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Li H, Deng Y, Du S, Liu C, Li K, Xue X, Xu H, Zhang Y, Yi T, Gao X. Asymmetric Sulfoxidation of Thioether Catalyzed by Soybean Pod Shell Peroxidase to Form Enantiopure Sulfoxide in Water-in-Oil Microemulsions: A Kinetic Model. Chem Asian J 2021; 16:2075-2086. [PMID: 34121354 DOI: 10.1002/asia.202100467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/27/2021] [Indexed: 11/08/2022]
Abstract
Esomeprazole with chiral sulfoxides structure is used to treat gastric ulcer disease. Soybean pod shell peroxidase (SPSP) is a peroxidase extracted from soybean pods shells which are one of the most abundant natural resources in the world. In the production of chiral sulfoxides catalyzed by SPSP, it is very important to establish the reaction kinetic model and explore the reaction mechanism for the development of the process, however, there is no report on the establishment of the model. Asymmetric sulfoxidation reactions catalyzed by SPSP in water-in-oil microemulsions were carried out, and the King-Altman approach was used to establish a kinetic model. A yield of 91% and e.e. value of 96% for esomeprazole were obtained at the activity of SPSP of 3200 U ml-1 and 50 °C for 5 h. The mechanism with a two-electron reduction of SPSP-I is accompanied with a single-electron transfer to SPSP-I and nonenzymatic reactions, indicating that three concomitant sub-mechanisms contribute to the asymmetric oxidation involving five enzymatic and two nonenzymatic reactions, which can represent the asymmetric sulfoxidation of organic sulfides to form enantiopure sulfoxides. With 5.44% of the average relative deviation, a kinetic model fitting experimental data was developed. The enzymatic reactions may follow ping-pong mechanism with substrate inhibition of H2 O2 and product inhibition of esomeprazole, while nonenzymatic reactions follow a power law. Those results indicate that SPSP with a lower cost and higher thermal stability may be used as an effective substitute for horseradish peroxidase.
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Affiliation(s)
- Huiling Li
- State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Yashan Deng
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - ShanShan Du
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Cui Liu
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Kaiyuan Li
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Xiao Xue
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Hui Xu
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
| | - Yuanyuan Zhang
- State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
- William G. Lowrie Department of Chemical and Biomolecular Engineering, Ohio State University, 151 West Woodruff Avenue, Columbus, Ohio, 43210, USA
| | - Tingting Yi
- College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong St, Tai'an, Shandong, 271018, P. R. China
| | - Xin Gao
- Department of Pharmaceutical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Mailbox 70, 53 Zhengzhou Road, Qingdao, 266042, P. R. China
- Kekulé-Institut für Organische Chemie und Biochemieder Rheinischen, Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121, Bonn, Germany
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2
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Tang H, Zhang Y, Deng Y, Du S, Li D, Wang Z, Li H, Gao X, Wang F. Optimization of Synthesis of (S)-Omeprazole Catalyzed by Soybean Pod Peroxidase in Water-in-Oil Microemulsions Using RSM. Catal Letters 2021. [DOI: 10.1007/s10562-021-03681-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Versatility of Reverse Micelles: From Biomimetic Models to Nano (Bio)Sensor Design. Processes (Basel) 2021. [DOI: 10.3390/pr9020345] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
This paper presents an overview of the principal structural and dynamics characteristics of reverse micelles (RMs) in order to highlight their structural flexibility and versatility, along with the possibility to modulate their parameters in a controlled manner. The multifunctionality in a large range of different scientific fields is exemplified in two distinct directions: a theoretical model for mimicry of the biological microenvironment and practical application in the field of nanotechnology and nano-based sensors. RMs represent a convenient experimental approach that limits the drawbacks of the conventionally biological studies in vitro, while the particular structure confers them the status of simplified mimics of cells by reproducing a complex supramolecular organization in an artificial system. The biological relevance of RMs is discussed in some particular cases referring to confinement and a crowded environment, as well as the molecular dynamics of water and a cell membrane structure. The use of RMs in a range of applications seems to be more promising due to their structural and compositional flexibility, high efficiency, and selectivity. Advances in nanotechnology are based on developing new methods of nanomaterial synthesis and deposition. This review highlights the advantages of using RMs in the synthesis of nanoparticles with specific properties and in nano (bio)sensor design.
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4
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Liu Y, Zhong Z, Wu Q, Liu F, Shi ZQ, Yao ZP, Di X. Enhancing enrichment ability of ZIF-8 mixed matrix membrane microextraction by reverse micelle strategy for analysis of multiple ionizable bioactive components in biological samples. Talanta 2020; 217:121030. [PMID: 32498909 DOI: 10.1016/j.talanta.2020.121030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 04/08/2020] [Accepted: 04/10/2020] [Indexed: 10/24/2022]
Abstract
Recent research aimed at the design of mixed-matrix membrane (MMM) to be used for microextraction emphasized on membrane extraction phase with high surface area and porosity. This study explored the influence that surfactants have on MMM extraction efficiency for the first time. The zeolitic imidazolate framework 8-based MMM (ZIF-8-MMM) was synthesized by in situ self-assembly of ZIF-8 on the inner wall of a hollow fiber membrane with the aim of fabricating a microextraction device. By prompting the encapsulation of ionizable analytes in the polar core of reverse micelles, the presence of surfactants in extraction solvent assisted the dissolution of analytes in the fiber membrane lumen and enhanced their adsorption onto ZIF-8. Notably, hereby a microextraction method based on the novel ZIF-8-MMM-reverse micelle (ZIF-8-MMM-RM) system was developed and employed for the extraction and quantitation of two alkaloids (berberine and jatrorrhizine) and two flavonoids (wogonin and wogonoside) in biological samples. The main factors affecting microextraction performance, identity of the extraction solvent, surfactant concentration, sample solution pH and extraction time, were investigated in detail. The method showed good linearity (r2 > 0.99) and repeatability (RSD < 10%), low limits of detection (0.10-0.31 ng mL-1) and high relative recoveries (90.03-98.84%). The enrichment factor values ranged between 48.47 and 54.96. Reverse micelle formation prompted by surfactant addition was demonstrated to effectively assist the extraction of multiple ionizable analytes from biological samples, resulting in a marked improvement of ZIF-8-MMM extraction performance.
