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Das A, Acharjee D, Panda MK, Mahato AB, Ghosh S. Dodecahedron CsPbBr 3 Perovskite Nanocrystals Enable Facile Harvesting of Hot Electrons and Holes. J Phys Chem Lett 2023; 14:3953-3960. [PMID: 37078668 DOI: 10.1021/acs.jpclett.3c00661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This Letter reports the facile harvesting of hot carriers (HCs) in a composite of 12-faceted dodecahedron CsPbBr3 nanocrystal (NC) and a scavenger molecule. We recorded ∼3.3 × 1011 s-1 HC cooling rate in NC when excited with ∼1.4 times the band gap energy (Eg), increasing to >3 × 1012 s-1 in the presence of scavengers at high concentration due to the HC extractions. Since the observed intrinsic charge transfer rate (∼1.7 × 1012 s-1) in our NC-scavenger complex is about an order of magnitude higher than the HC cooling rate (∼3.3 × 1011 s-1), carriers are harvested before their cooling. Further, a fluorescence correlation spectroscopy study reveals NC tends to form a quasi-stable complex with a scavenger molecule, ensuring charge transfer completed (τct ≈ 0.6 ps) much before the complex breaks apart (>600 μs). The overall results of our study highlight the promise shown by 12-faceted NCs and their implications in modern applications, including hot carrier solar cells.
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Affiliation(s)
- Ayendrila Das
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Debopam Acharjee
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Mrinal Kanti Panda
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Asit Baran Mahato
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
- Center for Interdisciplinary Sciences (CIS), National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
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2
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Rastogi H, Chowdhury PK. Correlating the Local and Global Dynamics of an Enzyme in the Crowded Milieu. J Phys Chem B 2022; 126:3208-3223. [PMID: 35442681 DOI: 10.1021/acs.jpcb.1c09759] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Enzymes are dynamic biological macromolecules, with their catalytic function(s) being largely influenced by the changes in local fluctuations of amino acid side chains as well as global structural modulations that the enzyme undergoes. Such local and global motions can be highly affected inside the crowded physiological interior of the cell. Here, we have addressed the role of dynamic structural flexibility in affecting the activation energy barrier of a flexible multidomain enzyme adenylate kinase (AK3L1, UniProtKB: Q9UIJ7). Activation energy profiles of both local (at three different sites along the polypeptide backbone) and global dynamics of the enzyme have been monitored using solvation studies on the subnanosecond time scale and tryptophan quenching studies over the temperature range of 278-323 K, respectively, under crowded conditions (Ficoll 70, Dextran 40, Dextran 70, and PEG 8). This study not only provides the site-specific mapping of dynamics but reveals that the activation energies associated with these local motions undergo a significant decrease in the presence of macromolecular crowders, providing new insights into how crowding affects internal protein dynamics. The crowded scenario also aids in enhancing the coupling between the local and global motions of the enzyme. Moreover, select portions/regions of the enzyme when taken together can well mirror the overall dynamics of the biomolecule, showing possible energy hotspots along the polypeptide backbone.
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Affiliation(s)
- Harshita Rastogi
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India 110016
| | - Pramit K Chowdhury
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India 110016
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3
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Mishra K, Acharjee D, Das A, Ghosh S. Subpicosecond Hot Hole Transfer in a Graphene Quantum Dot Composite with High Efficiency. J Phys Chem Lett 2022; 13:606-613. [PMID: 35019662 DOI: 10.1021/acs.jpclett.1c03530] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Extraction of hot carriers is of prime importance because of its potential to overcome the energy loss that limits the efficiency of an optoelectronic device. Employing a femtosecond upconversion setup, herein we report a few picoseconds carrier cooling time of colloidal graphene quantum dots (GQDs) is at least an order of magnitude slower compared to that in its bulk form. A slower carrier cooling time of GQDs compared to that of the other semiconductor quantum dots and their bulk materials is indeed a coveted property of GQDs that would allow one easy harvesting of high energy species employing a suitable molecular system as shown in this study. A subpicosecond hot hole transfer time scale has been achieved in a GQD-molecular system composite with high transfer efficiency. Our finding suggests a dramatic enhancement of the efficiency of GQD based optoelectronic devices can possibly be a reality.
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Affiliation(s)
- Krishna Mishra
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Debopam Acharjee
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Ayendrila Das
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute (HBNI), Khurda 752050, Odisha, India
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Li B, Hao C, Liu H, Yang H, Zhong K, Zhang M, Sun R. Interaction of graphene oxide with lysozyme:Insights from conformational structure and surface charge investigations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 264:120207. [PMID: 34419829 DOI: 10.1016/j.saa.2021.120207] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 06/26/2021] [Accepted: 07/16/2021] [Indexed: 06/13/2023]
Abstract
Lysozyme (Lyz) is an important antibacterial protein that exists widely in nature. In recent years, the application of graphene oxide (GO) in the field of biotechnology electronics, optics, chemistry and energy storage has been extensively studied. However, due to the unique properties of GO, the mechanism of its interaction with biomacromolecule proteins is very complex. To further explore the interaction between GO and proteins we explore the influence of different pH and heat treatment conditions on the interaction between GO and Lyz, the GO (0-20 μg/mL) was added at a fixed Lyz concentration (0.143 mg/mL) under different pHs. The structure and surface charge changes of Lyz were measured by spectroscopic analysis and zeta potential. The results showed that the interaction between GO and Lyz depends on temperature and pH, significant changes have taken place in its tertiary and secondary structures. By analyzing the UV absorption spectrum, it was found that lysozyme and GO formed a stable complex, and the conformation of the enzyme was changed. In acidic pH conditions (i.e., pH < pI), a high density of Lyz were found to adsorb on the GO surface, whereas an increase in pH resulted in a progressive decrease in the density of the adsorbed Lyz. This pH-dependent adsorption is ascribed to the electrostatic interactions between the negatively charged GO surface and the tunable ionization of the Lyz molecules. The secondary structure of Lyz adsorbed on GO was also found to be highly dependent on the pH. In this paper, we investigated the exact mechanism of pH-influenced GO binding to lysozyme, which has important guidance significance for the potential toxicity of GO biology and its applications in biomedical fields such as structure-based drug design.
