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Manha Veedu R, Niemeyer N, Bäumer N, Kartha Kalathil K, Neugebauer J, Fernández G. Sterically Allowed H-type Supramolecular Polymerizations. Angew Chem Int Ed Engl 2023; 62:e202314211. [PMID: 37797248 DOI: 10.1002/anie.202314211] [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: 09/22/2023] [Revised: 10/05/2023] [Accepted: 10/05/2023] [Indexed: 10/07/2023]
Abstract
The functionalization of π-conjugated scaffolds with sterically demanding substituents is a widely used tactic to suppress cofacial (H-type) stacking interactions, which may even inhibit self-assembly. Contrary to expectations, we demonstrate herein that increasing steric effects can result in an enhanced thermodynamic stability of H-type supramolecular polymers. In our approach, we have investigated two boron dipyrromethene (BODIPY) dyes with bulky phenyl (2) and mesityl (3) meso-substituents and compared their self-assembly in nonpolar media with that of a parent meso-methyl BODIPY 1 lacking bulky groups. While the enhanced steric demand induces pathway complexity, the superior thermodynamic stability of the H-type pathways can be rationalized in terms of additional enthalpic gain arising from intermolecular C-H⋅⋅⋅F-B interactions of the orthogonally arranged aromatic substituents, which overrule their inherent steric demand. Our findings underline the importance of balancing competing non-covalent interactions in self-assembly.
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Affiliation(s)
- Rasitha Manha Veedu
- Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany
| | - Niklas Niemeyer
- Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany
- Universität Münster, Center for Multiscale Theory and Computation, Corrensstraße 36, 48149, Münster, Germany
| | - Nils Bäumer
- Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany
| | - Krishnan Kartha Kalathil
- School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills, Kottayam, Kerala-686560, India
| | - Johannes Neugebauer
- Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany
- Universität Münster, Center for Multiscale Theory and Computation, Corrensstraße 36, 48149, Münster, Germany
| | - Gustavo Fernández
- Universität Münster, Organisch-Chemisches Institut, Corrensstraße 36, 48149, Münster, Germany
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Qi Z, Gao D, Zhu Z, He Z, Bai G. Regulating Optical Properties of Water-Soluble Conjugated Polythiophene with Polyvinyl Alcohol. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a22010013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Wang J, Yang X, Zhao P, Deng H, Zhuo LG, Wang G, Yang Y, Wei H, Zhou Z, Liao W. Investigating Antibacterial Efficiency and Mechanism of Oligo-thiophenes under White Light and Specific Biocidal Activity against E. coli in Dark. ACS APPLIED BIO MATERIALS 2021; 4:3561-3570. [DOI: 10.1021/acsabm.1c00077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jing Wang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Xia Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Peng Zhao
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
| | - Hao Deng
- Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, People’s Republic of China
| | - Lian-Gang Zhuo
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Guanquan Wang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Yuchuan Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Collaborative Innovation Center of Radiation Medicine of Jiangsu, Higher Education Institutions, Suzhou, Sichuan 215123, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Hongyuan Wei
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Collaborative Innovation Center of Radiation Medicine of Jiangsu, Higher Education Institutions, Suzhou, Sichuan 215123, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
| | - Zhijun Zhou
- Collaborative Innovation Center of Radiation Medicine of Jiangsu, Higher Education Institutions, Suzhou, Sichuan 215123, People’s Republic of China
| | - Wei Liao
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 64 Mianshan Road, Mianyang, Sichuan 621900, People’s Republic of China
- Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang, Sichuan 621900, People’s Republic of China
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4
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Well-Defined Conjugated Macromolecules Based on Oligo(Arylene Ethynylene)s in Sensing. Processes (Basel) 2020. [DOI: 10.3390/pr8050539] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Macromolecules with well-defined structures in terms of molar mass and monomer sequence became interesting building blocks for modern materials. The precision of the macromolecular structure makes fine-tuning of the properties of resulting materials possible. Conjugated macromolecules exhibit excellent optoelectronic properties that make them exceptional candidates for sensor construction. The importance of chain length and monomer sequence is particularly important in conjugated systems. The oligomer length, monomer sequence, and structural modification often influence the energy bang gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the molecules that reflect in their properties. Moreover, the supramolecular aggregation that is often observed in oligo-conjugated systems is usually strongly affected by even minor structural changes that are used for sensor designs. This review discusses the examples of well-defined conjugated macromolecules based on oligo(arylene ethynylene) skeleton used for sensor applications. Here, exclusively examples of uniform macromolecules are summarized. The sensing mechanisms and importance of uniformity of structure are deliberated.
