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Updated: Apr 27, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
Published on: October 4, 2019
A conserved germanicol synthase lineage and a single-residue switch controlling triterpene scaffold divergence in
Xue Wang1, Jingyang Ding1, Shiyan Yuan1
1College of Agronomy and Biotechnology, National and Local Joint Engineering Research Center on Germplasm Innovation and Utilization of Chinese Medicinal Materials in Southwest China, Key Laboratory of Medicinal Plant Biology of Yunnan Province, Yunnan Agricultural University, Kunming, Yunnan, China.
Key Message:
A conserved germanicol synthase (GNS) lineage exists in Panax; a single methionine-to-asparagine switch at residue 728 controls triterpene scaffold divergence from β-amyrin to germanicol. Triterpenoid scaffold diversification in Panax is governed by oxidosqualene cyclases (OSCs); however, it remains unclear whether this genus has the ability to produce noncanonical pentacyclic skeletons. In this study, we functionally characterized a previously unrecognized germanicol synthase (PvOSC9) alongside its paralog, β-amyrin synthase (βAS), known as PvOSC8, from Panax vietnamensis var. fuscidiscus. Structural comparisons reveal a single residue 728 (Asn ↔ Met) that alters carbocation folding trajectories, thereby establishing a minimal molecular switch for scaffold identity. Notably, PvOSC9 is enriched in flowers and responds to jasmonate, suggesting a possible context-dependent role of PvOSC9 in floral tissues. Collectively, these findings broaden the triterpene scaffold repertoire in Panax and offer a mechanistically grounded framework for programmable triterpenoid biosynthesis.
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