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Kaur R, Shiekh BA, Banipal PK, Banipal TS. Unraveling the binding and micellization behavior of dioctylsulfosuccinate Sodium Salt with vitamin B1 and B6: A physiochemical and computational study. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125324] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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2
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Mitsou E, Kalogianni EP, Georgiou D, Stamatis H, Xenakis A, Zoumpanioti M. Formulation and Structural Study of a Biocompatible Water-in-Oil Microemulsion as an Appropriate Enzyme Carrier: The Model Case of Horseradish Peroxidase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:150-160. [PMID: 30521342 DOI: 10.1021/acs.langmuir.8b03124] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A novel biocompatible water-in-oil microemulsion was developed using nonionic surfactants and was investigated as a potential enzyme delivery system for pharmaceutical applications. The system was composed of isopropyl myristate/polysorbate 80 (Tween 80)/distilled monoglycerides/water/propylene glycol (PG), had a low total surfactant concentration (8.3% w/w), and was able to incorporate approximately 3% w/w aqueous phase containing horseradish peroxidase (HRP). Structural and activity aspects of the system were studied using a variety of techniques such as dynamic light scattering (DLS), electron paramagnetic resonance (EPR), and dynamic interfacial tension. The apparent hydrodynamic diameter of the empty droplets was calculated at about 37 nm. Different enzyme concentrations, ranging from 0.01 to 1.39 μM, were used for both DLS and EPR studies to effectively determine the localization of the macromolecule in the microemulsion. According to the results, for high enzyme concentrations, a participation of HRP in the surfactant monolayer of the microemulsion is evident. The number of reverse micelles in the microemulsion was defined by a theoretical model and was used to clarify how the enzyme concentration affects the number of empty and loaded reverse micelles. To assure that the system allows the enzyme to retain its catalytic activity, an oxidative reaction catalyzed by HRP was successfully carried out with the use of the model substrate 2,2'-azino-bis[3-ethylbenzothiazoline-6-sulfonic acid]. The influence of several parameters such as temperature, pH, and PG concentration was examined to optimize the reaction conditions, and a kinetic study was conducted revealing an ordered-Bi-Bi mechanism. Values of all kinetic parameters were determined. The release of the encapsulated enzyme was studied using an adequate receiver phase, revealing the effectiveness of the proposed microemulsion not only as a microreactor but also as a carrier for therapeutic biomolecules.
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Affiliation(s)
- Evgenia Mitsou
- Institute of Biology, Medicinal Chemistry & Biotechnology , National Hellenic Research Foundation , 48, Vassileos Constantinou Avenue , 11635 Athens , Greece
- Laboratory of Biotechnology, Department of Biological Applications and Technologies , University of Ioannina , 45110 Ioannina , Greece
| | - Eleni P Kalogianni
- Department of Food Technology , Alexander Technological Educational Institute of Thessaloniki , P.O. Box 141, 57400 Thessaloniki , Greece
| | - Despoina Georgiou
- Department of Food Technology , Alexander Technological Educational Institute of Thessaloniki , P.O. Box 141, 57400 Thessaloniki , Greece
| | - Haralambos Stamatis
- Laboratory of Biotechnology, Department of Biological Applications and Technologies , University of Ioannina , 45110 Ioannina , Greece
| | - Aristotelis Xenakis
- Institute of Biology, Medicinal Chemistry & Biotechnology , National Hellenic Research Foundation , 48, Vassileos Constantinou Avenue , 11635 Athens , Greece
| | - Maria Zoumpanioti
- Institute of Biology, Medicinal Chemistry & Biotechnology , National Hellenic Research Foundation , 48, Vassileos Constantinou Avenue , 11635 Athens , Greece
