Stability-Controllable Self-Immobilization of Carbonic Anhydrase Fused with a Silica-Binding Tag onto Diatom Biosilica for Enzymatic CO2 Capture and Utilization
- Authors
- Kim, Suhyeok; Joo, Kye Il; Jo, Byung Hoon; Cha, Hyung Joon
- Issue Date
- 17-Jun-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- carbonic anhydrase; silica-binding tag; biosilica; Hydrogenovibrio marinus; enzyme immobilization; mactomolecular crowding
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.24, pp 27055 - 27063
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 24
- Start Page
- 27055
- End Page
- 27063
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/6486
- DOI
- 10.1021/acsami.0c03804
- ISSN
- 1944-8244
1944-8252
- Abstract
- Exploiting carbonic anhydrase (CA), an enzyme that catalyzes the hydration of CO2, is a powerful route for ecofriendly and cost-effective carbon capture and utilization. For successful industrial applications, the stability and reusability of CA should be improved, which necessitates enzyme immobilization. Herein, the ribosomal protein L2 (Si-tag) from Escherichia coli was utilized for the immobilization of CA onto diatom biosilica, a promising renewable support material. The Si-tag was redesigned (L2NC) and genetically fused to CA from the marine bacterium Hydrogenovibrio marinus (hmCA). One-step self-immobilization of hmCA-L2NC onto diatom biosilica by simple mixing was successfully achieved via Si-tag-mediated strong binding, showing multilayer adsorption with a maximal loading of 1.4 wt %. The immobilized enzyme showed high reusability and no enzyme leakage even under high temperature conditions. The activity of hmCA-L2NC was inversely proportional to the enzyme loading, while the stability was directly proportional to the enzyme loading. This discovered activity-stability trade-off phenomenon could be attributed to macromolecular crowding on the highly dense surface of the enzyme-immobilized biosilica. Collectively, our system not only facilitates the stability-controllable self-immobilization of enzyme via Si-tag on a diatom biosilica support for the robust, facile, and green construction of stable biocatalysts, but is also a unique model for studying the macromolecular crowding effect on surface-immobilized enzymes.
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