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Fanni AM, Monge FA, Lin CY, Thapa A, Bhaskar K, Whitten DG, Chi EY. High Selectivity and Sensitivity of Oligomeric p-Phenylene Ethynylenes for Detecting Fibrillar and Prefibrillar Amyloid Protein Aggregates. ACS Chem Neurosci 2019; 10:1813-1825. [PMID: 30657326 DOI: 10.1021/acschemneuro.8b00719] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Misfolding and aggregation of amyloid proteins into fibrillar aggregates is a central pathogenic event in neurodegenerative disorders such as Alzheimer's (AD) and Parkinson's diseases (PD). Currently, there is a lack of reliable sensors for detecting the range of protein aggregates involved in disease etiology, particularly the prefibrillar aggregate conformations that are more neurotoxic. In this study, the fluorescent sensing of two novel oligomeric p-phenylene ethynylenes (OPEs), anionic OPE1- and cationic OPE2+, for detecting prefibrillar and fibrillar aggregates of AD-associated amyloid-β (Aβ40 and Aβ42) and PD-associated α-synuclein proteins (wildtype, and single mutants A30P, E35K, and A53T) over their monomeric counterparts, were tested. Furthermore, the performance of OPEs was evaluated and compared to thioflavin T (ThT), the most widely used fibril dye. Our results show that OPE1- and OPE2+ exhibited aggregate-specific binding inducing large fluorescence turn-on and spectral shifts based on a combination of backbone planarization, hydrophobic unquenching, and superluminescent OPE complex formation sensing modes. OPEs exhibited higher selectivity, higher binding affinity, and comparable limits of detection for Aβ40 fibrils compared to ThT. OPE2+ exhibited the largest fluorescence turn-on and highest sensitivity. Significantly, OPEs detected prefibrillar aggregates of Aβ42 and α-synuclein that ThT failed to detect. The superior sensing performance, the nonprotein specific detection, and the ability to selectively detect fibrillar and prefibrillar amyloid protein aggregates point to the potential of OPEs to overcome the limitations of existing probes and promise significant advancement in the detection of the myriad of protein aggregates involved in the early stages of AD and PD.
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Whitten DG, Tang Y, Zhou Z, Yang J, Wang Y, Hill EH, Pappas HC, Donabedian PL, Chi EY. A Retrospective: 10 Years of Oligo(phenylene-ethynylene) Electrolytes: Demystifying Nanomaterials. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:307-325. [PMID: 30056722 DOI: 10.1021/acs.langmuir.8b01810] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this retrospective, we first reviewed the synthesis of the oligo(phenylene-ethynylene) electrolytes (OPEs) we created in the past 10 years. Since the general antimicrobial activity of these OPEs had been reported in our previous account in Langmuir, we are focusing only on the unusual spectroscopic and photophysical properties of these OPEs and their complexes with anionic scaffolds and detergents in this Feature Article. We applied classical all-atom MD simulations to study the hydrogen bonding environment in the water surrounding the OPEs with and without detergents present. Our finding is that OPEs could form a unit cluster or unit aggregate with a few oppositely charged detergent molecules, indicating that the photostability and photoreactivity of these OPEs might be considerably altered with important consequences to their activity as antimicrobials and fluorescence-based sensors. Thus, in the following sections, we showed that OPE complexes with detergents exhibit enhanced light-activated biocidal activity compared to either OPE or detergent individually. We also found that similar complexes between certain OPEs and biolipids could be used to construct sensors for the enzyme activity. Finally, the OPEs could covalently bind to microsphere surfaces to make a bactericidal surface, which is simpler and more ordered than the surface grafted from microspheres with polyelectrolytes. In the Conclusions and Prospects section, we briefly summarize the properties of OPEs developed so far and future areas for investigation.
