Crystal structure of porcine pancreatic phospholipase A2in complex with 2-methoxycyclohexa-2-5-diene-1,4-dione

Binding of rosmarinic acid curcumin and capsaicin with PLA2: A comparative study

Phospholipase A2 (PLA2) is a key enzyme involved in the formation of pro-inflammatory mediators like eicosanoids. Inhibition of PLA2 is regarded as one of the effective methods of controlling inflammation. The present study investigated the binding potentials of three natural compounds, rosmarinic acid (RA), capsaicin (CAP), and curcumin (CUR) by means of in silico and in vitro methods. Our study revealed that RA has relatively better binding affinity and inhibition potentials when compared to the other two molecules. Our ITC experiments were also suggested a slightly better binding energy for the RA. The stoichiometry of the protein ligand complex obtained from one of the ITC experiments suggested the possibilities of binding of a small molecule MCW (degraded product of CUR) on PLA2. Overall study demonstrated that the anti-inflammatory activity of RA, CUR and CAP may be partly due to the inhibition of PLA2.

Crystal structure of phospholipase A2 in complex with 1-naphthaleneacetic acid

Phospholipase A₂ (PLA₂ ) is one of the rate limiting enzymes involved in the production of arachidonic acid, a potent inflammatory mediator. PLA₂ is widely distributed all over the animal kingdom. It is also seen in inflammatory exudation and venoms of different organisms. The studies demonstrated that PLA₂ inhibitors have broad spectrum activities that they can either be used against inflammation or envenomation. In this study, the inhibitory activity of 1-napthaleneacetic acid (NAA) against porcine pancreatic PLA₂ has been explained through isothermal titration calorimetry and enzyme kinetics studies. The atomic level of interactions of NAA with PLA₂ was also studied using X-ray crystallography. Apart from these findings, the theoretical binding affinities and mode of interactions of two naphthalene-based NSAIDs such as naproxen (NAP) and nabumetone (NAB) were studied through molecular modeling. The studies proved that the selected ligands are binding at the doorway of the active site cleft and hindering the substrate entry to the active site. The study brings out a potential scaffold for the designing of broad spectrum PLA₂ inhibitors which can be used for inflammation or envenomation. © 2018 IUBMB Life, 70(10):995-1001, 2018.

Comparative studies on the inhibitory activities of selected benzoic acid derivatives against secretory phospholipase A2, a key enzyme involved in the inflammatory pathway

Inhibitory activities of selected benzoic acid derivatives against phospholipase A₂.