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Nandi S, Sarkar N. Interactions between Lipid Vesicle Membranes and Single Amino Acid Fibrils: Probable Origin of Specific Neurological Disorders. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1971-1987. [PMID: 38240221 DOI: 10.1021/acs.langmuir.3c02429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
Amyloid fibrils are known to be responsible for several neurological disorders, like Alzheimer's disease (AD), Parkinson's disease (PD), etc. For decades, mostly proteins and peptide-based amyloid fibrils have been focused on, and the topic has acknowledged the rise, development, understanding of, and controversy, as well. However, the single amino acid based amyloid fibrils, responsible for several disorders, such as phenylketonuria, tyrosenimia type II, hypermethioninemia, etc., have gotten scientific attention lately. To understand the molecular level pathogenesis of such disorders originated due to the accumulation of single amino acid-based amyloid fibrils, interaction of these fibrils with phospholipid vesicle membranes is found to be an excellent cell-free in vitro setup. Based on such an in vitro setup, these fibrils show a generic mechanism of membrane insertion driven by electrostatic and hydrophobic effects inside the membrane that reduces the integral rigidity of the membrane. Alteration of such fundamental properties of the membrane, therefore, might be referred to as one of the prime pathological factors for the development of these neurological disorders. Hence, such interactions must be investigated in cellular and intracellular compartments to design suitable therapeutic modulators against fibrils.
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Affiliation(s)
- Sourav Nandi
- Yale School of Medicine, Yale University, New Haven, Connecticut 06510, United States
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India
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2
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Adhyapak P, Dong W, Dasgupta S, Dutta A, Duan M, Kapoor S. Lipid Clustering in Mycobacterial Cell Envelope Layers Governs Spatially Resolved Solvation Dynamics. Chem Asian J 2022; 17:e202200146. [PMID: 35419975 DOI: 10.1002/asia.202200146] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/30/2022] [Indexed: 11/06/2022]
Abstract
The mycobacterial cell envelope acts as a multilayered barrier to drugs. However, the role of lipid composition in the properties of different mycobacterial membranes, otherwise dictating their interactions with drugs, is poorly understood. In this study, we found that hydration states, solvation relaxation kinetics, rotational lipid mobility, and lateral lipid diffusion differed between inner and outer mycobacterial membranes. Molecular modeling showed that lipid clustering patterns governed membrane dynamics in the different layers of the cell envelope. By regulating membrane properties, lipid composition and structure modulated water abundance and interactions with lipid head groups. These findings can help deepen our understanding of the physical chemistry underlying membrane structure and function, as well as the interaction of mycobacterial membranes with drugs and host membranes.
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Affiliation(s)
- Pranav Adhyapak
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Wanqian Dong
- Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Souradip Dasgupta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Anindya Dutta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Mojie Duan
- Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China
| | - Shobhna Kapoor
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India.,Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, 739-8528, Japan
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3
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Kundu S, Malik S, Ghosh M, Nandi S, Pyne A, Debnath A, Sarkar N. A Comparative Study on DMSO-Induced Modulation of the Structural and Dynamical Properties of Model Bilayer Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2065-2078. [PMID: 33529530 DOI: 10.1021/acs.langmuir.0c03037] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Modulating the structures and properties of biomembranes via permeation of small amphiphilic molecules is immensely important, having diverse applications in cell biology, biotechnology, and pharmaceuticals, because their physiochemical and biological interactions lead to new pathways for transdermal drug delivery and administration. In this work, we have elucidated the role of dimethyl sulfoxide (DMSO), broadly used as a penetration-enhancing agent and cryoprotective agent on model lipid membranes, using a combination of fluorescence microscopy and time-resolved fluorescence spectroscopy. Spatially resolved fluorescence lifetime imaging microscopy (FLIM) has been employed to unravel how the fluidity of the DMSO-induced bilayer regulates the structural alteration of the vesicles. Moreover, we have also shown that the dehydration effect of DMSO leads to weakening of the hydrogen bond between lipid headgroups and water molecules and results in faster solvation dynamics as demonstrated by femtosecond time-resolved fluorescence spectroscopy. It has been gleaned that the water dynamics becomes faster because bilayer rigidity decreases in the presence of DMSO, which is also supported by time-resolved rotational anisotropy measurements. The enhanced diffusivity and increased membrane fluidity in the presence of DMSO are further ratified at the single-molecule level through fluorescence correlation spectroscopy (FCS) measurements. Our results indicate that while the presence of DMSO significantly affects the 1,2-dimyristoyl-rac-glycero-3-phosphocholine (DMPC) and 1,2-dipalmitoyl-rac-glycero-3-phosphatidylcholine (DPPC) bilayers, it has a weak effect on 1,2-dimyristoyl-sn-glycero-3-phospho-rac-glycerol (DMPG) vesicles, which might explain the preferential interaction of DMSO with the positively charged choline group present in DMPC and DPPC vesicles. The experimental findings have also been further verified with molecular dynamics simulation studies. Moreover, it has been observed that DMSO is likely to have a differential effect on heterogeneous bilayer membranes depending on the structure and composition of their headgroups. Our results illuminate the importance of probing the lipid structure and composition of cellular membranes in determining the effects of cryoprotective agents.
