Plastic bioconversion: Reaction mechanism of PETases

B. K. Ge, G. M. Hu, C. M. Chen*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

The enzyme IsPETase can efficiently degrade polyethylene terephthalate (PET) at room temperature and is an attractive method of plastic bioconversion. Based on mutagenesis experiments on IsPETase, we propose a physical model which predicts that its reaction mechanism can be described by the Michaelis-Menten model with a catalytic efficiency of Ka∙k2, where Ka is the association constant of substrate binding and k2 is the rate constant to form the acyl-enzyme intermediate. This model verifies the assumption of Michaelis-Menten kinetics in previous studies on PETases and has novel applications in deriving the enzyme activity using computational molecular dockings. By computationally docking bis-(2-hydroxyethyl) terephthalic acid (BHET) on the surface of IsPETase mutants, we studied the catalytic effects of various side chains and observed that their predicted activities are consistent with experimental data, with a correlation coefficient in the range of 0.79∼0.88. Based on this study, our model presents an analytical interpretation for the reaction mechanism of PETases and provides an efficient method for computing their catalytic efficiency for identifying enzymes with a better catalytic performance from numerous protein sequences in open databases.

原文英語
頁(從 - 到)331-339
頁數9
期刊Chinese Journal of Physics
73
DOIs
出版狀態已發佈 - 2021 十月

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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