Increased amount of extracellular protein was detected in those Pseudomonas aeruginosa strains harbouring certain plasmids.
Increased level of extracellular protein was detected in the presence of kanamycin or tetracycline.
All antibiotics inhibited total activity of protease(s) except alkaline protease (AprA).
Tetracycline and kanamycin interfered with AprA production.
The effect of AprA on extracellular protein levels was limited.