USP45 Activators

The chemical class termed USP45 Activators includes compounds that influence the cellular proteostasis network, mainly through the induction of proteotoxic stress or inhibition of protein degradation pathways, which can subsequently affect USP45 activity. These chemicals are not direct activators but operate by altering the cellular environment to potentially increase the functional demand for USP45's deubiquitinating activity.

For instance, proteasome inhibitors such as MG132, Bortezomib, and Epoxomicin increase the level of ubiquitinated proteins within the cell. This accumulation can create a need for enhanced deubiquitinating activity to restore protein homeostasis, potentially leading to an increased requirement for enzymes like USP45. These compounds achieve this by blocking the proteasome's ability to degrade polyubiquitinated proteins, which in turn could signal the cell to upregulate DUBs to remove the excess ubiquitin from proteins slated for degradation. Moreover, molecules that induce cellular stress responses, like Betulinic acid, Withaferin A, Tunicamycin, Thapsigargin, Disulfiram, 17-AAG, Celastrol, and Salubrinal, can also affect USP45 indirectly. They exert their influence by triggering the unfolded protein response or heat shock response, which may lead to an upregulation of various components of the protein quality control machinery, including DUBs such as USP45.