PAC2 Activators

PAC2, a protein encoded by the gene PSMC5, is a component of the 26S proteasome, a multi-enzyme complex responsible for targeted protein degradation in eukaryotic cells. The 26S proteasome is a crucial element of the ubiquitin-proteasome system (UPS), which maintains cellular homeostasis by regulating the concentration of specific proteins and removing misfolded or damaged proteins that could otherwise disrupt cellular function.

PAC2, also known as the proteasome (prosome, macropain) 26S subunit, ATPase 5, is one of the six ATPase subunits within the 19S regulatory particle of the proteasome. This regulatory particle is responsible for recognizing polyubiquitinated protein substrates, unfolding them, and translocating them into the 20S core particle where proteolysis occurs. PAC2, through its ATPase activity, plays a pivotal role in this process by providing the energy necessary for substrate unfolding and translocation.The proper functioning of the UPS, and by extension PAC2, is fundamental to numerous cellular processes, including cell cycle regulation, signal transduction, and stress response. Moreover, the dysregulation of proteasome activity is associated with various diseases, including cancer, neurodegenerative disorders, and autoimmune conditions. As such, PAC2 and its associated proteasome complex are targets for intervention.