Recently, dipeptidyl peptidase-IV (DPP-IV) has become an effective target in the management of type-2 diabetes mellitus (T2D). The study aimed to determine the efficacy of shikimate pathway-derived phenolic acids as potential DPP-IV modulators in the management of T2D. The study explored in silico (molecular docking and dynamics simulations) and in vitro (DPP-IV inhibitory and kinetics assays) approaches. Molecular docking findings revealed chlorogenic acid (CA) among the examined 22 phenolic acids with the highest negative binding energy (-9.0 kcal/mol) showing a greater affinity for DPP-IV relative to the standard, Diprotin A (-6.6 kcal/mol). The result was corroborated by MD simulation where it had a higher affinity (-27.58 kcal/mol) forming a more stable complex with DPP-IV than Diprotin A (-12.68 kcal/mol). These findings were consistent with in vitro investigation where it uncompetitively inhibited DPP-IV having a lower IC50 (0.3 mg/mL) compared to Diprotin A (0.5 mg/mL). While CA showed promising results as a DPP-IV inhibitor, the findings from the study highlighted the significance of medicinal plants particularly shikimate-derived phenolic compounds as potential alternatives to synthetic drugs in the effective management of T2DM. Further studies, such as derivatisation for enhanced activity and in vivo evaluation are suggested to realize its full potential in T2D therapy.
Keywords: chlorogenic acid; dipeptidyl peptidase IV; diprotin A; molecular dynamics simulations; phenolic acids; type-2 diabetes mellitus.