title: The molecular mechanism of human group IIA phospholipase A2 inactivation by bolinaquinone.
abstract: 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.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università di Salerno, via Ponte Don Melillo, Fisciano, Italy.
authors.forename: Maria Chiara
authors.initials: MC
authors.lastname: Monti
authors.forename: Maria Giovanna
authors.initials: MG
authors.lastname: Chini
authors.forename: Luigi
authors.initials: L
authors.lastname: Margarucci
authors.forename: Alessandra
authors.initials: A
authors.lastname: Tosco
authors.forename: Raffaele
authors.initials: R
authors.lastname: Riccio
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bifulco
authors.forename: Agostino
authors.initials: A
authors.lastname: Casapullo
mesh_terms: 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
chemical_list: D002614:Chelating Agents; D008024:Ligands; D012717:Sesquiterpenes; C500927:bolinaquinone; D054501:Group II Phospholipases A2; C516287:PLA2G2A protein, human; D002118:Calcium