1
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He J, Bai M, Xiao X, Qiu S, Chen W, Li J, Yu Y, Tian W. Intramolecular Cation-π Interactions Organize Bowl-Shaped, Luminescent Molecular Containers. Angew Chem Int Ed Engl 2024; 63:e202402697. [PMID: 38433608 DOI: 10.1002/anie.202402697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 02/28/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
Molecules with nonplanar architectures are highly desirable due to their unique topological structures and functions. We report here the synthesis of two molecular containers (1 ⋅ 3Br- and 1 ⋅ 3Cl-), which utilize intramolecular cation-π interactions to enforce macrocylic arrangements and exhibit high binding affinity and luminescent properties. Remarkably, the geometry of the cation-π interaction can be flexibly tailored to achieve a precise ring arrangement, irrespective of the angle of the noncovalent bonds. Additionally, the C-H⋅⋅⋅Br- hydrogen bonds within the container are also conducive to stabilizing the bowl-shaped conformation. These bowl-shaped conformations were confirmed both in solution through NMR spectroscopy and in the solid state by X-ray studies. 1 ⋅ 3Br- shows high binding affinity and selectivity: F->Cl-, through C-H⋅⋅⋅X- (X=F, Cl) hydrogen bonds. Additionally, these containers exhibited blue fluorescence in solution and yellow room-temperature phosphorescence (RTP) in the solid state. Our findings illustrate the utility of cation-π interactions in designing functional molecules.
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Affiliation(s)
- Jia He
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Minggui Bai
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Xuedong Xiao
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Shuai Qiu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Wenzhuo Chen
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Jiaqi Li
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
| | - Yang Yu
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Science, Shanghai University, 99 Shang-Da Road, Shanghai, 200444, China
| | - Wei Tian
- Shaanxi Key Laboratory of Macromolecular Science and Technology, Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University., Xi'an, 710072, Shaanxi, P. R. China
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2
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Fan H, Guo H, Kurokawa T, Gong JP. Quantitative determination of cation–π interactions between metal ions and aromatic groups in aqueous media by a hydrogel Donnan potential method. Phys Chem Chem Phys 2022; 24:6126-6132. [DOI: 10.1039/d1cp05622k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The binding ratios of various metal ions to aromatic groups by cation–π interactions in aqueous media have been quantitatively calculated by using Donnan potential measurements.
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Affiliation(s)
- Hailong Fan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
| | - Honglei Guo
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
| | - Takayuki Kurokawa
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
| | - Jian Ping Gong
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan
- Faculty of Advanced Life Science, Hokkaido University, N21W11, Kita-ku, Sapporo 001-0021, Japan
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3
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Xiang L, Zhang J, Wang W, Gong L, Zhang L, Yan B, Zeng H. Nanomechanics of π-cation-π interaction with implications for bio-inspired wet adhesion. Acta Biomater 2020; 117:294-301. [PMID: 33007483 DOI: 10.1016/j.actbio.2020.09.043] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/18/2020] [Accepted: 09/22/2020] [Indexed: 12/14/2022]
Abstract
Cation-π interactions play a vital role in modulating various biological processes, e.g., potassium-selective channel, protein folding and adhesion of marine organism. Previous studies mainly focus on binary cation-π interaction, whereas due to the complexity of biological systems and surrounding environments, a single cation is often in close proximity with more than one π-conjugated unit, which could exhibit essentially different binding behavior. Herein, the first experimental evidence of ternary π-cation-π interaction is reported through direct nanomechanical force measurement in a model π-conjugated poly(catechol) (PC) system coexisting with K+. Ternary π-cation-π interactions can bridge π-conjugated moieties, resulting in robust adhesion and promoting PC assembly and deposition. Particularly, these ternary complexes are discovered to transit to binary binding pairs by increasing K+ concentration, undermining adhesion and assembly due to lack of bridging. The π-cation-π binding strength follows the trend of NMe4+ > K+ > Na+ > Li+. Employing the π-cation-π interaction, a deposition strategy to fabricate π-conjugated moiety based adhesive coatings on different substrates is realized. Our findings provide useful insights in engineering wet adhesives and coatings with reversible adhesion properties, and more broadly, with implications on rationalizing biological assembly.