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Affiliation(s)
- Yangdan Liu
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, China
| | - Zhujun Zhong
- State Key Laboratory of Natural Medicines, Department of Chinese Medicines Analysis, China Pharmaceutical University, NO.24 Tongjia Lane, Nanjing, China
| | - Qinchang Wu
- College of Pharmacy, Jinan University, Guangzhou, China
| | - Fengjie Liu
- State Key Laboratory of Natural Medicines, Department of Chinese Medicines Analysis, China Pharmaceutical University, NO.24 Tongjia Lane, Nanjing, China
| | - Zi-Qi Shi
- Key Laboratory of New Drug Delivery Systems of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Jiangsu, Nanjing, China
| | - Zhong-Ping Yao
- State Key Laboratory of Chemical Biology and Drug Discovery, Food Safety and Technology Research Centre and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation) and Shenzhen Key Laboratory of Food Biological Safety Control, Shenzhen Research Institute of Hong Kong Polytechnic University, Shenzhen, 518057, China.
| | - Xin Di
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, China.
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Strubbe F, Neyts K. Charge transport by inverse micelles in non-polar media. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:453003. [PMID: 28895874 DOI: 10.1088/1361-648x/aa8bf6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Charged inverse micelles play an important role in the electrical charging and the electrodynamics of nonpolar colloidal dispersions relevant for applications such as electronic ink displays and liquid toner printing. This review examines the properties and the behavior of charged inverse micelles in microscale devices in the absence of colloidal particles. It is discussed how charge in nonpolar liquids is stabilized in inverse micelles and how conductivity depends on the inverse micelle size, water content and ionic impurities. Frequently used nonpolar surfactant systems are investigated with emphasis on aerosol-OT (AOT) and poly-isobutylene succinimide (PIBS) in dodecane. Charge generation in the bulk by disproportionation is studied from measurements of conductivity as a function of surfactant concentration and from generation currents in quasi steady-state. When a potential difference is applied, the steady-state situation can show electric field screening or complete charge separation. Different regimes of charge transport are identified when a voltage step is applied. It is shown how the transient and steady-state currents depend on the rate of bulk generation, on insulating layers and on the sticking or non-sticking behavior of charged inverse micelles at interfaces. For the cases of AOT and PIBS in dodecane, the magnitude of the generation rate and the type of interaction at the interface are very different.
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Affiliation(s)
- Filip Strubbe
- Electronics and Information Systems Department and Center for Nano and Biophotonics, Ghent University, Technologiepark Zwijnaarde 15, 9052 Zwijnaarde, Belgium
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6
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Manna S, Panse CH, Sontakke VA, Sangamesh S, Srivatsan SG. Probing Human Telomeric DNA and RNA Topology and Ligand Binding in a Cellular Model by Using Responsive Fluorescent Nucleoside Probes. Chembiochem 2017; 18:1604-1615. [PMID: 28569423 PMCID: PMC5724660 DOI: 10.1002/cbic.201700283] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Indexed: 01/03/2023]
Abstract
The development of biophysical systems that enable an understanding of the structure and ligand-binding properties of G-quadruplex (GQ)-forming nucleic acid sequences in cells or models that mimic the cellular environment would be highly beneficial in advancing GQ-directed therapeutic strategies. Herein, the establishment of a biophysical platform to investigate the structure and recognition properties of human telomeric (H-Telo) DNA and RNA repeats in a cell-like confined environment by using conformation-sensitive fluorescent nucleoside probes and a widely used cellular model, bis(2-ethylhexyl) sodium sulfosuccinate reverse micelles (RMs), is described. The 2'-deoxy and ribonucleoside probes, composed of a 5-benzofuran uracil base analogue, faithfully report the aqueous micellar core through changes in their fluorescence properties. The nucleoside probes incorporated into different loops of H-Telo DNA and RNA oligonucleotide repeats are minimally perturbing and photophysically signal the formation of respective GQ structures in both aqueous buffer and RMs. Furthermore, these sensors enable a direct comparison of the binding affinity of a ligand to H-Telo DNA and RNA GQ structures in the bulk and confined environment of RMs. These results demonstrate that this combination of a GQ nucleoside probe and easy-to-handle RMs could provide new opportunities to study and devise screening-compatible assays in a cell-like environment to discover GQ binders of clinical potential.
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Affiliation(s)
- Sudeshna Manna
- Department of ChemistryIndian Institute of Science Education and Research (IISER)Dr. Homi Bhabha RoadPune411008India
| | - Cornelia H. Panse
- Department of ChemistryIndian Institute of Science Education and Research (IISER)Dr. Homi Bhabha RoadPune411008India
| | - Vyankat A. Sontakke
- Department of ChemistryIndian Institute of Science Education and Research (IISER)Dr. Homi Bhabha RoadPune411008India
| | - Sarangamath Sangamesh
- Department of ChemistryIndian Institute of Science Education and Research (IISER)Dr. Homi Bhabha RoadPune411008India
| | - Seergazhi G. Srivatsan
- Department of ChemistryIndian Institute of Science Education and Research (IISER)Dr. Homi Bhabha RoadPune411008India
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7
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Flores ME, Martínez F, Olea AF, Shibue T, Sugimura N, Nishide H, Moreno-Villoslada I. Water-Induced Phase Transition in Cyclohexane/n-Hexanol/Triton X-100 Mixtures at a Molar Composition of 1/16/74 Studied by NMR. J Phys Chem B 2017; 121:876-882. [DOI: 10.1021/acs.jpcb.6b11752] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Mario E. Flores
- Departamento
de Ciencia de los Materiales, Facultad de Ciencias Físicas
y Matemáticas, Universidad de Chile, Avenida Tupper 2069, Santiago 8370451, Chile
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Las Encinas 220, Valdivia 5090000, Chile
| | - Francisco Martínez
- Departamento
de Ciencia de los Materiales, Facultad de Ciencias Físicas
y Matemáticas, Universidad de Chile, Avenida Tupper 2069, Santiago 8370451, Chile
| | - Andrés F. Olea
- Instituto
de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux 2801, Santiago 8320325, Chile
| | - Toshimichi Shibue
- Material
Characterization Central Laboratory, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Natsuhiko Sugimura
- Material
Characterization Central Laboratory, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Hiroyuki Nishide
- Department
of Applied Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Ignacio Moreno-Villoslada
- Instituto
de Ciencias Químicas, Facultad de Ciencias, Universidad Austral de Chile, Las Encinas 220, Valdivia 5090000, Chile
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8
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Abstract
Enzymes in aqueous environment usually deal with purified enzyme preparations isolated from living matter which does not mimic real catalytic properties in vivo. Interaction of enzymes in nature takes place with different surfaces composed from lipid membranes or they get incorporated into biomembranes. Although Water is not a dominating component in the cytoplasm but plays a structural role by participating in the formation of biocatalytic complexes like glycoproteins. Water is needed to keep biocatalyst in active confirmation and hence plays very crucial role in biocatalytic reactions, activity and stability so that it can be used for various applications. This review focuses on composition, preparation properties and parameters which influence enzymes in reverse micelles and application of micellar enzymology to study protein chemistry, shifting equilibrium of various reactions, to recover various products by partition chromatography and bioremediation of chlorophenolic environmental pollutants.
