Volume 61, Issue 1 e202111054
Research Article
Free to Read

Installing a Green Engine To Drive an Enzyme Cascade: A Light-Powered In Vitro Biosystem for Poly(3-hydroxybutyrate) Synthesis

Fei Li

Fei Li

Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

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Xinlei Wei

Xinlei Wei

Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

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Lin Zhang

Lin Zhang

Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing, 100093 P. R. China

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Cheng Liu

Cheng Liu

Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing, 100093 P. R. China

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Prof. Dr. Chun You

Prof. Dr. Chun You

Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049 P. R. China

National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

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Prof. Dr. Zhiguang Zhu

Corresponding Author

Prof. Dr. Zhiguang Zhu

Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049 P. R. China

National Technology Innovation Center of Synthetic Biology, 32 West 7th Avenue, Tianjin Airport Economic Area, Tianjin, 300308 P. R. China

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First published: 18 October 2021
Citations: 33

Graphical Abstract

Thylakoid membranes were introduced into an in vitro biosystem for the synthesis of polyhydroxybutyrate to enable the conversion of light energy into biological energy through the regeneration of NADPH and ATP (see picture). The use of thylakoid membranes as a green engine in this way is a promising strategy for light-powered cell-free biomanufacturing.

Abstract

Many existing in vitro biosystems harness power from the chemical energy contained in substrates and co-substrates, and light or electric energy provided from abiotic parts, leading to a compromise in atom economy, incompatibility between biological and abiotic parts, and most importantly, incapability to spatiotemporally co-regenerate ATP and NADPH. In this study, we developed a light-powered in vitro biosystem for poly(3-hydroxybutyrate) (PHB) synthesis using natural thylakoid membranes (TMs) to regenerate ATP and NADPH for a five-enzyme cascade. Through effective coupling of cofactor regeneration and mass conversion, 20 mM PHB was yielded from 50 mM sodium acetate with a molar conversion efficiency of carbon of 80.0 % and a light-energy conversion efficiency of 3.04 %, which are much higher than the efficiencies of similar in vitro PHB synthesis biosystems. This suggests the promise of installing TMs as a green engine to drive more enzyme cascades.

Conflict of interest

The authors declare no conflict of interest.

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