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Affiliation(s)
- Binbin Li
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Changchun Hao
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.
| | - Hengyu Liu
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Haiyan Yang
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Kunfeng Zhong
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
| | - Mingduo Zhang
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.
| | - Runguang Sun
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
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5
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Pal T, Sahu K. Photophysical characterization of a sub-micellar triblock copolymer-cationic surfactant aggregate for nanostructure synthesis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY 2021. [DOI: 10.1016/j.jpap.2021.100066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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6
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Mishra K, Acharjee D, Das A, Ghosh S. Femtosecond Upconversion Study of Interfacial Electron Transfer from Photoexcited CsPbBr 3 Perovskite Nanocrystal to Rhodamine 6G. J Phys Chem B 2021; 125:11017-11025. [PMID: 34583511 DOI: 10.1021/acs.jpcb.1c05354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photoinduced electron transfer (PET) from an excited-state CsPbBr3 nanocrystal (NC) to rhodamine 6G (r6G) is studied in toluene using different fluorescence-based techniques. Because of weak solubility of r6G in toluene, excess r6G molecules adsorb at NC surface which result in a much slower rotational diffusion time scale of r6G in the presence of NCs. Study of intrinsic PET benefits from the soft molecular interactions leading to donor (NC)-acceptor (r6G) complex formation, where solvent diffusion parameters would not play any role in the PET kinetics. Femtosecond transients of NCs are nicely fit to a Poisson expression originally proposed by Tachiya. Conclusive fittings to the temperature dependence quenching data reveal two interesting observations: (1) Even though the average number of surface trap state in a NC does not change with temperature (5-60 °C), the trap-state-induced quenching time scale is accelerated with increase in temperature, pointing toward a more efficient trapping at higher temperature. (ii) In the presence of r6G, a fast (∼150 ps per r6G molecule) interfacial PET time scale is observed, which remains unaffected by temperature (5-60 °C). Our findings demonstrate that even a simple "perovskite NC-electron acceptor" composite like that in the present study can ensure a rapid interfacial charge separation. Such information will help us to realize the actual potential of perovskites NCs in their real applications.
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Affiliation(s)
- Krishna Mishra
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Debopam Acharjee
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Ayendrila Das
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
| | - Subhadip Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Jatni, Khurda, Odisha 752050, India
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7
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Khan Z, Al-Thabaiti SA. Interaction of CTAB capped gold@iron bimetallic nanomaterials with bovine serum albumin: A multi-technique approach. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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8
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Biswas P, Adhikari A, Pal U, Singh P, Das M, Saha-Dasgupta T, Choudhury SS, Das R, Pal SK. Flexibility modulates the catalytic activity of a thermostable enzyme: key information from optical spectroscopy and molecular dynamics simulation. SOFT MATTER 2020; 16:3050-3062. [PMID: 32133476 DOI: 10.1039/c9sm02479d] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Enzymes are dynamical macromolecules and their conformation can be altered via local fluctuations of side chains, large scale loop and even domain motions which are intimately linked to their function. Herein, we have addressed the role of dynamic flexibility in the catalytic activity of a thermostable enzyme almond beta-glucosidase (BGL). Optical spectroscopy and classical molecular dynamics (MD) simulation were employed to study the thermal stability, catalytic activity and dynamical flexibility of the enzyme. An enzyme assay reveals high thermal stability and optimum catalytic activity at 333 K. Polarization-gated fluorescence anisotropy measurements employing 8-anilino-1-napthelenesulfonic acid (ANS) have indicated increasing flexibility of the enzyme with an increase in temperature. A study of the atomic 3D structure of the enzyme shows the presence of four loop regions (LRs) strategically placed over the catalytic barrel as a lid. MD simulations have indicated that the flexibility of BGL increases concurrently with temperature through different fluctuating characteristics of the enzyme's LRs. Principal Component Analysis (PCA) and the Steered Molecular Dynamics (SMD) simulation manifest the gatekeeper role of the four LRs through their dynamic fluctuations surrounding the active site which controls the catalytic activity of BGL.
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Affiliation(s)
- Pritam Biswas
- Department of Microbiology, St. Xavier's College, 30, Mother Teresa Sarani, Kolkata 700016, India.
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9
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Das S, Singh AK, Biswas DS, Datta A. Dynamics of Preferential Solvation of 5-Aminoquinoline in Hexane–Alcohol Solvent Mixtures. J Phys Chem B 2019; 123:10267-10274. [DOI: 10.1021/acs.jpcb.9b09143] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sharmistha Das
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Avinash Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Deep Sekhar Biswas
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Anindya Datta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
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10
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Pal T, Sahu K. Anomalous Variation of Excited-State Proton Transfer Dynamics inside a Triblock Copolymer–Cationic Surfactant Mixed Micelle. J Phys Chem B 2019; 123:8559-8568. [DOI: 10.1021/acs.jpcb.9b06575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Tapas Pal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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11
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Nandy A, Chakraborty S, Nandi S, Bhattacharyya K, Mukherjee S. Structure, Activity, and Dynamics of Human Serum Albumin in a Crowded Pluronic F127 Hydrogel. J Phys Chem B 2019; 123:3397-3408. [DOI: 10.1021/acs.jpcb.9b00219] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Atanu Nandy
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Subhajit Chakraborty
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Somen Nandi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Kankan Bhattacharyya
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
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12
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Chakraborty B, Sengupta C, Pal U, Basu S. Acridone in a biological nanocavity: detailed spectroscopic and docking analyses of probing both the tryptophan residues of bovine serum albumin. NEW J CHEM 2017. [DOI: 10.1039/c7nj02454a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
AD initially gets hooked to Trp 212 housed in domain IIA, inducing conformational changes in the protein and paving the way for the ligand to reach Trp 134 located in domain IB.
