Cytochrome P450-catalyzed biosynthesis of furanoditerpenoids in the bioenergy crop switchgrass (Panicum virgatum L.)

Andrew Muchlinski, Meirong Jia, Kira Tiedge, Jason S. Fell, Kyle A. Pelot, Lisl Chew, Danielle Davisson, Yuxuan Chen, Justin Siegel, John T. Lovell, Philipp Zerbe

Research output: Contribution to journalArticlepeer-review

Abstract

Specialized diterpenoid metabolites are important mediators of plant–environment interactions in monocot crops. To understand metabolite functions in plant environmental adaptation that ultimately can enable crop improvement strategies, a deeper knowledge of the underlying species-specific biosynthetic pathways is required. Here, we report the genomics-enabled discovery of five cytochrome P450 monooxygenases (CYP71Z25–CYP71Z29) that form previously unknown furanoditerpenoids in the monocot bioenergy crop Panicum virgatum (switchgrass). Combinatorial pathway reconstruction showed that CYP71Z25–CYP71Z29 catalyze furan ring addition directly to primary diterpene alcohol intermediates derived from distinct class II diterpene synthase products. Transcriptional co-expression patterns and the presence of select diterpenoids in switchgrass roots support the occurrence of P450-derived furanoditerpenoids in planta. Integrating molecular dynamics, structural analysis and targeted mutagenesis identified active site determinants that contribute to the distinct catalytic specificities underlying the broad substrate promiscuity of CYP71Z25–CYP71Z29 for native and non-native diterpenoids.

Original languageEnglish (US)
JournalPlant Journal
DOIs
StateAccepted/In press - 2021

Keywords

  • cytochrome P450 monooxygenase
  • diterpenoid biosynthesis
  • Panicum virgatum
  • plant natural products
  • plant specialized metabolism

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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