title: Purification, characterization and gene cloning of a novel phospholipase A2 from the venom of Agkistrodon blomhoffii ussurensis.
abstract: A new phospholipase A2 with Gln at the site 49, abbreviated as Gln49-PLA2, has been purified from the venom of Agkistrodon blomhoffii ussurensis by using ion-exchange chromatography, gel filtration chromatography and reversed-phase HPLC, and behaves as a single-band on SDS-PAGE. Its molecular weight is 13881.85+/-0.33 Da given by mass spectrometry and pI is about 8.56 given by isoelectric focusing. Gln49-PLA2 does not show phospholipase A2 and hemorrhagic activity, whereas shows weak toxic and apparent anticoagulant activity. Based on the N-terminal sequencing and peptide mass fingerprint analysis, Gln49-PLA2 cDNA has been cloned by means of RT-PCR. Gln49-PLA2 consists of 122 amino acid residues and has the structural features of class II of snake venom phospholipase A2.
authors.affiliation: Department of Bioscience and Biotechnology, Dalian University of Technology, 2 Linggong Road, Dalian 116024, PR China. yongmingbao@sohu.com
authors.forename: Yongming
authors.initials: Y
authors.lastname: Bao
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Bu
authors.forename: Liji
authors.initials: L
authors.lastname: Jin
authors.forename: Wang
authors.initials: W
authors.lastname: Hongxia
authors.forename: Qing
authors.initials: Q
authors.lastname: Yang
authors.forename: Lijia
authors.initials: L
authors.lastname: An
mesh_terms: D017836:Agkistrodon; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D003001:Cloning, Molecular; D003435:Crotalid Venoms / Q000235:genetics* / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D005998:Glycine / Q000737:chemistry; D007525:Isoelectric Focusing; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010449:Peptide Mapping; D010741:Phospholipases A / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification*; D054467:Phospholipases A2; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020539:Sequence Analysis, Protein
chemical_list: D003435:Crotalid Venoms; D010741:Phospholipases A; D054467:Phospholipases A2; D005998:Glycine