Organic Letters 2009-Jun
Product profile of PEN3: the last unexamined oxidosqualene cyclase in Arabidopsis thaliana.
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The triterpene product profile is reported for At5g36150 (PEN3), the last unexamined oxidosqualene cyclase in the reference plant Arabidopsis thaliana. PEN3 makes tirucalla-7,24-dien-3beta-ol ( approximately 85%) and several minor products. Also discussed are the unexpectedly facile convergent evolution of another Arabidopsis tirucalladienol synthase (LUP5), mechanistic origins of the 20S configuration, and active-site remodeling necessary to accommodate the 17alpha side chain. This work marks the first completed functional characterization of all triterpene synthases in a higher plant.
