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The cDNA library of venomous glands of the scorpion Buthus martensii Karsch (BmK) was constructed. A cDNA encoding a mammalian neurotoxin corresponding to the known α-type toxin, BmK M1, was amplified by polymerase chain reaction (PCR) and cloned, and its full-length sequence was determined. The open reading frame encoded the precursor of BmK M1 with 84 amino acid residues, including a signal peptide...
A new neutral mammalian neurotoxin, designated BmK M4, with an isoelectric point (pI) of 7.6 and a relatively low toxicity (ld 50 = 4.0 ± 0.25 μg/g mice, i.v.) was purified from the venom of scorpion Buthus martensii Karsch (BmK). The complete amino acid sequence of the toxin composed of 64 amino acid residues was determined by automated Edman degradation of the N-terminal part of the...
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