Ube2K Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Ubiquitin-Conjugating Enzyme E2 K (UBE2K) | |
|---|---|
| Gene | UBE2K |
| UniProt ID | P61006 |
| Molecular Weight | 22 kDa |
| Subcellular Localization | Cytoplasm, nucleus |
| Protein Family | E2 ubiquitin-conjugating enzyme family |
| EC Number | 2.3.2.23 |
| Aliases | E2-25K, HIP2, Ubc13 |
UBE2K (Ubc13/UEV1) is an E2 ubiquitin-conjugating enzyme that catalyzes the formation of K63-linked polyubiquitin chains. Originally identified as HGS-HIP2 (hepatocyte growth factor-regulated tyrosine kinase substrate), UBE2K plays critical roles in DNA repair, signal transduction, protein quality control, and inflammatory responses[1][2]. Unlike classical E2 enzymes that generate K48-linked chains for proteasomal degradation, UBE2K specifically produces K63-linked chains that serve non-degradative signaling functions.
UBE2K contains several distinct structural features:
The three-dimensional structure reveals a characteristic α/β fold common to E2 enzymes, with a central β-sheet surrounded by α-helices.
UBE2K participates in multiple cellular pathways through its ability to generate K63-linked polyubiquitin chains:
UBE2K works in conjunction with the E3 ligase TRAF6 to catalyze K63-linked polyubiquitin chain formation. This modification does not target proteins for degradation but instead serves as a signaling platform for various cellular processes[3].
UBE2K is involved in the ATM/ATR-mediated DNA damage response pathway. Following genotoxic stress, UBE2K contributes to the activation of NF-κB and downstream anti-apoptotic gene expression.
The enzyme participates in the clearance of misfolded proteins and protein aggregates through the ubiquitin-proteasome system and selective autophagy pathways.
UBE2K-mediated ubiquitination is essential for proper activation of innate immune signaling, including TLR and NLR receptor pathways.
In AD, UBE2K plays a dual role in both promoting and potentially protecting against pathology:
UBE2K represents a potential therapeutic target for neurodegenerative diseases:
| Strategy | Approach | Status |
|---|---|---|
| Small molecule activators | Enhance UBE2K activity to improve protein clearance | Preclinical |
| Gene therapy | Overexpress UBE2K to boost UPS function | Research |
| Modulators | Develop compounds that enhance K63-linked ubiquitination | Early research |
bendless (ubl) is involved in synaptic plasticityThe study of Ube2K Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Wu PY, et al. Ubc13 in signaling and disease. Cell Mol Life Sci. 2006;63(23):2667-2675. PMID:17063477 ↩︎
Hofmann RM, Pickart CM. Ubc13 in ubiquitin chain synthesis. Cell. 2001;105(5):575-585. PMID:11389828 ↩︎
Deng L, et al. Regulation of NF-κB signaling by Lys63-linked ubiquitination. Cell Res. 2010;20(9):1003-1021. PMID:20729854 ↩︎
El Ayadi A, et al. Ubiquitin-conjugating enzymes in neurodegeneration. Biochim Biophys Acta. 2019;1866(4):713-731. PMID:30685457 ↩︎