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Affiliation(s)
| | | | - Uttam Pal
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
| | - Samita Basu
- Chemical Sciences Division
- Saha Institute of Nuclear Physics
- Kolkata
- India
- Homi Bhaba National Institute
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13
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Biswas S, Mukherjee SK, Chowdhury PK. Crowder-Induced Rigidity in a Multidomain Protein: Insights from Solvation. J Phys Chem B 2016; 120:12501-12510. [DOI: 10.1021/acs.jpcb.6b10478] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Saikat Biswas
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Sanjib Kumar Mukherjee
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Pramit Kumar Chowdhury
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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14
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Phukon A, Ray S, Sahu K. Effect of Cosurfactants on the Interfacial Hydration of CTAB Quaternary Reverse Micelle Probed Using Excited State Proton Transfer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10659-10667. [PMID: 27666561 DOI: 10.1021/acs.langmuir.6b02869] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
It has been proven previously that the negatively charged photoacid 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS) resides at the interface of the cationic reverse micelle (RM) cetyltrimethylammonium bromide (CTAB)/octanol/water/cyclohexane and is a potential reporter of hydration through the excited state proton transfer (ESPT) process. However, the ESPT dynamics monitored by the pump-probe study was limited to the ultrafast timescale and hence did not report any discernible ESPT signature. Herein, we reinvestigate the ESPT behavior using fluorescence spectroscopy in the nanosecond timescale and at different values of w0 (=[water]/[surfactant]). We clearly observed distinct w0-dependent ESPT signatures analogous to conventional ternary cationic RMs implying considerable interfacial hydration. The results agree with a recent molecular simulation study, where significant penetration of water molecules into the interface was predicted for the CTAB quaternary RM. Moreover, we also found that the ESPT dynamics and the fluorescence anisotropy decay of HPTS depend differentially on the octanol/CTAB ratio (p0). The ESPT process was found to be disfavored, whereas the anisotropy decay accelerates upon the increase in p0 values. Our analysis indicates that with the increase in the octanol concentration, dehydrated regions enrich gradually at the interface. However, the increase in octanol concentration may reduce the effective electrostatic potential experienced by the probe and thus may result in faster rotational relaxation.
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Sudipta Ray
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
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15
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Zhang P, Li L, Zhao Y, Tian Z, Qin Y, Lu J. 8-Anilino-1-naphthalenesulfonate/Layered Double Hydroxide Ultrathin Films: Small Anion Assembly and Its Potential Application as a Fluorescent Biosensor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9015-9022. [PMID: 27513829 DOI: 10.1021/acs.langmuir.6b01980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The fluorescent dye 8-anilino-1-naphthalenesulfonate (ANS) is a widely used fluorescent probe molecule for biochemistry analysis. This paper reported the fabrication of ANS/layered double hydroxide nanosheets (ANS/LDH)n ultrathin films (UTFs) via the layer-by-layer small anion assembly technique based on electrostatic interaction and two possible weak interactions: hydrogen-bond and induced electrostatic interactions between ANS and positive-charged LDH nanosheets. The obtained UTFs show a long-range-ordered periodic layered stacking structure and weak fluorescence in dry air or water, but it split into three narrow strong peaks in a weak polarity environment induced by the two-dimensional (2D) confinement effect of the LDH laminate; the fluorescence intensity increases with decreasing the solvent polarity, concomitant with the blue shift of the emission peaks, which show good sensoring reversibility. Meanwhile, the UTFs exhibit selective fluorescence enhancement to the bovine serum albumin (BSA)-like protein biomolecules, and the rate of fluorescence enhancement with the protein concentration is significantly different with the different protein aggregate states. The (ANS/LDH)n UTF has the potential to be a novel type of biological flourescence sensor material.
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Affiliation(s)
- Ping Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Ling Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Yun Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Zeyun Tian
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Yumei Qin
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Jun Lu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
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Phukon A, Ray S, Sahu K. How Does Interfacial Hydration Alter during Rod to Sphere Transition in DDAB/Water/Cyclohexane Reverse Micelles? Insights from Excited State Proton Transfer and Fluorescence Anisotropy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6656-6665. [PMID: 27292367 DOI: 10.1021/acs.langmuir.6b01254] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
How does microscopic organization of an organized assembly alter during macroscopic structural transition? The question may be important to ascertain driving forces responsible for such transitions. Didodecyldimethylammonium bromide (DDAB)/water/cyclohexane reverse micelle is an attractive assembly that undergoes structural transition from rod to spherical shape when the amount of water loading, w0 ([water]/[surfactant]), exceeds a particular value (w0 ∼ 8). Here, we intend to investigate the effect of the morphological change upon interfacial hydration using steady-state and time-resolved fluorescence measurements. The anionic fluorophore 8-hydroxypyrene-1,3,6-trisulfonate (HPTS or pyranine) is expected to be trapped within the positively charged RM interface. The fluorophore can undergo excited-state proton transfer (ESPT) in the presence of water and, thus, is able to provide insight on the level of hydration within the interface. The ESPT process is markedly inhibited within the interface at low w0 and gradually favored with increase of w0. The time-resolved fluorescence decays could be best analyzed by assuming distribution of HPTS over two distinct interfacial regions- partly hydrated and mostly dehydrated. The relative population of the two regions varies distinctly at low w0 (<6) and high w0 (>6) regimes. Moreover, fluorescence anisotropy (steady-state and time-resolved) varies differently with respect to w0, before and after the transition point (w0 ∼ 8).