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9
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Lee J, Zhou ZL, Behrens SH. Charging Mechanism for Polymer Particles in Nonpolar Surfactant Solutions: Influence of Polymer Type and Surface Functionality. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4827-4836. [PMID: 27135950 DOI: 10.1021/acs.langmuir.6b00583] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Surface charging phenomena in nonpolar dispersions are exploited in a wide range of industrial applications, but their mechanistic understanding lags far behind. We investigate the surface charging of a variety of polymer particles with different surface functionality in alkane solutions of a custom-synthesized and purified polyisobutylene succinimide (PIBS) polyamine surfactant and a related commercial surfactant mixture commonly used to control particle charge. We find that the observed electrophoretic particle mobility cannot be explained exclusively by donor-acceptor interactions between surface functional groups and surfactant polar moieties. Our results instead suggest an interplay of multiple charging pathways, which likely include the competitive adsorption of ions generated among inverse micelles in the solution bulk. We discuss possible factors affecting the competitive adsorption of micellar ions, such as the chemical nature of the particle bulk material and the size asymmetry between inverse micelles of opposite charge.
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Affiliation(s)
- Joohyung Lee
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive Northwest, Atlanta, Georgia 30332, United States
| | - Zhang-Lin Zhou
- HP Incorporated, 16399 West Bernardo Drive, San Diego, California 92127, United States
| | - Sven Holger Behrens
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive Northwest, Atlanta, Georgia 30332, United States
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10
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Lee J, Zhou ZL, Alas G, Behrens SH. Mechanisms of Particle Charging by Surfactants in Nonpolar Dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11989-11999. [PMID: 26484617 DOI: 10.1021/acs.langmuir.5b02875] [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
Electric charging of colloidal particles in nonpolar solvents plays a crucial role for many industrial applications and products, including rubbers, engine oils, toners, or electronic displays. Although disfavored by the low solvent permittivity, particle charging can be induced by added surfactants, even nonionic ones, but the underlying mechanism is poorly understood, and neither the magnitude nor the sign of charge can generally be predicted from the particle and surfactant properties. The conclusiveness of scientific studies has been limited partly by a traditional focus on few surfactant types with many differences in their chemical structure and often poorly defined composition. Here we investigate the surface charging of poly(methyl methacrylate) particles dispersed in hexane-based solutions of three purified polyisobutylene succinimide polyamine surfactants with "subtle" structural variations. We precisely vary the surfactant chemistry by replacing only a single electronegative atom located at a fixed position within the polar headgroup. Electrophoresis reveals that these small differences between the surfactants lead to qualitatively different particle charging. In the respective particle-free surfactant solutions we also find potentially telling differences in the size of the surfactant aggregates (inverse micelles), the residual water content, and the electric solution conductivity as well as indications for a significant size difference between oppositely charged inverse micelles of the most hygroscopic surfactant. An analysis that accounts for the acid/base properties of all constituents suggests that the observed particle charging is better described by asymmetric adsorption of charged inverse micelles from the liquid bulk than by charge creation at the particle surface. Intramicellar acid-base interaction and intermicellar surfactant exchange help rationalize the formation of micellar ions pairs with size asymmetry.
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Affiliation(s)
- Joohyung Lee
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
| | - Zhang-Lin Zhou
- Hewlett-Packard Company, 16399 W Bernardo Drive, San Diego, California 92127, United States
| | - Guillermo Alas
- School of Chemistry and Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Sven Holger Behrens
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive NW, Atlanta, Georgia 30332, United States
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11
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Valiullina YA, Ermakova EA, Faizullin DA, Mirgorodskaya AB, Zuev YF. Structure and catalytic activity of α-chymotrypsin in solutions of gemini surfactants. Russ Chem Bull 2014. [DOI: 10.1007/s11172-014-0423-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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León I, Millán J, Cocinero EJ, Lesarri A, Fernández JA. Water Encapsulation by Nanomicelles. Angew Chem Int Ed Engl 2014; 53:12480-3. [DOI: 10.1002/anie.201405652] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Indexed: 11/07/2022]
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13
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León I, Millán J, Cocinero EJ, Lesarri A, Fernández JA. Water Encapsulation by Nanomicelles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405652] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Sostarecz AG, Gaidamauskas E, Distin S, Bonetti SJ, Levinger NE, Crans DC. Correlation of insulin-enhancing properties of vanadium-dipicolinate complexes in model membrane systems: phospholipid langmuir monolayers and AOT reverse micelles. Chemistry 2014; 20:5149-59. [PMID: 24615733 DOI: 10.1002/chem.201201803] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 07/07/2013] [Indexed: 11/10/2022]
Abstract
We explore the interactions of V(III) -, V(IV) -, and V(V) -2,6-pyridinedicarboxylic acid (dipic) complexes with model membrane systems and whether these interactions correlate with the blood-glucose-lowering effects of these compounds on STZ-induced diabetic rats. Two model systems, dipalmitoylphosphatidylcholine (DPPC) Langmuir monolayers and AOT (sodium bis(2-ethylhexyl)sulfosuccinate) reverse micelles present controlled environments for the systematic study of these vanadium complexes interacting with self-assembled lipids. Results from the Langmuir monolayer studies show that vanadium complexes in all three oxidation states interact with the DPPC monolayer; the V(III) -phospholipid interactions result in a slight decrease in DPPC molecular area, whereas V(IV) and V(V) -phospholipid interactions appear to increase the DPPC molecular area, an observation consistent with penetration into the interface of this complex. Investigations also examined the interactions of V(III) - and V(IV) -dipic complexes with polar interfaces in AOT reverse micelles. Electron paramagnetic resonance spectroscopic studies of V(IV) complexes in reverse micelles indicate that the neutral and smaller 1:1 V(IV) -dipic complex penetrates the interface, whereas the larger 1:2 V(IV) complex does not. UV/Vis spectroscopy studies of the anionic V(III) -dipic complex show only minor interactions. These results are in contrast to behavior of the V(V) -dipic complex, [VO2 (dipic)](-) , which penetrates the AOT/isooctane reverse micellar interface. These model membrane studies indicate that V(III) -, V(IV) -, and V(V) -dipic complexes interact with and penetrate the lipid interfaces differently, an effect that agrees with the compounds' efficacy at lowering elevated blood glucose levels in diabetic rats.
