids is a challenging task as they contain several rotatable single bonds in their backbone. Herein, we describe the synthesis and conformational properties of novel "β-azapeptoids" with confined dihedrals. We discuss how the acylhydrazide sidechains in these molecules enforce trans amide geometries (ω ~180°) via steric and stereoelectronic effects. We also show that the Θ(Cα -Cβ ) and Ψ(OC-Cα ) backbone torsions of β-azapeptoids occupy a narrow range (170-180°) that can be rationalized by the staggered conformational preference of the backbone methylene carbons and a novel backbone nO →σ*Cβ-N interaction discovered in this study. However, the ϕ (Cβ -N) torsion remains freely rotatable and, depending on ϕ, the sidechains can be parallel, perpendicular, and anti-parallel relative to each other. In fact, we observed parallel and perpendicular relative orientations of sidechains in the crystal geometries of β-azapeptoid dimers. We show that ϕ of β-azapeptoids can be controlled by incorporating a bulky substituent at the backbone β-carbon, which could provide complete control over all the backbone dihedrals. Finally, we show that the ϕ and Ψ dihedrals of β-azapeptoids resemble that of a PPII helix and they retain PPII structure when incorporated in Host-guest proline peptides.
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Affiliation(s)
- Anshulata
- New Chemistry Unit (NCU), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru, KA-560064, India
| | - Pratap Vishnoi
- New Chemistry Unit (NCU), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru, KA-560064, India
| | - Bani Kanta Sarma
- New Chemistry Unit (NCU), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru, KA-560064, India
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2
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Inoue T, Ota M, Amijima Y, Takahashi H, Hamada S, Nakamura S, Kobayashi Y, Sasamori T, Furuta T. Dual Chalcogen-Bonding Interactions for the Conformational Control of Urea. Chemistry 2023; 29:e202302139. [PMID: 37507838 DOI: 10.1002/chem.202302139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 07/30/2023]
Abstract
Dual chalcogen-bonding interactions is proposed as a novel means for the conformational control of urea derivatives. The formation of a chalcogen-bonding interaction at both sides of the urea carbonyl group was unambiguously confirmed by X-ray diffraction as well as computational studies including non-covalent interaction (NCI) plot index analysis, quantum theory of atoms in molecules (QTAIM) analysis, and natural bond orbital (NBO) analysis via DFT calculations. By virtue of this dual interaction, urea derivatives that bear chalcogen atoms (X=S and Se) adopt a planar structure via the carbonyl oxygen (O) with an X⋅⋅⋅O⋅⋅⋅X arrangement on the same side of the molecule. The rigidity of the conformational lock was evaluated using the molecular arrangement in the crystal and the rotational barrier of benzochalcogenophene ring, which indicated a stronger conformational lock in benzoselenophene than in benzothiophene urea derivatives. Furthermore, the acidity of the urea derivatives increases according to the Lewis-acidic properties of the chalcogen-bonding interactions, whereby benzoselenophene urea is more acidic than benzothiophene urea. Tweezer-shaped urea derivatives were prepared, and their stereostructure proved the viability of the conformational control for defining the location of the substituents on the urea framework.
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Affiliation(s)
- Takumi Inoue
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Moe Ota
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Yui Amijima
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Haru Takahashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Seikou Nakamura
- Department of Pharmacognosy, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Takahiro Sasamori
- Department of Chemistry Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
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3
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Yu H, Li J, Shan C, Lu T, Jiang X, Shi J, Wojtas L, Zhang H, Wang M. Conformational Control of a Metallo-Supramolecular Cage via the Dissymmetrical Modulation of Ligands. Angew Chem Int Ed Engl 2021; 60:26523-26527. [PMID: 34779543 DOI: 10.1002/anie.202111430] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/16/2021] [Indexed: 12/15/2022]
Abstract
In nature as well as life systems, the presence of asymmetrical and dissymmetrical structures with specific functions is extremely common. However, the construction of metallo-supramolecular assemblies based on dissymmetrical ligands still remains a considerable challenge for avoiding the generation of unexpected isomers with similar thermodynamic stabilities, especially for three-dimensional supramolecular structures. In this study, a strategy for the conformational control of metallo-supramolecular cages via the enhancement of ligand dissymmetry was proposed. Four dissymmetrical ditopic ligands were designed and synthesized. By increasing the dissymmetry of length or angle, conformations of assemblies were precisely controlled to form discrete cis-Pdn L2n molecular cages.
