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Dib N, Girardi VR, Silber JJ, Correa NM, Falcone RD. How the external solvent in biocompatible reverse micelles can improve the alkaline phosphatase behavior. Org Biomol Chem 2021; 19:4969-4977. [PMID: 34002175 DOI: 10.1039/d0ob02371j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the last decade, the nature of the nonpolar solvents that can be part of reverse micelles (RMs) has been the topic of several investigations to improve their applications. In this sense, the hydrolysis of 1-naphthyl phosphate catalyzed by the enzyme alkaline phosphatase (AP) was used as a probe to investigate the effect of the change of the external solvent on RMs formulated with the anionic surfactant sodium diethylhexyl sulfosuccinate (AOT). As external nonpolar solvents, two biocompatible lipophilic esters, isopropyl myristate and methyl laurate, and the traditional nonpolar solvents, n-heptane and benzene, were used. The results were compared among the RMs investigated and with the reaction in homogeneous media. Thus, the effect of the nanoconfinement as well as the impact of the replacement of a conventional external nonpolar solvent by biocompatible solvents were analyzed. The results indicate that the catalytic efficiency in the AOT RMs is larger than that in homogeneous media, denoting a different hydration level over the AP enzyme, which is directly related to the different degrees of nonpolar solvent penetration to the RM interface. Our findings demonstrated that toxic solvents such as n-heptane and benzene can be replaced by nontoxic ones (isopropyl myristate or methyl laurate) in AOT RMs without affecting the performance of micellar systems as nanoreactors, making them a green and promising alternative toward efficient and sustainable chemistry.
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Affiliation(s)
- Nahir Dib
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - Valeria R Girardi
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - R Dario Falcone
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
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Held C, Stolzke T, Knierbein M, Jaworek MW, Luong TQ, Winter R, Sadowski G. Cosolvent and pressure effects on enzyme-catalysed hydrolysis reactions. Biophys Chem 2019; 252:106209. [DOI: 10.1016/j.bpc.2019.106209] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/18/2019] [Accepted: 06/18/2019] [Indexed: 12/13/2022]
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3
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Modulation of anionic reverse micellar interface with non-ionic surfactants can regulate enzyme activity within the micellar waterpool. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3829-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Dandapat M, Mandal D. Photoisomerization and reorientational dynamics of DTDCI in AOT/alkane reverse micelles containing non-aqueous polar liquids. Photochem Photobiol Sci 2014; 14:378-86. [PMID: 25415433 DOI: 10.1039/c4pp00326h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular mobility of the symmetric carbocyanine fluorophore DTDCI was studied in AOT/alkane reverse micelles containing non-aqueous polar liquids DMF, formamide, ethylene glycol and glycerol by monitoring both the torsional photoisomerization and rotational reorientation, both of which were sensitive to microviscosity of the local environment. The DTDCI fluorophore resides completely within the AOT-polar liquid reverse micelle nano-droplets, where its dynamics were found to be significantly retarded irrespective of the polar liquid taken, due to a combination of electrostatic and hydrophobic forces that induce the guest DTDC(+) cation to attach to the AOT molecules of the host droplet. The addition of strong hydrogen-bond donating polar liquids like formamide, ethylene glycol and glycerol causes a systematic enlargement of the droplets. Rotational dynamics of the fluorophore inside the nano-droplets was characterized by a diffusion coefficient comparable to that in highly viscous solvents like ethylene glycol.
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Affiliation(s)
- Manika Dandapat
- Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700 009, India.