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Affiliation(s)
- Audra G Sostarecz
- Chemistry Department, Monmouth College, 700 E. Broadway, Monmouth, IL 61462 (USA)
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15
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The role of microemulsions in lipase-catalyzed hydrolysis reactions. Biotechnol Prog 2014; 30:360-6. [DOI: 10.1002/btpr.1892] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 02/21/2014] [Indexed: 11/07/2022]
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16
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Pawar MG, Srivatsan SG. Environment-responsive fluorescent nucleoside analogue probe for studying oligonucleotide dynamics in a model cell-like compartment. J Phys Chem B 2013; 117:14273-82. [PMID: 24161106 DOI: 10.1021/jp4071168] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The majority of fluorescent nucleoside analogue probes that have been used in the in vitro study of nucleic acids are not suitable for cell-based biophysical assays because they exhibit excitation maxima in the UV region and low quantum yields within oligonucleotides. Therefore, we propose that the photophysical characterization of oligonucleotides labeled with a fluorescent nucleoside analogue in reverse micelles (RM), which are good biological membrane models and UV-transparent, could provide an alternative approach to studying the properties of nucleic acids in a cell-like confined environment. In this context, we describe the photophysical properties of an environment-sensitive fluorescent uridine analogue (1), based on the 5-(benzo[b]thiophen-2-yl)pyrimidine core, in micelles and RM. The emissive nucleoside, which is polarity- and viscosity-sensitive, reports the environment of the surfactant assemblies via changes in its fluorescence properties. The nucleoside analogue, incorporated into an RNA oligonucleotide and hybridized to its complementary DNA and RNA oligonucleotides, exhibits a significantly higher fluorescence intensity, lifetime, and anisotropy in RM than in aqueous buffer, which is consistent with the environment of RM. Collectively, our results demonstrate that nucleoside 1 could be utilized as a fluorescent label to study the function of nucleic acids in a model cellular milieu.
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Affiliation(s)
- Maroti G Pawar
- Department of Chemistry, Indian Institute of Science Education and Research, Pune , Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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17
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Chhaya U, Gupte A. Possible role of laccase from Fusarium incarnatum UC-14 in bioremediation of Bisphenol A using reverse micelles system. JOURNAL OF HAZARDOUS MATERIALS 2013; 254-255:149-156. [PMID: 23611799 DOI: 10.1016/j.jhazmat.2013.03.054] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 03/23/2013] [Accepted: 03/23/2013] [Indexed: 06/02/2023]
Abstract
Bisphenol A [2,2 bis (4 hydroxyphenyl) propane] is widely used in the variety of industrial and residential applications such as the synthesis of polymers including polycarbonates, epoxy resins, phenol resins, polyesters and polyacrylates. BPA has been recognized as an Endocrine Disrupting Chemicals (EDC), thus it is necessary to assess its biodegradability or fate in the natural environment. In general, environmental pollutant such as BPA does not dissolve in aqueous media, owing to their high hydrophobicity, and hence non-aqueous catalysis can be employed to enhance biodegradability of phenolic environmental pollutant. Purified laccase hosted in reverse micelles using ternary system of isooctane: AOT [Bis (2-ethylhexyl) sulphosuccinate sodium salt)]:water having hydration ratio (Wo) of 30 with protein concentration of 43.5 μg/ml was found to eliminate 91.43% of 200 ppm of Bisphenol A at 50 °C, pH-6.0 when incubated with laccase/Reverse Micelles system for 75 min. GC-MS analysis of isooctane soluble fractions detected the presence of 4,4'-(2 hydroxy propane 1,2 diyl) diphenol, bis (4-hydroxylphenyl) butenal and 2-(1-(4-hydroxyphenyl) vinyl) pent-2-enal indicated degradation of BPA by two oxidation steps and one ring opening step (C-C bond cleavage). Laccase/RM system exhibited several advantages for the oxidative degradation of hydrophobic phenols mainly because of the solubility of either enzyme or substrate was improved in organic media and the stable activity of laccase in organic media was achieved.
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Affiliation(s)
- Urvish Chhaya
- Department of Microbiology, Natubhai V. Patel College of Pure and Applied Sciences, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat, India
| | - Akshaya Gupte
- Department of Microbiology, Natubhai V. Patel College of Pure and Applied Sciences, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat, India.
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18
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León I, Millán J, Cocinero EJ, Lesarri A, Fernández JA. Shaping Micelles: The Interplay Between Hydrogen Bonds and Dispersive Interactions. Angew Chem Int Ed Engl 2013; 52:7772-5. [DOI: 10.1002/anie.201303245] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Indexed: 11/07/2022]
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19
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León I, Millán J, Cocinero EJ, Lesarri A, Fernández JA. Shaping Micelles: The Interplay Between Hydrogen Bonds and Dispersive Interactions. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303245] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Affiliation(s)
- Petr Král
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
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21
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Lemons BG, Richens DT, Anderson A, Sedgwick M, Crans DC, Johnson MD. Stabilization of a vanadium(v)–catechol complex by compartmentalization and reduced solvation inside reverse micelles. NEW J CHEM 2013. [DOI: 10.1039/c2nj40524e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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22
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Johnson MD, Lorenz BB, Wilkins PC, Lemons BG, Baruah B, Lamborn N, Stahla M, Chatterjee PB, Richens DT, Crans DC. Switching Off Electron Transfer Reactions in Confined Media: Reduction of [Co(dipic)2]− and [Co(edta)]− by Hexacyanoferrate(II). Inorg Chem 2012; 51:2757-65. [DOI: 10.1021/ic201247v] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael D. Johnson
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Bret B. Lorenz
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Patricia C. Wilkins
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Brant G. Lemons
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Bharat Baruah
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Nathan Lamborn
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Michelle Stahla
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - Pabitra B. Chatterjee
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| | - David T. Richens
- Department
of Chemistry and
Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003-8001, United States
| | - Debbie C. Crans
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
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23
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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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24
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Halliday NA, Peet AC, Britton MM. Detection of pH in Microemulsions, without a Probe Molecule, Using Magnetic Resonance. J Phys Chem B 2010; 114:13745-51. [DOI: 10.1021/jp108649x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicola A. Halliday
- School of Chemistry and School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Andrew C. Peet
- School of Chemistry and School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Melanie M. Britton
- School of Chemistry and School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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25
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Lutz NW, Cozzone PJ. Multiparametric optimization of (31)P NMR spectroscopic analysis of phospholipids in crude tissue extracts. 1. Chemical shift and signal separation. Anal Chem 2010; 82:5433-40. [PMID: 20443549 DOI: 10.1021/ac100514n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(31)P NMR spectroscopy is known to be a fast and accurate method for analyzing phospholipid extracts from biological samples without prior separation. However, the number of phospholipid classes and subclasses that can be quantitated separately in (31)P NMR spectra of tissue extracts is critically dependent on a variety of experimental conditions. For solvent systems resulting in the formation of two phases, the effects of varying water and methanol content on chemical shift and line width of phospholipid signals have been previously determined. However, little attention has been paid to the influence that other extract components may exert on signal separation. We present, for the first time, a systematic and comprehensive study of (31)P NMR chemical shift as a function of four experimental parameters: (i) extract concentration, (ii) concentration of chelating agent, (iii) pH value of the aqueous component of the solvent system, and (iv) temperature of the NMR measurement. This multiparametric study provides methodological guidelines for predictable and reproducible manipulation of (31)P NMR spectra of brain phospholipids. It also provides a database for rational and efficient optimization of phospholipid spectra from other body tissues, cultured cells, and phospholipid-containing biofluids.