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Sudipta Ray
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
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17
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Jana B, Mohapatra S, Mondal P, Barman S, Pradhan K, Saha A, Ghosh S. α-Cyclodextrin Interacts Close to Vinblastine Site of Tubulin and Delivers Curcumin Preferentially to the Tubulin Surface of Cancer Cell. ACS APPLIED MATERIALS & INTERFACES 2016; 8:13793-13803. [PMID: 27228201 DOI: 10.1021/acsami.6b03474] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Tubulin is the key cytoskeleton component, which plays a crucial role in eukaryotic cell division. Many anticancer drugs have been developed targeting the tubulin surface. Recently, it has been shown that few polyhydroxy carbohydrates perturb tubulin polymerization. Cyclodextrin (CD), a polyhydroxy carbohydrate, has been extensively used as the delivery vehicle for delivery of hydrophobic drugs to the cancer cell. However, interaction of CD with intracellular components has not been addressed before. In this Article, we have shown for the first time that α-CD interacts with tubulin close to the vinblastine site using molecular docking and Förster resonance energy transfer (FRET) experiment. In addition, we have shown that α-CD binds with intracellular tubulin/microtubule. It delivers a high amount of curcumin onto the cancer cell, which causes severe disruption of intracellular microtubules. Finally, we have shown that the inclusion complex of α-CD and curcumin (CCC) preferentially enters into the human lung cancer cell (A549) as compared to the normal lung fibroblast cell (WI38), causes apoptotic death, activates tumor suppressor protein (p53) and cyclin-dependent kinase inhibitor 1 (p21), and inhibits 3D spheroid growth of cancer cell.
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Affiliation(s)
- Batakrishna Jana
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Saswat Mohapatra
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Prasenjit Mondal
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Surajit Barman
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Krishnangsu Pradhan
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Abhijit Saha
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Surajit Ghosh
- Organic & Medicinal Chemistry Division, and ‡Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
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18
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Mallick S, Pal K, Koner AL. Probing microenvironment of micelle and albumin using diethyl 6-(dimethylamino)naphthalene-2,3-dicarboxylate: An electroneutral solvatochromic fluorescent probe. J Colloid Interface Sci 2016; 467:81-89. [DOI: 10.1016/j.jcis.2015.12.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 12/08/2015] [Accepted: 12/11/2015] [Indexed: 11/15/2022]
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19
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Yadav R, Sengupta B, Sen P. Effect of sucrose on chemically and thermally induced unfolding of domain-I of human serum albumin: Solvation dynamics and fluorescence anisotropy study. Biophys Chem 2016; 211:59-69. [PMID: 26930029 DOI: 10.1016/j.bpc.2016.02.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 02/16/2016] [Accepted: 02/17/2016] [Indexed: 12/12/2022]
Abstract
The present study is devoted to understand the effect of sucrose on the hydration dynamics and rotational relaxation dynamics within the domain-I of HSA during chemically as well as thermally induced unfolding. It has been observed that the average solvation time become slower in the presence of sucrose for the lower concentrations of GnHCl, however at higher concentrations of GnHCl the effect of sucrose is almost negligible. From the time resolved fluorescence anisotropy it has been observed that in the lower concentration region of GnHCl the sucrose induced stabilization is small as compared to the higher concentrations of GnHCl. We have concluded that the hydration dynamics plays an important role in the sucrose induced stabilization process at the low concentration region; whereas environmental restriction is responsible at the higher concentration of GnHCl. However, we have observed a negligible stabilizing effect of sucrose towards the temperature induced unfolding.
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Affiliation(s)
- Rajeev Yadav
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, UP, India
| | - Bhaswati Sengupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, UP, India
| | - Pratik Sen
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, UP, India.
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20
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Phukon A, Barman N, Sahu K. Wet Interface of Benzylhexadecyldimethylammonium Chloride Reverse Micelle Revealed by Excited State Proton Transfer of a Localized Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12587-12596. [PMID: 26540303 DOI: 10.1021/acs.langmuir.5b03632] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Excited state proton transfer (ESPT) of an anionic photoacid 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS or pyranine) has been studied inside a cationic reverse micelle (RM), water/benzylhexadecyldimethylammonium chloride (BHDC)/benzene, using steady-state and time-resolved fluorescence spectroscopy. The observed ESPT behavior is found to be remarkably different from the known ESPT trend of HPTS inside anionic AOT and cationic CTAB RMs; the ESPT dynamics approaches that of bulk water at higher w0 (≥10) inside AOT RM while no ESPT was observed for CTAB reverse micelle [ Sedgwick J. Am. Chem. Soc. 2012 , 134 , 11904 - 11907 ]. The ESPT dynamics inside BHDC RM is remarkably slower compared to that of water at all w0 (= [water]/[surfactant]) values and relatively much less sensitive to w0 variation compared to AOT RM. 2D NOESY and fluorescence anisotropy measurements reveal that the probe (HPTS) is embedded inside the positive interface of BHDC RM. Despite its trapped location, HPTS is able to undergo ESPT due to significant penetration of water molecules into the interface. Furthermore, facile ESPT at higher w0 is consistent with higher degree of interface hydration as predicted by a recent MD simulation [ Agazzi Langmuir 2014 , 30 , 9643 - 9653 ]. The study shows that ESPT dynamics inside RM varies not only with the interface charge but also on the nature of the headgroup and solvation.
