Chinese Journal of Catalysis ›› 2024, Vol. 60: 386-398.DOI: 10.1016/S1872-2067(24)60020-3

• Articles • Previous Articles    

Multivariate mesoporous MOFs with regulatable hydrophilic/hydrophobic surfaces as a versatile platform for enzyme immobilization

Yuxiao Fenga, Qingqing Maa, Zichen Wanga, Qunli Zhanga, Lixue Zhaoa, Jiandong Cuia,d,*(), Yingjie Dua,b,c,*(), Shiru Jiaa   

  1. aState Key Laboratory of Food Nutrition and Safety, Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
    bState Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, Hubei, China
    cTianjin UBasio Biotechnology Group, Tianjin 300457, China
    dKey Laboratory of Biomass Chemical Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2024-01-17 Accepted:2024-03-17 Online:2024-05-18 Published:2024-05-20
  • Contact: E-mail: jdcui@tust.edu.cn (J. Cui), yingjiedu@tust.edu.cn (Y. Du).
  • About author:First author contact:1Contributed to this work equally.
  • Supported by:
    National Natural Science Foundation of China(22108206);Fundamental Research Funds for the Central Universities(226-2023-0085);project of Guangxi Key Research and Development program, China(GuikeAB21238005);China Postdoctoral Science Foundation Project(2023T160483);China Postdoctoral Science Foundation Project(2022M722387);Open Funding Project of the State Key Laboratory of Biocatalysis and Enzyme Engineering(SKLBEE2022004)

Abstract:

Zeolitic imidazole frameworks materials-8 (ZIF-8), a member of the metal-organic framework (MOFs) series, have been extensively used as a host matrix for enzyme immobilization. However, the microporous structure and hydrophobicity, as well as the protonation of the precursor 2-methylimidazole (2-MeIm) of ZIF-8, remain considerable challenges in maintaining the activity of immobilized enzymes. Here, novel multivariate mesoporous MOFs (mMOFs) with regulatable hydrophilic/hydrophobic surfaces were designed by the multivariate competitive strategy and pore modification engineering. 3-Methyl-1H-1,2,4-triazole (3-MTZ) and 5-methyltetrazole (5-MTA) were employed to partially replace 2-MeIm. These were then combined with zinc sulfate heptahydrate (soft templates) to yield mMOFs in a methanol solution. As a proof-of-concept application, we used mMOFs as carriers for enzyme immobilization and investigated the properties of the immobilized enzymes. Benefiting from their mesoporous structure, hydrophilic surface, and improved microenvironment, multivariate mMOFs exhibit a strong ability to stabilize enzyme conformation and increase enzyme activity compared with traditional ZIF-8. Our study offers an avenue for the controllable preparation of well-designed MOF structures, which will further broaden the application opportunities of MOF materials for enzyme immobilization.

Key words: Mesoporous metal-organic frameworks, Competitive ligand, Soft template, Immobilized enzyme