Quantitation and enzymatic activity of the alkaline protease from Pseudomonas aeruginosa in culture supernatants from clinical strains.
Alkaline protease from Pseudomonas aeruginosa (E.C. 3.4.24.40), also called pseudomonal serralysin, plays an important role in the infection bacterial process. The alkaline protease concentration and activity in the culture supernatants of 23 Pseudomonas aeruginosa strains from patients suffering from cystic fibrosis were determined by using an ELISA procedure and a specific enzymatic activity test. No correlation was demonstrated between the activity and the concentration of alkaline protease. This could be explained by the presence of an inactive precursor and a partial hydrolysis of the enzyme, confirmed by SDS-PAGE and Western blotting in the supernatants. The activity test is the only one allowing a quantification of the presence of an active form of alkaline protease.
Laboratoire de Biochimie Analytique et de Synthese Bioorganique, Université Claude Bernard Lyon 1, Villeurbanne, France.
D
D
Louis
P
P
Sorlier
J
J
Wallach
D015153:Blotting, Western; D003550:Cystic Fibrosis / Q000150:complications / Q000382:microbiology; D004789:Enzyme Activation; D004792:Enzyme Precursors / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008666:Metalloendopeptidases / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D008970:Molecular Weight; D009894:Opportunistic Infections / Q000150:complications / Q000382:microbiology; D011552:Pseudomonas Infections / Q000150:complications / Q000382:microbiology; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000302:isolation & purification; D013183:Sputum / Q000382:microbiology
D004792:Enzyme Precursors; D008666:Metalloendopeptidases; C095666:serralysin