A role for TRIP12 in regulating the E3 ligase network under proteotoxic stress

TRIP12 is upregulated in melanoma cells during proteasome inhibition, and its loss causes widespread protein abundance reductions, especially across ubiquitin E3 ligases, under proteotoxic stress.

• Why it matters: Proteostasis depends on coordinated chaperones and degradation, but how ubiquitin E3 ligases integrate into this network under stress is not well defined.
• What they did: Using quantitative proteomics in melanoma cells treated with mild HSP90-induced folding stress and proteasome inhibition, the study tested TRIP12 depletion and compared protein changes with mRNA levels.
• The result: TRIP12 depletion increased a distinct set of epigenetic/transcriptional regulators and reduced many proteostasis-network proteins largely without mRNA shifts; HSP90 inhibition acted additively to further destabilize the proteome.

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