Goal was to identify N-recognins for Arginine and Leucine by comparison of biotinylated proteins from 1 week old whole Arabidopsis seedlings constitutively expressing the bait constructs R-degron-Turbo or L-degron-Turbo. M-degron-Turbo served as a negative control. The plants were treated with 50µM biotin and either the proteasome inhibitor Bortezomib (10µM) or the inhibitor of vacuolar acidification Concanamycin A (1µM) or DMSO one hour before harvest.