51
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Zhu R, Li QS, Li ZS. Nitrogen substitution improves the mobility and stability of electron transport materials for inverted perovskite solar cells. NANOSCALE 2018; 10:17873-17883. [PMID: 30221265 DOI: 10.1039/c8nr05588b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A suitable electron transport material (ETM) plays key roles in efficient perovskite solar cells (PSCs), because it is beneficial for exciton dissociation and charge transport at the interface thus increasing the short circuit current density. Based on the experimentally reported efficient electron transport molecule 10,14-bis(5-(2-ethylhexyl)thiophen-2-yl)-dipyrido[3,2-a:2',3'-c][1,2,5]thiadiazolo[3,4-i]phenazine (TDTP), we theoretically design a set of new ETMs (TDTP-1, TDTP-2a, TDTP-2b, TDTP-3a, and TDTP-3b) by introducing a nitrogen atom into the thiophene ring or replacing a hydrogen atom on the methyl with an amino group. Quantum-chemical calculations reveal that the designed molecules behave much better than TDTP in terms of electron mobility, air stability, and solubility, where the electron mobility of TDTP-3b is two orders of magnitude higher than that of TDTP owing to the extra SN interactions in TDTP-3b that lead to the quasi two-dimensional π packing motif which facilitates electron transport evidently. Moreover, we find that the substitution effect of the nitrogen atom strongly depends on the position, where the nitrogen atom at the β-position of the thiophene ring (TDTP-2b and TDTP-3b) is more conducive to electron transport. Importantly, our calculations show that the ETM/perovskite interface interaction is enhanced after the introduction of the nitrogen atom and amino group thanks to the added NPb interaction, which favors electron transport with the newly designed ETMs. Our results not only report a set of novel promising ETMs, but also provide a useful design strategy for efficient ETMs.
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Affiliation(s)
- Rui Zhu
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 100081 Beijing, China.
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52
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Roberts MF, Khan HM, Goldstein R, Reuter N, Gershenson A. Search and Subvert: Minimalist Bacterial Phosphatidylinositol-Specific Phospholipase C Enzymes. Chem Rev 2018; 118:8435-8473. [DOI: 10.1021/acs.chemrev.8b00208] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Mary F. Roberts
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | | | - Rebecca Goldstein
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | | | - Anne Gershenson
- Department of Biochemistry and Molecular Biology, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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53
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Panja SK, Srivastava N, Srivastava J, Prasad NE, Noothalapati H, Shigeto S, Saha S. Evidence of C--F-P and aromatic π--F-P weak interactions in imidazolium ionic liquids and its consequences. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 194:117-125. [PMID: 29331812 DOI: 10.1016/j.saa.2017.12.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 11/28/2017] [Accepted: 12/14/2017] [Indexed: 06/07/2023]
Abstract
A simple change from alkyl group to alkene in side chain of imidazolium cation with same anion resulted in a drastic impact on physical properties (e.g., melting point) from bmimPF6 IL to cmimPF6 IL. The underlying reasons have been elucidated by structural and interaction studies with the help of DSC, SCXRD, vibrational and multi-nuclear NMR spectroscopic techniques. Experiments reveal existence of new weak interactions involving the carbon and π cloud of the imidazolium aromatic ring with fluoride of PF6 anion (i.e., C2--F-P and π--F-P) in cmimPF6 but are absent in structurally similar prototype IL, bmimPF6. Though weak, these interactions helped to form ladder type supramolecular arrangement, resulting in quite high melting point for cmimPF6 IL compared to bmimPF6 IL. These findings emphasize that an IL system can behave uniquely because of the existence of uncommon weak interactions.
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Affiliation(s)
- Sumit Kumar Panja
- Department of Chemistry, Centre for Advanced Studies, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Nitin Srivastava
- Department of Chemistry, Centre for Advanced Studies, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Jyoti Srivastava
- Defence Materials and Stores Research and Development Establishment (DMSRDE), Kanpur, Uttar Pradesh, India
| | - Namburi Eswara Prasad
- Defence Materials and Stores Research and Development Establishment (DMSRDE), Kanpur, Uttar Pradesh, India
| | - Hemanth Noothalapati
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Shinsuke Shigeto
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Satyen Saha
- Department of Chemistry, Centre for Advanced Studies, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India.
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54
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Nowakowska S, Mazzola F, Alberti MN, Song F, Voigt T, Nowakowski J, Wäckerlin A, Wäckerlin C, Wiss J, Schweizer WB, Broszio M, Polley C, Leandersson M, Fatayer S, Ivas T, Baljozovic M, Mousavi SF, Ahsan A, Nijs T, Popova O, Zhang J, Muntwiler M, Thilgen C, Stöhr M, Pasti IA, Skorodumova NV, Diederich F, Wells J, Jung TA. Adsorbate-Induced Modification of the Confining Barriers in a Quantum Box Array. ACS NANO 2018; 12:768-778. [PMID: 29272579 DOI: 10.1021/acsnano.7b07989] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Quantum devices depend on addressable elements, which can be modified separately and in their mutual interaction. Self-assembly at surfaces, for example, formation of a porous (metal-) organic network, provides an ideal way to manufacture arrays of identical quantum boxes, arising in this case from the confinement of the electronic (Shockley) surface state within the pores. We show that the electronic quantum box state as well as the interbox coupling can be modified locally to a varying extent by a selective choice of adsorbates, here C60, interacting with the barrier. In view of the wealth of differently acting adsorbates, this approach allows for engineering quantum states in on-surface network architectures.
