Download MendeleyRationally designing P450BM3-H to excavate a novel channel for product exit and enhance overall performance.
Deng, Q., Lu, Z.M., Yuan, Z., Feng, Y., Zhang, L., Shi, J., Xu, Z., Kofas, M.A.G., Li, H.(2025) Int J Biol Macromol 307: 142162-142162
- PubMed: 40107536
- DOI: https://doi.org/10.1016/j.ijbiomac.2025.142162
- Primary Citation of Related Structures:
9KGP - PubMed Abstract:
P450 dihydroxylase plays a crucial role in steroid drug synthesis by efficiently catalyzing two-step selective hydroxylation reactions. However, natural P450 dihydroxylases are scarce, with poor catalytic performance and intermediate accumulation limiting production. Here, we report a P450 dihydroxylase BM3-H that synthesizes 7α,15α-diOH-DHEA with 76 % selectivity. To enhance 7α,15α-diOH-DHEA synthesis, we engineered a novel exit channel for the intermediate by modifying key residues in the solvent channel. The triple mutant D182K/E143D/V178A exhibited significant improvements in product concentration (10.08-fold), enzymatic activity (2.16-fold), catalytic efficiency (k cat /K m , 42.32-fold), electron transfer rate (k ET , 27.14-fold), and coupling efficiency (CE, 3.93-fold). Molecular dynamics simulations revealed that D182K/E143D/V178A created a novel exit channel for 7α-OH-DHEA, with channel length, polarity, and steric hindrance influencing enzyme performance. Our approach enhances the overall catalytic performance of P450BM3-H by excavating new intermediate product exit channels, providing theoretical guidance for the design of other enzyme molecules.
- School of Biotechnology, Jiangnan University, Wuxi, People's Republic of China. Electronic address: 7210201002@stu.jiangnan.edu.cn.
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