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Morales AH, Hero JS, Ledesma AE, Perez HA, Navarro MC, Gómez MI, Romero CM. Interfacial Hyperactivation of Candida rugosa Lipase onto Ca 2Fe 2O 5 Nanoparticles: pH and Ionic Strength Fine-Tuning to Modulate Protein-Support Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:12004-12019. [PMID: 37585874 DOI: 10.1021/acs.langmuir.3c01040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
The current study provides a comprehensive look of the adsorption process of Candida rugosa lipase (CRL) on Ca2Fe2O5 iron oxide nanoparticles (NPs). Protein-support interactions were identified across a broad range of pH and ionic strengths (mM) through a response surface methodology, surface charge determination, and spectroscopic and in silico analyses. The maximum quantity of immobilized protein was achieved at an ionic strength of 50 mM and pH 4. However, this condition did not allow for the greatest hydrolytic activity to be obtained. Indeed, it was recorded at acidic pH, but at 150 mM, where evaluation of the recovered activity revealed hyperactivation of the enzyme. These findings were supported by adsorption isotherms performed under different conditions. Based on zeta potential measurements, electrostatic interactions contributed differently to protein-support binding under the conditions tested, showing a strong correlation with experimentally determined immobilization parameters. Raman spectra revealed an increase in hydrophobicity around tryptophan residues, whereas the enzyme immobilization significantly reduced the phenylalanine signal in CRL. This suggests that this residue was involved in the interaction with Ca2Fe2O2 and molecular docking analysis confirmed these findings. Fluorescence spectroscopy showed distinct behaviors in the CRL emission patterns with the addition of Ca2Fe2O5 at pH 4 and 7. The calculated thermodynamic parameters indicated that the contact would be mediated by hydrophobic interactions at both pHs, as well as by ionic ones at pH 4. In this approach, this work adds to our understanding of the design of biocatalysts immobilized in iron oxide NPs.
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Affiliation(s)
- Andrés H Morales
- Planta Piloto de Procesos Industriales Microbiológicos PROIMI-CONICET, Av. Belgrano y Pasaje Caseros, Tucumán T4001 MVB, Argentina
| | - Johan S Hero
- Planta Piloto de Procesos Industriales Microbiológicos PROIMI-CONICET, Av. Belgrano y Pasaje Caseros, Tucumán T4001 MVB, Argentina
| | - Ana E Ledesma
- Centro de Investigación en Biofísica Aplicada y Alimentos (CIBAAL-UNSE-CONICET), Departamento Académico de Química, Facultad de Ciuencias Exactas y Tecnológicas, Universidad Nacional de Santiago del Estero, Av. Belgrano Sur 1912, Santiago del Estero 4200, Argentina
| | - Hugo A Perez
- Centro de Investigación en Biofísica Aplicada y Alimentos (CIBAAL-UNSE-CONICET), Departamento Académico de Química, Facultad de Ciuencias Exactas y Tecnológicas, Universidad Nacional de Santiago del Estero, Av. Belgrano Sur 1912, Santiago del Estero 4200, Argentina
| | - María C Navarro
- Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, San Miguel de Tucumán T4000IL, Argentina
| | - María I Gómez
- Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, San Miguel de Tucumán T4000IL, Argentina
| | - Cintia M Romero
- Planta Piloto de Procesos Industriales Microbiológicos PROIMI-CONICET, Av. Belgrano y Pasaje Caseros, Tucumán T4001 MVB, Argentina
- Facultad de Bioquímica, Química y Farmacia, UNT. Chacabuco 461, San Miguel de Tucumán T4000IL, Argentina
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Costa-Silva T, Carvalho A, Souza C, Freitas L, De Castro H, Oliveira W. Highly effective Candida rugosa lipase immobilization on renewable carriers: integrated drying and immobilization process to improve enzyme performance. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.04.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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