Regulation of aminopeptidase activity in the sediments of a eutrophic lake
Mallet, Clarisse; Debroas, Didier
Archiv für Hydrobiologie Volume 149 Number 2 (2000), p. 327 - 335
published: Sep 29, 2000
ArtNo. ESP141014902012, Price: 29.00 €
The aminopeptidase response of bacterial communities from anoxic sediments to inputs of organic matter was investigated by substrate enrichment experiments with particulate organic matter (phytoplankton) and polymer (proteins, cellobiose and starch) and monomer (glucose and amino acids) organic compounds. Changes in specific aminopeptidase activity were observed over an 11 days incubation period under in situ temperatures. The pattern of this activity was related to polymer compounds and more precisely to enrichments with proteins. The results showed that monomer compounds did not inhibit activity. Thus, mechanisms of aminopeptidase regulation seem to be different in freshwater sediment from other aquatic environments.