Mellergaard S
J Appl Bacteriol. 1983 Apr;54(2):289-94. doi: 10.1111/j.1365-2672.1983.tb02619.x.
A proteolytic enzyme produced by the fish pathogen Aeromonas salmonicida was isolated and purified. It showed the following characteristics: temperature optimum at 48 degrees C, pH optimum at pH 9 and a molecular weight of 87500. The enzyme was inhibited by phenylmethanesulphonylfluoride (PMSF) indicating it to be a serine protease.