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Affiliation(s)
- Sangita Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Sheeba Malik
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Meghna Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Sourav Nandi
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Arghajit Pyne
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Ananya Debnath
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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Mondal D, Malik S, Banerjee P, Kundu N, Debnath A, Sarkar N. Modulation of Membrane Fluidity to Control Interfacial Water Structure and Dynamics in Saturated and Unsaturated Phospholipid Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12423-12434. [PMID: 33035065 DOI: 10.1021/acs.langmuir.0c02736] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The structure and dynamics of interfacial water in biological systems regulate the biochemical reactions. But, it is still enigmatic how the behavior of the interfacial water molecule is controlled. Here, we have investigated the effect of membrane fluidity on the structure and dynamics of interfacial water molecules in biologically relevant phopholipid vesicles. This study delineates that modulation of membrane fluidity through interlipid separation and unsaturation not only mitigate membrane rigidity but also disrupt the strong hydrogen bond (H-bond) network around the lipid bilayer interface. As a result, a disorder in H-bonding between water molecules arises several layers beyond the first hydration shell of the polar headgroup, which essentially modifies the interfacial water structure and dynamics. Furthermore, we have also provided evidence of increasing transportation through these modulated membranes, which enhance the membrane mediated isomerization reaction rate.
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Affiliation(s)
- Dipankar Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
| | - Sheeba Malik
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
- Environment Research Group, R&D and Scientific Services Department, Tata Steel Ltd., Jamshedpur 831007, India
| | - Ananya Debnath
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
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5
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Nandi S, Pyne A, Ghosh M, Banerjee P, Ghosh B, Sarkar N. Antagonist Effects of l-Phenylalanine and the Enantiomeric Mixture Containing d-Phenylalanine on Phospholipid Vesicle Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2459-2473. [PMID: 32073868 DOI: 10.1021/acs.langmuir.9b03543] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
One of the congenital flaws of metabolism, phenylketonuria (PKU), is known to be related to the self-assembly of toxic fibrillar aggregates of phenylalanine (Phe) in blood at elevated concentrations. Our experimental findings using l-phenylalanine (l-Phe) at millimolar concentration suggest the formation of fibrillar morphologies in the dry phase, which in the solution phase interact strongly with the model membrane composed of 1,2-diacyl-sn-glycero-phosphocholine (LAPC) lipid, thereby decreasing the rigidity (or increasing the fluidity) of the membrane. The hydrophobic interaction, in addition to the electrostatic attraction of Phe with the model membrane, is found to be responsible for such phenomena. On the contrary, various microscopic observations reveal that such fibrillar morphologies of l-Phe are severely ruptured in the presence of its enantiomer d-phenylalanine (d-Phe), thereby converting the fibrillar morphologies into crushed flakes. Various biophysical studies, including the solvation dynamics experiment, suggest that this l-Phe in the presence of d-Phe, when interacting with the same model membrane, now reverts the rigidity of the membrane, i.e., increases the rigidity of the membrane, which was lost due to interaction with l-Phe exclusively. Fluorescence anisotropy measurements also support this reverse rigid character of the membrane in the presence of an enantiomeric mixture of amino acids. A comprehensive understanding of the interaction of Phe with the model membrane is further pursued at the single-molecular fluorescence detection level using fluorescence correlation spectroscopy (FCS) experiments. Therefore, our experimental conclusion interprets a linear correlation between increased permeability and enhanced fluidity of the membrane in the presence of l-Phe and certifies d-Phe as a therapeutic modulator of l-Phe fibrillar morphologies. Further, the study proposes that the rigidity of the membrane lost due to interaction with l-Phe was reinstated-in fact, increased-in the presence of the enantiomeric mixture containing both d- and l-Phe.