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Affiliation(s)
- Hao Yu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Jiaqi Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Chuan Shan
- Department of Chemistry, University of South Florida, Tampa, FL, 33620, USA
| | - Tong Lu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Xin Jiang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Junjuan Shi
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Lukasz Wojtas
- Department of Chemistry, University of South Florida, Tampa, FL, 33620, USA
| | - Houyu Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
| | - Ming Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China
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4
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Bosch E, Bowling NP, Oburn SM. Conformational control through co-operative nonconventional C-H...N hydrogen bonds. Acta Crystallogr C Struct Chem 2021; 77:485-489. [PMID: 34350846 DOI: 10.1107/s2053229621007427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/19/2021] [Indexed: 11/10/2022]
Abstract
We report the design, synthesis, and crystal structure of a conjugated aryleneethynyl molecule, 2-(2-{4,5-dimethoxy-2-[2-(2,3,4-trifluorophenyl)ethynyl]phenyl}ethynyl)-6-[2-(pyridin-2-yl)ethynyl]pyridine, C30H17F3N2O2, that adopts a planar rhombus conformation in the solid state. The molecule crystallizes in the space group P-1, with Z = 2, and features two intramolecular sp2-C-H...N hydrogen bonds that co-operatively hold the arylethynyl molecule in a rhombus conformation. The H atoms are activated towards hydrogen bonding since they are situated on a trifluorophenyl ring and the H...N distances are 2.470 (16) and 2.646 (16) Å, with C-H...N angles of 161.7 (2) and 164.7 (2)°, respectively. Molecular electrostatic potential calculations support the formation of C-H...N hydrogen bonds to the trifluorophenyl moiety. Hirshfeld surface analysis identifies a self-complementary C-H...O dimeric interaction between adjacent 1,2-dimethoxybenzene segments that is shown to be common in structures containing that moiety.
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Affiliation(s)
- Eric Bosch
- Chemistry Department, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA
| | - Nathan P Bowling
- Department of Chemistry, University of Wisconsin-Stevens Point, 2001 Fourth Avenue, Stevens Point, WI 54481, USA
| | - Shalisa M Oburn
- Chemistry Department, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA
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5
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Brötz-Oesterhelt H, Vorbach A. Reprogramming of the Caseinolytic Protease by ADEP Antibiotics: Molecular Mechanism, Cellular Consequences, Therapeutic Potential. Front Mol Biosci 2021; 8:690902. [PMID: 34109219 PMCID: PMC8182300 DOI: 10.3389/fmolb.2021.690902] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 04/28/2021] [Indexed: 12/14/2022] Open
Abstract
Rising antibiotic resistance urgently calls for the discovery and evaluation of novel antibiotic classes and unique antibiotic targets. The caseinolytic protease Clp emerged as an unprecedented target for antibiotic therapy 15 years ago when it was observed that natural product-derived acyldepsipeptide antibiotics (ADEP) dysregulated its proteolytic core ClpP towards destructive proteolysis in bacterial cells. A substantial database has accumulated since on the interaction of ADEP with ClpP, which is comprehensively compiled in this review. On the molecular level, we describe the conformational control that ADEP exerts over ClpP, the nature of the protein substrates degraded, and the emerging structure-activity-relationship of the ADEP compound class. On the physiological level, we review the multi-faceted antibacterial mechanism, species-dependent killing modes, the activity against carcinogenic cells, and the therapeutic potential of the compound class.