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Affiliation(s)
- Norbert W Lutz
- Centre de Resonance Magnétique Biologique et Médicale, UMR CNRS 6612, Faculté de Medecine de la Timone, Université de la Méditerranée, 13005 Marseille, France.
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26
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Lutz NW, Cozzone PJ. Multiparametric optimization of (31)P NMR spectroscopic analysis of phospholipids in crude tissue extracts. 2. Line width and spectral resolution. Anal Chem 2010; 82:5441-6. [PMID: 20443551 DOI: 10.1021/ac100515y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The quality of NMR spectra in general and of spectra to be used for analysis of compound mixtures in particular is essentially defined by two basic parameters: signal-to-noise ratio and spectral resolution. The latter is determined by signal dispersion (chemical shift differences) and line widths. The present study focuses on multiparametric optimization of spectral resolution in (31)P NMR spectra of phospholipids from brain tissue extracts. This report presents, for the first time, a systematic and comprehensive study of phospholipid (31)P NMR line widths as a function of four experimental parameters: (i) extract concentration, (ii) concentration of a chelating agent, (iii) pH of the aqueous component of the solvent system, and (iv) temperature of the NMR measurement. Theoretical underpinnings of observed line width variations (transversal relaxation effects) are briefly discussed. In conjunction with an analogous, concurrently published report on chemical shift effects in the same tissue extract system, this multiparametric line width study provides a complete set of methodological guidelines for (i) generating well-defined tissue extracts, and (ii) choosing matched and optimized measurement conditions for highly reproducible and well-resolved (31)P NMR spectra of brain phospholipids. This study also offers a comprehensive database and a strategy for rational and efficient optimization of phospholipid spectra from other tissue extracts.
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Affiliation(s)
- Norbert W Lutz
- Centre de Résonance Magnétique Biologique et Médicale, UMR CNRS 6612, Faculté de Médecine de la Timone, Université de la Méditerranée, 13005 Marseille, France
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27
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Artificial self-sufficient P450 in reversed micelles. Molecules 2010; 15:2935-48. [PMID: 20657456 PMCID: PMC6257473 DOI: 10.3390/molecules15052935] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 04/14/2010] [Accepted: 04/23/2010] [Indexed: 11/17/2022] Open
Abstract
Cytochrome P450s are heme-containing monooxygenases that require electron transfer proteins for their catalytic activities. They prefer hydrophobic compounds as substrates and it is, therefore, desirable to perform their reactions in non-aqueous media. Reversed micelles can stably encapsulate proteins in nano-scaled water pools in organic solvents. However, in the reversed micellar system, when multiple proteins are involved in a reaction they can be separated into different micelles and it is then difficult to transfer electrons between proteins. We show here that an artificial self-sufficient cytochrome P450, which is an enzymatically crosslinked fusion protein composed of P450 and electron transfer proteins, showed micelle-size dependent catalytic activity in a reversed micellar system. Furthermore, the presence of thermostable alcohol dehydrogenase promoted the P450-catalyzed reaction due to cofactor regeneration.
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28
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Vuković L, Král P. Coulombically driven rolling of nanorods on water. PHYSICAL REVIEW LETTERS 2009; 103:246103. [PMID: 20366215 DOI: 10.1103/physrevlett.103.246103] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Indexed: 05/29/2023]
Abstract
We use molecular dynamics simulations to examine the possibility of rolling nanorods on the surfaces of polar liquids. Asymmetric charging of nanorod surfaces, generated by light excitation of its photoactive hydrophobic surfactants, can induce asymmetric Coulombic coupling to the polar liquid surfaces. We demonstrate that under this driving nanorods with diameters of 3-10 nm can roll on water with translational velocities of 1-5 nm/ns. The efficiency of this motion is controlled by the chemistry and dynamical phenomena at the nanorod-water interface.
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Affiliation(s)
- Lela Vuković
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, USA
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29
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Marhuenda-Egea FC, Piera-velázquez S, Cadenas C, Cadenas E. Kinetic Studies of an Extremely Halophilic Enzyme Entrapped in Reversed Micelles. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.3109/10242420009015245] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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30
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Pire C, Marhuenda-egea FC, Esclapez J, Alcaraz L, Ferrer J, José Bonete M. Stability and Enzymatic Studies of Glucose Dehydrogenase from the ArchaeonHaloferax mediterraneiin reverse micelles. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.1080/10242420310001643179] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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31
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Sjoholm KH, Cooney M, Minteer SD. Effects of degree of deacetylation on enzyme immobilization in hydrophobically modified chitosan. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2009.02.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Martin GL, Minteer SD, Cooney MJ. Spatial distribution of malate dehydrogenase in chitosan scaffolds. ACS APPLIED MATERIALS & INTERFACES 2009; 1:367-372. [PMID: 20353225 DOI: 10.1021/am800077t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work, confocal laser scanning microscopy was used to study the spatial distribution of malate dehydrogenase immobilized within three-dimensional macroporous chitosan scaffolds. The scaffolds were fabricated from solutions of native and hydrophobically modified chitosan polymer through the process of thermally induced phase separation. The hydrophobically modified chitosan is proposed to possess amphiphilic micelles into which the enzyme can be encapsulated and retained. To test this theory, we applied the immobilization procedure of Klotzbach and co-workers [J. Membr. Sci. 2006, 282 (1-2), 276-283] to solutions of fluorophore-tagged malate dehydrogenase in the presence of native and hydrophobically modified chitosan polymer and then tracked the distribution of enzymes in the resulting scaffolds using fluorescent microscopy. Results suggest that the modified chitosan does encapsulate the enzyme with a significant degree of retention and with altered distribution patterns, suggesting that hydrophobic modification of the chitosan polymer backbone does create amphiphilic regions that are capable of physically encapsulating and retaining enzymes. Commentary is also given on how this information can be correlated to enzyme activity and spatial distribution during immobilization processes.