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Banerjee P, Pyne A, Sarkar N. Understanding the Self-Assembling Behavior of Biological Building Block Molecules: A Spectroscopic and Microscopic Approach. J Phys Chem B 2020; 124:2065-2080. [PMID: 32081003 DOI: 10.1021/acs.jpcb.9b09123] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
"Mother nature" utilizes molecular self-assembly as an efficient tool to design several fascinating supramolecular architectures from simple building blocks like amino acids, peptides, and nucleobases. The self-assembling behavior of various biologically important molecules, morphological outcomes, molecular mechanism of association, and finally their applications in the real world draw broad interest from chemical and biological point of views. In this present Feature Article, the amyloid hypothesis is extended to include nonproteinaceous single metabolites that invoke a new paradigm for the pathology of inborn metabolic disorders. In this scenario, we dedicate this paper to understanding the morphological consequences and mechanistic insight of the self-assembly of some important amino acids (e.g., l-phenylalanine, l-tyrosine, glycine, etc.) and nucleobases (adenine and eight uracil moiety derivatives). Using proper spectroscopic and microscopic tools, distinct assembling mechanisms of different amino acids and nucleobases have been established. Again, lanthanides, polyphenolic compounds such as crown ethers, and a worldwide drink, beer, are elegantly employed as inhibitors of the resulting fibrillar aggregated structures. As a consequence, this study will cover literally a vast region in the self-assembling outcomes of single biologically important molecules, and therefore, we expect that a detailed understanding of such morphological outcomes using spectroscopic and microscopic approaches may open a new paradigm in this burgeoning field.
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Affiliation(s)
- Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302 WB, India
| | - Arghajit Pyne
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302 WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302 WB, India
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7
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Spectroscopic investigation on alteration of dynamic properties of lipid membrane in presence of Gamma-Aminobutyric Acid (GABA). J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111877] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Tarif E, Saha B, Mukherjee K, De P, Biswas R. Exploring Aqueous Solution Dynamics of an Amphiphilic Diblock Copolymer: Dielectric Relaxation and Time-Resolved Fluorescence Measurements. J Phys Chem B 2019; 123:5892-5901. [DOI: 10.1021/acs.jpcb.9b00889] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ejaj Tarif
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Biswajit Saha
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Kallol Mukherjee
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
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9
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Bapli A, Gautam RK, Jana R, Seth D. Investigation of Different Prototropic Forms of Biologically Active Flavin Lumichrome in the Presence of Liposome. Photochem Photobiol 2019; 95:1151-1159. [PMID: 30932194 DOI: 10.1111/php.13105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/26/2019] [Indexed: 12/26/2022]
Abstract
Herein, we reported the photophysical behavior of lumichrome (LC), one of the biologically active flavin molecules, in the presence of small unilamellar vesicle of anionic lipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). With the help of different spectroscopic techniques, we have proposed that anionic DMPC liposome interacts with the cationic form LC in ground state and in excited state and modulate the spectral properties of LC. Photophysical study reveals that different prototropic forms of LC are present in DMPC liposome medium. In the presence of DMPC liposome, fluorescence emission properties of LC vary with change in excitation and emission wavelengths. This indicates switch over between different structural forms of LC. From fluorescence lifetime measurements and fluorescence lifetime imaging (FLIM) study, it was revealed that emission decay profile of LC was fitted biexponentially in the presence of liposome. It suggests that in the presence of liposome, more than one form of LC is present. We have constructed the time-resolved area-normalized emission spectra (TRANES) of LC in the liposome and found one isoemissive point. This confirmed that two emissive species of LC are present in liposome. FLIM study and FE-SEM study give an idea about the structural feature of the complex between LC and liposome.
