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Caseinolytic protease P (ClpP) maintains essential roles in bacterial homeostasis. As such, both the inhibition and activation of this enzyme result in bactericidal activity, making ClpP a promising target for antibacterial drug development. Herein, we report the results of a fluorescence-based screen of ∼450 structurally diverse fungal and bacterial secondary metabolites. Sclerotiamide (1), a paraherquamide-related indolinone, was identified as the first non-peptide-based natural product activator of ClpP. Structure-activity relationships arising from the initial screen, preliminary biochemical evaluation of 1, and rationale for the exploitation of this chemotype to develop novel ClpP activators are presented.

Sclerotiamide: The First Non-Peptide-Based Natural Product Activator of Bacterial Caseinolytic Protease P