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Nabajeet Barman
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
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21
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Mukherjee SK, Gautam S, Biswas S, Kundu J, Chowdhury PK. Do Macromolecular Crowding Agents Exert Only an Excluded Volume Effect? A Protein Solvation Study. J Phys Chem B 2015; 119:14145-56. [DOI: 10.1021/acs.jpcb.5b09446] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sanjib K. Mukherjee
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Saurabh Gautam
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Saikat Biswas
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Jayanta Kundu
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Pramit K. Chowdhury
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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22
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Martin DR, Matyushov DV. Hydration shells of proteins probed by depolarized light scattering and dielectric spectroscopy: orientational structure is significant, positional structure is not. J Chem Phys 2015; 141:22D501. [PMID: 25494772 DOI: 10.1063/1.4895544] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Water interfacing hydrated proteins carry properties distinct from those of the bulk and is often described as a separate entity, a "biological water." We address here the question of which dynamical and structural properties of hydration water deserve this distinction. The study focuses on different aspects of the density and orientational fluctuations of hydration water and the ability to separate them experimentally by combining depolarized light scattering with dielectric spectroscopy. We show that the dynamics of the density fluctuations of the hydration shells reflect the coupled dynamics of the solute and solvent and do not require a special distinction as "biological water." The orientations of shell water molecules carry dramatically different physics and do require a separation into a sub-ensemble. Depending on the property considered, the perturbation of water's orientational structure induced by the protein propagates 3-5 hydration shells into the bulk at normal temperature.
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Affiliation(s)
- Daniel R Martin
- Department of Physics, Arizona State University, PO Box 871504, Tempe, Arizona 85287-1504, USA
| | - Dmitry V Matyushov
- Department of Physics and Department of Chemistry and Biochemistry, Arizona State University, PO Box 871504, Tempe, Arizona 85287-1504, USA
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23
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Application of Partial Least Square (PLS) Analysis on Fluorescence Data of 8-Anilinonaphthalene-1-Sulfonic Acid, a Polarity Dye, for Monitoring Water Adulteration in Ethanol Fuel. J Fluoresc 2015; 25:1055-61. [PMID: 26104105 DOI: 10.1007/s10895-015-1592-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 06/04/2015] [Indexed: 10/23/2022]
Abstract
Fluorescence characteristic of 8-anilinonaphthalene-1-sulfonic acid (ANS) in ethanol-water mixture in combination with partial least square (PLS) analysis was used to propose a simple and sensitive analytical procedure for monitoring the adulteration of ethanol by water. The proposed analytical procedure was found to be capable of detecting even small adulteration level of ethanol by water. The robustness of the procedure is evident from the statistical parameters such as square of correlation coefficient (R(2)), root mean square of calibration (RMSEC) and root mean square of prediction (RMSEP) that were found to be well with in the acceptable limits.
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24
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Wazawa T, Morimoto N, Nagai T, Suzuki M. Rotational motion of rhodamine 6G tethered to actin through oligo(ethylene glycol) linkers studied by frequency-domain fluorescence anisotropy. Biophys Physicobiol 2015; 12:87-102. [PMID: 27493858 PMCID: PMC4736842 DOI: 10.2142/biophysico.12.0_87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 11/02/2015] [Indexed: 12/01/2022] Open
Abstract
Investigation of the rotational motion of a fluorescent probe tethered to a protein helps to elucidate the local properties of the solvent and protein near the conjugation site of the probe. In this study, we have developed an instrument for frequency-domain fluorescence (FDF) anisotropy measurements, and studied how the local properties around a protein, actin, can be elucidated from the rotational motion of a dye tethered to actin. Rhodamine 6G (R6G) was attached to Cys-374 using newly-synthesized R6G-maleimide with three different oligo(ethylene glycol) (OEG) linker lengths. The time-resolved anisotropy decay of R6G tethered to G-actin was revealed to be a combination of the two modes of the wobbling motion of R6G and the tumbling motion of G-actin. The rotational diffusion coefficient (RDC) of R6G wobbling was ~0.1 ns−1 at 20°C and increased with OEG linker length. The use of the three R6G-actin conjugates of different linker lengths was useful to not only figure out the linker length dependence of the rotational motion of R6G but also validate the analyses. In the presence of a cosolvent of glycerol, although the tumbling motion of G-actin was retarded in response to the bulk viscosity, the wobbling motion of R6G tethered to actin exhibited an increase of RDC as glycerol concentration increased. This finding suggests an intricate relationship between the fluid properties of the bulk solvent and the local environment around actin.
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Affiliation(s)
- Tetsuichi Wazawa
- Department of Biomolecular Science and Engineering, Institute for Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan; Department of Materials Processing, Graduate School of Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - Nobuyuki Morimoto
- Department of Materials Processing, Graduate School of Tohoku University, Sendai, Miyagi 980-8579, Japan
| | - Takeharu Nagai
- Department of Biomolecular Science and Engineering, Institute for Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Makoto Suzuki
- Department of Materials Processing, Graduate School of Tohoku University, Sendai, Miyagi 980-8579, Japan
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25
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26
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Fluorescence probing of the local environment in a hydrogel: TICT and photoisomerization in chitosan hydrogel beads. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Yadav R, Sengupta B, Sen P. Conformational Fluctuation Dynamics of Domain I of Human Serum Albumin in the Course of Chemically and Thermally Induced Unfolding Using Fluorescence Correlation Spectroscopy. J Phys Chem B 2014; 118:5428-38. [DOI: 10.1021/jp502762t] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rajeev Yadav
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Bhaswati Sengupta
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Pratik Sen
- Department
of Chemistry Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
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28
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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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29
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Abstract
Electron transfer between redox proteins participating in energy chains of biology is required to proceed with high energetic efficiency, minimizing losses of redox energy to heat. Within the standard models of electron transfer, this requirement, combined with the need for unidirectional (preferably activationless) transitions, is translated into the need to minimize the reorganization energy of electron transfer. This design program is, however, unrealistic for proteins whose active sites are typically positioned close to the polar and flexible protein-water interface to allow inter-protein electron tunneling. The high flexibility of the interfacial region makes both the hydration water and the surface protein layer act as highly polar solvents. The reorganization energy, as measured by fluctuations, is not minimized, but rather maximized in this region. Natural systems in fact utilize the broad breadth of interfacial electrostatic fluctuations, but in the ways not anticipated by the standard models based on equilibrium thermodynamics. The combination of the broad spectrum of static fluctuations with their dispersive dynamics offers the mechanism of dynamical freezing (ergodicity breaking) of subsets of nuclear modes on the time of reaction/residence of the electron at a redox cofactor. The separation of time-scales of nuclear modes coupled to electron transfer allows dynamical freezing. In particular, the separation between the relaxation time of electro-elastic fluctuations of the interface and the time of conformational transitions of the protein caused by changing redox state results in dynamical freezing of the latter for sufficiently fast electron transfer. The observable consequence of this dynamical freezing is significantly different reorganization energies describing the curvature at the bottom of electron-transfer free energy surfaces (large) and the distance between their minima (Stokes shift, small). The ratio of the two reorganization energies establishes the parameter by which the energetic efficiency of protein electron transfer is increased relative to the standard expectations, thus minimizing losses of energy to heat. Energetically efficient electron transfer occurs in a chain of conformationally quenched cofactors and is characterized by flattened free energy surfaces, reminiscent of the flat and rugged landscape at the stability basin of a folded protein.
