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Daneshjou S, Dabirmanesh B, Rahimi F, Jabbari S, Khajeh K. Catalytic parameters and thermal stability of chondroitinase ABCI on red porous silicon nanoparticles. J Biotechnol 2020; 324:83-90. [PMID: 32979433 DOI: 10.1016/j.jbiotec.2020.09.020] [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: 01/15/2020] [Revised: 08/02/2020] [Accepted: 09/21/2020] [Indexed: 12/21/2022]
Abstract
The bacterial enzyme chondroitinase ABC, which digests extracellular chondroitin sulfate proteoglycans, has been shown to enhance axonal regeneration. However, the utilization of this enzyme as therapeutics is notably restricted due to its thermal instability. Therefore, red luminescent porous silicon that hold promise for potential applications in biological/medical imaging was used as a carrying matrix for chondroitinase with the aim of enhancing its stability. Porous Si nanoparticles were prepared by electrochemical etching of silicon wafers in ethanolic HF solution. The size of nanoparticles (210 nm) and the mean pore diameter (8 -20 nm) were determined using dynamic light scattering and scanning electron microscopy. Purified chondroitinase was then incorporated into the silicon pores. Results revealed similar Km and lower Vmax value for the immobilized enzyme when compared with the free enzyme. The immobilized chondroitinase exhibited about a 4 fold increase in stability at 37 °C after 50 min. It is likely possible that, the enzyme was protected inside the pores resulted in higher stability. Moreover, porous silicon was seen to be capable of holding the chondroitinase for repeated cyclic tests for three times. The cell viability assay exhibited no significant cytotoxicity for Psi-chondroitinase up to 24 h.
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Affiliation(s)
- Sara Daneshjou
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran.
| | | | - Fereshteh Rahimi
- University of Tehran, Faculty of New Sciences and Technologies, Tehran, Iran
| | - Safoura Jabbari
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran
| | - Khosro Khajeh
- Tarbiat Modares University, Faculty of Biological Science, Tehran, Iran
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Molinas MF, Benavides L, Castro MA, Murgida DH. Stability, redox parameters and electrocatalytic activity of a cytochrome domain from a new subfamily. Bioelectrochemistry 2015; 105:25-33. [DOI: 10.1016/j.bioelechem.2015.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 04/21/2015] [Accepted: 05/03/2015] [Indexed: 11/24/2022]
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Capdevila DA, Marmisollé WA, Tomasina F, Demicheli V, Portela M, Radi R, Murgida DH. Specific methionine oxidation of cytochrome c in complexes with zwitterionic lipids by hydrogen peroxide: potential implications for apoptosis. Chem Sci 2014; 6:705-713. [PMID: 30154994 PMCID: PMC6085654 DOI: 10.1039/c4sc02181a] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 09/01/2014] [Indexed: 11/21/2022] Open
Abstract
The rise of H2O2 concentration that characterizes the initiation of apoptosis can specifically oxidize Met80 in cytochrome c bound to zwitterionic phospholipids, yielding a stable peroxidase.
Cytochrome c (Cyt-c) has been previously shown to participate in cardiolipin (CL) oxidation and, therefore, in mitochondrial membrane permeabilization during the early events of apoptosis. The gain in this function has been ascribed to specific CL/Cyt-c interactions. Here we report that the cationic protein Cyt-c is also able to interact electrostatically with the main lipid components of the mitochondrial membranes, the zwitterionic lipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE), through the mediation of phosphate anions that bind specifically to amino groups in the surfaces of protein and model membranes. In these complexes, Cyt-c reacts efficiently with H2O2 at submillimolar levels, which oxidizes the sulfur atom of the axial ligand Met80. The modified protein is stable and presents significantly enhanced peroxidatic activity. Based on these results, we postulate that the rise of H2O2 concentrations to the submillimolar levels registered during initiation of the apoptotic program may represent one signaling event that triggers the gain in peroxidatic function of the Cyt-c molecules bound to the abundant PE and PC membrane components. As the activated protein is a chemically stable species, it can potentially bind and oxidize important targets, such as CL.
