Abstract

Cardiotoxin(CTX)-analogue I was obtained in a yield of about 5.3% from the venom of naja naja atra by gel filtration on Sephadex G-50, followed by CM-cellulose column chromatography. When injected intraperitoneally in mice, its LD 50 was 2.8 (2.45–3.19) μg/g body weight. This toxin was cytotoxic to Yoshida sarcoma cells and produced contracture of the skeletal muscle as did CTX. The amino acid sequence of CTX-analogue I exhibits a high degree of homology with that of CTX from the same venom but differs in 13 positions.

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