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|Title:||Role of enzymatic activity in the antiplatelet effects of a phospholipase A2 from Ophiophagus hannah snake venom||Authors:||Huang, M.Z.
Venom phospholipase A2
|Issue Date:||24-Oct-1997||Citation:||Huang, M.Z.,Gopalakrishnakone, P.,Kini, R.M. (1997-10-24). Role of enzymatic activity in the antiplatelet effects of a phospholipase A2 from Ophiophagus hannah snake venom. Life Sciences 61 (22) : 2211-2217. ScholarBank@NUS Repository.||Abstract:||A phospholipase A2 (OHV A-PLA2) from the venom of Ophiophagus hannah (King cobra) is an acidic protein exhibiting antiplatelet activity. In in vitro tests, OHV A-PLA2 showed a marked inhibitory effect on platelet aggregation induced by ADP, collagen and arachidonic acid in both human whole blood and platelet-rich plasma in a dose-dependent manner. The antiplatelet effects of HOV A-PLA2 did not increase when preincubation times of platelets and OHV A-PLA2 did not increase when preincubation times of platelets and OHV A-PLA2 were prolonged indicating phospholipid hydrolysis did not significantly contribute to the antiplatelet effects. Alkylation of active site His residue using p-bromophenacyl bromide resulted in the complete loss of enzymatic activity, but the modified enzyme retained more than 30% of its antiplatelet effects. These results indicate that the antiplatelet effects of OHV A-PLA2 appear to be independent of its enzymatic activity, and there are separate sites responsible for the catalytic and antiplatelet activities.||Source Title:||Life Sciences||URI:||http://scholarbank.nus.edu.sg/handle/10635/116577||ISSN:||00243205|
|Appears in Collections:||Staff Publications|
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