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Identification of a De Novo Peptide against Palmitoyl Acyltransferase 6 to Block Survivability and Infectivity of Leishmania donovani .
ACS Infectious Diseases 2024 May 9
Palmitoylation is an essential post-translational modification in Leishmania donovani , catalyzed by enzymes called palmitoyl acyl transferases (PATs) and has an essential role in virulence. Due to the toxicity and promiscuity of known PAT inhibitors, identification of new molecules is needed. Herein, we identified a specific novel de novo peptide inhibitor, PS1, against the PAT6 Leishmania donovani palmitoyl acyl transferase ( Ld PAT6). To demonstrate specific inhibition of Ld PAT6 by PS1, we employed a bacterial orthologue system and metabolic labeling-coupled click chemistry where both Ld PAT6 and PS1 were coexpressed and displayed palmitoylation suppression. Furthermore, strong binding of the Ld PAT6-DHHC domain with PS1 was observed through analysis using microscale thermophoresis, ELISA, and dot blot assay. PS1 specific to Ld PAT6 showed significant growth inhibition in promastigotes and amastigotes by expressing low cytokines levels and invasion. This study reveals discovery of a novel de novo peptide against Ld PAT6-DHHC which has potential to block survivability and infectivity of L. donovani .
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