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Background  Three species of wintersweets:  Chimonanthus salicifolius  S. Y. Hu,  Chimonanthus zhejiangensis  M. C. Liu and  Chimonanthus grammalus  M. C. Liu are widely distributed in China. The three wintersweets belonging to the genus of  Chimonanthus  that can synthesize abundant terpenoids that are beneficial to human health. Their buds and leaves are traditional Chinese herb applied by the ‘She’ ethnic minority in southeast of China. Squalene is a multi-functional and ubiquitous triterpene in plants, which is biosynthesized by squalene synthase (SQS) using farnesyl diphosphate (FPP) as the substrate. The synthesis of squalene in wintersweet was not clearly. This work would provide us much help to further understand the terpene metabolism in wintersweet and its health function to people at phytochemistry and molecular levels.    Results  In this study, we identified squalene component in the extractions of leaves of three wintersweets and isolated SQS genes from leaf transcriptomes. The three SQSs were highly conservative, so CzSQS from  C. zhejiangensis  was just determined the enzymatic activity. The in vitro expressed CzSQS that deleted two transmembrane domains could catalyze FPP to generate squalene with the presence of NADPH and Mg 2+ .    Conclusions  The squalene was one of wintersweet leaves phytochemicals. The squalene synthases of three wintersweet plants were highly conserved. The CzSQS was capable to catalyze two FPP molecules to squalene.    Electronic supplementary material  The online version of this article (10.1186/s40529-018-0246-6) contains supplementary material, which is available to authorized users.

Squalene synthase cloning and functional identification in wintersweet plant (Chimonanthus zhejiangensis)