1
|
Luley-Goedl C, Bruni M, Nidetzky B. Carrier-based immobilization of Aerococcus viridansl-lactate oxidase. J Biotechnol 2024; 382:88-96. [PMID: 38280467 DOI: 10.1016/j.jbiotec.2024.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/22/2023] [Accepted: 01/23/2024] [Indexed: 01/29/2024]
Abstract
l-Lactate oxidase has important applications in biosensing and finds increased use in biocatalysis. The enzyme has been characterized well, yet its immobilization has not been explored in depth. Here, we studied immobilization of Aerococcus viridansl-lactate oxidase on porous carriers of variable matrix material (polymethacrylate, polyurethane, agarose) and surface functional group (amine, Ni2+-loaded nitrilotriacetic acid (NiNTA), epoxide). Carrier activity (Ac) and immobilized enzyme effectiveness (ɳ) were evaluated in dependence of protein loading. Results show that efficient immobilization (Ac: up to 1450 U/g carrier; ɳ: up to 65%) requires a hydrophilic carrier (agarose) equipped with amine groups. The value of ɳ declines sharply as Ac increases, probably due to transition into diffusional regime. Untagged l-lactate oxidase binds to NiNTA carrier similarly as N-terminally His-tagged enzyme. Lixiviation studies reveal quasi-irreversible enzyme adsorption on NiNTA carrier while partial release of activity (≤ 25%) is shown from amine carrier. The desorbed enzyme exhibits the same specific activity as the original l-lactate oxidase. Collectively, our study identifies basic requirements of l-lactate oxidase immobilization on solid carrier and highlights the role of ionic interactions in enzyme-surface adsorption.
Collapse
Affiliation(s)
| | - Margherita Bruni
- acib - Austrian Center of Industrial Biotechnology, Krenngasse 37, A-8010 Graz, Austria
| | - Bernd Nidetzky
- acib - Austrian Center of Industrial Biotechnology, Krenngasse 37, A-8010 Graz, Austria; Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, NAWI Graz, Petersgasse 12, A-8010 Graz, Austria.
| |
Collapse
|
2
|
Demkiv O, Gayda G, Stasyuk N, Moroz A, Serkiz R, Kausaite-Minkstimiene A, Gonchar M, Nisnevitch M. Flavocytochrome b2-Mediated Electroactive Nanoparticles for Developing Amperometric L-Lactate Biosensors. BIOSENSORS 2023; 13:587. [PMID: 37366952 DOI: 10.3390/bios13060587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/17/2023] [Accepted: 05/26/2023] [Indexed: 06/28/2023]
Abstract
L-Lactate is an indicator of food quality, so its monitoring is essential. Enzymes of L-Lactate metabolism are promising tools for this aim. We describe here some highly sensitive biosensors for L-Lactate determination which were developed using flavocytochrome b2 (Fcb2) as a bio-recognition element, and electroactive nanoparticles (NPs) for enzyme immobilization. The enzyme was isolated from cells of the thermotolerant yeast Ogataea polymorpha. The possibility of direct electron transfer from the reduced form of Fcb2 to graphite electrodes has been confirmed, and the amplification of the electrochemical communication between the immobilized Fcb2 and the electrode surface was demonstrated to be achieved using redox nanomediators, both bound and freely diffusing. The fabricated biosensors exhibited high sensitivity (up to 1436 A·M-1·m-2), fast responses, and low limits of detection. One of the most effective biosensors, which contained co-immobilized Fcb2 and the hexacyanoferrate of gold, having a sensitivity of 253 A·M-1·m-2 without freely diffusing redox mediators, was used for L-Lactate analysis in samples of yogurts. A high correlation was observed between the values of analyte content determined using the biosensor and referenced enzymatic-chemical photometric methods. The developed biosensors based on Fcb2-mediated electroactive nanoparticles can be promising for applications in laboratories of food control.
Collapse
Affiliation(s)
- Olha Demkiv
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Galina Gayda
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Nataliya Stasyuk
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Anna Moroz
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Roman Serkiz
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Asta Kausaite-Minkstimiene
- NanoTechnas-Center of Nanotechnology and Materials Science, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Mykhailo Gonchar
- Department of Analytical Biotechnology, Institute of Cell Biology National Academy of Sciences of Ukraine (ICB NASU), 14/16, Dragomanova Str., 79005 Lviv, Ukraine
| | - Marina Nisnevitch
- Department of Chemical Engineering, Ariel University, Kyriat-ha-Mada, Ariel 4070000, Israel
| |
Collapse
|
3
|
Boyarski A, Shlush N, Paz S, Eichler J, Alfonta L. Electrochemical characterization of a dual cytochrome-containing lactate dehydrogenase. Bioelectrochemistry 2023; 152:108406. [PMID: 36931144 DOI: 10.1016/j.bioelechem.2023.108406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 02/16/2023] [Accepted: 02/23/2023] [Indexed: 03/09/2023]
Abstract
Flavin-dependent L-lactate dehydrogenase (LDH) from baker's yeast (Saccharomyces cerevisiae) reversibly catalyzes the oxidation of L-lactate to L-pyruvate. In this study, four different enzymatic constructs were generated, and their catalytic and electrochemical properties were compared. Specifically, a truncated form of the native enzyme that includes only the catalytic domain, the native enzyme that includes an intrinsic electron-transferring cytochrome b2, a novel artificial enzyme containing a minimal cytochrome c and a version of the enzyme containing a fusion between two cytochromes were designed. All four variants were successfully expressed in Escherichia coli and presented properly matured heme domains. Assessing in vitro biocatalytic performance as reflected by lactate oxidation revealed the fusion-containing enzyme to be ∼ 12 times more active than the native enzyme. Electrochemical studies of electrode drop-casted enzyme variants also showed the superior performance of the dual-cytochrome construct, which displayed a lower average redox-potential for lactate oxidation, oxygen insensitivity in the lactate oxidation potential range and a wider dynamic range for lactate sensing, relative to the native enzyme. Moreover, product inhibition of this variant occurred at much higher lactate concentrations than with the native enzyme. In addition, when lower potentials were scanned using cyclic voltammetry, lactate-dependent oxygen reduction was measured for the dual-cytochrome fusion enzyme.
Collapse
Affiliation(s)
- Anastasya Boyarski
- Department of Chemistry, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel
| | - Noam Shlush
- Department of Life Sciences, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel
| | - Shiraz Paz
- Department of Life Sciences, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel
| | - Jerry Eichler
- Department of Life Sciences, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel
| | - Lital Alfonta
- Department of Chemistry, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel; Department of Life Sciences, Ben-Gurion University of the Negev, P.O.Box 653, Beer-Sheva 8410501, Israel.
| |
Collapse
|