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Affiliation(s)
- David G Whitten
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Yanli Tang
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Zhijun Zhou
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Jianzhong Yang
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Ying Wang
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Eric H Hill
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Harry C Pappas
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Patrick L Donabedian
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Eva Y Chi
- Department of Chemical and Biological Engineering , University of New Mexico , Albuquerque , New Mexico 87131 , United States
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7
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Donabedian P, Evanoff M, Monge FA, Whitten DG, Chi EY. Substituent, Charge, and Size Effects on the Fluorogenic Performance of Amyloid Ligands: A Small-Library Screening Study. ACS OMEGA 2017; 2:3192-3200. [PMID: 30023689 PMCID: PMC6044928 DOI: 10.1021/acsomega.7b00231] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 06/01/2017] [Indexed: 05/24/2023]
Abstract
Developing new molecular ligands for the direct detection and tracking of amyloid protein aggregates is key to understanding and defeating myriad neurodegenerative and other disorders including Alzheimer's and Parkinson's diseases. A crucial factor in the performance of an amyloid dye is its ability to detect the amyloid structural motif independent of the sequence of the amyloid-forming protomer. The current study investigates structure-function relationships of a class of novel phenyleneethynylene (PPE)-based dyes and fluorescent polymers using amyloid fibrils formed by two model proteins: lysozyme and insulin. A small library of 18 PPE compounds that vary in molecular weights, charge densities, water solubilities, and types and geometries of functional groups was tested. One compound, the small anionic oligo(p-phenylene ethynylene) electrolyte OPE1, was identified as a selective sensor for the amyloid conformation of both lysozyme and insulin. On the basis of protein binding and photophysical changes observed in the dye from this set of PPE compounds, keys to the selective detection of the amyloid protein conformation include moderate size, negative charge, and substituents that provide high microenvironment sensitivity to the fluorescence yield. These principles can serve as a guide for the further refinement of the effective amyloid-sensing molecules.
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Affiliation(s)
- Patrick
L. Donabedian
- Nanoscience and Microsystems Engineering Graduate
Program, Center for Biomedical
Engineering, Biomedical Engineering Graduate Program, and Department of Chemical and Biological
Engineering, University of New Mexico, MSC01 1141, Albuquerque, New Mexico 87131, United States
| | - Mallory Evanoff
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Florencia A. Monge
- Nanoscience and Microsystems Engineering Graduate
Program, Center for Biomedical
Engineering, Biomedical Engineering Graduate Program, and Department of Chemical and Biological
Engineering, University of New Mexico, MSC01 1141, Albuquerque, New Mexico 87131, United States
| | - David G. Whitten
- Nanoscience and Microsystems Engineering Graduate
Program, Center for Biomedical
Engineering, Biomedical Engineering Graduate Program, and Department of Chemical and Biological
Engineering, University of New Mexico, MSC01 1141, Albuquerque, New Mexico 87131, United States
| | - Eva Y. Chi
- Nanoscience and Microsystems Engineering Graduate
Program, Center for Biomedical
Engineering, Biomedical Engineering Graduate Program, and Department of Chemical and Biological
Engineering, University of New Mexico, MSC01 1141, Albuquerque, New Mexico 87131, United States
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8
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Donabedian PL, Creyer MN, Monge FA, Schanze KS, Chi EY, Whitten DG. Detergent-induced self-assembly and controllable photosensitizer activity of diester phenylene ethynylenes. Proc Natl Acad Sci U S A 2017; 114:7278-7282. [PMID: 28642346 PMCID: PMC5514733 DOI: 10.1073/pnas.1702513114] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Photodynamic therapy, in which malignant tissue is killed by targeted light exposure following administration of a photosensitizer, can be a valuable treatment modality but currently relies on passive transport and local irradiation to avoid off-target oxidation. We present a system of excited-state control for truly local delivery of singlet oxygen. An anionic phenylene ethynylene oligomer is initially quenched by water, producing minimal fluorescence and no measurable singlet oxygen generation. When presented with a binding partner, in this case an oppositely charged surfactant, changes in solvent microenvironment result in fluorescence unquenching, restoration of intersystem crossing to the triplet state, and singlet oxygen generation, as assayed by transient absorption spectroscopy and chemical trapping. This solvation-controlled photosensitizer model has possible applications as a theranostic agent for, for example, amyloid diseases.