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Affiliation(s)
- Heike Brötz-Oesterhelt
- Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tuebingen, Tübingen, Germany.,Cluster of Excellence: Controlling Microbes to Fight Infection, Tübingen, Germany
| | - Andreas Vorbach
- Microbial Bioactive Compounds, Interfaculty Institute of Microbiology and Infection Medicine, University of Tuebingen, Tübingen, Germany
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Del Giudice D, Spatola E, Cacciapaglia R, Casnati A, Baldini L, Ercolani G, Di Stefano S. Time Programmable Locking/Unlocking of the Calix[4]arene Scaffold by Means of Chemical Fuels. Chemistry 2020; 26:14954-14962. [PMID: 32757429 DOI: 10.1002/chem.202002574] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/18/2020] [Indexed: 12/30/2022]
Abstract
In this work, we report that 2-cyano-2-phenylpropanoic acid and its p-Cl, p-CH3 and p-OCH3 derivatives can be used as chemical fuels to control the geometry of the calix[4]arene scaffold in its cone conformation. It is shown that, under the action of the fuel, the cone calix[4]arene platform assumes a "locked" shape with two opposite aromatic rings strongly convergent and the other two strongly divergent ("pinched cone" conformation). Only when the fuel is exhausted, the cone calix[4]arene scaffold returns to its resting, "unlocked" shape. Remarkably, the duration of the "locked" state can be controlled at will by varying the fuel structure or amount. A kinetic study of the process shows that the consume of the fuel is catalyzed by the "unlocked" calixarene that behaves as an autocatalyst for its own production. A mechanism is proposed for the reaction of fuel consumption.
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Affiliation(s)
- Daniele Del Giudice
- Dipartimento di Chimica, Università di Roma La Sapienza and ISB-CNR Sede Secondaria di Roma-Meccanismi di Reazione, P.le A. Moro 5, 00185, Roma, Italy
| | - Emanuele Spatola
- Dipartimento di Chimica, Università di Roma La Sapienza and ISB-CNR Sede Secondaria di Roma-Meccanismi di Reazione, P.le A. Moro 5, 00185, Roma, Italy
| | - Roberta Cacciapaglia
- Dipartimento di Chimica, Università di Roma La Sapienza and ISB-CNR Sede Secondaria di Roma-Meccanismi di Reazione, P.le A. Moro 5, 00185, Roma, Italy
| | - Alessandro Casnati
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità, Ambientale, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - Laura Baldini
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità, Ambientale, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - Gianfranco Ercolani
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
| | - Stefano Di Stefano
- Dipartimento di Chimica, Università di Roma La Sapienza and ISB-CNR Sede Secondaria di Roma-Meccanismi di Reazione, P.le A. Moro 5, 00185, Roma, Italy
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7
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Shyam R, Nauton L, Angelici G, Roy O, Taillefumier C, Faure S. NCα-gem-dimethylated peptoid side chains: A novel approach for structural control and peptide sequence mimetics. Biopolymers 2019; 110:e23273. [PMID: 30897209 DOI: 10.1002/bip.23273] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 01/05/2023]
Abstract
The design of linear peptoid oligomers adopting well-defined secondary structures while mimicking defined peptide primary sequences is a major challenge in the context of drug discovery. To this end, chemists have developed cis-inducing peptoid side chains to build robust polyproline type I helices. However, the number of efficient examples remains scarce and chemical diversity accessible through the use of these side chains is limited. Herein, we introduce an array of NCα-gem-dimethylated peptoid residues mimicking proteinogenic amino acids. Submonomer synthesis and block-coupling approaches were explored to access heterooligomers incorporating these novel types of side chains. NMR studies of monomer and trimer models showed that the NCα-gem-dimethylated groups exert complete cis control on the backbone amide conformation. Lastly, a preliminary molecular modeling study gave an insight into the preferred orientation of the substituents of the NCα-gem-dimethyl side chains relative to the peptoid backbone.
