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Biosynthesis of Lipids

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Connecting moss lipid droplets to patchoulol biosynthesis.

Anantha Peramuna1, Hansol Bae1,2, Carmen Quiñonero López1

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Researchers engineered the moss Physcomitrium patens to produce the valuable sesquiterpene patchoulol by targeting it to lipid droplets (LDs). Linking patchoulol synthase to Seipin enhanced patchoulol retention and production in these engineered cells.

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Area of Science:

  • Biotechnology
  • Plant Science
  • Metabolic Engineering

Background:

  • Terpenoids are vital compounds used across industries, but their production in heterologous hosts is challenging.
  • Heterologous systems often struggle with low terpene accumulation and loss due to evaporation.

Purpose of the Study:

  • To enhance sesquiterpene production in the heterologous host Physcomitrium patens.
  • To investigate targeting patchoulol to cytoplasmic lipid droplets (LDs) for improved yield and retention.

Main Methods:

  • Engineered Physcomitrium patens by fusing patchoulol synthase (PTS) to LD-associated proteins (Oleosin, LDAP1, Seipin).
  • Assessed the impact of PTS-protein fusion on LD biogenesis, patchoulol accumulation, and retention.
  • Quantified PTS expression and patchoulol production in anchored mutants compared to controls.

Main Results:

  • Ectopic expression of PTS influenced LD number and size, suggesting a link with LD biogenesis.
  • Linking PTS to Seipin significantly increased LD size and patchoulol retention within the cell.
  • Seipin-linked mutants showed higher patchoulol production per unit of PTS expression.

Conclusions:

  • Targeting terpene production to LDs is a viable strategy for enhancing accumulation in heterologous hosts.
  • Seipin serves as an effective anchor for improving patchoulol production and cellular retention in Physcomitrium patens.
  • This approach offers a promising avenue for the biotechnological production of valuable plant-derived terpenoids.