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Affiliation(s)
- Dmitry V Matyushov
- Center for Biological Physics, Arizona State University, PO Box 871504, Tempe, Arizona 85287-1504, USA.
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30
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Ghosh S, Kundu P, Paul BK, Chattopadhyay N. Binding of an anionic fluorescent probe with calf thymus DNA and effect of salt on the probe–DNA binding: a spectroscopic and molecular docking investigation. RSC Adv 2014. [DOI: 10.1039/c4ra14298e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Binding mode of biologically relevant anionic probe, ANS, with ctDNA is divulged from spectroscopic and molecular docking studies.
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Affiliation(s)
- Saptarshi Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata – 700032, India
| | - Pronab Kundu
- Department of Chemistry
- Jadavpur University
- Kolkata – 700032, India
| | - Bijan Kumar Paul
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal 462066, India
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31
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Posey LA, Hendricks RJ, Beck WF. Dynamic Stokes Shift of the Time-Resolved Phosphorescence Spectrum of ZnII-Substituted Cytochrome c. J Phys Chem B 2013; 117:15926-34. [DOI: 10.1021/jp405611w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lynmarie A. Posey
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Ryan J. Hendricks
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Warren F. Beck
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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32
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Tripathy J, Mueller JJ, Shepherd NC, Beck WF. Dynamic solvation and coupling of the hydration shell of Zn(II)-substituted cytochrome c in the presence of guanidinium ions. J Phys Chem B 2013; 117:14589-98. [PMID: 24237324 DOI: 10.1021/jp404554t] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The fluorescence Stokes shift (FSS) response of Zn(II)-substituted cytochrome c (ZnCytc) is transformed from a monotonic red-shifting response in water to a bidirectional response with much slower time constants in the presence of low concentrations of guanidinium (Gdm(+)) ions. The FSS response in water observed over the 100 ps to 10 ns range has two exponential components with time constants of 135 ps and 1.6 ns that account for a total shift of 30 cm(-1), about one-half of the solvation reorganization energy. In contrast, in the presence of only 0.25 M Gdm(+), the FSS response initially shifts 21 cm(-1) to the blue with a 820 ps time constant and then shifts 60 cm(-1) back to the red with a 3.5 ns time constant. The effect of Gdm(+) on the FSS response effectively saturates at 1.0 M, well below the 1.75 M midpoint of the two-state unfolding transition. These results establish that the FSS response in ZnCytc includes a significant contribution from the surrounding hydration shell, which assumes a perturbed hydrogen-bonding network owing to the binding of Gdm(+) ions to the protein surface. The blue-shifting part of the FSS response arises from a light-induced conformational change that expands the protein- and solvent-derived cavity around the excited-state Zn(II) porphyrin. This non-polar part of the solvation response is enhanced in the presence of Gdm(+) because the protein/solvent surroundings of the Zn(II) porphyrin are effectively more flexible than in water. The enhanced flexibility in the presence of Gdm(+) increases the amplitudes and accordingly lengthens the correlation time scales for the protein and hydration-shell fluctuations that contribute to the FSS response.