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Affiliation(s)
- Aloke Bapli
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | | | - Rabindranath Jana
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
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10
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Kundu N, Banik D, Sarkar N. Self-Assembly of Amphiphiles into Vesicles and Fibrils: Investigation of Structure and Dynamics Using Spectroscopy and Microscopy Techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11637-11654. [PMID: 29544249 DOI: 10.1021/acs.langmuir.7b04355] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amphiphiles are a class of molecules which are known to assemble into a variety of nanostructures. The understanding and applications of self-assembled systems are based on what has been learned from biology. Among the vast number of self-assemblies, in this article, we have described the formation, characterization, and dynamics of two important biologically inspired assemblies: vesicles and fibrils. Vesicles, which can be classified into several categories depending on the sizes and components, are of great interest due to their potential applications in drug delivery and as nanoscale reactors. The structure and dynamics of vesicles can also mimic the complex geometry of the cell membrane. On the other hand, the self-assembly of proteins, peptides, and even single amino acids leads to a number of degenerative disorders. Thus, a complete understanding of these self-assembled systems is necessary. In this article, we discuss recent work on vesicular aggregates composed of phospholipids, fatty acids, and ionic as well as nonionic surfactants and single amino acid-based fibrils such as phenylalanine and tyrosine. Beside the characterization, we also emphasize the excited-state dynamics inside the aggregates for a proper understanding of the organization, reactivity, and heterogeneity of the aggregates.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
| | - Debasis Banik
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
| | - Nilmoni Sarkar
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
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Paul BK, Ghosh N, Mukherjee S. Association and sequestered dissociation of an anticancer drug from liposome membrane: Role of hydrophobic hydration. Colloids Surf B Biointerfaces 2018; 170:36-44. [PMID: 29864652 DOI: 10.1016/j.colsurfb.2018.05.064] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/23/2018] [Accepted: 05/29/2018] [Indexed: 01/31/2023]
Abstract
Herein, the interaction of a potent anticancer drug (Sanguinarine, SG) with dimyristoyl-l-α-phosphatidylglycerol (DMPG) liposome membrane has been investigated at physiological pH. The spectroscopic fluorescence decay results demonstrate a modification of the photophysics of SG within DMPG-encapsulated state leading to preferential stabilization of the iminium ion over the alkanolamine form. This suggests a key role of electrostatic force underlying the interaction. The complex dependence of the thermodynamic parameters on temperature yields a unique finding of a positive heat capacity change (ΔCp) indicating the signature of hydrophobic hydration. The study also demonstrates the application of β-cyclodextrin (βCD) as a prospective host system resulting in release of the DMPG-bound drug. A calorimetric exploration of the DMPG-βCD interaction reveals an intrinsically complex thermodynamics of the process leading to ΔCp > 0 and thus marking the instrumental role of hydrophobic hydration which follows that the DMPG-βCD interaction is accompanied with burial of polar molecular surfaces. A systematic investigation of the diffusion of the drug within various microheterogeneous environments by Fluorescence Correlation Spectroscopy (FCS) categorically reinforces our arguments.
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Affiliation(s)
- Bijan K Paul
- Department of Chemistry, Mahadevananda Mahavidyalaya, Barrackpore, Kolkata 700120, West Bengal, India
| | - Narayani Ghosh
- Department of General Science and Humanities, Modern Institute of Engineering and Technology, Bandel, Kolkata 712123, West Bengal, India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India.
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12
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Das S, Purkayastha P. Modulating Thiazole Orange Aggregation in Giant Lipid Vesicles: Photophysical Study Associated with FLIM and FCS. ACS OMEGA 2017; 2:5036-5043. [PMID: 31457780 PMCID: PMC6641685 DOI: 10.1021/acsomega.7b00899] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 08/14/2017] [Indexed: 06/10/2023]
Abstract
Thiazole orange (TO) exists mainly as a monomer in aqueous medium, where its fluorescence is negligibly small due to intramolecular movements. In the present study, it has been shown that in presence of giant unilamellar vesicles, produced from anionic lipid molecules, TO prefers to form H-dimer and H-aggregates at low lipid concentrations. The nonfluorescent form of TO (monomer) starts fluorescing in the aggregated or dimeric forms. At higher 1,2-dimyristoyl-sn-glycero-3-phospho-(1'-rac-glycerol) concentration, the TO aggregates disintegrate to the monomeric variants. This is principally due to generation of more surface of residence for the TO molecules. The dye molecules/aggregates reside on the outer surface as well as percolate inside the lipid vesicles toward the inner water pool due to the presence of anionic charges at the interface. We adopted fluorescence lifetime imaging to find out the heterogeneity in photophysics of the different forms of TO inside the lipid vesicles supported by fluorescence correlation spectroscopy to characterize the formation or disintegration of the TO aggregates.
