title: A rapid method for purification of homogeneous Legionella pneumophila cytotoxic protease using fast protein liquid chromatography.
abstract: A purification method was developed to isolate Legionella pneumophila cytotoxic protease in a form suitable for biological assays. Culture supernatant of a clinical isolate of L. pneumophila, Knoxville 1 strain, was used as the starting material. The protease was purified by FPLC on a Mono Q column followed by ultrafiltration. The isolated proteolytic enzyme has a specific activity of 90 azocasein units/mg protein and is a 42 kDa monomeric protein as determined by SDS-PAGE and gel filtration chromatography. It is heat-labile and toxic to a variety of cells e.g. McCoy, SIRC, HeLa, and rhabdomyosarcoma cells, baby hamster and green monkey kidney cells, and human embryonic lung fibroblasts.
authors.affiliation: Department of Clinical Microbiology, Statens Seruminstitut, Rigshospitalet, Copenhagen, Denmark.
authors.forename: C
authors.initials: C
authors.lastname: Rechnitzer
authors.forename: M
authors.initials: M
authors.lastname: Tvede
authors.forename: G
authors.initials: G
authors.lastname: Döring
mesh_terms: D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002853:Chromatography, Liquid; D007875:Legionella / Q000201:enzymology*; D010447:Peptide Hydrolases / Q000302:isolation & purification* / Q000633:toxicity
chemical_list: D010447:Peptide Hydrolases