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Anti-proliferative effect of chitosan nanoparticles (extracted from crayfish Procambarus clarkii, Crustacea: Cambaridae) against MDA-MB-231 and SK-BR-3 human breast cancer cell lines. Int J Biol Macromol 2018; 126:478-487. [PMID: 30572045 DOI: 10.1016/j.ijbiomac.2018.12.151] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/05/2018] [Accepted: 12/16/2018] [Indexed: 12/17/2022]
Abstract
Actually, the most common cancer in women is the breast cancer which is the second most widespread cancer overall. In 2018, there were over two million new cases of women breast cancer. Particularly, we tried to extract chitosan from crayfish Procambarus clarkii, Crustacea: Cambaridae, by N-deacetylation of chitin. The chemical structure of chitosan was characterized by Fourier transform infrared (FT-IR) spectroscopy. Also DDA was calculated from FT-IR and ultraviolet spectrophotometry data. Chitosan nanoparticles were prepared using a ball-milling technique. The as-prepared chitosan nanoparticles were characterized by transmission electron microscopy, dynamic light scattering as well as zeta potential. The cytotoxicity of chitosan and its nanoparticles (50 and 100 μg/mL) against human breast cancer (SK BR3 and MDA-MB-231 cell lines) was evaluated. MTT assay asserts the significant inhibitory action of both chitosan and its nanoparticles on the proliferation of human breast cancer cells in vitro. Chitosan nanoparticles had more anti-proliferative effects on MDA-MB-231 and SK-BR-3 cell lines than its corresponding chitosan. Although, chitosan nanoparticles, that has higher DDA, had a higher cytotoxic activity against human breast cancer MDA-MB-231 and SK-BR-3 cell lines in vitro. Eventually, chitosan and its nanoparticles can be considered as a promising natural compounds in human breast cancer treatment.
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Mohan V, Sen P. Elucidation of active site dynamics of papain and the effect of encapsulation within cationic and anionic reverse micelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 200:202-211. [PMID: 29694928 DOI: 10.1016/j.saa.2018.04.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/30/2018] [Accepted: 04/15/2018] [Indexed: 06/08/2023]
Abstract
In this study, steady state, solvation dynamics and rotational dynamics experiments have been carried out on a system of DACIA-tagged papain in bulk water and inside the water pool of cationic (cetyltrimethylammonium bromide, CTAB) and anionic (sodium bis(2-ethylhexyl)sulfosuccinate, AOT) reverse micelles with varying water contents (W0 = 20 to 50). While the absorption and emission maxima and the excited state lifetime did not show any noticeable change with the variation of the size of the reverse micelle, the change in solvation time, Stokes shift, rotational correlation time and residual anisotropy with the change in reverse micellar size were quite revealing. The average solvation time and Stokes shift of papain in bulk water are 0.22 ns and 125 cm-1 respectively, which increase to 0.96 ns and 718 cm-1 while inside CTAB reverse micelle of W0 = 20. The solvation time and Stokes shift values decrease with the increase in the size of reverse micelle, approaching the corresponding values in bulk water when W0 = 50. The solvation time and Stokes shift of the DACIA-tagged papain was found to be high while inside AOT reverse micelle also (0.47 ns and 438 cm-1 respectively when W0 = 20), but there was no monotonous variation with the change in size of micellar size as in the case with CTAB reverse micelle. From the anisotropy studies, it was seen that inside CTAB and AOT reverse micelles, there is a significant amount of residual anisotropy, which is absent in the case of DACIA-tagged papain in bulk water. The rotational correlation times were also found to be higher inside the reverse micelles than those in bulk water. Both residual anisotropy and rotational correlation time were found to be more in the case with AOT reverse micelle than with CTAB reverse micelle. These behaviours could be explained based on the electrostatic forces acting between the papain having a positive surface charge and the reverse micelles of cationic CTAB and anionic AOT.
