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Benítez-Mateos AI, Huber C, Nidetzky B, Bolivar JM, López-Gallego F. Design of the Enzyme-Carrier Interface to Overcome the O 2 and NADH Mass Transfer Limitations of an Immobilized Flavin Oxidase. ACS Appl Mater Interfaces 2020; 12:56027-56038. [PMID: 33275418 DOI: 10.1021/acsami.0c17568] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding how the immobilization of enzymes on solid carriers affects their performance is paramount for the design of highly efficient heterogeneous biocatalysts. An efficient supply of substrates onto the solid phase is one of the main challenges to maximize the activity of the immobilized enzymes. Herein, we apply advanced single-particle analysis to decipher the optimal design of an immobilized NADH oxidase (NOX) whose activity depends both on O2 and NADH concentrations. Carrier physicochemical properties and its functionality along with the enzyme distribution across the carrier were implemented as design variables to study the effects of the intraparticle concentration of substrates (O2 and NADH) on the activity. Intraparticle O2-sensing analysis revealed the superior performance of the enzyme immobilized at the outer surface in terms of effective supply of O2. Furthermore, the co-immobilization of NADH and NOX within the tuned surface of porous microbeads increases the effective concentration of NADH in the surroundings of the enzyme. As a result, the optimal spatial organization of NOX and its confinement with NADH allow a 100% recovery of the activity of the soluble enzyme upon the immobilization process. By engineering these variables, we increase the NADH oxidation activity of the heterogeneous biocatalyst by up to 650% compared to NOX immobilized under suboptimal conditions. In conclusion, this work highlights the rational design and engineering of the enzyme-carrier interface to maximize the efficiency of heterogeneous biocatalysts.
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Affiliation(s)
- Ana I Benítez-Mateos
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, Donostia San Sebastián 20014, Spain
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, Zaragoza 50009, Spain
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse3, Bern 3012, Switzerland
| | - Christina Huber
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, Graz A-8010, Austria
| | - Bernd Nidetzky
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, Graz A-8010, Austria
- Austrian Centre of Industrial Biotechnology, Krenngasse 37, Graz A-8010, Austria
| | - Juan M Bolivar
- Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, Graz A-8010, Austria
- Department of Chemical and Materials Engineering, Complutense University of Madrid, 28040, Madrid, Spain
| | - Fernando López-Gallego
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, Donostia San Sebastián 20014, Spain
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, Zaragoza 50009, Spain
- Ikerbasque, Basque Foundation for Science, Maria Diaz de Haro 3, Bilbao 48013, Spain
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