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Affiliation(s)
- Georgianna L Martin
- Hawaii Natural Energy Institute, University of Hawaii, Honolulu, Hawaii 96822, USA
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33
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Zakharchenko NL, Ermakova EA, Zuev YF. Effect of trypsin microenvironment on the rate constants of elementary stages of the hydrolysis reaction of N α-Benzoyl-L-arginine ethyl ester. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2008; 34:404-8. [DOI: 10.1134/s1068162008030199] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Wilczura-Wachnik H, Yavuz AG, Myslinski A. Calorimetric study of the alpha-tocopherol solubility in reversed AOT micelles. J Colloid Interface Sci 2008; 319:520-5. [PMID: 18164308 DOI: 10.1016/j.jcis.2007.11.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 11/15/2007] [Accepted: 11/19/2007] [Indexed: 11/16/2022]
Abstract
The experimental data of heat of mixing (Q) for heterogeneous system alpha-tocopherol/AOT/n-heptane with and without water at 25 degrees C are presented. The Q dependence on AOT (sodium bis (2-ethylhexyl) sulfosuccinate) concentration, and R parameter defined as R=[H2O]/[AOT] with flow calorimetric method were investigated. Using the D'Aprano model (which is formally identical to that used earlier by Magid et al.) the binding constant (K), the distribution constant of alpha-tocopherol (K distr) between hydrocarbon and the micellar phase, and the standard enthalpy of transfer (DeltaH tr 0) of alpha-tocopherol from the hydrocarbon to AOT reversed micelles were calculated. The solubility of alpha-tocopherol in AOT reversed micelles explored with the calorimetric technique was compared to the literature data obtained respectively with UV spectrophotometry for reversed micelles and by other techniques for the phospholipid bilayer.
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Affiliation(s)
- H Wilczura-Wachnik
- Faculty of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland.
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35
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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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36
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Rodakiewicz-Nowak J, Ito M. Effect of AOT on enzymatic activity of the organic solvent resistant tyrosinase from Streptomyces sp. REN-21 in aqueous solutions and water-in-oil microemulsions. J Colloid Interface Sci 2006; 284:674-9. [PMID: 15780309 DOI: 10.1016/j.jcis.2004.10.052] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2004] [Accepted: 10/20/2004] [Indexed: 11/17/2022]
Abstract
The effect of AOT (sodium-bis(2-ethylhexyl sulfosuccinate)) on enzymatic activity of the organic solvent resistant tyrosinase (OSRT) in aqueous phosphate buffer solutions and in water-in-oil microemulsions of the water/AOT/isooctane system has been investigated. In contrast to mushroom tyrosinase, AOT does not activate OSRT in aqueous solutions, altering its activity very little at concentrations lower than 2 mM. Increasing contents of AOT in isooctane reduce the observed initial reaction rates of oxidation of t-butylcatechol (tBC) and 4-methylcatechol (4-MC). Similarly to mushroom tyrosinase, the effect has been described using an equation based on preferential binding of the substrates by surfactant interface layers. The apparent Michaelis-Menten substrate binding constants increase linearly with AOT concentration (with slopes of 0.12+/-0.02 and 0.051+/-0.006 for tBC and 4-MC, respectively), and the effective enzyme turnover number in the microemulsions remains practically constant.
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Affiliation(s)
- Janina Rodakiewicz-Nowak
- Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30 239 Kraków, Poland.
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37
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Zhang W, Huang X, Li Y, Qu Y, Gao P. Catalytic activity of lignin peroxidase and partition of veratryl alcohol in AOT/isooctane/toluene/water reverse micelles. Appl Microbiol Biotechnol 2006; 70:315-20. [PMID: 16080008 DOI: 10.1007/s00253-005-0048-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2004] [Revised: 05/12/2005] [Accepted: 05/30/2005] [Indexed: 10/25/2022]
Abstract
The activity of lignin peroxidase (LiP) and the partition of its optimum substrate veratryl alcohol (VA) in sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/isooctane/toluene/water reverse micelles were studied in this paper to understand the microheterogeneous effect of the medium on the catalytic properties of LiP hosted in the reverse micelle. Results showed that LiP from Phanerochaete chrysosporium could express its activity in the reverse micelles, but its activity depended, to a great extent, on the composition of the reverse micelles. Optimum activity occurred at a molar ratio of water to AOT (omega0) of 11, a pH value of 3.6, and a volume ratio of isooctane to toluene of 7-9. Under optimum conditions, the half-life of LiP was circa 12 h. The dependence of LiP activity on the volume fraction of water in the medium (theta), at a constant omega0 value of 11, indicated that VA was mainly solubilized in the pseudophase of the reverse micelle. Based on the pseudobiphasic model and the corresponding kinetic method, a linear line can be obtained in a plot of apparent Michaelis constant of VA vs theta, and the partition coefficient of VA between the pseudophase and the organic solvent phase was determined to be 35.8, which was higher than that (22.3) between bulk water and the corresponding mixed organic solvent. H2O2 inhibited LiP at concentrations higher than 80 microM; this concentration value seems to be different from that in aqueous solution (about 3 mM). The differences mentioned above should be ascribed to the microheterogeneity and the interface of the AOT reverse micelle.