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Affiliation(s)
- Li Xiang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Jiawen Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Wenda Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Lu Gong
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Ling Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Bin Yan
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada; College of Light Industry, Textile & Food Engineering, Sichuan University, Chengdu 610065, China
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
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4
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Zhang Z, Fan Z. Application of magnesium ion doped carbon dots obtained via hydrothermal synthesis for arginine detection. NEW J CHEM 2020. [DOI: 10.1039/c9nj06409e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As a new-type of nanomaterial, carbon dots (CDs) have been extensively applied in biochemistry-related fields.
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Affiliation(s)
- Ziting Zhang
- School of Chemistry and Materials Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Zhefeng Fan
- School of Chemistry and Materials Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
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5
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Affiliation(s)
- Shinji Yamada
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo 112-8610, Japan
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6
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Conformation of some 2,4,6-trisubstitued pyridinium salts. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Zhong J, Li Z, Guan W, Lu C. Cation−π Interaction Triggered-Fluorescence of Clay Fillers in Polymer Composites for Quantification of Three-Dimensional Macrodispersion. Anal Chem 2017; 89:12472-12479. [DOI: 10.1021/acs.analchem.7b03575] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jinpan Zhong
- State Key Laboratory of Chemical Resource
Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhiqiang Li
- State Key Laboratory of Chemical Resource
Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Weijiang Guan
- State Key Laboratory of Chemical Resource
Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Chao Lu
- State Key Laboratory of Chemical Resource
Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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8
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Azizi A, Ebrahimi A. Theoretical investigation of the π + -π + stacking interactions in substituted pyridinium ion. J Mol Graph Model 2017; 77:225-231. [DOI: 10.1016/j.jmgm.2017.08.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 08/27/2017] [Accepted: 08/31/2017] [Indexed: 11/16/2022]
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9
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Georgiou I, Kervyn S, Rossignon A, De Leo F, Wouters J, Bruylants G, Bonifazi D. Versatile Self-Adapting Boronic Acids for H-Bond Recognition: From Discrete to Polymeric Supramolecules. J Am Chem Soc 2017; 139:2710-2727. [PMID: 28051311 DOI: 10.1021/jacs.6b11362] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Because of the peculiar dynamic covalent reactivity of boronic acids to form tetraboronate derivatives, interest in using their aryl derivatives in materials science and supramolecular chemistry has risen. Nevertheless, their ability to form H-bonded complexes has been only marginally touched. Herein we report the first solution and solid-state binding studies of the first double-H-bonded DD·AA-type complexes of a series of aromatic boronic acids that adopt a syn-syn conformation with suitable complementary H-bonding acceptor partners. The first determination of the association constant (Ka) of ortho-substituted boronic acids in solution showed that Ka for 1:1 association is in the range between 300 and 6900 M-1. Crystallization of dimeric 1:1 and trimeric 1:2 and 2:1 complexes enabled an in-depth examination of these complexes in the solid state, proving the selection of the -B(OH)2 syn-syn conformer through a pair of frontal H-bonds with the relevant AA partner. Non-ortho-substituted boronic acids result in "flat" complexes. On the other hand, sterically demanding analogues bearing ortho substituents strive to retain their recognition properties by rotation of the ArB(OH)2 moiety, forming "T-shaped" complexes. Solid-state studies of a diboronic acid and a tetraazanaphthacene provided for the first time the formation of a supramolecular H-bonded polymeric ribbon. On the basis of the conformational dynamicity of the -B(OH)2 functional group, it is expected that these findings will also open new possibilities in metal-free catalysis or organic crystal engineering, where double-H-bonding donor boronic acids could act as suitable organocatalysts or templates for the development of functional materials with tailored organizational properties.
