<▼1><P>The flavonoid extract from <I>Erigeron breviscapus</I>, breviscapine, has increasingly been used to treat cardio- and cerebrovascular diseases in China for more than 30 years, and plant supply of <I>E. breviscapus</I> is becoming insufficient to satisfy the growing market demand. Here we report an alternative strategy for the supply of breviscapine by building a yeast cell factory using synthetic biology. We identify two key enzymes in the biosynthetic pathway (flavonoid-7-<I>O</I>-glucuronosyltransferase and flavone-6-hydroxylase) from <I>E. breviscapus</I> genome and engineer yeast to produce breviscapine from glucose. After metabolic engineering and optimization of fed-batch fermentation, scutellarin and apigenin-7-<I>O</I>-glucuronide, two major active ingredients of breviscapine, reach to 108 and 185 mg l<SUP>–1</SUP>, respectively. Our study not only introduces an alternative source of these valuable compounds, but also provides an example of integrating genomics and synthetic biology knowledge for metabolic engineering of natural compounds.</P></▼1><▼2><P>Breviscapine is the flavonoid extract from medical plant <I>Erigeron breviscapus</I> for the treatment of cardio- and cerebrovascular disease. Here, the authors identify the key enzymes of the biosynthetic pathway from the plant genome and engineer yeast to produce breviscapine from glucose.</P></▼2>