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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The purification and amino acid sequence of the lethal neurotoxin Tx1 from the venom of the Brazilian 'armed' spider Phoneutria nigriventer.
FEBS Letters 1990 April 25
A lethal neurotoxic polypeptide of Mr 8 kDa was purified from the venom of the South American 'armed' or wandering spider Phoneutria nigriventer by centrifugation, gel filtration on Superose 12, and reverse phase FPLC on columns of Pharmacia PepRPC and ProRPC. The purified neurotoxin Tx1 had an LD50 of 0.05 mg/kg in mice following intracerebroventricular injection. The complete amino acid sequence of the neurotoxin was determined by automated Edman degradation of the native and S-carboxymethylated protein in pulsed liquid and dual phase sequencers, and by the manual DABITC/PITC double coupling method applied to fragments obtained after digestions with the S. aureus V8 protease and trypsin. The neurotoxin Tx1 consists of a single chain of 77 amino acid residues, which contains a high proportion of cysteine. The primary structure showed no homology to other identified spider toxins.
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