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Affiliation(s)
- Shrabanti Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, WB, India
| | - Pradipta Purkayastha
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, WB, India
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Das A, Adhikari C, Chakraborty A. Interaction of Different Divalent Metal Ions with Lipid Bilayer: Impact on the Encapsulation of Doxorubicin by Lipid Bilayer and Lipoplex Mediated Deintercalation. J Phys Chem B 2017; 121:1854-1865. [DOI: 10.1021/acs.jpcb.6b11443] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Anupam Das
- Discipline of Chemistry, Indian Institute of Technology Indore, Indore, Madhya Pradesh 452020, India
| | - Chandan Adhikari
- Discipline of Chemistry, Indian Institute of Technology Indore, Indore, Madhya Pradesh 452020, India
| | - Anjan Chakraborty
- Discipline of Chemistry, Indian Institute of Technology Indore, Indore, Madhya Pradesh 452020, India
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14
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Kundu N, Banerjee P, Kundu S, Dutta R, Sarkar N. Sodium Chloride Triggered the Fusion of Vesicle Composed of Fatty Acid Modified Protic Ionic Liquid: A New Insight into the Membrane Fusion Monitored through Fluorescence Lifetime Imaging Microscopy. J Phys Chem B 2016; 121:24-34. [PMID: 27959558 DOI: 10.1021/acs.jpcb.6b09298] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The development of stable vesicular assemblies and the understanding of their interaction and dynamics in aqueous solution are long-standing topics in the research of chemistry and biology. Fatty acids are known to form vesicle structure in aqueous solution depending on the pH of the medium. Protic ionic liquid of fatty acid with ethyl amine (oleate ethyl amine, OEA) as a component spontaneously forms a vesicle in aqueous solution. The general comparison of dynamics and interaction of these two vesicles have been drawn using fluorescence correlation spectroscopy (FCS) and fluorescence lifetime imaging microscopy (FLIM) measurements. Further, FLIM images of a single vesicle are taken at multiple wavelengths, and the solvation of the probe molecules has been observed from the multiwavelength FLIM images. The lifetime of the probe molecule in OEA vesicle is higher than that in simple fatty acid vesicles. Therefore, it suggests that the membrane of the OEA vesicle is more dehydrated compared to that of fatty acid vesicles, and it facilitates OEA vesicles to fuse themselves in the presence of electrolyte, sodium chloride (NaCl). However, under the same conditions, only fatty acid vesicles do not fuse. The fusion of OEA vesicles is successfully demonstrated by the time scan FLIM measurements. The different events in the fusion process are analyzed in the light of the reported model of vesicle fusion. Finally, the local viscosity of the water pool of the vesicle is determined using kiton red, as a molecular rotor. With addition of NaCl, the fluidity in the interior of the vesicle is increased which leads to disassembly of vesicle. The rich dynamic properties of this vesicular assembly and the FLIM based approach of vesicle fusion will provide better insight into the growth of a protocell membrane.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302 WB, India
| | - Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302 WB, India
| | - Sangita Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302 WB, India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302 WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302 WB, India
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Kundu N, Banerjee P, Dutta R, Kundu S, Saini RK, Halder M, Sarkar N. Proton Transfer Pathways of 2,2'-Bipyridine-3,3'-diol in pH Responsive Fatty Acid Self-Assemblies: Multiwavelength Fluorescence Lifetime Imaging in a Single Vesicle. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13284-13295. [PMID: 27951700 DOI: 10.1021/acs.langmuir.6b03404] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Fatty acids are known to form different supramolecular aggregates in aqueous solutions depending on the pH of the medium. The dynamics of the transformation of oleate micelles into oleic acid/oleate vesicles has been investigated using a pH-sensitive intramolecular proton transfer fluorophore, 2,2'-bipyridine-3,3'-diol [BP(OH)2]. Different prototropic forms of BP(OH)2 exist in different pH values of the system, and thus, the ground state and the excited state dynamics of BP(OH)2 have been modulated in these confined media. The formation of different tautomeric forms of BP(OH)2 in oleate micelles (at basic pH) is confirmed using time-resolved emission spectra and fluorescence anisotropy measurements. The hydrophobic environment provided by these assemblies reduces the water-assisted nonradiative decay channels and lengthens the fluorescence lifetime of BP(OH)2. The rotational relaxation time in the micellar assembly is higher than that in the vesicle, which may be due to the higher microviscosity sensed by the fluorophore in the micelle. Besides, we have shown for the first time that BP(OH)2 can be used as a membrane-bound fluorophore, using fluorescence lifetime imaging microscopy (FLIM). A broad distribution in the size of the vesicle is observed from the FLIM image. Further, we have used multiwavelength FLIM to collect the FLIM images of a single vesicle at different emission wavelengths, and the lifetime distribution obtained from the FLIM images at different emission wavelengths in a single vesicle correlates well with the lifetime values obtained from the ensemble average measurements in the bulk solution.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Sangita Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Rajesh Kumar Saini
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Mintu Halder
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, West Bengal, India
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16
