title: Purification, some properties and amino-acid sequences of two phospholipases A (CM-II and CM-III) from Naja naja kaouthia venom.
abstract: Two phospholipases A, CM-II and CM-III, were purified from the Siamese cobra (Naja naja kaouthia) venom, from Thailand, by gel filtration on Sephadex G-50 followed by ion-exchange chromatography on CM-cellulose. They each comprise 119 amino acid residues including 14 half-cystine residues. The complete primary structures of the two phospholipases A have been elucidated and their sequences are 96% identical. The sequences, the invariant amino acid residues and the sequences around the active center (histidine-48) of CM-II and CM-III resemble those from other snake venoms and also from mammalian pancreas. Further, the cysteine residues are in similar locations to those in phospholipase A of known structure so they are presumed to link similarly. The two phospholipases A from N.n. kaouthia venom each contain a single histidine residue which is located at the active center (histidine-48). The toxicities of the two enzymes differ among themselves, but are comparable to those encountered for phospholipases A from African cobra venoms.
mesh_terms: D000595:Amino Acid Sequence; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D002918:Chymotrypsin; D004546:Elapid Venoms / Q000032:analysis*; D010740:Phospholipases / Q000302:isolation & purification*; D010741:Phospholipases A / Q000302:isolation & purification*; D014357:Trypsin
chemical_list: D004546:Elapid Venoms; D010740:Phospholipases; D010741:Phospholipases A; D002918:Chymotrypsin; D014357:Trypsin