Dynamic Cellular Regulation of Proteasome Translocation and Phase Transition

Area of Science:

• Cellular Biology
• Molecular Biology
• Biochemistry

Background:

• Proteasome dysfunction is linked to human diseases, making the proteasome system a key therapeutic target, especially in cancer.
• Proteasome localization dynamics, in addition to activity, regulate protein homeostasis and cellular function.
• Proteasomes dynamically shift between cellular compartments, particularly in response to metabolic cues and stress.

Purpose of the Study:

• To review how metabolic cues regulate proteasome fates, including subcellular translocation, autophagic degradation, and condensate formation.
• To highlight the spatiotemporal regulation of proteasomes in response to distinct metabolic stresses.
• To underscore the potential of understanding proteasome dynamics for identifying novel therapeutic targets.

Main Methods:

• Literature review focusing on studies investigating proteasome localization and function under metabolic stress.
• Analysis of research linking metabolic cues (carbon starvation, amino acid deficiency, senescence) to proteasome dynamics.
• Synthesis of findings on proteasome subcellular translocation, autophagy-mediated degradation, and proteasome condensate formation.

Main Results:

• Metabolic cues significantly influence proteasome localization, leading to translocation, autophagic degradation, or formation of proteasome condensates.
• Proteasome condensates, while not fully understood, may offer proteolytic control essential for cellular survival under metabolic stress.
• Distinct metabolic conditions trigger specific proteasome responses, demonstrating a spatiotemporal regulatory mechanism.

Conclusions:

• Understanding the dynamic regulation of proteasomes in response to metabolic stress is crucial for comprehending cellular protein homeostasis.
• Proteasome localization shifts and condensate formation represent adaptive strategies for cell survival under adverse metabolic conditions.
• Targeting proteasome spatiotemporal regulation offers promising avenues for developing therapies for diseases associated with proteasome dysfunction.