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Affiliation(s)
- Sylwia Nowakowska
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Federico Mazzola
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology (NTNU) , Høgskoleringen 5, Realfagbygget D5-170, 7491 Trondheim, Norway
| | - Mariza N Alberti
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Fei Song
- Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
- Shanghai Institute of Applied Physics , Chinese Academy of Sciences, 201204 Shanghai, P. R. China
| | - Tobias Voigt
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Jan Nowakowski
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - Aneliia Wäckerlin
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Christian Wäckerlin
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute , 5232 Villigen, Switzerland
- Empa, Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Jérôme Wiss
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - W Bernd Schweizer
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Max Broszio
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Craig Polley
- MAX IV Laboratory, Lund University , P.O. Box 118, 22100 Lund, Sweden
| | - Mats Leandersson
- MAX IV Laboratory, Lund University , P.O. Box 118, 22100 Lund, Sweden
| | - Shadi Fatayer
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
- Departamento de Física Aplicada, Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas , Campinas 13083-859, Brazil
| | - Toni Ivas
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Milos Baljozovic
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - S Fatemeh Mousavi
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Aisha Ahsan
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Thomas Nijs
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Olha Popova
- Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Jun Zhang
- Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - Matthias Muntwiler
- Laboratory for Synchrotron Radiation - Condensed Matter, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - Carlo Thilgen
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Meike Stöhr
- Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Igor A Pasti
- Faculty of Physical Chemistry, University of Belgrade , Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Natalia V Skorodumova
- Department of Materials Science and Engineering, KTH - Royal Institute of Technology , Brinellvägen 23, 100 44 Stockholm, Sweden
- Department of Physics and Astronomy, Uppsala University , Box 516, 751 20 Uppsala, Sweden
| | - François Diederich
- Laboratory of Organic Chemistry, ETH Zürich , Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Justin Wells
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology (NTNU) , Høgskoleringen 5, Realfagbygget D5-170, 7491 Trondheim, Norway
| | - Thomas A Jung
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute , 5232 Villigen, Switzerland
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55
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Luo W, Nie H, He B, Zhao Z, Peng Q, Tang BZ. Spectroscopic and Theoretical Characterization of Through-Space Conjugation of Foldamers with a Tetraphenylethene Hinge. Chemistry 2017; 23:18041-18048. [DOI: 10.1002/chem.201704182] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Wenwen Luo
- Center for Aggregation-Induced Emission; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 P.R. China
| | - Han Nie
- Center for Aggregation-Induced Emission; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 P.R. China
| | - Bairong He
- Center for Aggregation-Induced Emission; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 P.R. China
| | - Zujin Zhao
- Center for Aggregation-Induced Emission; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 P.R. China
| | - Qian Peng
- Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Science, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Ben Zhong Tang
- Center for Aggregation-Induced Emission; State Key Laboratory of Luminescent Materials and Devices; South China University of Technology; Guangzhou 510640 P.R. China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction; The Hong Kong University of Science & Technology, Kowloon; Hong Kong P.R. China
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56
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Kubyshkin V, Budisa N. Hydrolysis, polarity, and conformational impact of C-terminal partially fluorinated ethyl esters in peptide models. Beilstein J Org Chem 2017; 13:2442-2457. [PMID: 29234471 PMCID: PMC5704756 DOI: 10.3762/bjoc.13.241] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 10/19/2017] [Indexed: 12/17/2022] Open
Abstract
Fluorinated moieties are highly valuable to chemists due to the sensitive NMR detectability of the 19F nucleus. Fluorination of molecular scaffolds can also selectively influence a molecule's polarity, conformational preferences and chemical reactivity, properties that can be exploited for various chemical applications. A powerful route for incorporating fluorine atoms in biomolecules is last-stage fluorination of peptide scaffolds. One of these methods involves esterification of the C-terminus of peptides using a diazomethane species. Here, we provide an investigation of the physicochemical consequences of peptide esterification with partially fluorinated ethyl groups. Derivatives of N-acetylproline are used to model the effects of fluorination on the lipophilicity, hydrolytic stability and on conformational properties. The conformational impact of the 2,2-difluoromethyl ester on several neutral and charged oligopeptides was also investigated. Our results demonstrate that partially fluorinated esters undergo variable hydrolysis in biologically relevant buffers. The hydrolytic stability can be tailored over a broad pH range by varying the number of fluorine atoms in the ester moiety or by introducing adjacent charges in the peptide sequence.