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Affiliation(s)
- Irene Georgiou
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium
| | - Simon Kervyn
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium
| | - Alexandre Rossignon
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium.,School of Chemistry, Cardiff University , Park Place, Main Building, Cardiff CF10 3AT, U.K
| | - Federica De Leo
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium
| | - Johan Wouters
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium
| | - Gilles Bruylants
- Université Libre de Bruxelles , Ecole Polytechnique de Bruxelles, Campus du Solbosch, Avenue F. D. Roosevelt 50, 1050 Bruxelles, Belgium
| | - Davide Bonifazi
- Department of Chemistry, University of Namur (UNamur) , Rue de Bruxelles 61, 5000 Namur, Belgium.,School of Chemistry, Cardiff University , Park Place, Main Building, Cardiff CF10 3AT, U.K
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10
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Novel methodology for the synthesis of the benzo[b]phenanthridine and 6H-dibenzo[c,h]chromen-6-one skeletons. Reactions of 2-naphthylbenzylamines and 2-naphthylbenzyl alcohols. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.10.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Yamada S, Yamamoto N, Takamori E. Synthesis of Molecular Seesaw Balances and the Evaluation of Pyridinium−π Interactions. J Org Chem 2016; 81:11819-11830. [DOI: 10.1021/acs.joc.6b02295] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shinji Yamada
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
| | - Natsuo Yamamoto
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
| | - Eri Takamori
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku,
Tokyo 112-8610, Japan
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12
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Sarmah N, Bhattacharyya PK. Behaviour of cation–pi interaction in presence of external electric field. RSC Adv 2016. [DOI: 10.1039/c6ra21334k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
External electric field effects cation–π interaction.
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Affiliation(s)
- Nabajit Sarmah
- Department of Chemistry
- Arya Vidyapeeth College
- Guwahati-781016
- India
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13
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Emenike BU, Bey SN, Spinelle RA, Jones JT, Yoo B, Zeller M. Cationic CH⋯π interactions as a function of solvation. Phys Chem Chem Phys 2016; 18:30940-30945. [DOI: 10.1039/c6cp06800f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The energy of a cationic CH⋯π interaction was measured as a function of solvation using molecular torsion balances.
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Affiliation(s)
- Bright U. Emenike
- Department of Chemistry & Physics
- State University of New York
- Old Westbury
- USA
| | - Sara N. Bey
- Department of Chemistry & Physics
- State University of New York
- Old Westbury
- USA
| | - Ronald A. Spinelle
- Department of Chemistry & Physics
- State University of New York
- Old Westbury
- USA
| | - Jacob T. Jones
- Department of Chemistry & Physics
- State University of New York
- Old Westbury
- USA
| | - Barney Yoo
- Department of Chemistry
- Hunter College
- City University of New York
- New York
- USA
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14
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Yamada S, Yamamoto N, Takamori E. A Molecular Seesaw Balance: Evaluation of Solvent and Counteranion Effects on Pyridinium−π Interactions. Org Lett 2015; 17:4862-5. [DOI: 10.1021/acs.orglett.5b02420] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Shinji Yamada
- Department of Chemistry,
Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan
| | - Natsuo Yamamoto
- Department of Chemistry,
Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan
| | - Eri Takamori
- Department of Chemistry,
Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan
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15
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Upregulation of BMSCs osteogenesis by positively-charged tertiary amines on polymeric implants via charge/iNOS signaling pathway. Sci Rep 2015; 5:9369. [PMID: 25791957 PMCID: PMC4366815 DOI: 10.1038/srep09369] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 03/02/2015] [Indexed: 12/18/2022] Open
Abstract
Positively-charged surfaces on implants have a similar potential to upregulate osteogenesis of bone marrow-derived mesenchymal stem cells (BMSCs) as electromagnetic therapy approved for bone regeneration. Generally, their osteogenesis functions are generally considered to stem from the charge-induced adhesion of extracellular matrix (ECM) proteins without exploring the underlying surface charge/cell signaling molecule pathways. Herein, a positively-charged surface with controllable tertiary amines is produced on a polymer implant by plasma surface modification. In addition to inhibiting the TNF-α expression, the positively-charged surface with tertiary amines exhibits excellent cytocompatibility as well as remarkably upregulated osteogenesis-related gene/protein expressions and calcification of the contacted BMSCs. Stimulated by the charged surface, these BMSCs display high iNOS expressions among the three NOS isoforms. Meanwhile, downregulation of the iNOS by L-Can or siRNA inhibit osteogenic differentiation in the BMSCs. These findings suggest that a positively-charged surface with tertiary amines induces osteogenesis of BMSCs via the surface charge/iNOS signaling pathway in addition to elevated ECM protein adhesion. Therefore, creating a positively-charged surface with tertiary amines is a promising approach to promote osseointegration with bone tissues.