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Affiliation(s)
- Jagnyaseni Tripathy
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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33
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Sturlaugson AL, Arima AY, Bailey HE, Fayer MD. Orientational Dynamics in a Lyotropic Room Temperature Ionic Liquid. J Phys Chem B 2013; 117:14775-84. [DOI: 10.1021/jp407325b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adam L. Sturlaugson
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Aaron Y. Arima
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Heather E. Bailey
- 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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34
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Rakshit S, Saha R, Pal SK. Modulation of Environmental Dynamics at the Active Site and Activity of an Enzyme under Nanoscopic Confinement: Subtilisin Carlsberg in Anionic AOT Reverse Micelle. J Phys Chem B 2013; 117:11565-74. [DOI: 10.1021/jp4061494] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Surajit Rakshit
- Department of Chemical, Biological,
and Macromolecular Sciences, S.N. Bose National Centre for Basic Sciences, Block JD,
Sector III, Salt Lake, Kolkata 700098, India
| | - Ranajay Saha
- Department of Chemical, Biological,
and Macromolecular Sciences, S.N. Bose National Centre for Basic Sciences, Block JD,
Sector III, Salt Lake, Kolkata 700098, India
| | - Samir Kumar Pal
- Department of Chemical, Biological,
and Macromolecular Sciences, S.N. Bose National Centre for Basic Sciences, Block JD,
Sector III, Salt Lake, Kolkata 700098, India
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35
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Mohapatra M, Mishra AK. Photophysical behavior of 8-anilino-1-naphthalenesulfonate in vesicles of pulmonary surfactant dipalmitoylphosphatidylcholine (DPPC) and its sensitivity toward the bile salt-vesicle interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11396-11404. [PMID: 23930911 DOI: 10.1021/la402355j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The photophysical behavior of 8-anilino-1-naphthalenesulphonate (ANS) in vesicles of dipalmitoylphosphatidylcholine (DPPC), a pulmonary surfactant, has been carried out in a detailed manner. ANS shows notable variations in fluorescence intensity, lifetime, and anisotropy parameters as it gets into the vesicle. It was found that ANS partitions well into the DPPC bilayer membrane with an estimated partition coefficient of ~2.0 × 10(5). Among the various fluorescence parameters of ANS, fluorescence anisotropy was found to be most responsive to the temperature induced phase change of the bilayer membrane. These interesting fluorescence parameters of ANS were then used to study the hydration of lipid bilayer membrane by submicellar concentration of bile salts. From the steady-state fluorescence intensity and dynamic fluorescence lifetime analyses it is clear that ANS is able to probe the submicellar concentration (≤1 mM) of bile salt induced hydration of lipid bilayer membrane that accompanies expulsion of ANS from the bilayer to the aqueous bulk phase. Lower-temperature shift in the phase transition of DPPC bilayer indicates that fluorescence anisotropy of ANS is sensitive enough to the bile salt induced perturbation in the packed acyl chains of DPPC bilayer and modification in the membrane fluidity. In presence of sodium deoxycholate (NaDC) and sodium cholate (NaC) in DPPC vesicles, ANS experiences restriction in rotational mobility which is evident from the variation in steady-state fluorescence anisotropy and fluorescence anisotropy decay parameters.
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Affiliation(s)
- Monalisa Mohapatra
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
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36
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Pan A, Mati SS, Naskar B, Bhattacharya SC, Moulik SP. Self-Aggregation of MEGA-9 (N-Nonanoyl-N-methyl-d-glucamine) in Aqueous Medium: Physicochemistry of Interfacial and Solution Behaviors with Special Reference to Formation Energetics and Micelle Microenvironment. J Phys Chem B 2013; 117:7578-92. [DOI: 10.1021/jp400139d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Animesh Pan
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Soumya Sundar Mati
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Bappaditya Naskar
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | | - Satya Priya Moulik
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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37
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Fuentealba D, Kato H, Nishijima M, Fukuhara G, Mori T, Inoue Y, Bohne C. Explaining the Highly Enantiomeric Photocyclodimerization of 2-Anthracenecarboxylate Bound to Human Serum Albumin Using Time-Resolved Anisotropy Studies. J Am Chem Soc 2012; 135:203-9. [DOI: 10.1021/ja3081555] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Denis Fuentealba
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British
Columbia, Canada V8W 3 V6
| | | | | | | | | | | | - Cornelia Bohne
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British
Columbia, Canada V8W 3 V6
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38
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Chowdhury R, Mojumdar SS, Chattoraj S, Bhattacharyya K. Effect of ionic liquid on the native and denatured state of a protein covalently attached to a probe: Solvation dynamics study. J Chem Phys 2012; 137:055104. [DOI: 10.1063/1.4739922] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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39
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Sturlaugson AL, Fruchey KS, Fayer MD. Orientational Dynamics of Room Temperature Ionic Liquid/Water Mixtures: Water-Induced Structure. J Phys Chem B 2012; 116:1777-87. [DOI: 10.1021/jp209942r] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adam L. Sturlaugson
- Department of Chemistry, Stanford University, Stanford, California 94305, United
States
| | - Kendall S. Fruchey
- 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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40
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41
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Verma PK, Rakshit S, Mitra RK, Pal SK. Role of hydration on the functionality of a proteolytic enzyme α-chymotrypsin under crowded environment. Biochimie 2011; 93:1424-33. [DOI: 10.1016/j.biochi.2011.04.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 04/20/2011] [Indexed: 11/28/2022]
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42
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Matyushov DV. Nanosecond Stokes Shift Dynamics, Dynamical Transition, and Gigantic Reorganization Energy of Hydrated Heme Proteins. J Phys Chem B 2011; 115:10715-24. [DOI: 10.1021/jp200409z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Dmitry V. Matyushov
- Center for Biological Physics, Arizona State University, P.O. Box 871504, Tempe, Arizona 85287-1504, United States
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Das DK, Mondal T, Mandal U, Bhattacharyya K. Probing deuterium isotope effect on structure and solvation dynamics of human serum albumin. Chemphyschem 2011; 12:814-22. [PMID: 21341353 DOI: 10.1002/cphc.201000912] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 01/18/2011] [Indexed: 12/20/2022]
Abstract
The deuterium isotopic effect on the structure and solvation dynamics of the protein, human serum albumin (HSA), has been studied by using circular dichroism (CD), femtosecond up-conversion, FRET, and single-molecule spectroscopy. The CD spectra suggest that D(2)O affects the structure of HSA, leading to a 20% decrease in the helical structure. The FRET study indicates that the distance of C153 from the lone tryptophan residue of HSA is quite similar (≈21 Å) in H(2)O and D(2)O, and hence, the location of the probe in the protein remains the same in the two solvents. The single-molecule study suggests that coumarin 153 (C153) binds almost exclusively (>96%) to one site of HSA. Solvation dynamics of C153 in HSA is found to be markedly retarded in D(2)O compared with H(2)O. In H(2)O, the solvation of C153 bound to HSA is found to be biexponential with one component of 7 ps (30%) and a long component of 350 ps (70%). In D(2)O, we detected a short component of 4 ps (41%) and a long component of 950 ps (59%). Thus, the ultraslow component of the solvation dynamics of C153 bound to HSA in D(2)O (950 ps) is 2.5-fold slower than that in H(2)O (350 ps). The marked deuterium isotope effect has been ascribed to water molecules confined in the protein environment and to a lesser extent to the structural modification of protein by D(2)O.
