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The steady-state level of Ho-LacZ activity expressed as a percent of LacZ activity in cells in which mutant (K48R,G76A) ubiquitin (ubi*) is overexpressed is compared with that in cells overexpressing normal ubiquitin (ubi). The same experiment is shown for a mutant of the Rpt2 subunit of the 19S lid of the proteasome compared with its congenic wild type. Ho is stabilized by mutant ubiquitin overexpression and also in the rpt2 mutant.
