Tks. Kumar et al., CLONING, DIRECT EXPRESSION, AND PURIFICATION OF A SNAKE-VENOM CARDIOTOXIN IN ESCHERICHIA-COLI, Biochemical and biophysical research communications, 219(2), 1996, pp. 450-456
The cardiotoxin analogue III (CTX III), isolated from the Taiwan cobra
(Naja naja atra) venom, is a sixty-amino acid, all beta-sheet protein
. We report the direct expression of CTX III from its synthetic gene a
s inclusion bodies in Escherichia coli. The yield of the expressed pro
tein is about 40 mg/liter of the culture. CTX III trapped as inclusion
bodies is dissolved and refolded by the slow refolding technique. The
refolded protein is purified by reverse phase high performance liquid
chromatography. The purified and refolded CTX III sample is further c
haracterized by SDS-PAGE, circular dichroism, two-dimensional NMR spec
troscopy and haemolytic activity. To our knowledge, this is the first
report of the direct expression and purification of snake venom cardio
toxins. (C) 1996 Academic Press, Inc.