title: Resolution of isotoxins in the beta-bungarotoxin family.
abstract: Although only five isotoxins of the beta-bungarotoxin family had been claimed, this work indicated the existence of more than sixteen isotoxins. Crude snake (Bungarus multicinctus) venom was divided into four main fractions by gel filtration on a Sephadex G-50 column. beta-Bungarotoxin appeared in a major fraction that contained mainly the M(r) 20,000 protein components. The fraction could be further resolved into eighteen peaks designated P1-P18 by HPLC on a Protein Pak SP 5PW column that was eluted with a linear gradient of 0.1-0.6 M CH3COONa in 20 mM NaH2PO4-Na2HPO4 at pH 7.4 P3-P18 were demonstrated to be isotoxins of the beta-bungarotoxin family. Results of protein sequencing for P8, P9 and P11, the three main isotoxins, confirmed that they shared a common phospholipase A2 subunit, which was very similar to although not completely identical with the A1 chain reported previously.
authors.affiliation: Institute of Biochemical Sciences, College of Science, National Taiwan University, Taipei.
authors.forename: C C
authors.initials: CC
authors.lastname: Chu
authors.forename: S H
authors.initials: SH
authors.lastname: Li
authors.forename: Y H
authors.initials: YH
authors.lastname: Chen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002038:Bungarotoxins / Q000737:chemistry / Q000302:isolation & purification*; D017838:Bungarus; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D007536:Isomerism; D008969:Molecular Sequence Data
chemical_list: D002038:Bungarotoxins