title: Purification of a Class B1 platelet aggregation inhibitor phospholipase A2 from Indian cobra (Naja Naja) venom.
abstract: A platelet aggregation inhibitor phospholipase A(2) (NND-IV-PLA(2)) was isolated from Naja naja (Eastern India) venom by a combination of cation and anion exchange chromatography. NND-IV-PLA(2) is the most catalytically active enzyme isolated from the Indian cobra venom. The acidic PLA(2) profile of Eastern regional Indian cobra venom is distinctly different from that of the western regional venom. However the acidic PLA(2)s from both the regions follow the pattern of increasing catalytic activity with increase in acidic nature of the PLA(2) isoform. NND-IV-PLA(2) is a Class B1 platelet aggregation inhibitor and inhibits platelet aggregation induced by ADP, collagen and epinephrine. Modification of active site histidine abolishes both catalytic activity and platelet aggregation inhibition activities while aristolochic acid, a phospholipase A(2) inhibitor has only partial effect on the two activities.
authors.affiliation: Department of Studies in Biochemistry, University of Mysore, Manasagangothri, Mysore, India.
authors.forename: S
authors.initials: S
authors.lastname: Satish
authors.forename: J
authors.initials: J
authors.lastname: Tejaswini
authors.forename: T P
authors.initials: TP
authors.lastname: Krishnakantha
authors.forename: T Veerabasappa
authors.initials: TV
authors.lastname: Gowda
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000818:Animals; D034341:Aristolochic Acids / Q000494:pharmacology; D002853:Chromatography, Liquid; D002942:Circular Dichroism; D003094:Collagen / Q000494:pharmacology; D004546:Elapid Venoms / Q000737:chemistry / Q000201:enzymology*; D017815:Elapidae; D004837:Epinephrine / Q000494:pharmacology; D006801:Humans; D007194:India; D010741:Phospholipases A / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism*; D054467:Phospholipases A2; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D034341:Aristolochic Acids; D004546:Elapid Venoms; D010975:Platelet Aggregation Inhibitors; D000244:Adenosine Diphosphate; D003094:Collagen; C000228:aristolochic acid I; D010741:Phospholipases A; D054467:Phospholipases A2; D004837:Epinephrine