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Affiliation(s)
- Vaisakh Mohan
- 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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Prabhu AA, Purkayastha A, Mandal B, Kumar JP, Mandal BB, Veeranki VD. A novel reverse micellar purification strategy for histidine tagged human interferon gamma (hIFN-γ) protein from Pichia pastoris. Int J Biol Macromol 2018; 107:2512-2524. [DOI: 10.1016/j.ijbiomac.2017.10.130] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 10/17/2017] [Accepted: 10/20/2017] [Indexed: 11/16/2022]
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6
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Singh O, Kaur R, Mahajan RK. Flavonoid-surfactant interactions: A detailed physicochemical study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 170:77-88. [PMID: 27419641 DOI: 10.1016/j.saa.2016.07.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 06/23/2016] [Accepted: 07/05/2016] [Indexed: 06/06/2023]
Abstract
The aim of this article is to study the interactions between flavonoids and surfactants with attention of finding the probable location of flavonoids in micellar media that can be used for controlling their antioxidant behavior. In present study, the micellar and interfacial behavior of twin tailed anionic surfactants viz. sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and sodium bis(2-ethylhexyl)phosphate (NaDEHP) in the presence of two flavonoids, namely quercetin (QUE) and kaempferol (KFL) have been studied by surface tension measurements. UV-visible, fluorescence and differential pulse voltammetric (DPV) measurements have been employed to predict the probable location of flavonoids (QUE/KFL) within surfactant (AOT/NaDEHP) aggregates. Dynamic light scattering (DLS) measurements further confirmed the solubilization of QUE/KFL in AOT/NaDEHP aggregates deduced from increased hydrodynamic diameter (Dh) of aggregates in the presence of flavonoids. Both radical scavenging activity (RSA) and degradation rate constant (k) of flavonoids are found to be higher in NaDEHP micelles as compared to AOT micelles.
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Affiliation(s)
- Onkar Singh
- Department of Chemistry, UGC-centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar-143005, India
| | - Rajwinder Kaur
- Department of Chemistry, UGC-centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar-143005, India
| | - Rakesh Kumar Mahajan
- Department of Chemistry, UGC-centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar-143005, India.
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Sengupta B, Yadav R, Sen P. Startling temperature effect on proteins when confined: single molecular level behaviour of human serum albumin in a reverse micelle. Phys Chem Chem Phys 2016; 18:14350-8. [DOI: 10.1039/c6cp00452k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The present work reports the effect of confinement, and temperature therein, on the conformational fluctuation dynamics of domain-I of human serum albumin (HSA) by fluorescence correlation spectroscopy (FCS).
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Affiliation(s)
- Bhaswati Sengupta
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
| | - Rajeev Yadav
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
| | - Pratik Sen
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
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Cui K, Yuan X, Sun T, Huang H, Peng X, Zhang Y, Zeng G, Fu L. Laccase behavior in the microenvironment of water core within a biosurfactant-based reversed micelles system rhamnolipid/n-hexanol/isooctane/water. SURF INTERFACE ANAL 2015. [DOI: 10.1002/sia.5737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kailong Cui
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Xingzhong Yuan
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Ting Sun
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Huajun Huang
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Xin Peng
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Yongqiang Zhang
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
| | - Lihuan Fu
- College of Environmental Science and Engineering; Hunan University; Changsha 410082 PR China
- Key Laboratory of Environmental Biology and Pollution Control (Hunan University); Ministry of Education; Changsha 410082 PR China
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9
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Kaur R, Mahajan RK. Twin-tailed surfactant induced conformational changes in bovine serum albumin: a detailed spectroscopic and physicochemical study. RSC Adv 2014. [DOI: 10.1039/c4ra03653k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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10
