E3 Ubiquitin Ligases: Structures, Biological Functions, Diseases, and Therapy

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• E3 ubiquitin ligases are key regulators of the ubiquitin-proteasome system, crucial for protein degradation and cellular homeostasis.
• Their diverse structures enable precise control over essential cellular processes, including cell cycle, immunity, and signal transduction.
• A comprehensive understanding of E3 ligase roles in disease pathogenesis and therapeutic potential is still developing.

Purpose of the Study:

• To systematically review the classification and mechanisms of major E3 ligase families (RING, HECT, RBR).
• To elaborate on the pathological roles of E3 ligases in major human diseases.
• To synthesize recent therapeutic advances targeting E3 ligases and their machinery.

Main Methods:

• Systematic review of E3 ligase classification and catalytic mechanisms.
• Elaboration of E3 ligase involvement in carcinogenesis, cardiovascular remodeling, autoimmune dysregulation, metabolic syndrome, and neurodegeneration.
• Synthesis of current therapeutic strategies, including small-molecule inhibitors and proteolysis-targeting chimeras (PROTACs).

Main Results:

• Detailed classification and mechanistic insights into RING, HECT, and RBR E3 ligase families.
• Established links between specific E3 ligases and the pathogenesis of diverse diseases.
• Overview of therapeutic modalities, including MDM2 inhibitors and PROTACs, that leverage E3 ligase activity.

Conclusions:

• E3 ligases play a central role in the pathogenesis of numerous human diseases.
• Targeting E3 ligases offers significant therapeutic potential for various conditions.
• This review provides a framework for developing next-generation, mechanism-based therapeutics focused on E3 ligase pathways.