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Affiliation(s)
- Vladimir Kubyshkin
- Biocatalysis group, Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Strasse 10, Berlin 10623, Germany
| | - Nediljko Budisa
- Biocatalysis group, Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Strasse 10, Berlin 10623, Germany
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57
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Hosseini AS, Pace CJ, Esposito AA, Gao J. Non-additive stabilization by halogenated amino acids reveals protein plasticity on a sub-angstrom scale. Protein Sci 2017; 26:2051-2058. [PMID: 28737009 PMCID: PMC5606540 DOI: 10.1002/pro.3242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 07/20/2017] [Accepted: 07/20/2017] [Indexed: 01/21/2023]
Abstract
It has been a long-standing goal to understand the structure-stability relationship of proteins, as optimal stability is essential for protein function and highly desirable for protein therapeutics. Halogenation has emerged as a minimally invasive strategy to probe the physical characteristics of proteins in solution, as well as enhance the structural stabilities of proteins for therapeutic applications. Although advances in synthetic chemistry and genetic code expansion have allowed for the rapid synthesis of proteins with diverse chemical sequences, much remains to be learned regarding the impact of these mutations on their structural integrity. In this contribution, we present a systematic study of three well-folded model protein systems, in which their structural stabilities are assessed in response to various hydrogen-to-halogen atom mutations. Halogenation allows for the perturbation of proteins on a sub-angstrom scale, offering unprecedented precision of protein engineering. The thermodynamic results from these model systems reveal that in certain cases, proteins can display modest steric tolerance to halogenation, yielding non-additive consequences to protein stability. The observed sub-angstrom sensitivity of protein stability highlights the delicate arrangement of a folded protein core structure. The stability data of various halogenated proteins presented herein should also provide guidelines for using halogenation as a strategy to improve the stability of protein therapeutics.
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Affiliation(s)
- Azade S. Hosseini
- Department of ChemistryMerkert Chemistry Center, Boston CollegeChestnut HillMassachusetts02467
- Present address:
Department of ChemistryMassachusetts Institute of Technology77 Massachusetts Avenue, CambridgeMassachusetts02139
| | - Christopher J. Pace
- Department of ChemistryMerkert Chemistry Center, Boston CollegeChestnut HillMassachusetts02467
| | - Adam A. Esposito
- Department of ChemistryMerkert Chemistry Center, Boston CollegeChestnut HillMassachusetts02467
| | - Jianmin Gao
- Department of ChemistryMerkert Chemistry Center, Boston CollegeChestnut HillMassachusetts02467
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58
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Park NH, Gomes GDP, Fevre M, Jones GO, Alabugin IV, Hedrick JL. Organocatalyzed synthesis of fluorinated poly(aryl thioethers). Nat Commun 2017; 8:166. [PMID: 28761127 PMCID: PMC5537313 DOI: 10.1038/s41467-017-00186-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 06/08/2017] [Indexed: 11/23/2022] Open
Abstract
The preparation of high-performance fluorinated poly(aryl thioethers) has received little attention compared to the corresponding poly(aryl ethers), despite the excellent physical properties displayed by many polysulfides. Herein, we report a highly efficient route to fluorinated poly(aryl thioethers) via an organocatalyzed nucleophilic aromatic substitution of silyl-protected dithiols. This approach requires low catalyst loadings, proceeds rapidly at room temperature, and is effective for many different perfluorinated or highly activated aryl monomers. Computational investigations of the reaction mechanism reveal an unexpected, concerted SNAr mechanism, with the organocatalyst playing a critical, dual-activation role in facilitating the process. Not only does this remarkable reactivity enable rapid access to fluorinated poly(aryl thioethers), but also opens new avenues for the processing, fabrication, and functionalization of fluorinated materials with easy removal of the volatile catalyst and TMSF byproducts. Fluorinated poly(aryl thioethers), unlike their poly(aryl ethers) counterparts, have received little attention despite excellent physical properties displayed by many polysulfides. Here the authors show a highly efficient route to fluorinated poly(aryl thioethers) via an organocatalyzed nucleophilic aromatic substitution of silyl-protected dithiols.
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Affiliation(s)
- Nathaniel H Park
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA, 95120, USA
| | | | - Mareva Fevre
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA, 95120, USA
| | - Gavin O Jones
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA, 95120, USA
| | - Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32310, USA
| | - James L Hedrick
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA, 95120, USA.
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59
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Senaweera S, Weaver JD. S NAr catalysis enhanced by an aromatic donor-acceptor interaction; facile access to chlorinated polyfluoroarenes. Chem Commun (Camb) 2017. [PMID: 28634609 DOI: 10.1039/c7cc03996d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective catalytic SNAr reaction of polyfluoroaryl C-F bonds with chloride is shown. Stoichiometric TMSCl makes the reaction exergonic and allows catalysis, which involves ground state elevation of chloride, aromatic donor-acceptor interactions, and stabilization of the Meisenheimer complex. Traditional cross-coupling of the products is now possible and demonstrates the utility.