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Das K, Maiti S, Das PK. Probing enzyme location in water-in-oil microemulsion using enzyme-carbon dot conjugates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2448-59. [PMID: 24528191 DOI: 10.1021/la403835h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This article delineates the formation and characterization of different enzyme-carbon dot conjugates in aqueous medium (pH = 7.0). We used soybean peroxidase (SBP), Chromobacterium viscosum (CV) lipase, trypsin, and cytochrome c (cyt c) for the formation of conjugate either with cationic carbon dot (CCD) or anionic carbon dot (ACD) depending on the overall charge of the protein at pH 7.0. These nanobioconjugates were used to probe the location of enzymes in water-in-oil (w/o) microemulsion. The size of the synthesized water-soluble carbon dots were of 2-3 nm with distinctive emission property. The formation of enzyme/protein-carbon dot conjugates in aqueous buffer was confirmed via fluorescence spectroscopy and zeta potential measurement, and the structural alteration of enzyme/protein was monitored by circular dichroism spectroscopy. Biocatalytic activities of protein/enzymes in conjugation with carbon dots were found to be decreased in aqueous phosphate buffer (pH 7.0, 25 mM). Interestingly, the catalytic activity of the nanobioconjugates of SBP, CV lipase, and cyt c did not reduce in cetyltrimethylammonium bromide (CTAB)-based reverse micelle. It indicates different localization of carbon dots and the enzymes inside the reverse micelle. The hydrophilic carbon dots always preferred to be located in the water pool of reverse micelle, and thus, enzyme must be located away from the water pool, which is the interface. However, in case of trypsin-carbon dot conjugate, the enzyme activity notably decreased in reverse micelle in the presence of carbon dot in a similar way that was observed in water. This implies that trypsin and carbon dots both must be located at the same place, which is the water pool of reverse micelle. Carbon dot induced deactivation was not observed for those enzymes which stay away from the water pool and localized at the interfacial domain while deactivation is observed for those enzymes which reside at the water pool. Thus, the location of enzymes in the microdomain of w/o microemulsion can be predicted by comparing the activity profile of enzyme-carbon dot conjugate in water and w/o microemulsion.
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Affiliation(s)
- Krishnendu Das
- Department of Biological Chemistry, Indian Association for the Cultivation of Science Jadavpur , Kolkata 700 032, India
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11
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Patil AJ, Li M, Mann S. Integrative self-assembly of functional hybrid nanoconstructs by inorganic wrapping of single biomolecules, biomolecule arrays and organic supramolecular assemblies. NANOSCALE 2013; 5:7161-7174. [PMID: 23824335 DOI: 10.1039/c3nr02796a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Synthesis of functional hybrid nanoscale objects has been a core focus of the rapidly progressing field of nanomaterials science. In particular, there has been significant interest in the integration of evolutionally optimized biological systems such as proteins, DNA, virus particles and cells with functional inorganic building blocks to construct mesoscopic architectures and nanostructured materials. However, in many cases the fragile nature of the biomolecules seriously constrains their potential applications. As a consequence, there is an on-going quest for the development of novel strategies to modulate the thermal and chemical stabilities, and performance of biomolecules under adverse conditions. This feature article highlights new methods of "inorganic molecular wrapping" of single or multiple protein molecules, individual double-stranded DNA helices, lipid bilayer vesicles and self-assembled organic dye superstructures using inorganic building blocks to produce bio-inorganic nanoconstructs with core-shell type structures. We show that spatial isolation of the functional biological nanostructures as "armour-plated" enzyme molecules or polynucleotide strands not only maintains their intact structure and biochemical properties, but also enables the fabrication of novel hybrid nanomaterials for potential applications in diverse areas of bionanotechnology.
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Affiliation(s)
- Avinash J Patil
- Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Cantocks Close, BS8 1TS, UK.
