title: Secretion of elastinolytic enzymes and their propeptides by Pseudomonas aeruginosa.
abstract: Elastase of Pseudomonas aeruginosa is synthesized as a preproenzyme. The signal sequence is cleaved off during transport across the inner membrane and, in the periplasm, proelastase is further processed. We demonstrate that the propeptide and the mature elastase are both secreted but that the propeptide is degraded extracellularly. In addition, reduction of the extracellular proteolytic activity led to the accumulation of unprocessed forms of LasA and LasD in the extracellular medium, which shows that these enzymes are secreted in association with their propeptides. Furthermore, a hitherto undefined protein with homology to a Streptomyces griseus aminopeptidase accumulated under these conditions.
authors.affiliation: Department of Molecular Cell Biology, Utrecht University, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: Braun
authors.forename: A
authors.initials: A
authors.lastname: de Groot
authors.forename: W
authors.initials: W
authors.lastname: Bitter
authors.forename: J
authors.initials: J
authors.lastname: Tommassen
mesh_terms: D001426:Bacterial Proteins; D002462:Cell Membrane / Q000378:metabolism; D004792:Enzyme Precursors / Q000096:biosynthesis / Q000378:metabolism*; D008666:Metalloendopeptidases / Q000235:genetics / Q000378:metabolism*; D010196:Pancreatic Elastase / Q000096:biosynthesis* / Q000378:metabolism*; D019897:Periplasm / Q000201:enzymology; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000235:genetics; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D004792:Enzyme Precursors; C095769:LasD protein, Pseudomonas aeruginosa; D012697:Serine Endopeptidases; C022443:proelastase; D010196:Pancreatic Elastase; D008666:Metalloendopeptidases; C066371:staphylolytic protease