| Post Translational Modifications | Palmitoylation of the RING-type zing finger by ZDHHC6 promotes localization to the peripheral endoplasmic reticulum. |
| Function | E3 ubiquitin-protein ligase that mediates the polyubiquitination of lysine and cysteine residues on target proteins, such as CD3D, CYP3A4, CFTR, INSIG1, SOAT2/ACAT2 and APOB for proteasomal degradation. Component of a VCP/p97-AMFR/gp78 complex that participates in the final step of endoplasmic reticulum-associated degradation (ERAD). The VCP/p97-AMFR/gp78 complex is involved in the sterol-accelerated ERAD degradation of HMGCR through binding to the HMGCR-INSIG1 complex at the ER membrane. In addition, interaction of AMFR with AUP1 facilitates interaction of AMFR with ubiquitin-conjugating enzyme UBE2G2 and ubiquitin ligase RNF139, leading to sterol-induced HMGCR ubiquitination. The ubiquitinated HMGCR is then released from the ER into the cytosol for subsequent destruction. In addition to ubiquitination on lysine residues, catalyzes ubiquitination on cysteine residues: together with INSIG1, mediates polyubiquitination of SOAT2/ACAT2 at 'Cys-277', leading to its degradation when the lipid levels are low. Catalyzes ubiquitination and subsequent degradation of INSIG1 when cells are depleted of sterols. Mediates polyubiquitination of INSIG2 at 'Cys-215' in some tissues, leading to its degradation. Also regulates ERAD through the ubiquitination of UBL4A a component of the BAG6/BAT3 complex. Also acts as a scaffold protein to assemble a complex that couples ubiquitination, retranslocation and deglycosylation. Mediates tumor invasion and metastasis as a receptor for the GPI/autocrine motility factor. In association with LMBR1L and UBAC2, negatively regulates the canonical Wnt signaling pathway in the lymphocytes by promoting the ubiquitin-mediated degradation of CTNNB1 and Wnt receptors FZD6 and LRP6. Regulates NF-kappa-B and MAPK signaling pathways by mediating 'Lys-27'-linked polyubiquitination of TAB3 and promoting subsequent TAK1/MAP3K7 activation. Required for proper lipid homeostasis. |
| Protein Name | E3 Ubiquitin-Protein Ligase AmfrAutocrine Motility Factor ReceptorAmf ReceptorRing Finger Protein 45Gp78 |
| Database Links | Reactome: R-HSA-532668Reactome: R-HSA-901032 |
| Cellular Localisation | Endoplasmic Reticulum MembraneMulti-Pass Membrane ProteinPalmitoylation Promotes Localization To The Peripheral Endoplasmic Reticulum |
| Alternative Protein Names | E3 Ubiquitin-Protein Ligase Amfr proteinAutocrine Motility Factor Receptor proteinAmf Receptor proteinRing Finger Protein 45 proteinGp78 proteinAMFR proteinRNF45 protein |
Information sourced from Uniprot.org