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12
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Badenes SM, Lemos F, Cabral JMS. Kinetics and mechanism of the cutinase-catalyzed transesterification of oils in AOT reversed micellar system. Bioprocess Biosyst Eng 2011; 34:1133-42. [DOI: 10.1007/s00449-011-0564-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Accepted: 06/09/2011] [Indexed: 11/30/2022]
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13
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Tian J, García AE. Simulations of the confinement of ubiquitin in self-assembled reverse micelles. J Chem Phys 2011; 134:225101. [PMID: 21682536 PMCID: PMC3133568 DOI: 10.1063/1.3592712] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 04/30/2011] [Indexed: 11/14/2022] Open
Abstract
We describe the effects of confinement on the structure, hydration, and the internal dynamics of ubiquitin encapsulated in reverse micelles (RM). We performed molecular dynamics simulations of the encapsulation of ubiquitin into self-assembled protein/surfactant reverse micelles to study the positioning and interactions of the protein with the RM and found that ubiquitin binds to the RM interface at low salt concentrations. The same hydrophobic patch that is recognized by ubiquitin binding domains in vivo is found to make direct contact with the surfactant head groups, hydrophobic tails, and the iso-octane solvent. The fast backbone N-H relaxation dynamics show that the fluctuations of the protein encapsulated in the RM are reduced when compared to the protein in bulk. This reduction in fluctuations can be explained by the direct interactions of ubiquitin with the surfactant and by the reduced hydration environment within the RM. At high concentrations of excess salt, the protein does not bind strongly to the RM interface and the fast backbone dynamics are similar to that of the protein in bulk. Our simulations demonstrate that the confinement of protein can result in altered protein dynamics due to the interactions between the protein and the surfactant.
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Affiliation(s)
- Jianhui Tian
- Department of Physics, Applied Physics and Astronomy and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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14
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Dong XY, Feng XD, Sun Y. His-tagged protein purification by metal-chelate affinity extraction with nickel-chelate reverse micelles. Biotechnol Prog 2010; 26:1088-94. [PMID: 20730766 DOI: 10.1002/btpr.428] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Di(2-ethylhexyl) phosphoric acid (HDEHP) was used as a transition metal ion chelator and introduced to the nonionic reverse micellar system composed of equimolar Triton X-45 and Span 80 at a total concentration of 30 mmol/L. Ni(II) ions were chelated to the HDEHP dimers in the reverse micelles, forming a complex denoted as Ni(II)R(2). The Ni(II)-chelate reverse micelles were characterized for the purification of recombinant hexahistidine-tagged enhanced green fluorescent protein (EGFP) expressed in Escherichia coli. The affinity binding of EGFP to Ni(II)R(2) was proved by investigation of the forward and back extraction behaviors of purified EGFP. Then, EGFP was purified with the affinity reverse micelles. It was found that the impurities in the feedstock impeded EGFP transfer to the reverse micelles, though they were little solubilized in the organic phase. The high specificity of the chelated Ni(2+) ions toward the histidine tag led to the production of electrophoretically pure EGFP, which was similar to that purified by immobilized metal affinity chromatography. A two-stage purification by the metal-chelate affinity extraction gave rise to 87% recovery of EGFP. Fluorescence spectrum analysis suggests the preservation of native protein structure after the separation process, indicating the system was promising for protein purification.
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Affiliation(s)
- Xiao-Yan Dong
- Dept. of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
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15
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Spectroscopic investigations of aromatic heterocyclic compounds in reverse micellar media. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.07.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Dong XY, Meng Y, Feng XD, Sun Y. A metal-chelate affinity reverse micellar system for protein extraction. Biotechnol Prog 2010; 26:150-8. [PMID: 19830821 DOI: 10.1002/btpr.291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A new nonionic reverse micellar system is developed by blending two nonionic surfactants, Triton X-45 and Span 80. At total surfactant concentrations lower than 60 mmol/L and molar fractions of Triton X-45 less than 0.6, thermodynamically stable reverse micelles of water content (W(0)) up to 30 are formed. Di(2-ethylhexyl) phosphoric acid (HDEHP; 1-2 mmol/L) is introduced into the system for chelating transition metal ions that have binding affinity for histidine-rich proteins. HDEHP exists in a dimeric form in organic solvents and a dimer associated with one transition metal ion, including copper, zinc, and nickel. The copper-chelate reverse micelles (Cu-RM) are characterized for their W(0), hydrodynamic radius (R(h)), and aggregation number (N(ag)). Similar with reverse micelles of bis-2-ethylhexyl sodium sulfosuccinate (AOT), R(h) of the Cu-RM is also linearly related to W(0). However, N(ag) is determined to be 30-90 at W(0) of 5-30, only quarter to half of the AOT reverse micelles. Then, selective metal-chelate extraction of histidine-rich protein (myoglobin) by the Cu-RM is successfully performed with pure and mixed protein systems (myoglobin and lysozyme). The solubilized protein can be recovered by stripping with imidazole or ethylinediaminetetraacetic acid (EDTA) solution. Because various transition metal ions can be chelated to the reverse micelles, it is convinced that the system would be useful for application in protein purification as well as simultaneous isolation and refolding of recombinant histidine-tagged proteins expressed as inclusion bodies.
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Affiliation(s)
- Xiao-Yan Dong
- Dept. of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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17
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Miniemulsion as efficient system for enzymatic synthesis of acid alkyl esters. Biotechnol Bioeng 2010; 106:507-15. [DOI: 10.1002/bit.22726] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Behera K, Malek NI, Pandey S. Visual Evidence for Formation of Water-in-Ionic Liquid Microemulsions. Chemphyschem 2009; 10:3204-8. [DOI: 10.1002/cphc.200900669] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Madeira C, Estrela N, Ferreira JAB, Andrade SM, Costa SMB, Melo EP. Fluorescence lifetime imaging microscopy and fluorescence resonance energy transfer from cyan to yellow fluorescent protein validates a novel method to cluster proteins on solid surfaces. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:044035. [PMID: 19725746 DOI: 10.1117/1.3210770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel method to distribute proteins on solid surfaces is proposed. Proteins microencapsulated in the water pool of reverse micelles were used to coat a solid surface with well-individualized round spots of 1 to 3 microm in diameter. The number of spots per unit area can be increased through the concentration of reverse micelles, and networks of spots were obtained at high concentrations of large reverse micelles. Moreover, depending on the pool size of the water reverse micelles, proteins can be deposited far from each other or in close proximity within the range of 50 to 70 A. This proximity obtained with small reverse micelles was proved through fluorescence lifetime imaging microscopy and fluorescence resonance energy transfer (FLIM-FRET) measurements for the most relevant FRET pair in cell biology studies, the cyan and yellow fluorescent proteins. This novel procedure has several advantages and reveals the potential for study of protein-protein interactions on solid surfaces and for developing novel biomaterials and molecular devices based on biorecognition elements.
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Affiliation(s)
- Catarina Madeira
- Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Tecnico, Av Rovisco Pais, Lisbon, 1049-001, Portugal
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20
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Tonova K, Lazarova Z. Reversed micelle solvents as tools of enzyme purification and enzyme-catalyzed conversion. Biotechnol Adv 2008; 26:516-32. [DOI: 10.1016/j.biotechadv.2008.06.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2008] [Revised: 06/16/2008] [Accepted: 06/23/2008] [Indexed: 10/21/2022]
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21
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Zhang Y, Li J, Dong L, Li Y, Chen X. Characterization of interaction between esculin and human serum albumin in membrane mimetic environments. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.01.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Moniruzzaman M, Kamiya N, Nakashima K, Goto M. Formation of reverse micelles in a room-temperature ionic liquid. Chemphyschem 2008; 9:689-92. [PMID: 18338420 DOI: 10.1002/cphc.200700802] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Muhammad Moniruzzaman
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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23
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Studies on the interaction of caffeic acid with human serum albumin in membrane mimetic environments. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2008; 90:141-51. [DOI: 10.1016/j.jphotobiol.2007.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2007] [Revised: 11/27/2007] [Accepted: 12/18/2007] [Indexed: 12/11/2022]
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24
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Characterization of Interaction Between Bergenin and Human Serum Albumin in Membrane Mimetic Environments. J Fluoresc 2008; 18:661-70. [DOI: 10.1007/s10895-008-0347-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2007] [Accepted: 02/07/2008] [Indexed: 10/22/2022]
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25
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Biasutti MA, Abuin EB, Silber JJ, Correa NM, Lissi EA. Kinetics of reactions catalyzed by enzymes in solutions of surfactants. Adv Colloid Interface Sci 2008; 136:1-24. [PMID: 17706582 DOI: 10.1016/j.cis.2007.07.001] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Revised: 06/30/2007] [Accepted: 07/02/2007] [Indexed: 11/20/2022]
Abstract
The effect of surfactants, both in water-in-oil microemulsions (hydrated reverse micelles) and aqueous solutions upon enzymatic processes is reviewed, with special emphasis on the effect of the surfactant upon the kinetic parameters of the process. Differences and similarities between processes taking place in aqueous and organic solvents are highlighted, and the main models currently employed to interpret the results are briefly discussed.