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Roy A, Banerjee P, Dutta R, Kundu S, Sarkar N. Probing the Interaction between a DNA Nucleotide (Adenosine-5'-Monophosphate Disodium) and Surface Active Ionic Liquids by Rotational Relaxation Measurement and Fluorescence Correlation Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10946-10956. [PMID: 27690468 DOI: 10.1021/acs.langmuir.6b02794] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This article demonstrates the interaction of a deoxyribonucleic acid (DNA) nucleotide, adenosine-5'-monophosphate disodium (AMP) with a cationic surface active ionic liquid (SAIL) 1-dodecyl-3-methylimidazoium chloride (C12mimCl), and an anionic SAIL, 1-butyl-3-methylimidazolium n-octylsulfate ([C4mim][C8SO4]). Dynamic light scattering (DLS) measurements and 1H NMR (nuclear magnetic resonance) studies indicate that substantial interaction is taking place among the DNA nucleotide (AMP) and the SAILs. Moreover, cryogenic transmission electron microscopy (cryo-TEM) suggests that SAILs containing micellar assemblies are transformed into larger micellar assemblies in the presence of DNA nucleotides. Additionally, the rotational motion of two oppositely charged molecules, rhodamine 6G perchlorate (R6G) and fluorescein sodium salt (Fl-Na), have been monitored in these aggregates. The rotational motion of R6G and Fl-Na differs significantly between SAILs micelles and SAILs-AMP containing larger micellar aggregates. The effect of negatively charged DNA nucleotide (AMP) addition into the cationic and anionic SAILs is more prominent for the cationic charged molecule R6G than that of anionic probe Fl-Na due to the favorable electrostatic interaction between the AMP and cationic R6G. Moreover, the influence of the anionic DNA nucleotide on the cationic and anionic SAIL micelles is monitored through the variation of the lateral diffusion motion of oppositely charged probe molecules (R6G and Fl-Na) inside these aggregates. This variation in diffusion coefficient values also suggests that the interaction pattern of these oppositely charged probes are different within the SAILs-nucleotide containing aggregates. Therefore, both rotational and translational diffusion measurements confirm that the DNA nucleotide (AMP) renders more rigid microenvironment within the micellar solution of SAILs.
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Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB India
| | - Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB India
| | - Sangita Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB India
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17
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Roy A, Dutta R, Kundu N, Banik D, Sarkar N. A Comparative Study of the Influence of Sugars Sucrose, Trehalose, and Maltose on the Hydration and Diffusion of DMPC Lipid Bilayer at Complete Hydration: Investigation of Structural and Spectroscopic Aspect of Lipid-Sugar Interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5124-5134. [PMID: 27133799 DOI: 10.1021/acs.langmuir.6b01115] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is well-known that sugars protect membrane structures against fusion and leakage. Here, we have investigated the interaction between different sugars (sucrose, trehalose, and maltose) and phospholipid membrane of 1,2-dimyristoyl-sn-glycero-3-phoshpocholine (DMPC) using dynamic light scattering (DLS), transmission electron microscopy (TEM), and other various spectroscopic techniques. DLS measurement reveals that the addition of sugar molecule results a significant increase of the average diameter of DMPC membrane. We have also noticed that in the presence of different sugars the rotational relaxation and solvation time of coumarin 480 (C480) and coumarin 153 (C153) surrounding DMPC membrane increases, suggesting a marked reduction of the hydration behavior at the surface of phospholipid membrane. In addition, we have also investigated the effect of sugar molecules on the lateral mobility of phospholipids. Interestingly, the relative increase in rotational, solvation and lateral diffusion is more prominent for C480 than that of C153 because of their different location in lipid bilayer. It is because of preferential location of comparatively hydrophilic probe C480 in the interfacial region of the lipid bilayer. Sugars intercalate with the phospholipid headgroup through hydrogen bonding and replace smaller sized water molecules from the membrane surface. Therefore, overall, we have monitored a comparative analysis regarding the interaction of different sugar molecules (sucrose, trehalose, and maltose) with the DMPC membrane through DLS, TEM, solvation dynamics, time-resolved anisotropy, and fluorescence correlation spectroscopy (FCS) measurements to explore the structural and spectroscopic aspect of lipid-sugar interaction.
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Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
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18
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Ghosh S, Bhattacharyya K. Single-molecule Spectroscopy: Exploring Heterogeneity in Chemical and Biological Systems. CHEM REC 2016; 16:601-13. [DOI: 10.1002/tcr.201500214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Shirsendu Ghosh
- Department of Physical Chemistry; Indian Association for the Cultivation of Science; 2A and 2B, Raja Subodh Chandra Mullick Rd Jadavpur, Kolkata West Bengal 700032 India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry; Indian Association for the Cultivation of Science; 2A and 2B, Raja Subodh Chandra Mullick Rd Jadavpur, Kolkata West Bengal 700032 India
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19
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Singh MK, Shweta H, Khan MF, Sen S. New insight into probe-location dependent polarity and hydration at lipid/water interfaces: comparison between gel- and fluid-phases of lipid bilayers. Phys Chem Chem Phys 2016; 18:24185-97. [DOI: 10.1039/c6cp01201a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Location dependent polarity and hydration probed by a new series of 4-aminophthalimide-based fluorescent molecules (4AP-Cn;n= 2–10, 12) show different behaviour at gel- and fluid-phase lipid/water interfaces.
