Genome of Tripterygium wilfordii and identification of cytochrome P450 involved in triptolide biosynthesis
Lichan Tu, Ping Su, Zhongren Zhang, Linhui Gao, Jiadian Wang, Tianyuan Hu, Jiawei Zhou, Yifeng Zhang, Yujun Zhao, Yuan Liu, Yadi Song, Yuru Tong, Yun Lü, Jian Yang, Xu Cao, Meirong Jia, Reuben J. Peters, Luqi Huang, Wei Gao
Abstract
Triptolide is a trace natural product of Tripterygium wilfordii. It has antitumor activities, particularly against pancreatic cancer cells. Identification of genes and elucidation of the biosynthetic pathway leading to triptolide are the prerequisite for heterologous bioproduction. Here, we report a reference-grade genome of T. wilfordii with a contig N50 of 4.36 Mb. We show that copy numbers of triptolide biosynthetic pathway genes are impacted by a recent whole-genome triplication event. We further integrate genomic, transcriptomic, and metabolomic data to map a gene-to-metabolite network. This leads to the identification of a cytochrome P450 (CYP728B70) that can catalyze oxidation of a methyl to the acid moiety of dehydroabietic acid in triptolide biosynthesis. We think the genomic resource and the candidate genes reported here set the foundation to fully reveal triptolide biosynthetic pathway and consequently the heterologous bioproduction.