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Affiliation(s)
- Daiana A Capdevila
- Departamento de Química Inorgánica , Analítica y Química Física and INQUIMAE (CONICET-UBA) , Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria , Pab. 2, piso 1 , C1428EHA-Buenos Aires , Argentina .
| | - Waldemar A Marmisollé
- Departamento de Química Inorgánica , Analítica y Química Física and INQUIMAE (CONICET-UBA) , Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria , Pab. 2, piso 1 , C1428EHA-Buenos Aires , Argentina .
| | - Florencia Tomasina
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research , Facultad de Medicina , Universidad de la República , Montevideo , Uruguay
| | - Verónica Demicheli
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research , Facultad de Medicina , Universidad de la República , Montevideo , Uruguay
| | - Magdalena Portela
- Unidad de Bioquímica y Proteómica Analíticas , Institut Pasteur de Montevideo , Montevideo , Uruguay
| | - Rafael Radi
- Departamento de Bioquímica and Center for Free Radical and Biomedical Research , Facultad de Medicina , Universidad de la República , Montevideo , Uruguay
| | - Daniel H Murgida
- Departamento de Química Inorgánica , Analítica y Química Física and INQUIMAE (CONICET-UBA) , Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria , Pab. 2, piso 1 , C1428EHA-Buenos Aires , Argentina .
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Sahare P, Ayala M, Vazquez-Duhalt R, Agrawal V. Immobilization of peroxidase enzyme onto the porous silicon structure for enhancing its activity and stability. NANOSCALE RESEARCH LETTERS 2014; 9:409. [PMID: 25221454 PMCID: PMC4151278 DOI: 10.1186/1556-276x-9-409] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 07/08/2014] [Indexed: 06/03/2023]
Abstract
In this work, a commercial peroxidase was immobilized onto porous silicon (PS) support functionalized with 3-aminopropyldiethoxysilane (APDES) and the performance of the obtained catalytic microreactor was studied. The immobilization steps were monitored and the activity of the immobilized enzyme in the PS pores was spectrophotometrically determined. The enzyme immobilization in porous silicon has demonstrated its potential as highly efficient enzymatic reactor. The effect of a polar organic solvent (acetonitrile) and the temperature (up to 50°C) on the activity and stability of the biocatalytic microreactor were studied. After 2-h incubation in organic solvent, the microreactor retained 80% of its initial activity in contrast to the system with free soluble peroxidase that lost 95% of its activity in the same period of time. Peroxidase immobilized into the spaces of the porous silicon support would be perspective for applications in treatments for environmental security such as removal of leached dye in textile industry or in treatment of different industrial effluents. The system can be also applied in the field of biomedicine.
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Affiliation(s)
- Padmavati Sahare
- Centro de Investigacion en Ingenieria y Ciencias Aplicadas, UAEM, Av.
Universidad 1001, Cuernavaca, Morelos 62209, México
| | - Marcela Ayala
- Instituto de Biotecnología Universidad Nacional Autónoma de
México, Av. Universidad 2001, Cuernavaca, Morelos 62250,
México
| | - Rafael Vazquez-Duhalt
- Centro de Nanociencias y Nanotecnología, Universidad Nacional
Autónoma de México, Km 107 Carretera Tijuana-Ensenada, Apdo Postal
14, CP. 22800 Ensenada, B.C., México
| | - Vivechana Agrawal
- Centro de Investigacion en Ingenieria y Ciencias Aplicadas, UAEM, Av.
Universidad 1001, Cuernavaca, Morelos 62209, México
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Peroxidase activity of a myoglobin mutant with three distal histidines forming a metal-binding site: Implications for the cross-reactivity of cytochrome c oxidase. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2013.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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