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Updated: Aug 21, 2026

Fluorescence-Based Detection of FEN1 Nuclease Activity and Screening of Small-Molecule Inhibitors
Published on: June 27, 2025
Quantitative structure-activity relationship of sesquiterpene lactones as inhibitors of the transcription factor
Bettina Siedle1, Alfonso J García-Piñeres, Renato Murillo
1Institut für Pharmazeutische Wissenschaften, Lehrstuhl für Pharmazeutische Biologie, Universität Freiburg, 79104 Freiburg, Germany.
Abstract:
Sesquiterpene lactones (SLs) are the active compounds of a variety of traditionally used medicinal plants from the Asteraceae family. They are known to possess a considerable antiinflammatory activity in different inflammation models. They inhibit the transcription factor NF-kappaB probably by alkylating cysteine38 in the DNA binding domain of the p65 subunit. Here we investigate a set of 103 different sesquiterpene lactones representing 6 structural groups (44 germacranolides, 16 heliangolides, 22 guaianolides, 9 pseudoguaianolides, 2 hypocretenolides, 10 eudesmanolides) for their NF-kappaB inhibiting properties and the resulting IC(100)-values were submitted to a QSAR study. Properties important for the inhibition potency are discussed for the whole data set and for subsets of the different structural classes.
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