Biosynthetic Pathways of Indole Diterpenoids

Summary

Indole diterpenoids are a diverse class of fungal secondary metabolites characterised by a diterpene skeleton fused to an indole moiety. Biosynthesis initiates with the condensation of geranylgeranyl diphosphate (GGPP) and indole-3-glycerol phosphate (IGP) to form 3-geranylgeranylindole, which undergoes a series of cyclisations, oxidations and prenylations. These transformations are orchestrated by clustered genes encoding prenyltransferases, cytochrome P450 monooxygenases and other tailoring enzymes. The modular nature of these pathways permits extensive structural diversification, yielding architectures such as paxilline, lolitrem and aflatrem families. Detailed genetic and enzymatic studies have clarified late-stage steps, revealing how specific P450s mediate hydroxylation and ring rearrangements. The structural variety of indole diterpenoids underpins a broad spectrum of bioactivities, including ion channel modulation, antimicrobial, anticancer and neuroprotective effects. Insight into these pathways has enabled heterologous expression, pathway engineering and synthetic biology approaches, pointing to applications in drug discovery and agricultural biotechnology.

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Biosynthetic Pathways of Indole Diterpenoids publication trend

The graph below shows the total number of articles in biosynthetic pathways of indole diterpenoids across all publications each year (not limited to Nature Index journals).

Technical terms

Geranylgeranyl diphosphate (GGPP): C20 isoprenoid precursor for diterpene synthesis.

Indole-3-glycerol phosphate (IGP): Biosynthetic intermediate providing the indole moiety in indole diterpenoids.

Prenylation: Enzymatic attachment of isoprene units to core molecules, diversifying chemical structures.

Cytochrome P450 monooxygenase: Heme-dependent enzyme catalysing regio- and stereospecific oxidation steps.

Dimeric indole diterpenoid: Compound formed by covalent linkage of two indole diterpene monomers, often with distinct bioactivities.

References

  1. Indole Diterpenes from Mangrove Sediment-Derived Fungus Penicillium sp. UJNMF0740 Protect PC12 Cells against 6-OHDA-Induced Neurotoxicity via Regulating the PI3K/Akt Pathway. Marine Drugs (2023).
  2. The first dimeric indole-diterpenoids from a marine-derived Penicillium sp. fungus and their potential for anti-obesity drugs. Marine Life Science & Technology (2024).
  3. The chemical structures and biological activities of indole diterpenoids. Natural Products and Bioprospecting (2023).

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