Abstract
In the present work, we performed Density Functional Theory calculations to explore the bioactivation mechanism of thiophene-containing molecules mediated by P450s. For this purpose, relatively large size compounds, 2,5-diaminothiophene derivatives were selected particularly for this investigation. Here we found the successive regio-selectivity triggered by conformational turn played a significant role in the occurrence of bioactivation. 2,5-Diaminothiophene was oxidized to a 2,5-diimine thiophene-reactive intermediate by Compound I (Cpd I) through successive activations of two N–H bonds (H3–N11 and H1–N6). This reaction exhibited three special characteristics: (1) self-controlled regio-selectivity during the oxidation process. There was a large scale of conformational turn in the abstraction of the first H atom which triggers the selection of the second H for abstraction. (2) Proton-shuttle mechanism. In high spin (HS) state, proton-shuttle mechanism was observed for the abstraction of the second H atom. (3) Spin-selective manner. In protein environment, the energy barrier in HS state was much lower than that in low spin state. The novel proposed bioactivation mechanism of 2,5-diaminothiophene compounds can help us in rational design of thiophene-contained drugs avoiding the occurrence of bioactivation.
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Acknowledgements
This work was supported by the China Postdoctoral Science Foundation (Grant no. 2017M622784), the National Natural Science Foundation of China (Grant no. 81173124), Shenzhen Science and Technology Innovation Commission (Grant nos. JCYJ20160308104109234 and KQJSCX20170728150303243), and the National Key Research and Development Program of China (Grant no. 2017YFC1702006).
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Ai, CZ., Liu, Y., Chen, DC. et al. Conformational turn triggers regio-selectivity in the bioactivation of thiophene-contained compounds mediated by cytochrome P450. J Biol Inorg Chem 24, 1023–1033 (2019). https://doi.org/10.1007/s00775-019-01699-6
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DOI: https://doi.org/10.1007/s00775-019-01699-6