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5
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Superactivity induced by micellar systems as the key for boosting the yield of enzymatic reactions. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcatb.2014.06.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Correa NM, Silber JJ, Riter RE, Levinger NE. Nonaqueous Polar Solvents in Reverse Micelle Systems. Chem Rev 2012; 112:4569-602. [DOI: 10.1021/cr200254q] [Citation(s) in RCA: 204] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Juana J. Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Ruth E. Riter
- Department of Chemistry, Agnes Scott College, Decatur, Georgia 30030-3770, United
States
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
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7
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Kumar A, Venkatesu P. Overview of the stability of α-chymotrypsin in different solvent media. Chem Rev 2012; 112:4283-307. [PMID: 22506806 DOI: 10.1021/cr2003773] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Kumar A, Attri P, Venkatesu P. Trehalose protects urea-induced unfolding of α-chymotrypsin. Int J Biol Macromol 2010; 47:540-5. [DOI: 10.1016/j.ijbiomac.2010.07.013] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 07/28/2010] [Accepted: 07/28/2010] [Indexed: 10/19/2022]
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9
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Moyano F, Falcone R, Mejuto J, Silber J, Correa N. Cationic Reverse Micelles Create Water with Super Hydrogen-Bond-Donor Capacity for Enzymatic Catalysis: Hydrolysis of 2-Naphthyl Acetate by α-Chymotrypsin. Chemistry 2010; 16:8887-93. [DOI: 10.1002/chem.201000437] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Attri P, Venkatesu P, Lee MJ. Influence of Osmolytes and Denaturants on the Structure and Enzyme Activity of α-Chymotrypsin. J Phys Chem B 2010; 114:1471-8. [DOI: 10.1021/jp9092332] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pankaj Attri
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Pannuru Venkatesu
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Ming-Jer Lee
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
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Venkatesu P, Lee MJ, Lin HM. Osmolyte counteracts urea-induced denaturation of alpha-chymotrypsin. J Phys Chem B 2009; 113:5327-38. [PMID: 19354310 DOI: 10.1021/jp8113013] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stability of proteins is reduced by urea, which is methylamine and nonprotecting osmolyte; eventually urea destabilizes the activity and function and alters the structure of proteins, whereas the stability of proteins is raised by the osmolytes, which are not interfering with the functional activity of proteins. The deleterious effect of urea on proteins has been counteracted by methylamines (osmolytes), such as trimethylamine N-oxide (TMAO), betaine, and sarcosine. To distinctly enunciate the comparison of the counteracting effects between these methylamines on urea-induced denaturation of alpha-chymotrypsin (CT), we measured the hydrodynamic diameter (d(H)) and the thermodynamic properties (T(m), DeltaH, DeltaG(U), and DeltaC(p)) with dynamic light scattering (DLS) and differential scanning calorimeter (DSC), respectively. The present investigation compares the compatibility and counteracting hypothesis by determining the effects of methylamines and urea, as individual components and in combination at a concentration ratio of 1:2 (methylamine:urea) as well as various urea concentrations (0.5-5 M) in the presence of 1 M methylamine. The experimental results revealed that the naturally occurring osmolytes TMAO, betaine, and sarcosine strongly counteracted the urea actions on alpha-chymotrypsin. The results also indicated that TMAO counteracting the urea effects on CT was much stronger than betaine or sarcosine.
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Affiliation(s)
- Pannur Venkatesu
- Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan.
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12
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Wang P. Multi-scale features in recent development of enzymic biocatalyst systems. Appl Biochem Biotechnol 2008; 152:343-52. [PMID: 18574568 DOI: 10.1007/s12010-008-8243-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Accepted: 03/31/2008] [Indexed: 12/01/2022]
Abstract
Functional relation among elements of different size scales in a system is probably a main challenge across the areas of the science of engineering ever since their emergence. Multi-scale time and size correlation for description and prediction of complex systems, however, has been systematically examined only recently with the aid of new computational tools. In the pursuit of efficient and sustainable chemical processing technologies, people have seen a growing emphasis on synthetic biotechnology in recent R&D efforts. In particular, industrial enzyme technologies are attracting enormous attention. Having been traditionally developed for food and detergent applications, industrial enzyme technologies are being re-examined and tested to their limits to keep abreast of the challenges in drug, biochemical, and the emerging biorenewable energy industries. Toward that, enzymes are required to function in non-conventional conditions, such as organic solvents, extreme pH, and temperatures; they also have to compete against alternative chemical technologies in terms of costs and efficiency. Accordingly, enzymic biocatalyst systems are being tackled dynamically at all size levels through efforts ranging from molecular level protein engineering and modification, nanoscale structure fabrication, and microenvironment manipulation to the construction of microchip devices and macroscopic industrial bioreactors and devices. These efforts are probably still on a case-to-case trial basis without much consideration of cross-scale correlations. Discovering, understanding, and controlling of the common features that relate functions of biocatalysts at different size scales may eventually be realized in future.