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26
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Caetano W, Ferreira M, Oliveira ON, Itri R. Enhanced stabilization of aerosol-OT surfactant monolayer upon interaction with small amounts of bovine serum albumin at the air–water interface. Colloids Surf B Biointerfaces 2004; 38:21-7. [PMID: 15465300 DOI: 10.1016/j.colsurfb.2004.08.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2004] [Accepted: 08/17/2004] [Indexed: 11/16/2022]
Abstract
An investigation is made of the influence from small amounts of the protein bovine serum albumin (BSA) on the lateral organization of low molecular weight surfactant sodium bis-2-ethylhexyl sulfosuccinate (AOT) at the air-water interface. Surface pressure (pi - A), surface potential (deltaV - A) and Brewster angle microscopy (BAM) experiments were carried out, with particular emphasis on the monolayer stability under successive compression-expansion cycles. AOT monolayer is not stable at the air-water interface, which means that the majority of AOT molecules go into the aqueous subphase as monomers and/or normal micelles. When a waiting time elapses between spreading and compression, the surfactant monolayer tends to reorganize partially at the air-water interface, with a monolayer expansion being observed for waiting times as large as 12 h. The incorporation of very small amount of BSA (10(-9)M) at the interface, also inferred from BAM, increases the monolayer stability as revealed by pi - A and deltaV - A results. For a waiting time of circa 3 h, the mixed monolayer reaches its maximum stability. This must be related to protein (and/or protein-surfactant complexes) adsorbed onto the AOT monolayer, thus altering the BSA conformation to accommodate its hydrophobic/hydrophilic residues. Furthermore, the effects from such small amounts of BSA in the monolayer formation and stabilization mean that the AOT monolayer responds cooperatively to BSA.
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Affiliation(s)
- Wilker Caetano
- Depto. de Física Aplicada, Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo/SP, Brazil
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27
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Gun'ko VM, Klyueva AV, Levchuk YN, Leboda R. Photon correlation spectroscopy investigations of proteins. Adv Colloid Interface Sci 2003; 105:201-328. [PMID: 12969646 DOI: 10.1016/s0001-8686(03)00091-5] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Physical principles of photon correlation spectroscopy (PCS), mathematical treatment of the PCS data (converting autocorrelation functions to distribution functions or average characteristics), and PCS applications to study proteins and other biomacromolecules in aqueous media are described and analysed. The PCS investigations of conformational changes in protein molecules, their aggregation itself or in consequence of interaction with other molecules or organic (polymers) and inorganic (e.g. fumed silica) fine particles as well as the influence of low molecular compounds (surfactants, drugs, salts, metal ions, etc.) reveal unique capability of the PCS techniques for elucidation of important native functions of proteins and other biomacromolecules (DNA, RNA, etc.) or microorganisms (Escherichia coli, Pseudomonas putida, Dunaliella viridis, etc.). Special attention is paid to the interaction of proteins with fumed oxides and the impact of polymers and fine oxide particles on the motion of living flagellar microorganisms analysed by means of PCS.
