Abstract
Background
Paris polyphylla var. yunnanensis is an important medicinal plant, and the main active ingredient of the plant is polyphyllin, which is a steroid saponin with pharmacological activities. The central enzyme genes participating in the biosynthesis of polyphyllin are increasingly being uncovered; however, UGTs are rarely illustrated.
Methods and results
In this study, we cloned a new sterol glycosyltransferase from Paris polyphylla var. yunnanensis and identified its catalytic function in vitro. PpUGT6 showed the ability to catalyse the C-3 glycosylation of pennogenin sapogenin of polyphyllin, and PpUGT6 showed catalytic promiscuity towards steroids at the C-17 position of testosterone and methyltestosterone and the triterpene at the C-3 position of glycyrrhetinic acid. Homology modelling of the PpUGT6 protein and virtual molecular docking of PpUGT6 with sugar acceptors and donors were performed, and we predicted the key residues interacting with ligands.
Conclusions
Here, PpUGT6, a novel sterol glycosyltransferase related to the biosynthesis of polyphyllin from P. polyphylla, was characterized. PpUGT6 catalysed C-3 glycosylation to pennogenin sapogenin of polyphyllin, which is the first glycosylation step of the biosynthetic pathway of polyphyllins. Interestingly, PpUGT6 demonstrated glycodiversification to testosterone and methyltestosterone at C-17 and triterpene of glycyrrhetinic acid at the C-3 position. The virtual molecular docking of PpUGT6 protein with ligands predicted the key residues interacting with them. This work characterized a novel SGT glycosylating pennogenin sapogenin at C-3 of polyphyllin from P. polyphylla and provided a reference for further elucidation of the phytosterol glycosyltransferases in catalytic promiscuity and key residues interacting with substrates.
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This study was supported by the National Natural Science Foundation of China (No. 81974515)
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This study was funded by No. 81974515.
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He, M., Guo, S., Yin, Y. et al. A novel sterol glycosyltransferase catalyses steroidal sapogenin 3-O glucosylation from Paris polyphylla var. yunnanensis. Mol Biol Rep 50, 2137–2146 (2023). https://doi.org/10.1007/s11033-022-08199-y
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DOI: https://doi.org/10.1007/s11033-022-08199-y