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Affiliation(s)
- Sameera Senaweera
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
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60
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Yu Z, Erbas A, Tantakitti F, Palmer LC, Jackman JA, Olvera de la Cruz M, Cho NJ, Stupp SI. Co-assembly of Peptide Amphiphiles and Lipids into Supramolecular Nanostructures Driven by Anion−π Interactions. J Am Chem Soc 2017; 139:7823-7830. [DOI: 10.1021/jacs.7b02058] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Zhilin Yu
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Aykut Erbas
- Department
of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Faifan Tantakitti
- Department
of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Liam C. Palmer
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Simpson
Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
| | - Joshua A. Jackman
- School
of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
- Centre for
Biomimetic Sensor Science, Nanyang Technological University, 639798 Singapore
| | - Monica Olvera de la Cruz
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Department
of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department
of Physics, Northwestern University, Evanston, Illinois 60208, United States
| | - Nam-Joon Cho
- School
of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
- Centre for
Biomimetic Sensor Science, Nanyang Technological University, 639798 Singapore
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 639798 Singapore
| | - Samuel I. Stupp
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Department
of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Simpson
Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
- Department
of Medicine, Northwestern University, Chicago, Illinois 60611, United States
- Department
of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
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61
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Sharber SA, Baral RN, Frausto Arellano F, Haas TE, Müller P, Thomas Iii SW. Substituent Effects That Control Conjugated Oligomer Conformation through Non-covalent Interactions. J Am Chem Soc 2017; 139:5164-5174. [PMID: 28362486 DOI: 10.1021/jacs.7b00878] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Although understanding the conformations and arrangements of conjugated materials as solids is key to their prospective applications, predictive power over these structural factors remains elusive. In this work, substituent effects tune non-covalent interactions between side-chain fluorinated benzyl esters and main-chain terminal arenes, in turn controlling the conformations and interchromophore aggregation of three-ring phenylene-ethynylenes (PEs). Cofacial fluoroarene-arene (ArF-ArH) interactions cause twisting in the PE backbone, interrupting intramolecular conjugation as well as blocking chromophore aggregation, both of which prevent the typically observed bathochromic shift observed upon transitioning PEs from solution to solid. This work highlights two structural factors that determine whether the ArF-ArH interactions, and the resulting twisted, unaggregated chromophores, occur in these solids: (i) the electron-releasing characteristic of substituents on ArH, with more electron-releasing character favoring ArF-ArH interactions, and (ii) the fluorination pattern of the ArF ring, with 2,3,4,5,6-pentafluorophenyl favoring ArF-ArH interactions over 2,4,6-trifluorophenyl. These trends indicate that considerations of electrostatic complementarity, whether through a polar-π or substituent-substituent mechanism, can serve as an effective design principle in controlling the interaction strengths, and therefore the optoelectronic properties, of these molecules as solids.
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Affiliation(s)
- Seth A Sharber
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
| | - Rom Nath Baral
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
| | | | - Terry E Haas
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Samuel W Thomas Iii
- Department of Chemistry, Tufts University , Medford, Massachusetts 02155, United States
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62
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Liu Y, Miao K, Dunham NP, Liu H, Fares M, Boal AK, Li X, Zhang X. The Cation-π Interaction Enables a Halo-Tag Fluorogenic Probe for Fast No-Wash Live Cell Imaging and Gel-Free Protein Quantification. Biochemistry 2017; 56:1585-1595. [PMID: 28221782 PMCID: PMC5362743 DOI: 10.1021/acs.biochem.7b00056] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
![]()
The design of fluorogenic
probes for a Halo tag is highly desirable
but challenging. Previous work achieved this goal by controlling the
chemical switch of spirolactones upon the covalent conjugation between
the Halo tag and probes or by incorporating a “channel dye”
into the substrate binding tunnel of the Halo tag. In this work, we
have developed a novel class of Halo-tag fluorogenic probes that are
derived from solvatochromic fluorophores. The optimal probe, harboring
a benzothiadiazole scaffold, exhibits a 1000-fold fluorescence enhancement
upon reaction with the Halo tag. Structural, computational, and biochemical
studies reveal that the benzene ring of a tryptophan residue engages
in a cation−π interaction with the dimethylamino electron-donating
group of the benzothiadiazole fluorophore in its excited state. We
further demonstrate using noncanonical fluorinated tryptophan that
the cation−π interaction directly contributes to the
fluorogenicity of the benzothiadiazole fluorophore. Mechanistically,
this interaction could contribute to the fluorogenicity by promoting
the excited-state charge separation and inhibiting the twisting motion
of the dimethylamino group, both leading to an enhanced fluorogenicity.
Finally, we demonstrate the utility of the probe in no-wash direct
imaging of Halo-tagged proteins in live cells. In addition, the fluorogenic
nature of the probe enables a gel-free quantification of fusion proteins
expressed in mammalian cells, an application that was not possible
with previously nonfluorogenic Halo-tag probes. The unique mechanism
revealed by this work suggests that incorporation of an excited-state
cation−π interaction could be a feasible strategy for
enhancing the optical performance of fluorophores and fluorogenic
sensors.
