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Arginase (EC 3.5.3.1), l-arginine decarboxylase (EC 4.1.1.19), and agmatine amidinohydrolase (EC 3.5.3.11) activities spontaneously decay in Evernia prunastri thalli incubated on 40 millimolar l-arginine used as inducer of the three enzymes if dithiothreitol is not added to the media. Lichen thalli accumulate both chloroatranorin and evernic acid in parallel to the loss of activity. These substances behave as inactivators of the enzymes at a range of concentrations between 2 and 20 micromolar, whereas several concentrations of dithiothreitol reverse, to some extent, the in vitro inactivation.

Endogenous Inactivators of Arginase, l-Arginine Decarboxylase, and Agmatine Amidinohydrolase in Evernia prunastri Thallus