Specificity of Ocimum basilicum geraniol synthase modified by its expression in different heterologous systems

► A monoterpenol synthase can differ in its enzymatic specificity when expressed in heterologous conditions. ► Differences in enzymatic specificity partly arise from the enzyme itself and partly from its cellular environment. ► Yeast (Saccharomyces cerevisiae) and plant (Nicotiana benthamiana) are easy to use and reliable heterologous models.