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Affiliation(s)
- Patrick L Donabedian
- Nanoscience and Microsystems Engineering Graduate Program, University of New Mexico, Albuquerque, NM 87131
- Center for Biomedical Engineering, University of New Mexico, Albuquerque, NM 87131
| | - Matthew N Creyer
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706
| | - Florencia A Monge
- Center for Biomedical Engineering, University of New Mexico, Albuquerque, NM 87131
- Biomedical Engineering Graduate Program, University of New Mexico, Albuquerque, NM 87131
| | - Kirk S Schanze
- Department of Chemistry, University of Florida, Gainesville, FL 32611
| | - Eva Y Chi
- Center for Biomedical Engineering, University of New Mexico, Albuquerque, NM 87131
- Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, NM 87131
| | - David G Whitten
- Center for Biomedical Engineering, University of New Mexico, Albuquerque, NM 87131;
- Department of Chemical and Biological Engineering, University of New Mexico, Albuquerque, NM 87131
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9
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Wang B, Wang M, Mikhailovsky A, Wang S, Bazan GC. A Membrane‐Intercalating Conjugated Oligoelectrolyte with High‐Efficiency Photodynamic Antimicrobial Activity. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701146] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Bing Wang
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Ming Wang
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Alexander Mikhailovsky
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Shu Wang
- Beijing National Laboratory for Molecular Science Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P.R. China
| | - Guillermo C. Bazan
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
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10
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Wang B, Wang M, Mikhailovsky A, Wang S, Bazan GC. A Membrane‐Intercalating Conjugated Oligoelectrolyte with High‐Efficiency Photodynamic Antimicrobial Activity. Angew Chem Int Ed Engl 2017; 56:5031-5034. [DOI: 10.1002/anie.201701146] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Bing Wang
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Ming Wang
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Alexander Mikhailovsky
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Shu Wang
- Beijing National Laboratory for Molecular Science Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P.R. China
| | - Guillermo C. Bazan
- Center for Polymers and Organic Solids Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
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11
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Donabedian PL, Pham TK, Whitten DG, Chi EY. Oligo(p-phenylene ethynylene) Electrolytes: A Novel Molecular Scaffold for Optical Tracking of Amyloids. ACS Chem Neurosci 2015; 6:1526-35. [PMID: 26114931 DOI: 10.1021/acschemneuro.5b00086] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Finding new optical probes to detect and track amyloid protein aggregates is key to understanding and defeating the myriad of neurodegenerative and other diseases associated with these misfolded proteins. Herein we report that a series of fluorescent, soluble oligo(p-phenylene ethynylene)s (OPEs) are able to detect amyloids in vitro by massive binding-activated superluminescence, with low micromolar affinity and high selectivity for the amyloid conformer. The OPEs track the kinetics of amyloid fibril formation from native hen egg white lysozyme (HEWL) similarly to thioflavin T (ThT), and the dependence of binding affinity on OPE length supports the theory of a linear binding groove. We hypothesize, based on spectral properties, induced circular dichroism, and previous work in analogous systems, that the fluorescence turn-on mechanism is a combination of the reduction of static solvent-mediated quenching at the ethyl ester end groups of the phenylene ethynylene fluorophore and the formation of chiral J-type aggregates templated on the amyloid fibril surface.
