Biosynthesis and Biological Activity of Phenylphenalenone Compounds

Phenylphenalenones are a distinctive class of polycyclic secondary metabolites predominantly found in plants of the Musaceae and Haemodoroideae families. Generated via a polyketide-derived route, their biosynthesis is initiated by the formation of diarylheptanoid intermediates through successive condensations of aromatic precursors. An intramolecular Diels–Alder cyclisation of these intermediates yields the tricyclic phenylphenalenone core, which undergoes further tailored modifications such as oxidation, methylation and glycosylation to produce a diverse array of natural derivatives. Functionally, these compounds serve as phytoalexins, accumulating in plant tissues in response to pathogen attack, herbivory and environmental stress. They exhibit broad-spectrum biological activities, including antifungal, antibacterial, cytotoxic and phytotoxic effects, often mediated through disruption of cellular integrity, enzyme inhibition and generation of reactive oxygen species. Advances in transcriptomics, enzymology and structural chemistry have begun to unravel the specific enzymes and gene clusters that orchestrate each step of the biosynthetic pathway. Beyond their role in plant defence, phenylphenalenones have attracted interest for agricultural applications as natural crop protectants and for pharmaceutical exploration as potential therapeutic leads.

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Biosynthesis and Biological Activity of Phenylphenalenone Compounds publication trend

The graph below shows the total number of articles in biosynthesis and biological activity of phenylphenalenone compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Phytoalexin: A low-molecular-weight antimicrobial compound synthesised by plants in response to biotic or abiotic stress.

Diarylheptanoid: A linear seven-carbon chain linking two aromatic rings, serving as a key biosynthetic precursor to phenylphenalenones.

Intramolecular Diels–Alder reaction: A cycloaddition reaction within a single molecule that forms the tricyclic core characteristic of phenylphenalenones.

Glycosylation: The enzymatic attachment of sugar moieties to aglycone frameworks, modulating solubility and bioactivity of natural products.

References

1. Phenylphenalenones and Linear Diarylheptanoid Derivatives Are Biosynthesized via Parallel Routes in Musella lasiocarpa, the Chinese Dwarf Banana. Organic Letters (2024).
2. Differentiating Dyes: A Spectroscopic Investigation into the Composition of Scarlet Bloodroot (Haemodorum coccineum R.Br.) Rhizome. Molecules (2023).
3. Diarylheptanoid Derivatives (Musellins A–F) and Dimeric Phenylphenalenones from Seed Coats of Musella lasiocarpa, the Chinese Dwarf Banana. Journal of Natural Products (2023).