| UFD1 (Ubiquitin Fusion Degradation Protein 1) | |
|---|---|
| Gene | [UFD1](/genes/ufd1) |
| UniProt ID | [Q92508](https://www.uniprot.org/uniprot/Q92508) |
| PDB | 2PNK, 5C1V |
| Molecular Weight | 36.7 kDa |
| Localization | Nucleus, cytoplasm, ER membrane |
| Family | UFD1 family, VCP/p97 cofactor |
| Disease | ALS, FTD, IBMPFD |
UFD1 (ubiquitin fusion degradation protein 1) is a cofactor for VCP/p97 (valosin-containing protein), forming the UFD1-NPL4 complex that recognizes ubiquitinated substrates for VCP-mediated extraction and processing. The UFD1-NPL4-VCP complex is essential for ER-associated degradation (ERAD), chromatin remodeling, and mitophagy, making it central to protein quality control pathways disrupted in ALS and FTD.
UFD1 contains:
UFD1-NPL4 complex[1]:
UFD1 functions as part of the VCP cofactor system:
VCP-UFD1-NPL4 complex:
VCP mutations cause IBMPFD, with UFD1-NPL4 involvement:
UFD1-NPL4-VCP dysfunction contributes to ALS/FTD[2]:
Evidence for involvement:
ERAD dysfunction in AD:
| Strategy | Mechanism | Status |
|---|---|---|
| VCP activators | Enhance substrate processing | Preclinical |
| Proteasome enhancers | Support degradation | Clinical |
| ER stress reducers | Lower ERAD demand | Clinical trials |
| Nrf2 activators | Boost protein quality control | Clinical |
Meyer et al. Structure of the UFD1-NPL4-VCP complex. Nat Struct Mol Biol. 2004. ↩︎
Meyer and Weihl. VCP in neurodegeneration. J Neurochem. 2020. ↩︎
Chaudhary et al. ERAD in Alzheimer's disease. J Biol Chem. 2016. ↩︎