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Affiliation(s)
| | | | | | - Hongbin Liu
- Department of Chemistry, University of Washington , Seattle, Washington 98105, United States
| | | | | | - Xiaosong Li
- Department of Chemistry, University of Washington , Seattle, Washington 98105, United States
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63
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Ye H, Hai Y, Ren Y, You L. Versatile Dynamic Covalent Assemblies for Probing π-Stacking and Chirality Induction from Homotopic Faces. Chemistry 2017; 23:3804-3809. [DOI: 10.1002/chem.201606040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Hebo Ye
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou 350002 P.R. China
| | - Yu Hai
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou 350002 P.R. China
- College of Material Science and Engineering; Fujian Normal University; Fuzhou 350007 P.R. China
| | - Yulong Ren
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou 350002 P.R. China
| | - Lei You
- State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou 350002 P.R. China
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Li Y, Qiu G, Wang H, Sheng J. Generation of trifluoromethyl thiolsulphonate through one-pot reaction of sulfonyl chloride and trifluoromethanesulfanylamides. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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65
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Abstract
As methods to incorporate noncanonical amino acid residues into proteins have become more powerful, interest in their use to modify the physical and biological properties of proteins and enzymes has increased. This chapter discusses the use of highly fluorinated analogs of hydrophobic amino acids, for example, hexafluoroleucine, in protein design. In particular, fluorinated residues have proven to be generally effective in increasing the thermodynamic stability of proteins. The chapter provides an overview of the different fluorinated amino acids that have been used in protein design and the various methods available for producing fluorinated proteins. It discusses model proteins systems into which highly fluorinated amino acids have been introduced and the reasons why fluorinated residues are generally stabilizing, with particular reference to thermodynamic and structural studies from our laboratory. Lastly, details of the methodology we have developed to measure the thermodynamic stability of oligomeric fluorinated proteins are presented, as this may be generally applicable to many proteins.
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Affiliation(s)
- E N G Marsh
- University of Michigan, Ann Arbor, MI, United States.
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66
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Hsu WL, Shih TC, Horng JC. Folding stability modulation of the villin headpiece helical subdomain by 4-fluorophenylalanine and 4-methylphenylalanine. Biopolymers 2016; 103:627-37. [PMID: 26017817 DOI: 10.1002/bip.22689] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 05/25/2015] [Accepted: 05/25/2015] [Indexed: 11/10/2022]
Abstract
HP36, the helical subdomain of villin headpiece, contains a hydrophobic core composed of three phenylalanine residues (Phe47, Phe51, and Phe58). Hydrophobic effects and electrostatic interactions were shown to be the critical factors in stabilizing this core and the global structure. To assess the interactions among Phe47, Phe51, and Phe58 residues and investigate how they affect the folding stability, we implanted 4-fluorophenylalanine (Z) and 4-methylphenylalanine (X) into the hydrophobic core of HP36. We chemically synthesized HP36 and its seven variants including four single mutants whose Phe51 or Phe58 was replaced with Z or X, and three double mutants whose Phe51 and Phe58 were both substituted. Circular dichroism and nuclear magnetic resonance measurements show that the variants exhibit a native HP36 like fold, of which F51Z and three double mutants are more stable than the wild type. Molecular modeling provided detailed interaction energy within the phenylalanine residues, revealing that electrostatic interactions dominate the stability modulation upon the introduction of 4-fluorophenylalanine and 4-methylphenylalanine. Our results show that these two non-natural amino acids can successfully tune the interactions in a relatively compact hydrophobic core and the folding stability without inducing dramatic steric effects. Such an approach may be applied to other folded motifs or proteins.
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Affiliation(s)
- Wei-Lin Hsu
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, 30013, R.O.C
| | - Ting-Chia Shih
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, 30013, R.O.C
| | - Jia-Cherng Horng
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, 30013, R.O.C.,Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan, 30013, R.O.C
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67
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Abstract
On the basis of many literature measurements, a critical overview is given on essential noncovalent interactions in synthetic supramolecular complexes, accompanied by analyses with selected proteins. The methods, which can be applied to derive binding increments for single noncovalent interactions, start with the evaluation of consistency and additivity with a sufficiently large number of different host-guest complexes by applying linear free energy relations. Other strategies involve the use of double mutant cycles, of molecular balances, of dynamic combinatorial libraries, and of crystal structures. Promises and limitations of these strategies are discussed. Most of the analyses stem from solution studies, but a few also from gas phase. The empirically derived interactions are then presented on the basis of selected complexes with respect to ion pairing, hydrogen bonding, electrostatic contributions, halogen bonding, π-π-stacking, dispersive forces, cation-π and anion-π interactions, and contributions from the hydrophobic effect. Cooperativity in host-guest complexes as well as in self-assembly, and entropy factors are briefly highlighted. Tables with typical values for single noncovalent free energies and polarity parameters are in the Supporting Information.
