title: An improved purification procedure for rat liver lysosomal phospholipase A1.
abstract: A purification procedure is presented for the isolation of lysosomal acid phospholipase A1 (PLA1) from livers of non-pretreated rats, in a high yield and purity. The purification starts from a crude mitochondrial-lysosomal fraction. PLA1 is solubilised and subsequently purified by chromatography on concanavalin A-Sepharose, by chromatofocusing, and by gel filtration. After chromatofocusing, the enzyme is already purified 50200-fold with a yield of 50%, and after gel filtration 56600-fold with a yield of 7%. Purified PLA1 exhibits a specific activity of approx. 8.2 mumol phosphatidylethanolamine (preferred substrate) hydrolysed per min per mg protein, and upon chromatofocusing an apparent isoelectric point of 5.3 Gel filtration of purified PLA1 suggests a molecular mass of about 29 kDa, whereas in SDS-PAGE two proteins of 27 kDa and 55 kDa (mass ratio about 1/2) were visualised.
authors.affiliation: Max-Planck-Institut für Experimentelle Medizin, Göttingen, FRG.
authors.forename: B M
authors.initials: BM
authors.lastname: Löffler
authors.forename: H
authors.initials: H
authors.lastname: Kunze
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D002846:Chromatography, Affinity / Q000379:methods; D002850:Chromatography, Gel / Q000379:methods; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D008099:Liver / Q000201:enzymology*; D008247:Lysosomes / Q000201:enzymology*; D008297:Male; D010740:Phospholipases / Q000302:isolation & purification*; D010741:Phospholipases A / Q000302:isolation & purification* / Q000378:metabolism; D054466:Phospholipases A1; D051381:Rats; D011919:Rats, Inbred Strains; D012995:Solubility
chemical_list: D010740:Phospholipases; D010741:Phospholipases A; D054466:Phospholipases A1