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Affiliation(s)
- Moirangthem Kiran Singh
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Him Shweta
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Mohammad Firoz Khan
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Sobhan Sen
- Spectroscopy Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
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20
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Roy B, Satpathi S, Gavvala K, Koninti RK, Hazra P. Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System. J Phys Chem B 2015; 119:11721-31. [PMID: 26258397 DOI: 10.1021/acs.jpcb.5b04370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Reverse hexagonal (HII) liquid crystalline material based on glycerol monooleate (GMO) is considered as a potential carrier for drugs and other important biomolecules due to its thermotropic phase change and excellent morphology. In this work, the dynamics of encapsulated water, which plays important role in stabilization and formation of reverse hexagonal mesophase, has been investigated by time dependent Stokes shift method using Coumarin-343 as a solvation probe. The formation of the reverse hexagonal mesophase (HII) and transformation to the L2 phase have been monitored using small-angle X-ray scattering and polarized light microscopy experiments. REES studies suggest the existence of different polar regions in both HII and L2 systems. The solvation dynamics study inside the reverse hexagonal (HII) phase reveals the existence of two different types of water molecules exhibiting dynamics on a 120-900 ps time scale. The estimated diffusion coefficients of both types of water molecules obtained from the observed dynamics are in good agreement with the measured diffusion coefficient collected from the NMR study. The calculated activation energy is found to be 2.05 kcal/mol, which is associated with coupled rotational-translational water relaxation dynamics upon the transition from "bound" to "quasi-free" state. The observed ∼2 ns faster dynamics of the L2 phase compared to the HII phase may be associated with both the phase transformation as well as thermotropic effect on the relaxation process. Microviscosities calculated from time-resolved anisotropy studies infer that the interface is almost ∼22 times higher viscous than the central part of the cylinder. Overall, our results reveal the unique dynamical features of water inside the cylinder of reverse hexagonal and inverse micellar phases.
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Affiliation(s)
- Bibhisan Roy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Sagar Satpathi
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Krishna Gavvala
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Raj Kumar Koninti
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
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21
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Kuchlyan J, Banik D, Roy A, Kundu N, Sarkar N. Vesicles Formation by Zwitterionic Micelle and Poly-l-lysine: Solvation and Rotational Relaxation Study. J Phys Chem B 2015; 119:8285-92. [PMID: 26053544 DOI: 10.1021/acs.jpcb.5b02893] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jagannath Kuchlyan
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Arpita Roy
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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22
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Ghosh S, Ghosh C, Nandi S, Bhattacharyya K. Unfolding and refolding of a protein by cholesterol and cyclodextrin: a single molecule study. Phys Chem Chem Phys 2015; 17:8017-27. [DOI: 10.1039/c5cp00385g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cholesterol induced unfolding of a globular protein, human serum albumin (HSA), and β-cyclodextrin induced refolding of the unfolded protein is demonstrated in this study.
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Affiliation(s)
- Shirsendu Ghosh
- Department of Physical Chemistry
- Indian Association For The cultivation of Science
- Kolkata 700 032
- India
| | - Catherine Ghosh
- Department of Physical Chemistry
- Indian Association For The cultivation of Science
- Kolkata 700 032
- India
| | - Somen Nandi
- Department of Physical Chemistry
- Indian Association For The cultivation of Science
- Kolkata 700 032
- India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry
- Indian Association For The cultivation of Science
- Kolkata 700 032
- India
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23
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Cao J, Seekell R, Li Y, Wang X, Zhan S, Li Y. High Yield of Supergiant Vesicles on Glyoxylic Acid Modified Aluminum Electrode. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.825568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Mandal S, Kuchlyan J, Ghosh S, Banerjee C, Kundu N, Banik D, Sarkar N. Vesicles Formed in Aqueous Mixtures of Cholesterol and Imidazolium Surface Active Ionic Liquid: A Comparison with Common Cationic Surfactant by Water Dynamics. J Phys Chem B 2014; 118:5913-23. [DOI: 10.1021/jp501033n] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Jagannath Kuchlyan
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Chiranjib Banerjee
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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25
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Ghosh S, Chattoraj S, Bhattacharyya K. Solvation Dynamics and Intermittent Oscillation of Cell Membrane: Live Chinese Hamster Ovary Cell. J Phys Chem B 2014; 118:2949-56. [DOI: 10.1021/jp412631d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shirsendu Ghosh