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Affiliation(s)
- Patrick L. Donabedian
- The Nanoscience and Microsystems Engineering Program, ‡Department of Chemical
and Biological Engineering, and §The Center for Biomedical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Thao K. Pham
- The Nanoscience and Microsystems Engineering Program, ‡Department of Chemical
and Biological Engineering, and §The Center for Biomedical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - David G. Whitten
- The Nanoscience and Microsystems Engineering Program, ‡Department of Chemical
and Biological Engineering, and §The Center for Biomedical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Eva Y. Chi
- The Nanoscience and Microsystems Engineering Program, ‡Department of Chemical
and Biological Engineering, and §The Center for Biomedical Engineering, University of New Mexico, Albuquerque, New Mexico 87131, United States
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12
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Aggregation of cationic p-phenylene ethynylenes on Laponite clay in aqueous dispersions and solid films. J Colloid Interface Sci 2015; 449:347-56. [DOI: 10.1016/j.jcis.2014.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 12/03/2014] [Accepted: 12/03/2014] [Indexed: 12/24/2022]
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13
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Werner S, Ebert H, Lechner BD, Lange F, Achilles A, Bärenwald R, Poppe S, Blume A, Saalwächter K, Tschierske C, Bacia K. Dendritic domains with hexagonal symmetry formed by x-shaped bolapolyphiles in lipid membranes. Chemistry 2015; 21:8840-50. [PMID: 25940233 PMCID: PMC4517157 DOI: 10.1002/chem.201405994] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Indexed: 12/22/2022]
Abstract
A novel class of bolapolyphile (BP) molecules are shown to integrate into phospholipid bilayers and self-assemble into unique sixfold symmetric domains of snowflake-like dendritic shapes. The BPs comprise three philicities: a lipophilic, rigid, π-π stacking core; two flexible lipophilic side chains; and two hydrophilic, hydrogen-bonding head groups. Confocal microscopy, differential scanning calorimetry, XRD, and solid-state NMR spectroscopy confirm BP-rich domains with transmembrane-oriented BPs and three to four lipid molecules per BP. Both species remain well organized even above the main 1,2-dipalmitoyl-sn-glycero-3-phosphocholine transition. The BP molecules only dissolve in the fluid membrane above 70 °C. Structural variations of the BP demonstrate that head-group hydrogen bonding is a prerequisite for domain formation. Independent of the head group, the BPs reduce membrane corrugation. In conclusion, the BPs form nanofilaments by π stacking of aromatic cores, which reduce membrane corrugation and possibly fuse into a hexagonal network in the dendritic domains.
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Affiliation(s)
- Stefan Werner
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
- ZIK HALOmem, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
| | - Helgard Ebert
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
| | - Bob-Dan Lechner
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
| | - Frank Lange
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
| | - Anja Achilles
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
| | - Ruth Bärenwald
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
| | - Silvio Poppe
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
| | - Alfred Blume
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
| | - Kay Saalwächter
- Institut für Physik - NMR, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
| | - Carsten Tschierske
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
| | - Kirsten Bacia
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany) E-mail:
- ZIK HALOmem, Martin-Luther-Universität Halle-Wittenberg06120 Halle (Saale) (Germany)
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14
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Mati SS, Chall S, Bhattacharya SC. Aggregation-induced fabrication of fluorescent organic nanorings: selective biosensing of cysteine and application to molecular logic gate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:5025-5032. [PMID: 25893428 DOI: 10.1021/acs.langmuir.5b00154] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Self-aggregation behavior in aqueous medium of four naphthalimide derivatives has exhibited substitution-dependent, unusual, aggregation induced emission enhancement (AIEE) phenomena. Absorption, emission, and time-resolved study initially indicated the formation of J-type fluorescent organic nanoaggregates (FONs). Simultaneous applications of infrared spectroscopy, theoretical studies, and dynamic light scattering (DLS) measurements explored the underlying mechanism of such substitution-selective aggregation of a chloro-naphthalimide organic molecule. Furthermore, transmission electron microscopy (TEM) visually confirmed the formation of ring like FONs with average size of 7.5-9.5 nm. Additionally, naphthalimide FONs also exhibited selective and specific cysteine amino acid sensing property. The specific behavior of NPCl aggregation toward amino acids was also employed as a molecular logic gate in information technology (IT).
