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Related Experiment Video

Updated: Feb 8, 2026

Transient Expression in Nicotiana Benthamiana Leaves for Triterpene Production at a Preparative Scale
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Engineering linear, branched-chain triterpene metabolism in monocots.

Chase Kempinski1,2, Zuodong Jiang1,2, Garrett Zinck2

  • 1Plant Biology Program, University of Kentucky, Lexington, KY, USA.

Plant Biotechnology Journal
|July 7, 2018
PubMed
Summary

Botryococcene biosynthesis was engineered into Brachypodium distachyon, a model monocot. Cytosolic targeting of enzymes yielded high botryococcene titres, while plastid targeting caused detrimental effects, revealing metabolic differences.

Keywords:
BrachypodiumSorghumbotryococcenemetabolic engineeringmonocottriterpene

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Area of Science:

  • Biochemistry
  • Metabolic Engineering
  • Plant Science

Background:

  • Triterpenes, like botryococcene, are synthesized from prenyl precursors via the mevalonate pathway.
  • Botryococcene is a valuable compound for biofuels and petrochemicals.
  • Botryococcus braunii, the natural producer, is challenging for large-scale cultivation.

Purpose of the Study:

  • To genetically engineer the model monocot Brachypodium distachyon for botryococcene biosynthesis.
  • To investigate the impact of subcellular enzyme targeting (cytosolic vs. plastid) on botryococcene production and plant phenotype.

Main Methods:

  • Genetic engineering of Brachypodium distachyon to express botryococcene synthase (BS) and farnesyl diphosphate synthase (FPS).
  • Subcellular targeting strategies were employed to direct enzymes to the cytosol or plastids.
  • Quantification of botryococcene accumulation and assessment of plant phenotypes.

Main Results:

  • High titres of botryococcene (>1 mg/g FW) were achieved in T0 mature plants using cytosolic-targeted enzymes.
  • Plastid-targeted enzymes led to lower botryococcene accumulation.
  • Plastid targeting of FPS resulted in detrimental plant phenotypes, preventing seed set.

Conclusions:

  • Successful engineering of botryococcene biosynthesis in Brachypodium distachyon.
  • Cytosolic targeting is an effective strategy for high-yield botryococcene production in monocots.
  • Significant differences in isoprenoid metabolism exist between monocots and dicots, impacting engineered pathways.