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Characteristics of phospholipase A2 mutant of the starfish Asterina pectinifera

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タイトル: Characteristics of phospholipase A2 mutant of the starfish Asterina pectinifera
著者: Kishimura, Hideki 著作を一覧する
Ando, Seiichi 著作を一覧する
キーワード: Asterina pectinifera
Phospholipase A2
Pancreatic loop
Polar-group specificity
発行日: 2007年 2月 5日
出版者: Elsevier
誌名: Enzyme and Microbial Technology
巻: 40
号: 3
開始ページ: 461
終了ページ: 465
出版社 DOI: 10.1016/j.enzmictec.2006.07.022
抄録: Site-directed mutagenesis study of phospholipase A2 (PLA2) from the pyloric ceca of starfish Asterina pectinifera was used to probe the relationship between polar-group specificity and structure of the pancreatic loop region. The sequence of the cDNA encoding the starfish PLA2 was exchanged by the oligonucleotide-directed dual amber-long and accurate polymerase chain reaction method to insert Lys residue between Cys-62 and Gly-63. The modified cDNA was inserted into the expression plasmid pET-16b, and PLA2 mutant was expressed in Escherichia coli Origami™ B (DE3) by induction with isopropyl-beta-d(−)-thiogalactopyranoside. The starfish PLA2 mutant showed essentially the same properties as the starfish native PLA2 with respect to substrate positional specificity, optimum pH, optimum temperature, Ca2+ requirement, and sodium deoxycholate requirement. However, the specific activity of the starfish PLA2 mutant for egg yolk PC (950 U/mg) was extremely lower than that of native PLA2 (119,000 U/mg), but close to that of porcine pancreatic PLA2 (4300 U/mg). Moreover, the ratio of specific activity of the PLA2 mutant for phosphatidylcholine to phosphatidylethanolamine (98 times) was highly lower than that of native PLA2 (2650 times), but similar to that of porcine pancreatic PLA2 (25 times). Therefore, it was suggested that the charge and structure of pancreatic loop region of the starfish PLA2 might carry out important role on polar-group specificity.
Relation (URI):
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 岸村 栄毅


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