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Affiliation(s)
- Radhe Shyam
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Lionel Nauton
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Gaetano Angelici
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Olivier Roy
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Claude Taillefumier
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
| | - Sophie Faure
- Université Clermont Auvergne, CNRS, SIGMA Clermont, ICCF, F-63000 Clermont-Ferrand, France
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8
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Roe LT, Pelton JG, Edison JR, Butterfoss GL, Tresca BW, LaFaye BA, Whitelam S, Wemmer DE, Zuckermann RN. Unconstrained peptoid tetramer exhibits a predominant conformation in aqueous solution. Biopolymers 2019; 110:e23267. [PMID: 30835821 DOI: 10.1002/bip.23267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 01/29/2019] [Accepted: 02/12/2019] [Indexed: 12/11/2022]
Abstract
Conformational control in peptoids, N-substituted glycines, is crucial for the design and synthesis of biologically-active compounds and atomically-defined nanomaterials. While there are a growing number of structural studies in solution, most have been performed with conformationally-constrained short sequences (e.g., sterically-hindered sidechains or macrocyclization). Thus, the inherent degree of heterogeneity of unconstrained peptoids in solution remains largely unstudied. Here, we explored the folding landscape of a series of simple peptoid tetramers in aqueous solution by NMR spectroscopy. By incorporating specific 13 C-probes into the backbone using bromoacetic acid-2-13 C as a submonomer, we developed a new technique for sequential backbone assignment of peptoids based on the 1,n-Adequate pulse sequence. Unexpectedly, two of the tetramers, containing an N-(2-aminoethyl)glycine residue (Nae), had preferred conformations. NMR and molecular dynamics studies on one of the tetramers showed that the preferred conformer (52%) had a trans-cis-trans configuration about the three amide bonds. Moreover, >80% of the ensemble contained a cis amide bond at the central amide. The backbone dihedral angles observed fall directly within the expected minima in the peptoid Ramachandran plot. Analysis of this compound against similar peptoid analogs suggests that the commonly used Nae monomer plays a key role in the stabilization of peptoid structure via a side-chain-to-main-chain interaction. This discovery may offer a simple, synthetically high-yielding approach to control peptoid structure, and suggests that peptoids have strong intrinsic conformational preferences in solution. These findings should facilitate the predictive design of folded peptoid structures, and accelerate application in areas ranging from drug discovery to biomimetic nanoscience.
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Affiliation(s)
- Leah T Roe
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California
| | | | - John R Edison
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California
| | - Glenn L Butterfoss
- Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Blakely W Tresca
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California.,Department of Chemistry, Kalamazoo College, Kalamazoo, Michigan
| | - Bridgette A LaFaye
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California
| | - Stephen Whitelam
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California
| | - David E Wemmer
- Department of Chemistry, University of California, Berkeley, California
| | - Ronald N Zuckermann
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California
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Wang K, Shi YZ, Zheng CJ, Liu W, Liang K, Li X, Zhang M, Lin H, Tao SL, Lee CS, Ou XM, Zhang XH. Control of Dual Conformations: Developing Thermally Activated Delayed Fluorescence Emitters for Highly Efficient Single-Emitter White Organic Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:31515-31525. [PMID: 30132326 DOI: 10.1021/acsami.8b08083] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In this work, we propose a novel concept to develop two fluorophores 2-(10 H-phenothiazin-10-yl)thianthrene 5,5,10,10-tetraoxide (PTZ-TTR) and 2-(4-(10 H-phenothiazin-10-yl)phenyl)thianthrene 5,5,10,10-tetraoxide (PTZ-Ph-TTR) showing dual conformations for highly efficient single-emitter white organic light-emitting diodes (WOLEDs). Both molecules exist in two stable conformations. Their nearly orthogonal forms own lower energy levels and show thermally activated delayed fluorescence (TADF) characteristics, whereas their nearly planar conformers possess higher energy levels and show only prompt fluorescence. These dual conformers were exploited for fabricating WOLEDs with complementary emission colors contributed by the two conformations. Moreover, the originally wasted triplet energy on the nearly planar conformation can be transferred to the nearly orthogonal one and then harvested via the TADF channel, realizing full exciton utilization. A PTZ-TTR-based single-emitter device exhibits standard white emission with a CIE coordinate of (0.33, 0.33) and a high color rendering index value of 92. On the other hand, the PTZ-Ph-TTR-based single-emitter device realizes an emission approaching warm white light and a high maximum external quantum efficiency of 16.34%. These results demonstrate an alternative approach for designing high-performance WOLEDs based on single TADF emitters.
