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Rational Design of a Miniature Photocatalytic CO2-Reducing Enzyme, ACS Catal, 23 Apr 2021

发布时间:2021年04月23日

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ACS Catalysis, 23 April, 2021, DOI:澳门申慱太阳城

Rational Design of a Miniature Photocatalytic CO2-Reducing Enzyme

Fuying Kang, Lu Yu, Yan Xia, Minling Yu, Lin Xia, Yuchuan Wang, Lin Yang, Tianyuan Wang, Weimin Gong, Changlin Tian*, Xiaohong Liu*, and Jiangyun Wang*

Abstract

Photosystem I (PSI) is a very large membrane protein complex (~1000 kDa) harboring P700*, the strongest reductant known in biological systems, which is responsible for driving NAD(P)+ and ultimately for CO2 reduction. Although PSI is one of the most important components in the photosynthesis machinery, it has remained difficult to enhance PSI functions through genetic engineering due to its enormous complexity. Inspired by PSI’s ability to undergo multiple-step photo-induced electron hopping from P700* to iron–sulfur [Fe4S4] clusters, we designed a 33 kDa miniature photocatalytic CO2-reducing enzyme (mPCE) harboring a chromophore (BpC) and two [Fe4S4] clusters (FeA/FeB). Through reduction potential fine-tuning, we optimized the multiple-step electron hopping from BpC to FeA/FeB, culminating in a CO2/HCOOH conversion quantum efficiency of 1.43%. As mPCE can be overexpressed with a high yield in Escherichia coli cells without requiring synthetic cofactors, further development along this route may result in rapid photo-enzyme quantum yield improvement and functional expansion through an efficient directed evolution process.

文章链接:http://www.57p.257tyc.com/doi/full/10.1021/acscatal.1c00287

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