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Affiliation(s)
- Vladimir M Gun'ko
- Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine.
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28
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Melo EP, Baptista RP, Cabral JM. Improving cutinase stability in aqueous solution and in reverse micelles by media engineering. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1177(03)00044-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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29
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Melo EP, Costa SMB, Cabral JMS, Fojan P, Petersen SB. Cutinase-AOT interactions in reverse micelles: the effect of 1-hexanol. Chem Phys Lipids 2003; 124:37-47. [PMID: 12787942 DOI: 10.1016/s0009-3084(03)00031-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Cutinase encapsulated in dioctyl sulfosuccinate reverse micelles displays very low stability, undergoing fast denaturation due to an anchoring at the micellar interface. The denaturation process and the structure of the reverse micelle were characterized using biophysical techniques. The kinetics of denaturation observed from fluorescence match the increase of the hydrodynamic radius of reverse micelles. Denaturation in reverse micelles is mainly the unfolding of the three-dimensional structure since the decrease in the circular dichroism ellipticity in the far-UV range is very small. The process is accompanied by an increase in the steady-state anisotropy, as opposed to what happens for denaturation in aqueous solution. Since 1-hexanol used as co-surfactant in dioctyl sulfosuccinate reverse micelles slows or even prevents cutinase denaturation, its effect on cutinase conformation and on the size of reverse micelles was analyzed. When 1-hexanol is present, cutinase is encapsulated in a large reverse micelle, as deduced from dynamic light scattering. The large reverse micelle filled with cutinase was built from the fusion of reverse micelles according to a pseudo-unimolecular process ranging in time from a few minutes to 2h depending on the reverse micellar concentration. This slow equilibrium driven by the encapsulated cutinase has not been reported previously. The encapsulation of cutinase in dioctyl sulfosuccinate reverse micelles establishes a completely new equilibrium characterized by a bimodal population of empty and filled reverse micelles, whose characteristics depend greatly on the interfacial characteristics, that is, on the absence or presence of 1-hexanol.
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Affiliation(s)
- Eduardo P Melo
- Faculdade de Engenharia dos Recursos Naturais, Universidade do Algarve, Campus de Gambelas, 8000-117 Faro, Portugal.
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30
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Melo EP, Aires-Barros MR, Cabral JM. Reverse micelles and protein biotechnology. BIOTECHNOLOGY ANNUAL REVIEW 2002; 7:87-129. [PMID: 11686050 DOI: 10.1016/s1387-2656(01)07034-x] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Reverse micelles are nanometer-sized (1-10 nm) water droplets dispersed in organic media obtained by the action of surfactants. Surfactant molecules organize with the polar part to the inner side able to solubilize water and the apolar part in contact with the organic solvent. Proteins can be solubilized in the water pool of reverse micelles. Studies on the structure-function relationships of proteins in reverse micelles are very important since the microenvironment in which the protein is solubilized has physico-chemical properties distinct from a bulk aqueous solution. Some of the unique characteristics of reverse micelles make them very useful for biotechnological applications. Charge and hydrophilic/hydrophobic characteristics of the protein and the selection of surfactant can be used to achieve selective solubilization of proteins. This has been used to extend the classical liquid-liquid extraction with solvents to protein bioseparation. For biocatalysis the presence of a bulk organic solvent allow synthetic reactions to be performed via the control of water content and the solubilization of hydrophobic substrates. This is accomplished with a higher interfacial area (about 100 m2/mL) than the conventional biphasic systems, minimizing mass transfer problems.
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Affiliation(s)
- E P Melo
- Universidade do Algarve-F.E.R.N., Campus de Gambelas, 8000 Faro, Portugal.
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