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Affiliation(s)
- Kai Wang
- School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu , Sichuan 610054 , P. R. China
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Yi-Zhong Shi
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Cai-Jun Zheng
- School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu , Sichuan 610054 , P. R. China
| | - Wei Liu
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Ke Liang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Xing Li
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Ming Zhang
- School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu , Sichuan 610054 , P. R. China
| | - Hui Lin
- School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu , Sichuan 610054 , P. R. China
| | - Si-Lu Tao
- School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu , Sichuan 610054 , P. R. China
| | - Chun-Sing Lee
- Department of Chemistry and Center of Super-Diamond and Advanced Films (COSDAF) , City University of Hong Kong , Kowloon 999077 , Hong Kong SAR , P. R. China
| | - Xue-Mei Ou
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
| | - Xiao-Hong Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China
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10
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Danyal K, Shaw S, Page TR, Duval S, Horitani M, Marts AR, Lukoyanov D, Dean DR, Raugei S, Hoffman BM, Seefeldt LC, Antony E. Negative cooperativity in the nitrogenase Fe protein electron delivery cycle. Proc Natl Acad Sci U S A 2016; 113:E5783-91. [PMID: 27698129 DOI: 10.1073/pnas.1613089113] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Nitrogenase catalyzes the ATP-dependent reduction of dinitrogen (N2) to two ammonia (NH3) molecules through the participation of its two protein components, the MoFe and Fe proteins. Electron transfer (ET) from the Fe protein to the catalytic MoFe protein involves a series of synchronized events requiring the transient association of one Fe protein with each αβ half of the α2β2 MoFe protein. This process is referred to as the Fe protein cycle and includes binding of two ATP to an Fe protein, association of an Fe protein with the MoFe protein, ET from the Fe protein to the MoFe protein, hydrolysis of the two ATP to two ADP and two Pi for each ET, Pi release, and dissociation of oxidized Fe protein-(ADP)2 from the MoFe protein. Because the MoFe protein tetramer has two separate αβ active units, it participates in two distinct Fe protein cycles. Quantitative kinetic measurements of ET, ATP hydrolysis, and Pi release during the presteady-state phase of electron delivery demonstrate that the two halves of the ternary complex between the MoFe protein and two reduced Fe protein-(ATP)2 do not undergo the Fe protein cycle independently. Instead, the data are globally fit with a two-branch negative-cooperativity kinetic model in which ET in one-half of the complex partially suppresses this process in the other. A possible mechanism for communication between the two halves of the nitrogenase complex is suggested by normal-mode calculations showing correlated and anticorrelated motions between the two halves.
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11
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Wang Y, Aurelio D, Li W, Tseng P, Zheng Z, Li M, Kaplan DL, Liscidini M, Omenetto FG. Modulation of Multiscale 3D Lattices through Conformational Control: Painting Silk Inverse Opals with Water and Light. Adv Mater 2017; 29. [PMID: 28833734 DOI: 10.1002/adma.201702769] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 06/23/2017] [Indexed: 05/03/2023]
Abstract
Structural proteins from naturally occurring materials are an inspiring template for material design and synthesis at multiple scales. The ability to control the assembly and conformation of such materials offers the opportunity to define fabrication approaches that recapitulate the dimensional hierarchy and structure-function relationships found in nature. A simple and versatile directed assembly method of silk fibroin, which allows the design of structures across multiple dimensional scales by generating and tuning structural color in large-scale, macro defect-free colloidally assembled 3D nanostructures in the form of silk inverse opals (SIOs) is reported. This approach effectively combines bottom-up and top-down techniques to obtain control on the nanoscale (through silk conformational changes), microscale (through patterning), and macroscale (through colloidal assembly), ultimately resulting in a controllable photonic lattice with predefined spectral behavior, with a resulting palette spanning almost the entire visible range. As a demonstration of the approach, examples of "multispectral" SIOs, paired with theoretical calculations and analysis of their response as a function of changes of lattice constants and refractive index contrast are illustrated.
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Affiliation(s)
- Yu Wang
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
| | - Daniele Aurelio
- Dipartimento di Fisica, Università degli Studi di Pavia, via A. Bassi 6, 27100, Pavia, Italy
| | - Wenyi Li
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
| | - Peter Tseng
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
| | - Zhaozhu Zheng
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
| | - Meng Li
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
| | - Marco Liscidini
- Dipartimento di Fisica, Università degli Studi di Pavia, via A. Bassi 6, 27100, Pavia, Italy
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
- Silklab, Tufts University, 200 Boston Avenue, Medford, MA, 02155, USA
- Department of Physics, Tufts University, 4 Colby Street, Medford, MA, 02155, USA
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