Enzymatic activity of invertase (EC: 3.2.1.26; encoded by SUC2) was assessed in yeast cell extracts according to previous protocols [61, 62] with the exception that the carcinogenic o-dianisidine was substituted with 4-aminophenazone/phenol [63]. A detailed description of the adapted protocol and calculation of the specific invertase activity can be found in Additional file 1. Assays were performed in biological triplicates.
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