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Affiliation(s)
- Wenjuan Zhang
- Key Lab for Colloid and Interface Chemistry of the Education Ministry of China, Shandong University, Jinan, 250100, People's Republic of China
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38
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Sarkar D, Khilar K, Begum G, SubbaRao P. Kinetics of basic hydrolysis of tris (1,10-phenanthroline) iron(11) in Triton X 100/hexanol/water reverse micelles in cyclohexane. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2005.05.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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39
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Meersman F, Dirix C, Shipovskov S, Klyachko NL, Heremans K. Pressure-induced protein unfolding in the ternary system AOT-octane-water is different from that in bulk water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:3599-3604. [PMID: 15807607 DOI: 10.1021/la0470481] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In a cellular environment, the presence of macromolecular cosolutes and membrane interfaces can influence the folding-unfolding behavior of proteins. Here we report on the pressure stability of alpha-chymotrypsin in the ternary system bis(2-ethylhexyl)sodium sulfosuccinate-octane-water using FTIR spectroscopy. The ternary system forms anionic reverse micelles which mimic cellular conditions. We find that inclusion of a single protein molecule in a reverse micelle does not alter its conformation. When pressurized in bulk water, alpha-chymotrypsin unfolds at 750 MPa into a partially unfolded structure. In contrast, in the ternary system, the same pressure increase induces a random coil-like unfolded state, which collapses into an amorphous aggregate during the decompression phase. It is suggested that the unfolding pathway is different in a cell-mimicking environment due to the combined effect of multiple factors, including confinement. A phase transition of the reverse micellar to the lamellar phase is thought to be essential to provide the conditions required for unfolding and aggregation, though the unfolding is not a direct result of the phase transition. Our observations therefore suggest that membranes may cause the formation of alternative conformations that are more susceptible to aggregation.
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Affiliation(s)
- Filip Meersman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.
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40
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Chakraborty S, Sahoo B, Teraoka I, Miller LM, Gross RA. Enzyme-Catalyzed Regioselective Modification of Starch Nanoparticles. Macromolecules 2004. [DOI: 10.1021/ma048842w] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Soma Chakraborty
- NSF Center for Biocatalysis and Bioprocessing of Macromolecules, Othmer Department of Chemical and Biological Science and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
| | - Bishwabhusan Sahoo
- NSF Center for Biocatalysis and Bioprocessing of Macromolecules, Othmer Department of Chemical and Biological Science and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
| | - Iwao Teraoka
- NSF Center for Biocatalysis and Bioprocessing of Macromolecules, Othmer Department of Chemical and Biological Science and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
| | - Lisa M. Miller
- NSF Center for Biocatalysis and Bioprocessing of Macromolecules, Othmer Department of Chemical and Biological Science and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
| | - Richard A. Gross
- NSF Center for Biocatalysis and Bioprocessing of Macromolecules, Othmer Department of Chemical and Biological Science and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, and National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
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41
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Luchter-Wasylewska E, Iciek M. Positive cooperativity in substrate binding of human prostatic acid phosphatase entrapped in AOT–isooctane–water reverse micelles. J Colloid Interface Sci 2004; 273:632-7. [PMID: 15082403 DOI: 10.1016/j.jcis.2004.01.075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2003] [Accepted: 01/29/2004] [Indexed: 10/26/2022]
Abstract
The kinetics of 1-naphthyl phosphate and phenyl phosphate hydrolysis, catalyzed by human prostatic acid phosphatase (PAP) entrapped in AOT-isooctane-water reverse micelles, has been studied over surfactant hydration degree (w0) range 5 to 35. Continuous spectrophotometric acid phosphatase assays, previously prepared, were employed. PAP was catalytically active over the whole w0 studied range. In order to determine steady-state reaction constants the experimental data were fitted to Hill rate equation. Positive cooperativity in substrate binding was observed, as it was earlier found in aqueous solutions. The extent of cooperativity (expressed as the value of the Hill cooperation coefficient h) increased from 1 to 4, when the micellar water-pool size was growing, at fixed enzyme concentration. In the plots of catalytic activity (kcat) versus w0, the maxima have been found at w0=10 (pH 5.6) and 23 (pH 3.8). It is suggested that catalytically active monomeric and dimeric PAP forms are entrapped in reverse micelles of w0=10 and 23, respectively.
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Affiliation(s)
- Ewa Luchter-Wasylewska
- Institute of Medical Biochemistry, Jagiellonian University, Collegium Medicum, Kopernika 7, 31-034 Kraków, Poland.
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42
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Lopez F, Cinelli G, Ambrosone L, Colafemmina G, Ceglie A, Palazzo G. Role of the cosurfactant in water-in-oil microemulsion: interfacial properties tune the enzymatic activity of lipase. Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2004.01.027] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Jing F, An X, Shen W. The characteristics of hydrolysis of triolein catalyzed by wheat germ lipase in water-in-oil microemulsions. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1177(03)00072-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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44
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Andrade SLA, Brondino CD, Kamenskaya EO, Levashov AV, Moura JJG. Kinetic behavior of Desulfovibrio gigas aldehyde oxidoreductase encapsulated in reverse micelles. Biochem Biophys Res Commun 2003; 308:73-8. [PMID: 12890482 DOI: 10.1016/s0006-291x(03)01337-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We report the kinetic behavior of the enzyme aldehyde oxidoreductase (AOR) from the sulfate reducing bacterium Desulfovibrio gigas (Dg) encapsulated in reverse micelles of sodium bis-(2-ethylhexyl) sulfosuccinate in isooctane using benzaldehyde, octaldehyde, and decylaldehyde as substrates. Dg AOR is a 200-kDa homodimeric protein that catalyzes the conversion of aldehydes to carboxylic acids. Ultrasedimentation analysis of Dg AOR-containing micelles showed the presence of 100-kDa molecular weight species, confirming that the Dg AOR subunits can be dissociated. UV-visible spectra of encapsulated Dg AOR are indistinguishable from the enzyme spectrum in solution, suggesting that both protein fold and metal cofactor are kept intact upon encapsulation. The catalytic constant (k(cat)) profile as a function of the micelle size W(0) (W(0)=[H(2)O]/[AOT]) using benzaldehyde as substrate showed two bell-shaped activity peaks at W(0)=20 and 26. Furthermore, enzymatic activity for octaldehyde and decylaldehyde was detected only in reverse micelles. Like for the benzaldehyde kinetics, two peaks with both similar k(cat) values and W(0) positions were obtained. EPR studies using spin-labeled reverse micelles indicated that octaldehyde and benzaldehyde are intercalated in the micelle membrane. This suggests that, though Dg AOR is found in the cytoplasm of bacterial cells, the enzyme may catalyze the reaction of substrates incorporated into a cell membrane.
