Abstract
The nucleotide sequence of a type of chlorotoxin-like peptide, an inhibitor of small-conductance Cl(-) channels, from the scorpion, Buthus martensii Karsch, was synthesized (named rBmK CTa) according to the sequence optimized for codon usage in E. coli. It was over-expressed using a pExSecI expression system and purified to homogeneity. Polycolonal antibodies to the purified protein were raised in rats. Overlay assay and pull-down assay showed that this toxin specially binds to two proteins in the glioma cells with corresponding molecular weights of about 80 and 35 kDa. They may serve as candidate receptors or alternative cellular component for interaction with rBmK CTa.
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