A method for determining exoproteolytic activity in natural waters
Somville, M.; Billen, G. (1983). A method for determining exoproteolytic activity in natural waters. Limnol. Oceanogr. 28(1): 190-193. http://dx.doi.org/10.4319/lo.1983.28.1.0190
A very sensitive method allowing determination of exoproteolytic activity in natural water is based on the use of aminoacyl-ß-naphthylamide, which gives rise to a fluorescent product upon hydrolysis of its peptidelike bond by filtered or unfiltered water samples. Specificity of the method to exoproteases is demonstrated by a strong competitive inhibition effect of added proteins.A good correlation is found between exoproteolytic activity and the rate of amino acid utilization by microheterotrophs in various aquatic environments.
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