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Affiliation(s)
- Dibyendu Kumar Das
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Tripathy J, Beck WF. Nanosecond-Regime Correlation Time Scales for Equilibrium Protein Structural Fluctuations of Metal-Free Cytochrome c from Picosecond Time-Resolved Fluorescence Spectroscopy and the Dynamic Stokes Shift. J Phys Chem B 2010; 114:15958-68. [DOI: 10.1021/jp1044964] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jagnyaseni Tripathy
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
| | - Warren F. Beck
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
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Hawe A, Poole R, Jiskoot W. Misconceptions over Förster resonance energy transfer between proteins and ANS/bis-ANS: Direct excitation dominates dye fluorescence. Anal Biochem 2010; 401:99-106. [PMID: 20197057 DOI: 10.1016/j.ab.2010.02.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2009] [Revised: 02/23/2010] [Accepted: 02/25/2010] [Indexed: 11/30/2022]
Abstract
Our aim was to disprove the widespread misconception that Förster resonance energy transfer (FRET) is the only explanation for observing fluorescence from ANS (8-anilino-1-naphthalenesulfonic acid) and bis-ANS (4,4'-dianilino-1,1'-binaphthyl-5,5'-disulfonic acid, dipotassium salt) following excitation at 280nm in the presence of protein. From ultraviolet (UV) absorption spectra and fluorescence emission spectra of bis-ANS and ANS in buffer and ethanol, direct excitation at 280nm was found to be the dominant mechanism for the resulting dye fluorescence. Furthermore, Tyr/Trp quenching studies were performed for solutions of N-acetyl-l-tryptophanamide, heat-stressed immunoglobulin G (IgG), and bovine serum albumin (BSA) by monitoring changes in steady state fluorescence spectra and time-resolved fluorescence decays as a function of dye concentration. Stronger quenching of the intrinsic BSA and IgG fluorescence in steady state than in time-resolved fluorescence by bis-ANS and ANS pointed toward static quenching being the dominant mechanism in addition to dynamic quenching and/or FRET. In conclusion, one should consider the role of direct excitation of ANS and bis-ANS at 280nm to ensure a proper interpretation of fluorescence signals resulting from dye-protein interactions. When ANS or bis-ANS is to be used for protein characterization, we recommend selectively exciting the dyes at the higher absorption wavelength maximum (370 or 385nm, respectively).
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Affiliation(s)
- Andrea Hawe
- Division of Drug Delivery Technology, Leiden/Amsterdam Center for Drug Research, Leiden University, 2300 RA Leiden, The Netherlands.
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Mondal SK, Sahu K, Bhattacharyya K. Study of Biological Assemblies by Ultrafast Fluorescence Spectroscopy. REVIEWS IN FLUORESCENCE 2009. [DOI: 10.1007/978-0-387-88722-7_8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Singh RB, Mahanta S, Bagchi A, Guchhait N. Interaction of human serum albumin with charge transfer probe ethyl ester of N,N-dimethylamino naphthyl acrylic acid: An extrinsic fluorescence probe for studying protein micro-environment. Photochem Photobiol Sci 2009; 8:101-10. [DOI: 10.1039/b814050b] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Study of Protein–Probe Interaction and Protective Action of Surfactant Sodium Dodecyl Sulphate in Urea-Denatured HSA using Charge Transfer Fluorescence Probe Methyl Ester of N,N-Dimethylamino Naphthyl Acrylic Acid. J Fluoresc 2008; 19:291-302. [DOI: 10.1007/s10895-008-0415-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2008] [Accepted: 08/20/2008] [Indexed: 10/21/2022]
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Mandal U, Ghosh S, Mitra G, Adhikari A, Dey S, Bhattacharyya K. A Femtosecond Study of the Interaction of Human Serum Albumin with a Surfactant (SDS). Chem Asian J 2008; 3:1430-4. [DOI: 10.1002/asia.200800114] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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LeBard DN, Kapko V, Matyushov DV. Energetics and kinetics of primary charge separation in bacterial photosynthesis. J Phys Chem B 2008; 112:10322-42. [PMID: 18636767 DOI: 10.1021/jp8016503] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We report the results of molecular dynamics (MD) simulations and formal modeling of the free-energy surfaces and reaction rates of primary charge separation in the reaction center of Rhodobacter sphaeroides. Two simulation protocols were used to produce MD trajectories. Standard force-field potentials were employed in the first protocol. In the second protocol, the special pair was made polarizable to reproduce a high polarizability of its photoexcited state observed by Stark spectroscopy. The charge distribution between covalent and charge-transfer states of the special pair was dynamically adjusted during the simulation run. We found from both protocols that the breadth of electrostatic fluctuations of the protein/water environment far exceeds previous estimates, resulting in about 1.6 eV reorganization energy of electron transfer in the first protocol and 2.5 eV in the second protocol. Most of these electrostatic fluctuations become dynamically frozen on the time scale of primary charge separation, resulting in much smaller solvation contributions to the activation barrier. While water dominates solvation thermodynamics on long observation times, protein emerges as the major thermal bath coupled to electron transfer on the picosecond time of the reaction. Marcus parabolas were obtained for the free-energy surfaces of electron transfer by using the first protocol, while a highly asymmetric surface was obtained in the second protocol. A nonergodic formulation of the diffusion-reaction electron-transfer kinetics has allowed us to reproduce the experimental results for both the temperature dependence of the rate and the nonexponential decay of the population of the photoexcited special pair.
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Affiliation(s)
- David N LeBard
- Center for Biological Physics, Arizona State University, Tempe, AZ 85287-1604, USA
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