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Affiliation(s)
- Ping Wang
- Department of Bioproducts and Biosystems Engineering, Biotechnology Institute, University of Minnesota, St. Paul, MN 55108, USA.
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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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Demirhan E, Apar DK, Özbek B. EFFECT OF IMPELLER SPEED AND VISCOSITY ON WHEY LACTOSE HYDROLYSIS AND β-GALACTOSIDASE STABILITY. CHEM ENG COMMUN 2007. [DOI: 10.1080/00986440701293298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Falcone RD, Biasutti MA, Correa NM, Silber JJ, Lissi E, Abuin E. Effect of the addition of a nonaqueous polar solvent (glycerol) on enzymatic catalysis in reverse micelles. Hydrolysis of 2-naphthyl acetate by alpha-chymotrypsin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:5732-7. [PMID: 16459586 DOI: 10.1021/la036243x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The kinetics of hydrolysis of 2-naphthyl acetate (2-NA) catalyzed by alpha-chymotrypsin (alpha-CT), in reverse micellar solutions formed by glycerol (GY)-water (38% v/v) mixture/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/n-heptane has been determined by spectroscopic measurements. To compare the efficiency of this reaction with that observed in micelles with water in the core, as well as in the corresponding homogeneous media, the reaction was also studied in water/AOT/n-heptane reverse micellar solutions and in both homogeneous media (water and GY-water, 38% v/v mixture). In every media, alpha-CT was characterized by the absorption and emission spectra, the fluorescence lifetimes, and the fluorescence anisotropy of its tryptophan residues. The effect of AOT concentration on the kinetic parameters obtained in the micellar systems was determined, at a constant molar ratio of the inner polar solvent and surfactant. Moreover, the data obtained allowed the evaluation of the 2-NA partition constant between the organic and the micellar pseudophase. It is shown that the addition of GY to the micelle interior results in an increase in the catalytic properties of alpha-CT. The fluorescence anisotropy studies in the different media show that the addition of GY increases the viscosity as compared with the aqueous systems. It seems that the GY addition to the reverse micellar aggregates results in a decrease of the conformational mobility of alpha-CT, which leads to an increase of the enzyme stability and activity.
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Affiliation(s)
- R Darío Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal N 3 (5800) Río Cuarto, Argentina
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18
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Celej MS, D'Andrea MG, Campana PT, Fidelio GD, Bianconi ML. Superactivity and conformational changes on alpha-chymotrypsin upon interfacial binding to cationic micelles. Biochem J 2004; 378:1059-66. [PMID: 14641111 PMCID: PMC1224008 DOI: 10.1042/bj20031536] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2003] [Revised: 11/20/2003] [Accepted: 11/27/2003] [Indexed: 11/17/2022]
Abstract
The catalytic behaviour of alpha-CT (alpha-chymotrypsin) is affected by cationic micelles of CTABr (hexadecyltrimethylammonium bromide). The enzyme-micelle interaction leads to an increase in both the V(max) and the affinity for the substrate p -nitrophenyl acetate, indicating higher catalytic efficiency for bound alpha-CT. The bell-shaped profile of alpha-CT activity with increasing CTABr concentrations suggests that the micelle-bound enzyme reacts with the free substrate. Although more active with CTABr micelles, the enzyme stability is essentially the same as observed in buffer only. Enzyme activation is accompanied by changes in alpha-CT conformation. Changes in tertiary structure were observed by the increase in intensity and the red shift in the alpha-CT tryptophan fluorescence spectrum, suggesting the annulment of internal quenching and a more polar location of tryptophan residues. Near-UV CD also indicated the transfer of aromatic residues to a more flexible environment. CTABr micelles also induces an increase in alpha-helix, as seen by far-UV CD and FTIR (Fourier-transform infrared) spectroscopies. The far-UV CD spectrum of alpha-CT shows an increase in the intensity of the positive band at 198 nm and in the negative band at 222 nm, indicating an increased alpha-helical content. This is in agreement with FTIR studies, where an increase in the band at 1655 cm(-1), corresponding to the alpha-helix, was shown by fitting analysis and difference spectroscopy. Spectral deconvolution indicated a reduction in the beta-sheet content in micelle-bound alpha-CT. Our data suggest that the higher catalytic efficiency of micelle-bound alpha-CT results from significant conformational changes.