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16
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Adam C, Yang L, Cockroft SL. Partitioning Solvophobic and Dispersion Forces in Alkyl and Perfluoroalkyl Cohesion. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408982] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Adam C, Yang L, Cockroft SL. Partitioning Solvophobic and Dispersion Forces in Alkyl and Perfluoroalkyl Cohesion. Angew Chem Int Ed Engl 2014; 54:1164-7. [DOI: 10.1002/anie.201408982] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Indexed: 11/07/2022]
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18
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Li P, Zhao C, Smith MD, Shimizu KD. Comprehensive Experimental Study of N-Heterocyclic π-Stacking Interactions of Neutral and Cationic Pyridines. J Org Chem 2013; 78:5303-13. [DOI: 10.1021/jo400370e] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ping Li
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina
29208, United States
| | - Chen Zhao
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina
29208, United States
| | - Mark D. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina
29208, United States
| | - Ken D. Shimizu
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina
29208, United States
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19
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Hassan A, Dinadayalane TC, Grabowski SJ, Leszczynski J. Structural, energetic, spectroscopic and QTAIM analyses of cation–π interactions involving mono- and bi-cyclic ring fused benzene systems. Phys Chem Chem Phys 2013; 15:20839-56. [PMID: 24196371 DOI: 10.1039/c3cp53927j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Ayorinde Hassan
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry and Biochemistry, Jackson State University, 1400 J.R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA.
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20
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Mahadevi AS, Sastry GN. Cation-π interaction: its role and relevance in chemistry, biology, and material science. Chem Rev 2012; 113:2100-38. [PMID: 23145968 DOI: 10.1021/cr300222d] [Citation(s) in RCA: 731] [Impact Index Per Article: 60.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- A Subha Mahadevi
- Molecular Modeling Group, CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 607, Andhra Pradesh, India
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21
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Ren HB, Yan XP. Ultrasonic assisted synthesis of adenosine triphosphate capped manganese-doped ZnS quantum dots for selective room temperature phosphorescence detection of arginine and methylated arginine in urine based on supramolecular Mg(2+)-adenosine triphosphate-arginine ternary system. Talanta 2012; 97:16-22. [PMID: 22841042 DOI: 10.1016/j.talanta.2012.03.055] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 03/21/2012] [Accepted: 03/21/2012] [Indexed: 10/28/2022]
Abstract
An ultrasonic assisted approach was developed for rapid synthesis of highly water soluble phosphorescent adenosine triphosphate (ATP)-capped Mn-doped ZnS QDs. The prepared ATP-capped Mn-doped ZnS QDs allow selective phosphorescent detection of arginine and methylated arginine based on the specific recognition nature of supramolecular Mg(2+)-ATP-arginine ternary system in combination with the phosphorescence property of Mn-doped ZnS QDs. The developed QD based probe gives excellent selectivity and reproducibility (1.7% relative standard deviation for 11 replicate detections of 10 μM arginine) and low detection limit (3 s, 0.23 μM), and favors biological applications due to the effective elimination of interference from scattering light and autofluorescence.
