An Ambidextrous Polyphenol Glycosyltransferase PaGT2 from Phytolacca americana

Rakesh Maharjan, Yohta Fukuda, Naomichi Shimomura, Taisuke Nakayama, Yuta Okimoto, Koki Kawakami, Toru Nakayama, Hiroki Hamada, Tsuyoshi Inoue, Shin Ichi Ozaki

Research output: Contribution to journalArticle

Abstract

The glycosylation of small hydrophobic compounds is catalyzed by uridine diphosphate glycosyltransferases (UGTs). Because glycosylation is an invaluable tool for improving the stability and water solubility of hydrophobic compounds, UGTs have attracted attention for their application in the food, cosmetics, and pharmaceutical industries. However, the ability of UGTs to accept and glycosylate a wide range of substrates is not clearly understood due to the existence of a large number of UGTs. PaGT2, a UGT from Phytolacca americana, can regioselectively glycosylate piceatannol but has low activity toward other stilbenoids. To elucidate the substrate specificity and catalytic mechanism, we determined the crystal structures of PaGT2 with and without substrates and performed molecular docking studies. The structures have revealed key residues involved in substrate recognition and suggest the presence of a nonconserved catalytic residue (His81) in addition to the highly conserved catalytic histidine in UGTs (His18). The role of the identified residues in substrate recognition and catalysis is elucidated with the mutational assay. Additionally, the structure-guided mutation of Cys142 to other residues, Ala, Phe, and Gln, allows PaGT2 to glycosylate resveratrol with high regioselectivity, which is negligibly glycosylated by the wild-type enzyme. These results provide a basis for tailoring an efficient glycosyltransferase.

Original languageEnglish
Pages (from-to)2551-2561
Number of pages11
JournalBiochemistry
Volume59
Issue number27
DOIs
Publication statusPublished - 2020 Jul 14

ASJC Scopus subject areas

  • Biochemistry

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    Maharjan, R., Fukuda, Y., Shimomura, N., Nakayama, T., Okimoto, Y., Kawakami, K., Nakayama, T., Hamada, H., Inoue, T., & Ozaki, S. I. (2020). An Ambidextrous Polyphenol Glycosyltransferase PaGT2 from Phytolacca americana. Biochemistry, 59(27), 2551-2561. https://doi.org/10.1021/acs.biochem.0c00224