New sulphonamide pyrolidine carboxamide derivatives: Synthesis, molecular docking, antiplasmodial and antioxidant activities.

ABSTRACT: Carboxamides bearing sulphonamide functionality have been shown to exhibit significant lethal effect on Plasmodium falciparum, the causative agent of human malaria. Here we report the synthesis of thirty-two new drug-like sulphonamide pyrolidine carboxamide derivatives and their antiplasmodial and antioxidant capabilities. In addition, molecular docking was used to check their binding affinities for homology modelled P. falciparum N-myristoyltransferase, a confirmed drug target in the pathogen. Results revealed that sixteen new derivatives killed the parasite at single-digit micromolar concentration (IC50 = 2.40-8.30 ?M) and compounds 10b, 10c, 10d, 10j and 10o scavenged DPPH radicals at IC50s (6.48, 8.49, 3.02, 6.44 and 4.32 ?g/mL respectively) comparable with 1.06 ?g/mL for ascorbic acid. Compound 10o emerged as the most active of the derivatives to bind to the PfNMT with theoretical inhibition constant (Ki = 0.09 ?M) comparable to the reference ligand pyrazole-sulphonamide (Ki = 0.01 ?M). This study identifies compound 10o, and this series in general, as potential antimalarial candidate with antioxidant activity which requires further attention to optimise activity.

SUBMITTER: Onoabedje EA 

PROVIDER: S-EPMC7904193 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature