DnaJ homolog subfamily B member 9 - Q9UBS3 (DNJB9_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9UBS3: 1
 
Function
Co-chaperone for Hsp70 protein HSPA5/BiP that acts as a key repressor of the ERN1/IRE1-mediated unfolded protein response (UPR) (By similarity). J domain-containing co-chaperones stimulate the ATPase activity of Hsp70 proteins and are required for efficient substrate recognition by Hsp70 proteins (PubMed:18400946). In the unstressed endoplasmic reticulum, interacts with the luminal region of ERN1/IRE1 and selectively recruits HSPA5/BiP: HSPA5/BiP disrupts the dimerization of the active ERN1/IRE1 luminal region, thereby inactivating ERN1/IRE1 (By similarity). Also involved in endoplasmic reticulum-associated degradation (ERAD) of misfolded proteins. Required for survival of B-cell progenitors and normal antibody production. UniProt
Pathway Maps
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Subunit Structure
Interacts with HSPA5/BiP; interaction is direct (By similarity). Interacts with ERN1/IRE1 (via the luminal region) (By similarity). Interacts with DERL1. UniProt
Domain
The J domain stimulates the ATPase activity of HSPA5/BiP, while the divergent targeting domain is required for efficient substrate recognition by HSPA5/BiP. The divergent targeting domain specifically recognizes and binds to aggregation-prone sequences. UniProt
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Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
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  • Red: potentially disorderd region
  • Blue: probably ordered region.
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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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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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