title: Purification and characterization of an alkaline lipase from Pseudomonas fluorescens AK102.
abstract: An extracellular, novel alkaline lipase produced by Pseudomonas fluorescens AK102 was purified by ultrafiltration, ammonium sulfate precipitation, and DEAE-Toyopearl 650M and Phenyl-Toyopearl 650M column chromatographies. The purified enzyme was homogeneous on SDS-PAGE. The molecular weight was estimated to be about 33,000 by SDS-PAGE. The isoelectric point was pH 4.0 by isoelectric focusing. The pH stability was 4 to 10 and the optimum pH was 8 to 10. The optimum temperature was 55 degrees C and the enzyme was stable below 50 degrees C. The enzyme unspecifically liberated short chain to long chain fatty acids from p-nitrophenyl esters, methyl esters, and triglycerides. In the presence of an anionic surfactant, the enzyme was characteristically stable. These results suggested that the enzyme can be used as a home laundry product ingredient.
authors.affiliation: Research and Development Division, Amano Pharmaceutical Co., Ltd., Aichi, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kojima
authors.forename: M
authors.initials: M
authors.lastname: Yokoe
authors.forename: T
authors.initials: T
authors.lastname: Mase
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D010450:Endopeptidases / Q000494:pharmacology; D004795:Enzyme Stability; D006863:Hydrogen-Ion Concentration; D007526:Isoelectric Point; D008049:Lipase / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011551:Pseudomonas fluorescens / Q000145:classification / Q000201:enzymology*; D017386:Sequence Homology, Amino Acid; D012967:Sodium Dodecyl Sulfate; D013379:Substrate Specificity; D013501:Surface-Active Agents / Q000494:pharmacology; D013696:Temperature; D014462:Ultrafiltration
chemical_list: D001426:Bacterial Proteins; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; D008049:Lipase; D010450:Endopeptidases