E3 ubiquitin-protein ligase (generic; no unique full name for “homolog X”) (E3 (generic); no unique abbreviation for “homolog X”)

E3 ubiquitin ligases are a large family of enzymes that catalyze the covalent attachment of ubiquitin to substrate lysine residues, marking proteins for proteasomal degradation or regulating their activity and localization. Three major subclasses exist based on catalytic mechanism: HECT domain-containing, RING finger domain-containing, and RBR family. E3 ligases control the specificity of substrate recognition in ubiquitination, and play key roles in regulation of protein turnover, signal transduction, cell cycle checkpoints, apoptosis, and immune responses. Many members are implicated in disease processes, including cancer and neurodegeneration, and targeted by novel therapeutic approaches such as PROTACs. However, the designation “E3 ubiquitin-protein ligase homolog X” does not correspond to a precise, druggable protein target or biomarker. If you can provide a specific gene symbol, Uniprot ID, or standardized protein name, more precise targeted information can be retrieved.

Other names

E3 ubiquitin ligaseE3 ligaseHECT domain E3 ligase (if referring to HECT-type family member)RING-type E3 ligase (if referring to RING-type family member)RBR-type E3 ligase (if referring to RBR subfamily)

Targeted protein degradation by PROTACs which recruit E3 ligases. No specific mechanism for "homolog X"; mechanisms depend on family member.