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Visible light-driven oxidation of non-native substrate by laccase attached on Ru-based metal-organic frameworks. | LitMetric

Visible light-driven oxidation of non-native substrate by laccase attached on Ru-based metal-organic frameworks.

J Environ Sci (China)

School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215002, China; Key Laboratory of Suzhou Sponge City Technology, Suzhou 215002, China. Electronic address:

Published: March 2024

AI Article Synopsis

  • Light-induced electron transfer can enhance the range of substrates that metalloenzymes can process, but the efficiency is often hindered by poor connections between photosensitizers or photocatalysts and enzymes.
  • Researchers developed a nano-photocatalyst called MIL-125-NH@Ru(bpy) by embedding a ruthenium complex into a metal-organic framework and pairing it with the enzyme multicopper oxidase (MCO) laccase.
  • This new coupling method improved the efficiency of enzymatic oxygen reduction by 35.7% compared to previous methods, due to strong chemical bonds formed between laccase and the photocatalyst, facilitating faster electron transfer.

Article Abstract

Light-induced electron transfer can broaden the substrate range of metalloenzyme. However, the efficiency of photo-enzyme coupling is limited by the poor combination of photosensitizer or photocatalyst with enzyme. Herein, we prepared the nano-photocatalyst MIL-125-NH@Ru(bpy) by in site embedding ruthenium pyridine-diimine complex [Ru(bpy) into metal organic frameworks MIL-125-NH and associated it with multicopper oxidase (MCO) laccase. Compared to [Ru(bpy)], the coupling efficiency of MIL-125-NH@Ru(bpy) for enzymatic oxygen reduction increased by 35.7%. A series of characterizations confirmed that the amino group of laccase formed chemical bonds with the surface defects or hydrophobic groups of MIL-125-NH@Ru(bpy). Consequently, the tight binding accelerated the quenching process and electron transfer between laccase and the immobilized ruthenium pyridine-diimine complex. This work would open an avenue for the synthesis of MOFs photocatalyst towards photo-enzyme coupling.

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Source
http://dx.doi.org/10.1016/j.jes.2023.02.047DOI Listing

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