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700
032, India
| | - Shyamtanu Chattoraj
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700
032, India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700
032, India
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26
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Ghosh S, Chattoraj S, Chowdhury R, Bhattacharyya K. Structure and dynamics of lysozyme in DMSO–water binary mixture: fluorescence correlation spectroscopy. RSC Adv 2014. [DOI: 10.1039/c4ra00719k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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27
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Kel O, Tamimi A, Thielges MC, Fayer MD. Ultrafast Structural Dynamics Inside Planar Phospholipid Multibilayer Model Cell Membranes Measured with 2D IR Spectroscopy. J Am Chem Soc 2013; 135:11063-74. [DOI: 10.1021/ja403675x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oksana Kel
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Amr Tamimi
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Megan C. Thielges
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Michael D. Fayer
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
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28
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Ghosh S, Chattoraj S, Mondal T, Bhattacharyya K. Dynamics in cytoplasm, nucleus, and lipid droplet of a live CHO cell: time-resolved confocal microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7975-7982. [PMID: 23705762 DOI: 10.1021/la400840n] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Different regions of a single live Chinese hamster ovary (CHO) cell are probed by time-resolved confocal microscopy. We used coumarin 153 (C153) as a probe. The dye localizes in the cytoplasm, nucleus, and lipid droplets, as is clearly revealed by the image. The fluorescence correlation spectroscopy (FCS) data shows that the microviscosity of lipid droplets is ~34 ± 3 cP. The microviscosities of nucleus and cytoplasm are found to be 13 ± 1 and 14.5 ± 1 cP, respectively. The average solvation time (<τs>) in the lipid droplets (3600 ± 50 ps) is slower than that in the nucleus (<τs> = 750 ± 50 ps) and cytoplasm (<τs> = 1100 ± 50 ps). From the position of emission maxima of C153, the polarity of the nucleus is estimated to be similar to that of a mixture containing 26% DMSO in triacetin (η ~ 11.2 cP, ε ~ 26.2). The cytoplasm resembles a mixture of 18% DMSO in triacetin (η ∼ 12.6 cP, ε ∼ 21.9). The polarity of lipid droplets is less than that of pure triacetin (η ~ 21.7 cP, ε ~ 7.11).
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Affiliation(s)
- Shirsendu Ghosh
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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29
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Sasmal DK, Ghosh S, Das AK, Bhattacharyya K. Solvation dynamics of biological water in a single live cell under a confocal microscope. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2289-98. [PMID: 23336846 DOI: 10.1021/la3043473] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Time-resolved confocal microscopy has been applied to study the cytoplasm and nucleus region of a single live Chinese hamster ovary (CHO) cell. To select the cytoplasm and the nucleus region, two different fluorescent probes are used. A hydrophobic fluorescent dye, DCM, localizes preferentially in the cytoplasm region of a CHO cell. A DNA binding dye, DAPI, is found to be inside the nucleus of the cell. The locations of the probes are clearly seen in the image. Emission maxima of the dyes (DCM in cytoplasm and DAPI in the nucleus) are compared to those of the same dyes in different solvents. From this, it is concluded that the polarity (dielectric constant, ε) of the microenvironment of DCM in the cytoplasm is ~15. The nucleus is found to be much more polar with ε ≈ 60 (as reported by DAPI). The diffusion coefficient (and hence viscosity) in the cytoplasm and the nucleus was determined using fluorescence correlation spectroscopy (FCS). The diffusion coefficient (D(t)) of the dye (DCM) in the cytoplasm is 2 μm(2) s(-1) and is ~150 times slower than that in bulk water (buffer). D(t) of DAPI in the nucleus (15 μm(2) s(-1)) is 30 times slower than that in bulk water (buffer). The extremely slow diffusion inside the cell has been ascribed to higher viscosity and also to the binding of the probes (DCM and DAPI) to large biological macromolecules. The solvation dynamics of water in the cytoplasm (monitored by DCM) exhibits an average relaxation time [τ(sol)] of 1250 ± 50 ps, which is about 1000 times slower than in bulk water (1 ps). The solvation dynamics inside the nucleus (studied using DAPI) is about 2-fold faster, [τ(sol)] ≈ 775 ps. The higher polarity, faster diffusion, and faster solvation dynamics in the nucleus indicates that it is less crowded and less restricted than the cytoplasm.
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Affiliation(s)
- Dibyendu Kumar Sasmal
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
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30
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Chatterjee A, Maity B, Seth D. The photophysics of 7-(N,N′-diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles: an excitation wavelength dependent study. Phys Chem Chem Phys 2013; 15:1894-906. [DOI: 10.1039/c2cp43483k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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