Fig. 3.

Withania somnifera lead phytochemical docking pose and interaction with human host CD26 protein active site. A Docking pose of standard inhibitor and lead phytochemicals at CD26 active site. B Surface structure of CD26 active site with lead compound Quercetin-3-rutinoside-7-glucoside. C Surface structure of CD26 active site with lead compound rutin. D Surface structure of S-protein interacted with standard inhibitor sitagliptin. Green and orange color represents the amino acid involved in hydrogen bonding and hydrophobic interaction