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Affiliation(s)
- Hu-Bo Ren
- State Key Laboratory of Medicinal Chemical Biology, and Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China
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22
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Tao X, Li W, Ma X, Li X, Fan W, Xie X, Ayad T, Ratovelomanana-Vidal V, Zhang Z. Ruthenium-Catalyzed Enantioselective Hydrogenation of Aryl-Pyridyl Ketones. J Org Chem 2011; 77:612-6. [DOI: 10.1021/jo202204j] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoming Tao
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Wanfang Li
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xin Ma
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xiaoming Li
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Weizheng Fan
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xiaomin Xie
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Tahar Ayad
- ENSCP Chimie ParisTech,
Laboratoire
Charles Friedel (LCF), CNRS, UMR 7223, 75005 Paris, France
| | | | - Zhaoguo Zhang
- School of Chemistry
and Chemical
Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
- Shanghai Institute of Organic Chemistry, 345 Lingling Road, Shanghai 200032,
China
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23
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Ren Y, Kan WH, Henderson MA, Bomben PG, Berlinguette CP, Thangadurai V, Baumgartner T. External-Stimuli Responsive Photophysics and Liquid Crystal Properties of Self-Assembled “Phosphole-Lipids”. J Am Chem Soc 2011; 133:17014-26. [DOI: 10.1021/ja206784f] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yi Ren
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Wang Hay Kan
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Matthew A. Henderson
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Paolo G. Bomben
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Curtis P. Berlinguette
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Venkataraman Thangadurai
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Thomas Baumgartner
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
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Giordano L, Hoang CT, Shipman M, Tucker JHR, Walsh TR. Aziridine Scaffolds for the Detection and Quantification of Hydrogen-Bonding Interactions through Transition-State Stabilization. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Giordano L, Hoang CT, Shipman M, Tucker JHR, Walsh TR. Aziridine scaffolds for the detection and quantification of hydrogen-bonding interactions through transition-state stabilization. Angew Chem Int Ed Engl 2011; 50:741-4. [PMID: 21226167 DOI: 10.1002/anie.201005580] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 10/26/2010] [Indexed: 11/05/2022]
Affiliation(s)
- Luciana Giordano
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT UK
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26
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Geronimo I, Jiten Singh N, Kim KS. Nature of anion-templated π+–π+ interactions. Phys Chem Chem Phys 2011; 13:11841-5. [DOI: 10.1039/c1cp20348g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Mu HL, Ye WP, Song DP, Li YS. Highly Active Single-Component Neutral Nickel Ethylene Polymerization Catalysts: The Influence of Electronic Effects and Spectator Ligands. Organometallics 2010. [DOI: 10.1021/om100658j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Hong-Liang Mu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- Graduate School of the Chinese Academy of Sciences, Changchun Branch, People's Republic of China
| | - Wei-Ping Ye
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Dong-Po Song
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- Graduate School of the Chinese Academy of Sciences, Changchun Branch, People's Republic of China
| | - Yue-Sheng Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
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28
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Raifman O, Kolusheva S, El Kazzouli S, Sigano DM, Kedei N, Lewin NE, Lopez-Nicolas R, Ortiz-Espin A, Gomez-Fernandez JC, Blumberg PM, Marquez VE, Corbalan-Garcia S, Jelinek R. Membrane-surface anchoring of charged diacylglycerol-lactones correlates with biological activities. Chembiochem 2010; 11:2003-9. [PMID: 20715268 PMCID: PMC3729217 DOI: 10.1002/cbic.201000343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Indexed: 12/21/2022]
Abstract
Synthetic diacylglycerol-lactones (DAG-lactones) are effective modulators of critical cellular signaling pathways, downstream of the lipophilic second messenger diacylglycerol, that activate a host of protein kinase C (PKC) isozymes and other nonkinase proteins that share similar C1 membrane-targeting domains with PKC. A fundamental determinant of the biological activity of these amphiphilic molecules is the nature of their interactions with cellular membranes. This study examines the biological properties of charged DAG-lactones exhibiting different alkyl groups attached to the heterocyclic nitrogen of an α-pyridylalkylidene chain, and particularly the relationship between membrane interactions of the substituted DAG-lactones and their respective biological activities. Our results suggest that bilayer interface localization of the N-alkyl chain in the R(2) position of the DAG-lactones inhibits translocation of PKC isoenzymes onto the cellular membrane. However, the orientation of a branched alkyl chain at the bilayer surface facilitates PKC binding and translocation. This investigation emphasizes that bilayer localization of the aromatic side residues of positively charged DAG-lactone derivatives play a central role in determining biological activity, and that this factor contributes to the diversity of biological actions of these synthetic biomimetic ligands.
