Substrate-specific suppression of
doa4 degradation defects by mutations in the
DID genes. Pulse-chase analysis of α2 (A), Leu-βgal
(B), and Ub-Proβgal (C) in congenic wild-type,
doa4Δ, and doa4Δ
didΔ strains. For analysis of α2 degradation, cells
expressed the transcriptional repressor from the chromosomal
MAT locus. For analysis of Leu-βgal and Ub-Proβgal
degradation, expression of plasmid-derived fusion proteins was induced
with galactose (Bachmair et al., 1986).