A neurotoxic phospholipase A2 variant: Isolation and characterization from eastern regional Indian cobra (Naja naja) venom

Document Type

Article

Publication Date

2006

Abstract

CM-Sephadex C-25 column chromatography profile of Indian cobra (Naja naja) venom from eastern region showed a distinct and a dominant phospholipase peak, peak-10, while it was not seen in either southern or western venom samples. Peak-10 was subjected to CM-Sephadex C-25 and Sephadex G-50 column chromatography to isolate NN-X-PLA2. NN-X-PLA2 is a single chain protein with the relative molecular weight of 10 kDa by SDS-PAGE. It was toxic to mice with an LD50 value 0.098 mg/kg body weight (i.p.) and the mice exhibited acute neurotoxic symptoms. Upon indirect stimulation, it inhibited the twitching of frog's gastrocnemius muscle in a dose dependent manner. NN-X-PLA2 was weakly anticoagulant and devoid of cytotoxicity, myotoxicity, hemorrhage, edema inducing, and directlytic activities and effects on platelet aggregation process. Upon chemical modification independently with p-bromophenacyl bromide and acetic anhydride, NN-X-PLA2 lost both enzymatic and toxic properties. © 2006 Elsevier Ltd. All rights reserved.

Publication Title

Toxicon

Volume

47

Issue

7

First Page

727

Last Page

733

Comments

This article was published in Toxicon, Volume 47, Issue 7, Pages 727-733.

The published version is available at http://dx.doi.org/10.1016/j.toxicon.2006.01.011.

Copyright © 2006 Elsevier.

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