Characterization of phospholipase A2 (PLA2) from Echis ocellatus venom.


Sallau, A.B., Ibrahim, M. A., Salihu, A. and Patrick, F.U

Phospholipase A2 (EC. was isolated and partially characterized from the venom of Echis ocellatus. The enzyme was purified 13.5-fold with a yield of 86.69% on DEAE-Sephadex G-75 column. The PLA2 from E. ocellatus venom had broad pH and temperature ranges with optima of 7.5 and 40o C respectively. Initial velocity studies for the determination of kinetic constants with L- - lecithin as substrate revealed a Km and Vmax of 1mg/ml and 0.35 moles/min respectively. The enzyme activity was enhanced by Ca2+ and strongly inhibited by Mg2+ and Co2+. Cu2+ was fairly inhibitory to the enzyme. The relevance of these findings towards understanding the biochemistry of E. ocellatus envenomation and development of antivenom for E. ocellatus venom is discussed.

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