The molecular mechanism of human group IIA phospholipase A2 inactivation by bolinaquinone.
The molecular basis of the human group IIA secretory phospholipase A(2) inactivation by bolinaquinone (BLQ), a hydroxyquinone marine terpenoid, has been investigated for the comprehension of its relevant antiinflammatory properties, through the combination of spectroscopic techniques, biosensors analysis, mass spectrometry (MS) and molecular docking. Indeed, sPLA(2)s are well known to be implicated in the pathogenesis of inflammation such as rheumatoid arthritis, septic shock, psoriasis and asthma. Our results suggest a mechanism of competitive inhibition guided by a non-covalent molecular recognition event, disclosing the key role of the BLQ hydroxyl-quinone moiety in the chelation of the catalytic Ca(2+) ion inside the enzyme active site.The understanding of the sPLA(2)-IIA inactivation mechanism by BLQ could be useful for the development of a new chemical class of PLA(2) inhibitors, able to specifically target the enzyme active site.
Monti
Maria Chiara
MC
Dipartimento di Scienze Farmaceutiche, Università di Salerno, via Ponte Don Melillo, Fisciano, Italy.
Chini
Maria Giovanna
MG
Margarucci
Luigi
L
Tosco
Alessandra
A
Riccio
Raffaele
R
Bifulco
Giuseppe
G
Casapullo
Agostino
A
D000818:Animals; D002118:Calcium / Q000737:chemistry; D002384:Catalysis; D020134:Catalytic Domain; D002614:Chelating Agents / Q000737:chemistry; D004789:Enzyme Activation; D054501:Group II Phospholipases A2 / Q000737:chemistry*; D006801:Humans; D007700:Kinetics; D008024:Ligands; D013058:Mass Spectrometry / Q000379:methods; D008968:Molecular Conformation; D011485:Protein Binding; D012717:Sesquiterpenes / Q000737:chemistry* / Q000494:pharmacology; D020349:Surface Plasmon Resonance / Q000379:methods
D002614:Chelating Agents; D008024:Ligands; D012717:Sesquiterpenes; C500927:bolinaquinone; D054501:Group II Phospholipases A2; C516287:PLA2G2A protein, human; D002118:Calcium