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UVB light influence on the laccase enzyme catalytic activity in reverse micelles and in homogeneous aqueous medium

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Abstract

Laccase is a versatile enzyme widely used for the oxidation of environmental contaminants and exhibits great potential in many others applications; however, it undergoes photo-degradation when irradiated with UVB light. The photo-stability of this biomolecule can be improved by immobilization in different encapsulation media and reverse micelles have been employed with this purpose. The laccase activity using syringaldazine as substrate has been studied in the absence and in the presence of reverse micelles of 0.15 M of sodium 1,4-bis (2-ethylhexyl) sulfosuccinate (AOT) in isooctane at W0 ([H2O]/[AOT]) = 30, before and after irradiation of the enzyme with UVB light. The kinetic parameters, i.e., Michaelis–Menten constant (KM), catalytic constant (kCAT), and catalytic efficiency (kCAT/KM), were determined by spectroscopic measurements in the micellar system and in homogeneous aqueous medium. The distribution of the substrate in two pseudo-phases (micelle and organic solvent) was taking into account in the kinetic parameters’ determinations. The results obtained indicate that the nano-aggregate system confers a solubilization media in the water core of the micelle, both for the enzyme and the substrate, in which the catalytic function of the enzyme is preserved. On the other hand, in homogeneous aqueous medium kCAT/KM value, it is reduced by ~50% after UVB irradiation of the enzyme, while in micellar medium, less than 10% of the activity was affected. This mean that the enzyme achieves a considerably photo-protection when it is irradiated with UVB light in reverse micelles as compared with the homogeneous aqueous medium. This phenomenon can be mainly due to the confinement of the biomolecule inside the micelle. Physical properties of the nano-environment could affect photochemical reactions.

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Acknowledgements

Financial support from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Secretaría de Ciencia y Técnica de la Universidad Nacional de Río Cuarto (SECyT, UNRC), both from Argentina, is gratefully acknowledged. Eugenia Reynoso, M. Alicia Biasutti, and Hernán A. Montejano are permanent research staff of CONICET; Facundo Parodi would like to thank CONICET for doctoral scholarships. R. Daniel Cacciari would like to thank CONICET for post-doctoral scholarships. Jeremías N. Mazalú would like to thank SECyT-UNRC for undergraduate scholarships.

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FP, RDC, JNM, HAM, ER, and MAB: investigation; FP, RDC, and JNM: experimental and data analysis; HAM, ER, and MAB: original draft preparation; ER and MAB: writing and editing; ER and MAB: supervision; MAB: project administration. All authors reviewed the manuscript.

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Correspondence to Eugenia Reynoso or M. Alicia Biasutti.

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Parodi, F., Cacciari, R.D., Mazalu, J.N. et al. UVB light influence on the laccase enzyme catalytic activity in reverse micelles and in homogeneous aqueous medium. Amino Acids 55, 469–479 (2023). https://doi.org/10.1007/s00726-023-03237-w

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  • DOI: https://doi.org/10.1007/s00726-023-03237-w

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