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Affiliation(s)
- Frank Biedermann
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Hans-Jörg Schneider
- FR Organische Chemie der Universität des Saarlandes , D-66041 Saarbrücken, Germany
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68
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He B, Nie H, Luo W, Hu R, Qin A, Zhao Z, Tang BZ. Synthesis, structure and optical properties of tetraphenylethene derivatives with through-space conjugation between benzene and various planar chromophores. Org Chem Front 2016. [DOI: 10.1039/c6qo00204h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of tetraphenylethene derivatives with through-space conjugation and aggregation-enhanced emission properties are synthesized and studied.
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Affiliation(s)
- Bairong He
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Han Nie
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Wenwen Luo
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Rongrong Hu
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Anjun Qin
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Ben Zhong Tang
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
- Department of Chemistry
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69
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Landeros-Rivera B, Moreno-Esparza R, Hernández-Trujillo J. Theoretical study of intermolecular interactions in crystalline arene–perhaloarene adducts in terms of the electron density. RSC Adv 2016. [DOI: 10.1039/c6ra14957j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The intermolecular interactions in C6X6–arene crystals (X = F, Cl) and the halogen substitution effect can be quantified by the electron density.
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70
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Dou JH, Zheng YQ, Yao ZF, Lei T, Shen X, Luo XY, Yu ZA, Zhang SD, Han G, Wang Z, Yi Y, Wang JY, Pei J. A Cofacially Stacked Electron-Deficient Small Molecule with a High Electron Mobility of over 10 cm(2) V(-1) s(-1) in Air. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:8051-8055. [PMID: 26501491 DOI: 10.1002/adma.201503803] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 09/15/2015] [Indexed: 06/05/2023]
Abstract
A strong, electron-deficient small molecule, F4 -BDOPV, has a lowest unoccupied molecular orbital (LUMO) level down to -4.44 eV and exhibits cofacial packing in single crystals. These features provide F4 -BDOPV with good ambient stability and large charge-transfer integrals for electrons, leading to a high electron mobility of up to 12.6 cm(2) V(-1) s(-1) in air.
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Affiliation(s)
- Jin-Hu Dou
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Yu-Qing Zheng
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Ze-Fan Yao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Ting Lei
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Xingxing Shen
- Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xu-Yi Luo
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Zhi-Ao Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Shi-Ding Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Guangchao Han
- Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Zhi Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Yuanping Yi
- Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Jie-Yu Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Jian Pei
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
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71
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Dou JH, Zheng YQ, Yao ZF, Yu ZA, Lei T, Shen X, Luo XY, Sun J, Zhang SD, Ding YF, Han G, Yi Y, Wang JY, Pei J. Fine-Tuning of Crystal Packing and Charge Transport Properties of BDOPV Derivatives through Fluorine Substitution. J Am Chem Soc 2015; 137:15947-56. [DOI: 10.1021/jacs.5b11114] [Citation(s) in RCA: 184] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jin-Hu Dou
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yu-Qing Zheng
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ze-Fan Yao
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhi-Ao Yu
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ting Lei
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xingxing Shen
- Key
Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xu-Yi Luo
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Junliang Sun
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Shi-Ding Zhang
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi-Fan Ding
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Guangchao Han
- Key
Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yuanping Yi
- Key
Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jie-Yu Wang
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jian Pei
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of the Ministry
of Education, Center of Soft Matter Science and Engineering, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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72
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Madhusudan Makwana K, Mahalakshmi R. Implications of aromatic-aromatic interactions: From protein structures to peptide models. Protein Sci 2015; 24:1920-33. [PMID: 26402741 DOI: 10.1002/pro.2814] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 09/17/2015] [Accepted: 09/18/2015] [Indexed: 12/11/2022]
Abstract
With increasing structural information on proteins, the opportunity to understand physical forces governing protein folding is also expanding. One of the significant non-covalent forces between the protein side chains is aromatic-aromatic interactions. Aromatic interactions have been widely exploited and thoroughly investigated in the context of folding, stability, molecular recognition, and self-assembly processes. Through this review, we discuss the contribution of aromatic interactions to the activity and stability of thermophilic, mesophilic, and psychrophilic proteins. Being hydrophobic, aromatic amino acids tend to reside in the protein hydrophobic interior or transmembrane segments of proteins. In such positions, it can play a diverse role in soluble and membrane proteins, and in α-helix and β-sheet stabilization. We also highlight here some excellent investigations made using peptide models and several approaches involving aryl-aryl interactions, as an increasingly popular strategy in protein and peptide engineering. A recent survey described the existence of aromatic clusters (trimer, tetramer, pentamer, and higher order assemblies), revealing the self-associating property of aryl groups, even in folded protein structures. The application of this self-assembly of aromatics in the generation of modern bionanomaterials is also discussed.