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Affiliation(s)
| | - Sayantani Chall
- Department of Chemistry, Jadavpur University, Kolkata-700032, India
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15
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Hill EH, Zhang Y, Evans DG, Whitten DG. Enzyme-specific sensors via aggregation of charged p-phenylene ethynylenes. ACS APPLIED MATERIALS & INTERFACES 2015; 7:5550-5560. [PMID: 25697234 DOI: 10.1021/acsami.5b00185] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Chemical and biological sensors are sought for their ability to detect enzymes as biomarkers for symptoms of various disorders, or the presence of chemical pollutants or poisons. p-Phenylene ethynylene oligomers with pendant charged groups have been recently shown to have ideal photophysical properties for sensing. In this study, one anionic and one cationic oligomer are combined with substrates that are susceptible to enzymatic degradation by phospholipases or acetylcholinesterases. The photophysical properties of the J-aggregated oligomers with the substrate are ideal for sensing, with fluorescence quantum yields of the sensors enhanced between 30 and 66 times compared to the oligomers without substrate. The phospholipase sensor was used to monitor the activity of phospholipase A1 and A2 and obtain kinetic information, though phospholipase C did not degrade the sensor. The acetylcholinesterase sensor was used to monitor enzyme activity and was also used to detect the inhibition of acetylcholinesterase by three different inhibitors. Phospholipase A2 is a biomarker for heart and circulatory disease, and acetylcholinesterase is a biomarker for Alzheimer's, and indicative of exposure to certain pesticides and nerve agents. This work shows that phenylene ethynylene oligomers can be tailored to enzyme-specific sensors by careful selection of substrates that induce formation of a molecular aggregate, and that the sensing of enzymes can be extended to enzyme kinetics and detection of inhibition. Furthermore, the aggregates were studied through all-atom molecular dynamics, providing a molecular-level view of the formation of the molecular aggregates and their structure.
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Affiliation(s)
- Eric H Hill
- Center for Biomedical Engineering, Department of Chemical and Biological Engineering, and ‡The Nanoscience and Microsystems Engineering Program and Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131-1341, United States
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Lechner BD, Ebert H, Prehm M, Werner S, Meister A, Hause G, Beerlink A, Saalwächter K, Bacia K, Tschierske C, Blume A. Temperature-dependent in-plane structure formation of an X-shaped bolapolyphile within lipid bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2839-2850. [PMID: 25695502 DOI: 10.1021/la504903d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyphilic compound B12 is an X-shaped molecule with a stiff aromatic core, flexible aliphatic side chains, and hydrophilic end groups. Forming a thermotropic triangular honeycomb phase in the bulk between 177 and 182 °C but no lyotropic phases, it is designed to fit into DPPC or DMPC lipid bilayers, in which it phase separates at room temperature, as observed in giant unilamellar vesicles (GUVs) by fluorescence microscopy. TEM investigations of bilayer aggregates support the incorporation of B12 into intact membranes. The temperature-dependent behavior of the mixed samples was followed by differential scanning calorimetry (DSC), FT-IR spectroscopy, fluorescence spectroscopy, and X-ray scattering. DSC results support in-membrane phase separation, where a reduced main transition and new B12-related transitions indicate the incorporation of lipids into the B12-rich phase. The phase separation was confirmed by X-ray scattering, where two different lamellar repeat distances are visible over a wide temperature range. Polarized ATR-FTIR and fluorescence anisotropy experiments support the transmembrane orientation of B12, and FT-IR spectra further prove a stepwise "melting" of the lipid chains. The data suggest that in the B12-rich domains the DPPC chains are still rigid and the B12 molecules interact with each other via π-π interactions. All results obtained at temperatures above 75 °C confirm the formation of a single, homogeneously mixed phase with freely mobile B12 molecules.
