Ubiquilin-4 - Q99NB8 (UBQL4_MOUSE)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

 
Function
Plays a role in the regulation of protein degradation via the ubiquitin-proteasome system (UPS). 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 (By similarity). Plays a role in the regulation of the proteasomal degradation of non-ubiquitinated GJA1 (PubMed:18079109, PubMed:20940304). Acts as an adapter protein that recruits UBQLN1 to the autophagy machinery. Mediates the association of UBQLN1 with autophagosomes and the autophagy-related protein LC3 (MAP1LC3A/B/C) and may assist in the maturation of autophagosomes to autolysosomes by mediating autophagosome-lysosome fusion. UniProt
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Subunit Structure
Homooligomer. Binds ATXN1/SCA1. Interaction with ATXN1 inhibits polyubiquitination of UBQLN4 and interferes with PSMD4 binding (By similarity). Interacts (via ubiquitin-like domain) with PSMD2 and PSMD4, regulatory subunits of the proteasome (PubMed:18079109). Binds signal sequences of proteins that are targeted to the endoplasmic reticulum (PubMed:11162551). Interacts (via UBA domain) with GJA1 (not ubiquitinated) and with ubiquitin; both compete for the same binding site (PubMed:18079109, PubMed:20940304, PubMed:20127391). Interacts (via UBA domain) with polyubiquitin chains and polyubiquitinated proteins (PubMed:20940304). Interacts with HERPUD1. Interacts (via ubiquitin-like domain) with UBQLN1 (via UBA domain). Interacts (via STI1 1 and 2 domains) with MAP1LC3A/B/C. Interacts with UBQLN2. UniProt
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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 Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  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.
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Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
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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