title: Neurotoxins of Bungarus multicinctus vernom. Purification and partial characterization.
abstract: The purification to homogeneity of nine neurotoxic components of the venom of Bungarus multicinctus is described. The purified components include alpha-bungarotoxin and two other alpha-type synaptic toxins and beta-bungarotoxin and five other beta-type synaptic toxins. The purified toxins have been characterized by electrophoresis, isoelectric focusing, amino acid analysis, and N-terminal amino acid determination. The alpha-type synaptic neurotoxins constitute a discrete class with molecular weights of 7000-8500, isoelectric points (pI) of 9.0-9.2, and N-terminal isoleucine or methionine. The beta-type synaptic neurotoxins constitute a second group with molecular weights of 20 000-22 000 and pI = 8.8-9.7. Fractions 10 through 13 exhibit a chain structure consisting of a 6000-7000 light chain and a 11 000-15 000 heavy chain apparently covalently stabilized by interchain disulfides. Fractions 9A and 14 were single chains of 11 000-14 000 which resemble the sequenced beta-type synaptic neurotoxin notexin (Halpert, J., and Eaker, D. (1975), J. Biol. Chem. 250, 6990). All of the beta-type synaptic toxins have a single tryptophan and N-terminal aspartic acid or asparagine.
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism; D000596:Amino Acids / Q000032:analysis; D002038:Bungarotoxins / Q000302:isolation & purification / Q000378:metabolism; D046911:Macromolecular Substances; D008970:Molecular Weight; D009498:Neurotoxins / Q000302:isolation & purification / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D013050:Spectrometry, Fluorescence
chemical_list: D000596:Amino Acids; D002038:Bungarotoxins; D046911:Macromolecular Substances; D009498:Neurotoxins; D000110:Acetylcholinesterase; D010744:Phosphoric Monoester Hydrolases; D010447:Peptide Hydrolases