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Affiliation(s)
- Kamlesh Madhusudan Makwana
- Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462023, India
| | - Radhakrishnan Mahalakshmi
- Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462023, India
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73
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Wu X, Zhao Y, Ge H. Pyridine-enabled copper-promoted cross dehydrogenative coupling of C(sp 2)-H and unactivated C(sp 3)-H bonds. Chem Sci 2015; 6:5978-5983. [PMID: 29861919 PMCID: PMC5950755 DOI: 10.1039/c5sc02143j] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Accepted: 07/20/2015] [Indexed: 12/20/2022] Open
Abstract
The pyridine-enabled cross dehydrogenative coupling of sp2 C-H bonds of polyfluoroarenes and unactivated sp3 C-H bonds of amides was achieved via a copper-promoted process with good functional group compatibility. This reaction showed great site-selectivity by favoring the sp2 C-H bonds ortho to two fluoro atoms of arenes and the sp3 C-H bonds of α-methyl groups over those of the α-methylene, β- or γ-methyl groups of the aliphatic amides. Mechanistic studies revealed that sp3 C-H bond cleavage is an irreversible but not the rate-determining step, and the sp2 C-H functionalization of arenes appears precedent to the sp3 C-H functionalization of amides in this process.
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Affiliation(s)
- Xuesong Wu
- Department of Chemistry and Chemical Biology , Indiana University-Purdue University Indianapolis , Indianapolis , Indiana 46202 , USA .
| | - Yan Zhao
- Department of Chemistry and Chemical Biology , Indiana University-Purdue University Indianapolis , Indianapolis , Indiana 46202 , USA .
| | - Haibo Ge
- Department of Chemistry and Chemical Biology , Indiana University-Purdue University Indianapolis , Indianapolis , Indiana 46202 , USA .
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74
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Holligan K, Rogler P, Rehe D, Pamula M, Kornienko AY, Emge TJ, Krogh-Jespersen K, Brennan JG. Copper, Indium, Tin, and Lead Complexes with Fluorinated Selenolate Ligands: Precursors to MSex. Inorg Chem 2015; 54:8896-904. [DOI: 10.1021/acs.inorgchem.5b00452] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kareem Holligan
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Patrick Rogler
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - David Rehe
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Michael Pamula
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Anna Y. Kornienko
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Thomas J. Emge
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Karsten Krogh-Jespersen
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - John G. Brennan
- Department
of Chemistry and
Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
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75
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He T, Gershenson A, Eyles SJ, Lee YJ, Liu WR, Wang J, Gao J, Roberts MF. Fluorinated Aromatic Amino Acids Distinguish Cation-π Interactions from Membrane Insertion. J Biol Chem 2015; 290:19334-42. [PMID: 26092728 DOI: 10.1074/jbc.m115.668343] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Indexed: 01/02/2023] Open
Abstract
Cation-π interactions, where protein aromatic residues supply π systems while a positive-charged portion of phospholipid head groups are the cations, have been suggested as important binding modes for peripheral membrane proteins. However, aromatic amino acids can also insert into membranes and hydrophobically interact with lipid tails. Heretofore there has been no facile way to differentiate these two types of interactions. We show that specific incorporation of fluorinated amino acids into proteins can experimentally distinguish cation-π interactions from membrane insertion of the aromatic side chains. Fluorinated aromatic amino acids destabilize the cation-π interactions by altering electrostatics of the aromatic ring, whereas their increased hydrophobicity enhances membrane insertion. Incorporation of pentafluorophenylalanine or difluorotyrosine into a Staphylococcus aureus phosphatidylinositol-specific phospholipase C variant engineered to contain a specific PC-binding site demonstrates the effectiveness of this methodology. Applying this methodology to the plethora of tyrosine residues in Bacillus thuringiensis phosphatidylinositol-specific phospholipase C definitively identifies those involved in cation-π interactions with phosphatidylcholine. This powerful method can easily be used to determine the roles of aromatic residues in other peripheral membrane proteins and in integral membrane proteins.
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Affiliation(s)
- Tao He
- From the Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467
| | - Anne Gershenson
- Department of Biochemistry and Molecular Biology, University of Massachusetts Amherst, Amherst, Massachusetts 01003
| | - Stephen J Eyles
- Department of Biochemistry and Molecular Biology, University of Massachusetts Amherst, Amherst, Massachusetts 01003
| | - Yan-Jiun Lee
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and
| | - Wenshe R Liu
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, and
| | - Jiangyun Wang
- Institute of Biophysics, Chinese Academy of Sciences, Chaoyang District, Beijing 100101, China
| | - Jianmin Gao
- From the Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467
| | - Mary F Roberts
- From the Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467,
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76
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Zhou Y, Ye H, You L. Reactivity-based dynamic covalent chemistry: reversible binding and chirality discrimination of monoalcohols. J Org Chem 2015; 80:2627-33. [PMID: 25674707 DOI: 10.1021/jo502801g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In an effort to develop reactivity-based dynamic covalent bonding and to expand the scope and application of the dynamic covalent chemistry, in situ-generated simple generic iminium ions were utilized for the dynamic covalent binding of monoalcohols with high affinity. Hammett analysis was conducted to manipulate the equilibrium and correlate with the reactivity of reactants. The structural features of aldehydes and secondary amines were identified, and both polar and steric effects have significant impact on the binding. In particular, the substrates which can participate in π-π and polar-π interactions are able to afford apparent equilibrium constants in the magnitude of 10(4) M(-2), demonstrating the power of weak supramolecular forces to stabilize the dynamic covalent assembly. The generality of the assembly was validated with a series of mono secondary alcohols. To showcase the practicality of our system, chirality discrimination and ee measurement of chiral secondary alcohols were achieved.
