title: Amino acid sequence of Trimeresurus flavoviridis phospholipase A2.
abstract: The amino acid sequence of phospholipase A2 from the venom of Trimeresurus flavoviridis (the Habu snake) was determined. The enzyme subunit has a molecular weight of 13,764 and consists of a single polypeptide chain of 122 amino acids and seven disulfide bonds. The fragmentation was conducted by digesting the reduced and S-carboxymethylated derivative of the protein with Achromobacter protease I, chymotrypsin, and trypsin, respectively. Achromobacter protease I peptides were used for alignment and to establish overlaps over chymotryptic and tryptic peptides. The automated Edman degradation of the S-carboxymethylated protein, which was extended to the N-terminal 30 amino acid residues, supplemented the deletions found with the enzymatic peptides alone. T. flavoviridis phospholipase A2 was found to be highly (65-67%) homologous in sequence to the enzymes from T. okinavensis, Crotalus adamanteus, and Crotalus atrox (viperid family) and less (35-44%) homologous to those from elapid snakes and mammalian pancreas. The T. flavoviridis enzyme appears to be similar in secondary structure composition to the C. atrox enzyme.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003435:Crotalid Venoms / Q000032:analysis*; D010450:Endopeptidases / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D010740:Phospholipases / Q000302:isolation & purification*; D010741:Phospholipases A / Q000302:isolation & purification*; D054467:Phospholipases A2; D012697:Serine Endopeptidases
chemical_list: D000596:Amino Acids; D003435:Crotalid Venoms; D010446:Peptide Fragments; D010740:Phospholipases; D010741:Phospholipases A; D054467:Phospholipases A2; D010450:Endopeptidases; D012697:Serine Endopeptidases; C036813:lysyl endopeptidase