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Affiliation(s)
- M Soledad Celej
- Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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Viparelli P, Alfani F, Gallifuoco A, Cantarella M. Effect of quaternary ammonium salts on the hydrolysis of N-glutaryl-l-phenylalanine catalysed by α-chymotrypsin. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcatb.2004.02.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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SDS-induced conformational transitions of ervatamin B: evidence of greater stability of α-rich domain compared to β-rich domain of the SDS derived state. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(03)00160-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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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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Masson P, Tonello C, Balny C. High-Pressure Biotechnology in Medicine and Pharmaceutical Science. J Biomed Biotechnol 2001; 1:85-88. [PMID: 12488614 PMCID: PMC113776 DOI: 10.1155/s1110724301000158] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
High-pressure (HP) biotechnology is an emerging technique initially applied for food processing and more recently in pharmaceutical and medical sciences. Pressure can stabilize enzymes and modulate both their activity and specificity. HP engineering of proteins may be used for enzyme-catalyzed synthesis of fine chemicals, pharmaceuticals, and production of modified proteins of medical or pharmaceutical interest. HP inactivation of biological agents is expected to be applicable to sterilization of fragile biopharmaceuticals, or medical compounds. The enhanced immunogenicity of some pressure-killed bacteria and viruses could be applied for making new vaccines. Finally, storage at subzero temperatures without freezing is another potential application of HP for cells, animal tissues, blood cells, organs for transplant, and so forth.
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Affiliation(s)
- Patrick Masson
- Centre de Recherches du Service de Santé des Armées, Département de Toxicologie, Unité d'Enzymologie, BP 87, 38702 La Tronche cédex, France
| | - Carole Tonello
- Hautes Pressions Technologies, Chemin des Romains, 55000 Bar le Duc, France
| | - Claude Balny
- INSERM U128, IFR24, CNRS, 1919, route de Mende 34293
Montpellier Cédex 5, France
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23
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The influence of the binding of low molecular weight surfactants on the thermal stability and secondary structure of IgG. Colloids Surf A Physicochem Eng Asp 2000. [DOI: 10.1016/s0927-7757(99)00332-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Athès V, Guerra P, Combes D. Effect of soluble additives on enzyme thermo- and/or baro-deactivation. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s1381-1177(99)00017-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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25
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Klyachko NL, Levashov PA, Levashov AV, Balny C. Pressure regulation of malic dehydrogenase in reversed micelles. Biochem Biophys Res Commun 1999; 254:685-8. [PMID: 9920801 DOI: 10.1006/bbrc.1998.9993] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Malic dehydrogenase (MDH) studied in water and reversed micelles upon pressure application revealed a difference in catalysis. Whereas MDH in water appeared to be not sensitive to the pressure increasing, the catalytic activity of MDH in reversed micelles showed bell-shaped dependencies both on pressure and surfactant hydration degree, w0. The catalytic activity of MDH was found to be maximal under moderate pressure equal to 300-500 bar and at w0 approximately 14 with the difference between lowest and highest levels of the catalytic activity amounted to about 10 times. The work presented demonstrates for the first time the co-operative effect of reversed micelles and pressure application to malic dehydrogenase leading to the enzyme regulation that cannot be realized in aqueous solution.
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Affiliation(s)
- N L Klyachko
- Department of Chemical Enzymology, Faculty of Chemistry, Moscow State University, Moscow, 119899, Russia
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26
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Athès V, Combes D. Effect of high hydrostatic pressure on enzyme stability. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0921-0423(98)80031-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
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