Biological Activity of Prenylated Flavonoids in Medicinal Plants

Prenylated flavonoids are flavonoid compounds bearing one or more hydrophobic prenyl side chains, which markedly enhance their interaction with biological membranes and molecular targets. These modifications often confer superior antimicrobial, antifungal, anticancer and anti-inflammatory activities compared with non-prenylated analogues. In medicinal plants, such as species of Erythrina, Glycyrrhiza and Bituminaria, prenylated flavonoids serve dual roles: they function in plant defence and symbiosis, and they underpin traditional remedies for infections, metabolic disorders and cancer. Recent advances in metabolomics and structural biology have elucidated their biosynthetic pathways, revealing how environmental stimuli, such as intercropping or pathogen challenge, trigger specific prenyltransferases. On the pharmacological front, detailed mechanistic studies show that membrane permeabilisation, enzyme inhibition and modulation of cellular signalling pathways lie at the heart of their bioactivity. The global significance of these compounds lies in their potential as leads for new antimicrobial agents, natural food preservatives and adjuvants in cancer therapy, addressing urgent needs in public health and sustainable agriculture.

Research from Nature Portfolio

Recent studies have applied quantitative structure–activity relationship (QSAR) modelling to large datasets of prenylated (iso)flavonoids, revealing that the position and number of prenyl groups, combined with molecular shape descriptors and hydrophobic surface area, govern antibacterial potency against both Gram-positive and Gram-negative bacteria. In one report, robust in-silico models achieved predictive accuracies above 70 % and identified distinct pharmacophoric arrangements responsible for efficient membrane permeabilisation, linked to low hydrophilic surface area. A complementary investigation focused on methicillin-resistant Staphylococcus aureus (MRSA), evaluating 23 prenylated compounds and integrating new in-house data with literature values. That work confirmed that di-prenylated flavanones and isoflavones attain minimum inhibitory concentrations of 10 µg/mL or below, and highlighted the unexpected role of formal charge, alongside hydrophobic volume and hydrogen-bonding capacity, in determining anti-MRSA activity. These Nature Portfolio contributions establish a mechanistic framework for rational design of next-generation antimicrobial flavonoids.

Biological Activity of Prenylated Flavonoids in Medicinal Plants publication trend

The graph below shows the total number of articles in biological activity of prenylated flavonoids in medicinal plants across all publications each year (not limited to Nature Index journals).

Technical terms

Prenylation: addition of a hydrophobic hydrocarbon chain to a molecule, enhancing lipophilicity and membrane affinity.
Flavonoid: a class of plant polyphenols characterised by a C6–C3–C6 skeleton of two benzene rings and a heterocyclic ring.
Isoflavonoid: a subclass of flavonoids in which the B-ring is attached to the 3-position of the central heterocycle.
Pterocarpan: a fused-ring derivative of isoflavonoids featuring two oxygen-containing rings.
QSAR (quantitative structure–activity relationship): computational models correlating chemical structures with measured biological activities.
Minimum inhibitory concentration (MIC): the lowest concentration of a compound that prevents visible growth of a microorganism.

References

1. QSAR-based molecular signatures of prenylated (iso)flavonoids underlying antimicrobial potency against and membrane-disruption in Gram positive and Gram negative bacteria. Scientific Reports (2018).
2. Insights into the molecular properties underlying antibacterial activity of prenylated (iso)flavonoids against MRSA. Scientific Reports (2021).
3. Prenyl Pterocarpans from Algerian Bituminaria bituminosa and Their Effects on Neuroblastoma. Molecules (2024).
4. Prenylated (iso)flavonoids as antifungal agents against the food spoiler Zygosaccharomyces parabailii. Food Control (2022).
5. Intercropping of Hordeum vulgare L. and Lupinus angustifolius L. causes the generation of prenylated flavonoids in Lupinus angustifolius L.. Journal of Plant Interactions (2023).