Ubiquilin-1 - Q9JJP9 (UBQL1_RAT)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9JJP9: 1
 
Function
Plays an important role in the regulation of different protein degradation mechanisms and pathways including ubiquitin-proteasome system (UPS), autophagy and endoplasmic reticulum-associated protein degradation (ERAD) pathway. Mediates the proteasomal targeting of misfolded or accumulated proteins for degradation by binding (via UBA domain) to their polyubiquitin chains and by interacting (via ubiquitin-like domain) with the subunits of the proteasome. Plays a role in the ERAD pathway via its interaction with ER-localized proteins UBXN4, VCP and HERPUD1 and may form a link between the polyubiquitinated ERAD substrates and the proteasome. Plays a role in unfolded protein response (UPR) by attenuating the induction of UPR-inducible genes, DDTI3/CHOP, HSPA5 and PDIA2 during ER stress. Involved in the regulation of macroautophagy and autophagosome formation; required for maturation of autophagy-related protein LC3 from the cytosolic form LC3-I to the membrane-bound form LC3-II and may assist in the maturation of autophagosomes to autolysosomes by mediating autophagosome-lysosome fusion. Negatively regulates the TICAM1/TRIF-dependent toll-like receptor signaling pathway by decreasing the abundance of TICAM1 via the autophagic pathway. Plays a key role in the regulation of the levels of PSEN1 by targeting its accumulation to aggresomes which may then be removed from cells by autophagocytosis. Promotes the ubiquitination and lysosomal degradation of ORAI1, consequently downregulating the ORAI1-mediated Ca2+ mobilization (By similarity). Suppresses the maturation and proteasomal degradation of amyloid beta A4 protein (A4) by stimulating the lysine 63 (K63)-linked polyubiquitination. Delays the maturation of A4 by sequestering it in the Golgi apparatus and preventing its transport to the cell surface for subsequent processing (PubMed:22847417). Promotes the surface expression of GABA-A receptors (PubMed:11528422). UniProt
Pathway Maps
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Subunit Structure
Monomer and homodimer. Heterodimer with UBQLN2. Binds CD47 (By similarity). Binds NBL1 (PubMed:9303440). Binds GABRA1, GABRA2, GABRA3, GABRA6, GABRB1, GABRB2 and GABRB3 (PubMed:11528422). Binds UBE3A, BTRC, P4HB and MTOR. Interacts with the proteasome 19S subunit. Interacts (via ubiquitin-like domain) with TREX1; the interaction is direct and may control TREX1 subcellular location. Forms a complex with UBXN4 and VCP. Interacts (via UBA domain) with UBQLN4 (via ubiquitin-like domain). Found in a complex with UBQLN2 and MAP1LC3A/B/C. The monomeric form interacts with PSEN1 and PSEN2. Interacts with ORAI1. Interacts (via UBA domain) with TICAM1. Interacts with EPS15. Interacts (via UBA domain) with UBA52 and (via ubiquitin-like domain) with PSMD3 and PSMD4. Interacts with HERPUD1. Interacts with MAP1LC3A/B/C in the presence of UBQLN4. Interacts (via ubiquitin-like domain) with EPS15 (via UIM domains) and both the ubiquitinated and non-ubiquitinated forms can interact with EPS15. Interacts (via ubiquitin-like domain) with EPS15L1, HGS (via UIM domain) and STAM2 (via UIM domain). UniProt
Domain
Dimerization is dependent upon the central region of the protein containing the STI1 domains and is independent of its ubiquitin-like and UBA domains. UniProt
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Data origin/color codes
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Sequence Mismatches It is now possible to see information about expression tags, cloning artifacts, and many other details related to sequence mismatches.
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Validation Track

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Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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