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Affiliation(s)
- Or Raifman
- Department of Chemistry, Ben Gurion University, Beer Sheva 84105, Israel
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29
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Mati IK, Cockroft SL. Molecular balances for quantifying non-covalent interactions. Chem Soc Rev 2010; 39:4195-205. [PMID: 20844782 DOI: 10.1039/b822665m] [Citation(s) in RCA: 175] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular interactions underlie the whole of chemistry and biology. This tutorial review illustrates the use of rotameric folding molecules, topoisomers, atropoisomers, and tautomers as molecular balances for quantifying non-covalent interactions. This intramolecular approach enables a wide variety of interactions to be examined with a degree of geometric control that is difficult to achieve in supramolecular complexes. Synthetic variation of molecular balances allows the fundamental physicochemical origins of molecular recognition to be systematically examined by providing insights into the interplay of geometry and solvation on non-covalent interactions.
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Affiliation(s)
- Ioulia K Mati
- School of Chemistry, University of Edinburgh, King's Buildings, West Mains Road, Edinburgh, UK EH9 3JJ
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30
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SmI2/H2O/amine promoted reductive cleavage of benzyl-heteroatom bonds: optimization and mechanism. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.086] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
Supramolecular chemistry has expanded dramatically in recent years both in terms of potential applications and in its relevance to analogous biological systems. The formation and function of supramolecular complexes occur through a multiplicity of often difficult to differentiate noncovalent forces. The aim of this Review is to describe the crucial interaction mechanisms in context, and thus classify the entire subject. In most cases, organic host-guest complexes have been selected as examples, but biologically relevant problems are also considered. An understanding and quantification of intermolecular interactions is of importance both for the rational planning of new supramolecular systems, including intelligent materials, as well as for developing new biologically active agents.
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Affiliation(s)
- Hans-Jörg Schneider
- Organische Chemie, Universität des Saarlandes, 66041 Saarbrücken, Deutschland.
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Rao JS, Zipse H, Sastry GN. Explicit Solvent Effect on Cation−π Interactions: A First Principle Investigation. J Phys Chem B 2009; 113:7225-36. [DOI: 10.1021/jp900013e] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- J. Srinivasa Rao
- Molecular Modeling Group, Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500 607, India, and Department Chemie and Biochemie, LMU München, Butenandtstrasse 5-13, D-81377, München, Germany
| | - Hendrik Zipse
- Molecular Modeling Group, Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500 607, India, and Department Chemie and Biochemie, LMU München, Butenandtstrasse 5-13, D-81377, München, Germany
| | - G. Narahari Sastry
- Molecular Modeling Group, Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500 607, India, and Department Chemie and Biochemie, LMU München, Butenandtstrasse 5-13, D-81377, München, Germany
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34
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Purse BW, Butterfield SM, Ballester P, Shivanyuk A, Rebek J. Interaction energies and dynamics of acid-base pairs isolated in cavitands. J Org Chem 2008; 73:6480-8. [PMID: 18672933 DOI: 10.1021/jo8008534] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of capsules and cavitands in physical organic chemistry is briefly reviewed, and their application to the study of salt bridges is introduced. Carboxylate/ammonium ion pairs are generated within an environment that more or less surrounds the functional groups within a synthetic fixed introverted solvent sphere. This is provided by cavitands that fold around amines and present them with a carboxylic acid function. Both organic and water-soluble versions were prepared, and their equilibrium affinities with quinuclidine bases were determined by NMR methods. The association constants range from approximately 10(3) M(-1) in water to more than 10(5) M(-1) in organic solvents. Studies of nitrogen inversion and tumbling of [2.2.2]-diazabicyclooctane within the introverted acids also illustrate the strength of the acid-base interactions. The barriers to in-out exchange of several amine guests were determined to be in the range from 15 to 24 kcal mol(-1). Some parallels with enzymes are drawn: the receptor folds around the guest species; presents them with inwardly directed functionality; and provides a generally hydrophobic environment and a periphery of secondary amide bonds.