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Affiliation(s)
- Susana L A Andrade
- REQUIMTE/CQFB, Departamento de Qui;mica, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica 2829-516, Portugal
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Klyachko NL, Levashov AV. Bioorganic synthesis in reverse micelles and related systems. Curr Opin Colloid Interface Sci 2003. [DOI: 10.1016/s1359-0294(03)00016-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Marhuenda-Egea FC, Piera-Velázquez S, Cadenas C, Cadenas E. Reverse micelles in organic solvents: a medium for the biotechnological use of extreme halophilic enzymes at low salt concentration. ARCHAEA (VANCOUVER, B.C.) 2002; 1:105-11. [PMID: 15803648 PMCID: PMC2685557 DOI: 10.1155/2002/626457] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2001] [Accepted: 03/08/2002] [Indexed: 11/17/2022]
Abstract
Alkaline p-nitrophenylphosphate phosphatase (pNPPase) from the halophilic archaeobacterium Halobacterium salinarum (previously halobium) was solubilized at low salt concentration in reverse micelles of hexadecyltrimethyl-ammoniumbromide in cyclohexane with 1-butanol as co-surfactant. The enzyme maintained its catalytic properties under these conditions. The thermodynamic "solvation-stabilization hypothesis" has been used to explain the bell-shaped dependence of pNPPase activity on the water content of reverse micelles, in terms of protein-solvent interactions. According to this model, the stability of the folded protein depends on a network of hydrated ions associated with acidic residues at the protein surface. At low salt concentration and low water content (the ratio of water concentration to surfactant concentration; w0), the network of hydrated ions within the reverse micelles may involve the cationic heads of the surfactant. The bell-shaped profile of the relationship between enzyme activity and w0 varied depending on the concentrations of NaCl and Mn2+.
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Andrade SL, Moura JJ. Hydrogen evolution and consumption in AOT–isooctane reverse micelles by Desulfovibrio gigas hydrogenase. Enzyme Microb Technol 2002. [DOI: 10.1016/s0141-0229(02)00076-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shin I, Wachtel E, Roth E, Bon C, Silman I, Weiner L. Thermal denaturation of Bungarus fasciatus acetylcholinesterase: Is aggregation a driving force in protein unfolding? Protein Sci 2002; 11:2022-32. [PMID: 12142456 PMCID: PMC2373691 DOI: 10.1110/ps.0205102] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A monomeric form of acetylcholinesterase from the venom of Bungarus fasciatus is converted to a partially unfolded molten globule species by thermal inactivation, and subsequently aggregates rapidly. To separate the kinetics of unfolding from those of aggregation, single molecules of the monomeric enzyme were encapsulated in reverse micelles of Brij 30 in 2,2,4-trimethylpentane, or in large unilamellar vesicles of egg lecithin/cholesterol at various protein/micelle (vesicle) ratios. The first-order rate constant for thermal inactivation at 45 degrees C, of single molecules entrapped within the reverse micelles (0.031 min(-1)), was higher than in aqueous solution (0.007 min(-1)) or in the presence of normal micelles (0.020 min(-1)). This clearly shows that aggregation does not provide the driving force for thermal inactivation of BfAChE. Within the large unilamellar vesicles, at average protein/vesicle ratios of 1:1 and 10:1, the first-order rate constants for thermal inactivation of the encapsulated monomeric acetylcholinesterase, at 53 degrees C, were 0.317 and 0.342 min(-1), respectively. A crosslinking technique, utilizing the photosensitive probe, hypericin, showed that thermal denaturation produces a distribution of species ranging from dimers through to large aggregates. Consequently, at a protein/vesicle ratio of 10:1, aggregation can occur upon thermal denaturation. Thus, these experiments also demonstrate that aggregation does not drive the thermal unfolding of Bungarus fasciatus acetylcholinesterase. Our experimental approach also permitted monitoring of recovery of enzymic activity after thermal denaturation in the absence of a competing aggregation process. Whereas no detectable recovery of enzymic activity could be observed in aqueous solution, up to 23% activity could be obtained for enzyme sequestered in the reverse micelles.
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Affiliation(s)
- I Shin
- Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel
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Marhuenda-Egea FC, Piera-Velázquez S, Cadenas C, Cadenas E. Mechanism of adaptation of an atypical alkaline p-nitrophenyl phosphatase from the archaeon Halobacterium salinarum at low-water environments. Biotechnol Bioeng 2002; 78:497-502. [PMID: 12115118 DOI: 10.1002/bit.10216] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Enzymes suspended in organic solvents represent a versatile system for studying the involvement of water in catalytic properties and their flexibility in adapting to different environmental conditions. The extremely halophilic alkaline p-nitrophenylphosphate phosphatase from the archaeon Halobacterium salinarum was solubilized in an organic medium consisting of reversed micelles of hexadecyltrimethylammoniumbromide in cyclohexane, with 1-butanol as cosurfactant. Hydrolysis of p-nitrophenylphosphate was nonlinear with time when the enzyme was microinjected into reversed micelles that contained substrate. These data are consistent with a kinetic model in which the enzyme is irreversibly converted from an initial form to a final stable form during the first seconds of the encapsulation process. The model features a rate constant (k) for that transition and separate hydrolysis rates, v(1) and v(2), for the two forms of the enzyme. The enzyme conversion may be governed by the encapsulation process.
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Affiliation(s)
- Frutos C Marhuenda-Egea
- División de Bioquímica, Facultad de Ciencias, Universidad de Alicante, Aptdo. 99, 03080 Alicante, Spain.
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Marhuenda-Egea FC, Piera-Velázquez S, Cadenas C, Cadenas E. An extreme halophilic enzyme active at low salt in reversed micelles. J Biotechnol 2002; 93:159-64. [PMID: 11738722 DOI: 10.1016/s0168-1656(01)00392-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Possible biotechnological applications of extreme halophilic enzymes are strongly determined by their high salt requirement of around 4 M NaCl. Consequently, the use of these in organic media seemed to be unlikely. However, we have succeeded in dissolving a halophilic enzyme, p-nitrophenylphosphate phosphatase from the archaeon Halobacterium salinarum, in an organic medium by creating a reverse micellar system with very low salt concentration. The enzyme retained its catalytic properties in reversed micelles made with an anionic surfactant (dioctyl sodium sulphosuccinate) or with a cationic surfactant (hexadecyltrimethylammonium bromide) in cyclohexane plus 1-butanol as co-surfactant. The dependence of the rate of hydrolysis of p-nitrophenylphosphate phosphate on the molar water/surfactant ratio (w(0) value) showed a bell-shaped curve for each surfactant system. Kinetic parameters were determined in each system. The enzymatic reaction appeared to follow Michaelis-Menten kinetics with the anionic surfactant only. The kinetic behaviour was determined at different concentrations of Mn(2+) in reversed micelles of dioctyl sodium sulphosuccinate as surfactant.
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Affiliation(s)
- Frutos C Marhuenda-Egea
- División de Bioquímica, Facultad de Ciencias, Universidad de Alicante, Apt. 99, 03080 Alicante, Spain.
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