title: Purification and characterization of a lipase from Staphylococcus aureus.
abstract: An extracellular lipase from Staphylococcus aureus (strain FN 37) was purified to homogeneity. A cell-free culture broth was subjected to ammonium sulphate precipitation, and the lipase was isolated from the resuspended pellet by adsorption chromatography on octyl-Sepharose. The purification was 957-fold, and the recovery of the octyl-Sepharose chromatography was about 100%. The specific activity of the purified lipase was 546 mU of lipase activity per micrograms protein. The purity of the final product was documented by SDS-polyacrylamide gel electrophoresis in which a homogeneous protein band of 43 kDa was found. In gel chromatography on Sephadex G-200 the lipase eluted as a homogeneous peak with an apparent molecular mass of 110 kDa, suggesting that the lipase may exist as an oligomer in physiological media. Analysis of the amino-acid composition revealed a predominance of polar, non-charged amino acids, with serine accounting for 24 mol% of the amino-acid residues.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D011232:Chemical Precipitation; D002845:Chromatography; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D008049:Lipase / Q000302:isolation & purification* / Q000378:metabolism; D008970:Molecular Weight; D013211:Staphylococcus aureus / Q000201:enzymology*
chemical_list: D000596:Amino Acids; D008049:Lipase