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Affiliation(s)
- Byron W Purse
- The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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35
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Katz CE, Ribelin T, Withrow D, Basseri Y, Manukyan AK, Bermudez A, Nuera CG, Day VW, Powell DR, Poutsma JL, Aubé J. Nonbonded, Attractive Cation−π Interactions in Azide-Mediated Asymmetric Ring Expansion Reactions. J Org Chem 2008; 73:3318-27. [DOI: 10.1021/jo800222r] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Christopher E. Katz
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Timothy Ribelin
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Donna Withrow
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Yashar Basseri
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Anna K. Manukyan
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Amy Bermudez
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Christian G Nuera
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Douglas R. Powell
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Jennifer L. Poutsma
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
| | - Jeffrey Aubé
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 2010, Malott Hall, Lawrence, Kansas 66045-7582, Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Room 4070, Malott Hall, Lawrence, Kansas 66045-7582, and Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529
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36
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Richter I, Minari J, Axe P, Lowe JP, James TD, Sakurai K, Bull SD, Fossey JS. Intramolecular cation–π interactions control the conformation of nonrestricted (phenylalkyl)pyridines. Chem Commun (Camb) 2008:1082-4. [DOI: 10.1039/b716937j] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Wang X, Sarycheva OV, Koivisto BD, McKie AH, Hof F. A terphenyl scaffold for pi-stacked guanidinium recognition elements. Org Lett 2007; 10:297-300. [PMID: 18092794 DOI: 10.1021/ol7027042] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new synthetic model of arginine-carboxylate-aromatic triads-common motifs at sites of protein-protein interactions-is reported. Binding studies in mixed methanol/water solvent systems suggest that the carboxylate-binding ability of pi-stacked guanidinium ions is improved relative to a non-stacked control.
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Affiliation(s)
- Xing Wang
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC, V8W 3V6 Canada
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38
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Ma Y, Lu G. Differential effects of Mg(ii) and N(alpha)-4-tosyl-l-arginine methyl ester hydrochloride on the recognition and catalysis in ATP hydrolysis. Dalton Trans 2007:1081-6. [PMID: 18274689 DOI: 10.1039/b714667a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The supramolecular interactions of Mg(ii) and N(alpha)-4-tosyl-l-arginine methyl ester hydrochloride (TAME) with ATP have been investigated using (1)H and (31)P NMR spectra. Furthermore, the hydrolysis of ATP catalyzed by Mg(ii) and TAME has been studied at 60 degrees C and pH 7 using (31)P NMR spectra. In the Mg(ii)-ATP-TAME ternary system, the binding interaction of Mg(2+) with ATP involves not only N1 and N7 in the adenine ring but also beta- and gamma-phosphate of ATP. The binding forces are mainly electrostatic interaction and cation (Mg(2+))-pi interaction. The guanidinium group and the aromatic ring of TAME interacts with ATP by beta and gamma phosphate and the adenine ring of ATP. The binding forces are mainly electrostatic interactions and pi-pi stacking. A significant difference between the binary and the ternary system indicates that TAME is essential to the stablization of the intermediate. Kinetic studies show that the hydrolysis rate constant of ATP is 2.16 x 10(-2) h(-1) at pH 7 in the Mg(ii)-TAME-ATP ternary system. The Mg(ii) ion and TAME can accelerate the ATP hydrolysis process. A possible mechanism has been proposed that the hydrolysis occurs through an addition-elimination, in which the phosphoramidate intermediate was observed at 3.21 ppm in the (31)P NMR of the ternary system. These results provide further information concerning the effect of the key amino acid residue and metal ions as cofactors of ATPase on ATP synthesis/hydrolysis at the molecular level.
