Open AccessSilk Nanococoons: Bio‐Nanoreactors for Enzymatic Catalytic Reactions and Applications to Alcohol Intoxication
Author(s) -
Chen Zhengwei,
Hu Fan,
Lin Zaifu,
Hu Jin,
Shen Runqing,
Lin Youhui,
Liu Xiang Yang
Publication year - 2021
Publication title -
small science
Language(s) - English
Resource type - Journals
ISSN - 2688-4046
DOI - 10.1002/smsc.202000049
Subject(s) - fibroin , silk , glucose oxidase , enzyme , chemistry , catalase , nanoreactor , horseradish peroxidase , catalysis , biochemistry , materials science , composite material
Enzymatic reactions are often terminated by severe aqueous environments. Inspired by bio‐protection of silk cocoons, a system of silk fibroin (SF) nanococoons is developed, which is capable of providing a bio‐protective environment for enzymatic activities on one hand, and facilitating the process of cascade enzymatic reactions on the other hand. This gives rise to the significant enhancement in enzymatic stability and efficacy. For instance, the protected glucose oxidase and horseradish peroxidase enzymes exhibit a 17.5‐ and 7.0‐fold increase when stored at 60 °C (>50% activity; ≈28 h) and 25 °C (>67.5% activity; ≈14 days), respectively, compared with free enzymes. It follows that this protective effect is subject to the mutual templated crystallization between enzymes and SF molecules, which prevents enzyme molecules from unfolding. In animal experiments, it shows that alcohol oxidase and catalase protected by silk nanococoons are able to reduce the alcohol levels of intoxicated mice with >5.0‐time efficacy at the alcohol decomposition level of >80% in 4.0 h compared with the unprotected. By bio‐inspiration of silk cocoons, the silk bio‐nanoreactors demonstrate the significant potential applications in biomedicine.