数字农科院2.0

Functional diversity of oxidosqualene cyclases in genus Oryza

文献类型： 外文期刊

作者： Ma, Aimin;Sun, Juncong;Feng, Laibao;Xue, Zheyong;Wu, Wenbin;Song, Bo;Xiong, Xingchen;Wang, Xiaoning;Han, Bin;Osbourn, Anne;Qi, Xiaoquan

作者机构：

关键词： friedelin;grain size;Oryza;oxidosqualene cyclases;triterpene

期刊名称： NEW PHYTOLOGIST

ISSN： 0028-646X

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Triterpene skeletons, catalyzing by 2,3-oxidosqualene cyclases (OSCs), are essential for synthesis of steroids and triterpenoids. In japonica rice cultivars Zhonghua11, a total of 12 OsOSCs have been found. While the catalytic functions of OsOSC1, 3, 4, 9, and 10 remain unclear, the functions of the other OsOSCs have been well studied. In this study, we conducted a comprehensive analysis of 12 OSC genes within genus Oryza with the aid of 63 genomes from cultivated and wild rice. We found that OSC genes are relatively conserved within genus Oryza with a few exceptions. Collinearity analysis further suggested that, throughout the evolutionary history of genus Oryza, the OSC genes have not undergone significant rearrangements or losses. Further functional analysis of 5 uncharacterized OSCs revealed that OsOSC10 was a friedelin synthase, which affected the development of rice grains. Additionally, the reconstructed ancestral sequences of Oryza OSC3 and Oryza OSC9 had lupeol synthase and poaceatapetol synthase activity, respectively. The discovery of friedelin synthase in rice unlocks a new catalytic path and biological function of OsOSC10. The pan-genome analysis of OSCs within genus Oryza gives insights into the evolutionary trajectory and products diversity of Oryza OSCs.

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