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Affiliation(s)
- Yanqing Ma
- Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
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39
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40
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Abstract
An adaptive tetrazole-derived host provides insight into tetrazolate-biomolecule interactions, and is the first member of a new family of receptors that function in pure water.
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Affiliation(s)
- Devin J Mahnke
- Department of Chemistry, University of Victoria, Victoria, Canada
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41
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Park CM, Oie T, Petros AM, Zhang H, Nimmer PM, Henry RF, Elmore SW. Design, Synthesis, and Computational Studies of Inhibitors of Bcl-XL. J Am Chem Soc 2006; 128:16206-12. [PMID: 17165773 DOI: 10.1021/ja0650347] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
One of the primary objectives in the design of protein inhibitors is to shape the three-dimensional structures of small molecules to be complementary to the binding site of a target protein. In the course of our efforts to discover potent inhibitors of Bcl-2 family proteins, we found a unique folded conformation adopted by tethered aromatic groups in the ligand that significantly enhanced binding affinity to Bcl-XL. This finding led us to design compounds that were biased by nonbonding interactions present in a urea tether to adopt this bioactive, folded motif. To characterize the key interactions that induce the desired conformational bias, a series of substituted N,N'-diarylureas were prepared and analyzed using X-ray crystallography and quantum mechanical calculations. Stabilizing pi-stacking interactions and destabilizing steric interactions were predicted to work in concert in two of the substitution patterns to promote the bioactive conformation as a global energy minimum and result in a high target binding affinity. Conversely, intramolecular hydrogen bonding present in the third substitution motif promotes a less active, extended conformer as the energetically favored geometry. These findings were corroborated when the inhibition constant of binding to Bcl-XL was determined for fully elaborated analogues bearing these structural motifs. Finally, we obtained the NMR solution structure of the disubstituted N,N'-diarylurea bound to Bcl-XL demonstrating the folded conformation of the urea motif engaged in extensive pi-interactions with the protein.
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Affiliation(s)
- Cheol-Min Park
- Contribution from Global Pharmaceutical R&D, Abbott Laboratories, Abbott Park, Illinois 60064, USA.
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42
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Abdelhamid RF, Obara Y, Uchida Y, Kohzuma T, Dooley DM, Brown DE, Hori H. π–π interaction between aromatic ring and copper-coordinated His81 imidazole regulates the blue copper active-site structure. J Biol Inorg Chem 2006; 12:165-73. [PMID: 17031705 DOI: 10.1007/s00775-006-0176-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Accepted: 09/07/2006] [Indexed: 10/24/2022]
Abstract
Noncovalent weak interactions play important roles in biological systems. In particular, such interactions in the second coordination shell of metal ions in proteins may modulate the structure and reactivity of the metal ion site in functionally significant ways. Recently, pi-pi interactions between metal ion coordinated histidine imidazoles and aromatic amino acids have been recognized as potentially important contributors to the properties of metal ion sites. In this paper we demonstrate that in pseudoazurin (a blue copper protein) the pi-pi interaction between a coordinated histidine imidazole ring and the side chains of aromatic amino acids in the second coordination sphere, significantly influences the properties of the blue copper site. Electronic absorption and electron paramagnetic resonance spectra indicate that the blue copper electronic structure is perturbed, as is the redox potential, by the introduction of a second coordination shell pi-pi interaction. We suggest that the pi-pi interaction with the metal ion coordinated histidine imidazole ring modulates the electron delocalization in the active site, and that such interactions may be functionally important in refining the reactivity of blue copper sites.
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Affiliation(s)
- Rehab F Abdelhamid
- Institute of Applied Beam Science, Ibaraki University, Mito, Ibaraki, 310-8512, Japan
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Yamada S, Morimoto Y, Misono T. Preference of intra- and intermolecular cation–π interaction: cis–trans geometrical effects of amide bond on the interaction mode. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.06.088] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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