Polyamines Play Crucial Role in Plant-Fungi Interaction, Epigenetic Modification, and Biosynthesis of Secondary Metabolites

Strategic Insights -

Research conducted by scientists at the Universidad de Leon in Leon, Spain, has shed light on the significant role polyamines play in plant-fungi interaction, epigenetic modification, and biosynthesis of secondary metabolites. Polyamines, a type of polycationic compound present in all living cells, bind to DNA and RNA, modulating DNA replication and gene expression. They also promote condensation of nucleosomes, a mechanism closely connected with epigenetic modification by histone methylation and acetylation.

Key Takeaways:

  • Polyamines, such as 1,3-diaminopropane and spermidine, induce expression of the global regulator LaeA, which controls the switch from primary growth to secondary metabolite production and differentiation when an essential nutrient in the growth medium becomes limiting.
  • a-NAC, a subunit of the nascent polypeptide-associated complex, exerts significant control over the biosynthesis of secondary metabolites and fungal pathogenicity on plants.
  • Spermidine extends the life of yeast cells and prolongs the half-life of penicillin gene transcripts in *Penicillium chrysogenum*.
  • The polyamine induction of secondary metabolite biosynthetic genes in fungi is mediated by global regulator LaeA and a-NAC transcriptional coactivator, connecting it to epigenetic modification of histones.
  • Polyamines modulate DNA replication and gene expression, promoting condensation of nucleosomes, a mechanism closely connected with epigenetic modification by histone methylation and acetylation.
  • a-NAC triggers the development of system-acquired resistance in other plants when purified a-NAC protein is added to a tomato host plant, inducing plant resistance to fungal infections.
  • The biosynthesis of secondary metabolites in fungi controls fungal pathogenicity on plants and is influenced by polyamines.

Statistics:

  • The study found that the polyamines 1,3-diaminopropane and spermidine induce expression of the global regulator LaeA by several folds, increasing the formation of the a-NAC transcriptional co-activator.
  • The global regulator LaeA controls the switch from primary growth to secondary metabolite production and differentiation when an essential nutrient in the growth medium becomes limiting.
  • Spermidine extended the life of yeast cells and prolonged the half-life of penicillin gene transcripts in *Penicillium chrysogenum*.
  • The study concluded that polyamine induction of secondary metabolite biosynthetic genes in fungi is mediated by global regulator LaeA and a-NAC transcriptional coactivator, connecting it to epigenetic modification of histones.

Sources:

  • Universidad de Leon
  • Molecules, 2025,30(19):3903. (Molecules - http://www.mdpi.com/journal/molecules)
  • MDPI AG
  • DOI: 10.3390/molecules30193903
  • Juan F. Martin, Departamento de Biologia Molecular, Area de Microbiologia, Universidad de Leon, 24071 Leon, Spain
  • Keywords: Universidad de Leon, Leon, Spain, Europe, Genetics, Histones, Nucleoproteins, Nuclear Proteins