Conversion mechanism of enoyl thioesters into acyl thioesters catalyzed by 2-enoyl-thioester reductases from Candida Tropicalis

Literature Information

Publication Date 2019-04-25
DOI 10.1039/C9CP00987F
Impact Factor 3.676
Authors

Hong Li, Lijuan Yan, Rutao Liu, Yongjun Liu


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Abstract

Enoyl thioester reductase from Candida tropicalis (Etr1p) catalyzes the NADPH-dependent conversion of enoyl thioesters into acyl thioesters, which are essential in fatty acid and second metabolite biosynthesis. In this paper, we explored the detailed catalytic mechanism of Etr1p by performing QM/MM calculations. Here, we focused on the formation of the covalent ene adduct intermediate and the proton transfer from Tyr79 to the substrate. Our calculation results reveal that the formation of the stable covalent ene adduct follows the Michael addition mechanism rather than the electrocyclic ene reaction. In addition, the ene adduct intermediate can reversibly decompose into the carbanion, and the proton of Tyr79 undertakes a direct electrophilic attack on the substrate to yield the product. In addition, three crystal water molecules do not participate in the catalytic reaction, but they play a crucial role in the hydride transfer and the proton transfer processes by forming a hydrogen bond network. These findings presented here would benefit our understanding of the catalytic mechanism of the NADPH-dependent enzyme.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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