Yeast (Ups1Δ) growth assay complemented with wild-type (WT) and mutant Ups1 containing mutations in the hydrophilic patch. Ups1-3E: Ups1 mutant containing H33E, K58E, and K61E mutations; Ups1-4E: Ups1 mutant containing H33E, K58E, K61E, and K148E mutations; Ups1-5E: Ups1 mutant containing H33E, K58E, K61E, K148E, and K155E mutations; and Ups1-5A: Ups1 mutant containing H33A, K58A, K61A, K148A, and K155A mutations.