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Affiliation(s)
- Bob-Dan Lechner
- Institut für Chemie - Physikalische Chemie and ‡Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle (Saale), Germany
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Garai A, Kumar S, Sinha W, Purohit CS, Das R, Kar S. A comparative study of optical nonlinearities of trans-A2B-corroles in solution and in aggregated state. RSC Adv 2015. [DOI: 10.1039/c5ra03568f] [Citation(s) in RCA: 12] [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 NLO properties of a series of FB corroles are studied in the solution as well as in the aggregated state (in the form of thin films).
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Affiliation(s)
- Antara Garai
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
| | - Samir Kumar
- School of Physical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
| | - Woormileela Sinha
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
| | - Chandra Shekhar Purohit
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
| | - Ritwick Das
- School of Physical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
| | - Sanjib Kar
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- Bhubaneswar-751005
- India
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Karam P, Hariri AA, Calver CF, Zhao X, Schanze KS, Cosa G. Interaction of anionic phenylene ethynylene polymers with lipids: from membrane embedding to liposome fusion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10704-10711. [PMID: 25115171 DOI: 10.1021/la502572u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Here we report spectroscopic studies on the interaction of negatively charged, amphiphilic polyphenylene ethynylene (PPE) polymers with liposomes prepared either from negative, positive or zwitterionic lipids. Emission spectra of PPEs of 7 and 49 average repeat units bearing carboxylate terminated side chains showed that the polymer embeds within positively charged lipids where it exists as free chains. No interaction was observed between PPEs and negatively charged lipids. Here the polymer remained aggregated giving rise to broad emission spectra characteristic of the aggregate species. In zwitterionic lipids, we observed that the majority of the polymer remained aggregated yet a small fraction readily embedded within the membrane. Titration experiments revealed that saturation of zwitterionic lipids with polymer typically occurred at a polymer repeat unit to lipid mole ratio close to 0.05. No further membrane embedding was observed above that point. For liposomes prepared from positively charged lipids, saturation was observed at a PPE repeat unit to lipid mole ratio of ∼0.1 and liposome precipitation was observed above this point. FRET studies showed that precipitation was preceded by lipid mixing and liposome fusion induced by the PPEs. This behavior was prominent for the longer polymer and negligible for the shorter polymer at a repeat unit to lipid mole ratio of 0.05. We postulate that fusion is the consequence of membrane destabilization whereby the longer polymer gives rise to more extensive membrane deformation than the shorter polymer.
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Affiliation(s)
- Pierre Karam
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS/CRMAA), McGill University , 801 Sherbrooke Street West, Montreal, Québec H3A 0B8, Canada
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Hill EH, Pappas HC, Whitten DG. Activating the antimicrobial activity of an anionic singlet-oxygen sensitizer through surfactant complexation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:5052-5056. [PMID: 24786342 DOI: 10.1021/la501230m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Cationic oligo-p-phenylene ethynylenes have shown much promise as broad-spectrum light-activated antimicrobial compounds against both Gram-positive and Gram-negative bacteria. The anionic varieties, however, have weak biocidal activity. In this study, a complex is formed between a weakly biocidal anionic oligomer and a cationic surfactant, and the effects on their biocidal activity against Gram-negative E. coli and Gram-positive S. aureus are explored. The enhancement in biocidal activity that is observed when the complex is irradiated suggests that interfacial surfactant gives the complex a net-positive charge, allowing it to associate strongly with the bacterial membrane. The results of this study demonstrate a method for the enhancement of biocidal activity of singlet-oxygen sensitizers and corroborate the use of surfactants as trans-membrane drug-delivery agents.
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Affiliation(s)
- Eric H Hill
- Center for Biomedical Engineering, Department of Chemical and Nuclear Engineering and the Nanoscience and Microsystems Engineering Program, University of New Mexico , Albuquerque, New Mexico 87131-1341, United States
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