7A4U

Crystal structure of lid-truncated apo BiP in an oligomeric state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Calcium depletion challenges endoplasmic reticulum proteostasis by destabilising BiP-substrate complexes.

Preissler, S.Rato, C.Yan, Y.Perera, L.A.Czako, A.Ron, D.

(2020) Elife 9

  • DOI: https://doi.org/10.7554/eLife.62601
  • Primary Citation of Related Structures:  
    6ZYH, 6ZYI, 6ZYJ, 7A4U, 7A4V

  • PubMed Abstract: 

    The metazoan endoplasmic reticulum (ER) serves both as a hub for maturation of secreted proteins and as an intracellular calcium storage compartment, facilitating calcium-release-dependent cellular processes. ER calcium depletion robustly activates the unfolded protein response (UPR). However, it is unclear how fluctuations in ER calcium impact organellar proteostasis. Here, we report that calcium selectively affects the dynamics of the abundant metazoan ER Hsp70 chaperone BiP, by enhancing its affinity for ADP. In the calcium-replete ER, ADP rebinding to post-ATP hydrolysis BiP-substrate complexes competes with ATP binding during both spontaneous and co-chaperone-assisted nucleotide exchange, favouring substrate retention. Conversely, in the calcium-depleted ER, relative acceleration of ADP-to-ATP exchange favours substrate release. These findings explain the rapid dissociation of certain substrates from BiP observed in the calcium-depleted ER and suggest a mechanism for tuning ER quality control and coupling UPR activity to signals that mobilise ER calcium in secretory cells.


  • Organizational Affiliation

    Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endoplasmic reticulum chaperone BiP523Cricetulus griseusMutation(s): 2 
Gene Names: HSPA5GRP78I79_019946
EC: 3.6.4.10
UniProt
Find proteins for G3I8R9 (Cricetulus griseus)
Explore G3I8R9 
Go to UniProtKB:  G3I8R9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG3I8R9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.333α = 90
b = 51.289β = 100.17
c = 119.716γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
DIALSdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom200848/Z/16/Z

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-16
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Database references, Refinement description