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Affiliation(s)
- Yuntao Zhou
- State Key Laboratory of Structural Chemistry, Fujian, Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fujian 350002, P. R. China
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77
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Podewin T, Rampp MS, Turkanovic I, Karaghiosoff KL, Zinth W, Hoffmann-Röder A. Photocontrolled chignolin-derived β-hairpin peptidomimetics. Chem Commun (Camb) 2015; 51:4001-4. [DOI: 10.1039/c4cc10304a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of novel, chignolin-derived peptides comprising the azobenzene photoswitch [3-(3-aminomethyl)phenylazo]phenylacetic acid (AMPP) is reported.
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Affiliation(s)
- T. Podewin
- Department of Organic Chemistry
- Faculty of Chemistry and Pharmacy
- Ludwig-Maximilians-University LMU
- 81377 Munich
- Germany
| | - M. S. Rampp
- Department for BioMolecular Optics
- Faculty of Physics
- Ludwig-Maximilians-University LMU
- 80538 Munich
- Germany
| | - I. Turkanovic
- Department for BioMolecular Optics
- Faculty of Physics
- Ludwig-Maximilians-University LMU
- 80538 Munich
- Germany
| | - K. L. Karaghiosoff
- Department of Organic Chemistry
- Faculty of Chemistry and Pharmacy
- Ludwig-Maximilians-University LMU
- 81377 Munich
- Germany
| | - W. Zinth
- Department for BioMolecular Optics
- Faculty of Physics
- Ludwig-Maximilians-University LMU
- 80538 Munich
- Germany
| | - A. Hoffmann-Röder
- Department of Organic Chemistry
- Faculty of Chemistry and Pharmacy
- Ludwig-Maximilians-University LMU
- 81377 Munich
- Germany
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78
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Yang HB, Zhao YZ, Sang R, Wei Y, Shi M. Asymmetric Synthesis of Bioxindole-Substituted Hexahydrofuro[2,3-b]furansviaHydroquinine Anthraquinone-1,4-diyl Diether-Catalyzed Domino Annulation of Acylidenoxindoles/Isatins, Acylidenoxindoles and Allenoates. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400614] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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79
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Manimaran B, Vanitha A, Karthikeyan M, Ramakrishna B, Mobin SM. Self-Assembly of Selenium-Bridged Rhenium(I)-Based Metalla Rectangles: Synthesis, Characterization, and Molecular Recognition Studies. Organometallics 2014. [DOI: 10.1021/om400673f] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Bala. Manimaran
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
| | - A. Vanitha
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
| | - M. Karthikeyan
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
| | | | - Shaikh M. Mobin
- National Single Crystal X-ray
Diffraction Facility, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
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80
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81
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Liu L, Yang G, Geng Y, Wu Y, Su Z. Electron transport via phenyl–perfluorophenyl interaction in crystals of fluorine-substituted dibenzalacetones. RSC Adv 2014. [DOI: 10.1039/c4ra09323b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Although substitution with fluorine creates stability in organic electronic materials by altering the molecular crystal packing, the charge transport properties of the materials are significantly affected.
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Affiliation(s)
- Ling Liu
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun, China
| | - Guochun Yang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun, China
| | - Yun Geng
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun, China
| | - Yong Wu
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun, China
| | - Zhongmin Su
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun, China
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82
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Wang JL, Xu JS, Wang DY, Wang H, Li ZT, Zhang DW. Anti-parallel sheet structures of side-chain-free γ-, δ-, and ε-dipeptides stabilized by benzene–pentafluorobenzene stacking. CrystEngComm 2014. [DOI: 10.1039/c3ce42060d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Benzene–pentafluorobenzene stacking can guide ω-amino acid dipeptides to arrange in an anti-parallel manner.
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Affiliation(s)
- Ji-Liang Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Jia-Su Xu
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Dong-Yun Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Hui Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Zhan-Ting Li
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
| | - Dan-Wei Zhang
- Department of Chemistry
- Fudan University
- Shanghai 200433, China
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83
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Bang EK, Ward S, Gasparini G, Sakai N, Matile S. Cell-penetrating poly(disulfide)s: focus on substrate-initiated co-polymerization. Polym Chem 2014. [DOI: 10.1039/c3py01570j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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84
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Xu G, Fu W, Liu G, Senanayake CH, Tang W. Efficient Syntheses of Korupensamines A, B and Michellamine B by Asymmetric Suzuki-Miyaura Coupling Reactions. J Am Chem Soc 2013; 136:570-3. [DOI: 10.1021/ja409669r] [Citation(s) in RCA: 239] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Guangqing Xu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Wenzhen Fu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Guodu Liu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Chris H. Senanayake
- Chemical Development,
Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut CT06877, United States
| | - Wenjun Tang
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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