Protein quality control machinery: regulators of condensate architecture and functionality

Area of Science:

• Cellular Biology
• Biochemistry
• Molecular Biology

Background:

• Protein quality control (PQC) maintains cellular proteostasis via systems like the ubiquitin-proteasome system (UPS) and autophagy.
• Biomolecular condensates are increasingly recognized as regulators of cellular processes, including PQC.
• PQC machinery influences the dynamics and properties of these condensates.

Purpose of the Study:

• To explore the interplay between PQC mechanisms and biomolecular condensates.
• To elucidate the molecular basis of PQC machinery forming or being recruited to condensates.
• To highlight the regulatory roles and therapeutic implications of this interplay.

Main Methods:

• Literature review and synthesis of recent findings.
• Molecular analysis of polyubiquitin chains and Ub-binding proteins.
• Discussion of PQC machinery's role in condensate assembly and regulation.

Main Results:

• PQC components can form de novo condensates or join existing ones.
• Polyubiquitin chains and adaptor proteins are key drivers of condensate formation.
• Condensate formation by PQC machinery impacts downstream PQC outcomes.

Conclusions:

• The PQC machinery actively participates in the formation and regulation of biomolecular condensates.
• This dynamic interplay is crucial for maintaining protein homeostasis under various conditions.
• Targeting PQC-mediated condensates presents a promising therapeutic avenue.