| ORIGINAL ARTICLES |
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Rational search for natural antimicrobial compounds: relevance of sesquiterpene lactones |
| Alejandro Recio-Balsells1,2, Eugenia Rodriguez Ristau1,2, Adriana Pacciaroni1,2, Viviana Nicotra1,2, Carina Casero1,2, Manuela García1,2 |
1. Instituto Multidisciplinario de Biología Vegetal (IMBIV), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba, Argentina;
2. Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (UNC), Ciudad Universitaria, X5000HUA, Córdoba, Argentina |
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Abstract Antimicrobial resistance is one of the most pressing global health challenges, as many pathogens are rapidly evolving to evade existing treatments. Despite this urgent need for new solutions, natural plant-derived compounds remain relatively underexplored in the development of antimicrobial drugs. This report highlights an innovative approach to discovering potent antimicrobial agents through bioguided fractionation of numerous plant species from the rich Argentinean flora. By systematically screening 60 species (over 177 extracts) for antimicrobial activity against representative strains of gram-positive and gram-negative bacteria, we identified promising bioactive compounds within the Asteraceae family—particularly sesquiterpene lactones from the Xanthium genus. Building on this basis, we synthesized semi-synthetic derivatives by chemically modifying plant sub-extracts, focusing on structures incorporating heteroatoms and/or heterocycles containing oxygen and nitrogen (important for the bioavailability and bioactivity that they are capable of providing). These modifications were evaluated for their potential to enhance antimicrobial efficacy against bacteria and Candida species, including resistant strains. Our findings suggest that tailoring natural metabolites from Xanthium and related Asteraceae species can significantly improve their antimicrobial properties. This strategy offers a promising pathway for the development of novel therapeutic agents to combat bacterial and fungal infections in an era of rising drug resistance.
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| Keywords
Sesquiterpene lactones
Antimicrobials
Semisynthetic derivatives
Bioguided study
Extract derivatization
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| Fund:This work has been financed by ONR Global [Grant N62909-21-1-2052, USA], CONICET [grant number PIP-CONICET 2022-2024, 11220200101065CO], ANPCyT [grant numbers PICT 2020- SERIEA-02162 (2022-2025) and PICT 2020- SERIEA-3702 (2022-2024)], and SeCyT-UNC [grant number 2023-CONSOLIDAR-33620230100785CB01]. |
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Issue Date: 18 June 2025
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