9BLT | pdb_00009blt

Structure of the human mitochondrial Hsp70 (mortalin; R126W mutant) bound to nucleotide exchange factor GrpEL1 (Y173A mutant)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.38 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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This is version 1.0 of the entry. See complete history


Literature

Structural insights into GrpEL1-mediated nucleotide and substrate release of human mitochondrial Hsp70.

Morizono, M.A.McGuire, K.L.Birouty, N.I.Herzik Jr., M.A.

(2024) Nat Commun 15: 10815-10815

  • DOI: https://doi.org/10.1038/s41467-024-54499-1
  • Primary Citation of Related Structures:  
    9BLS, 9BLT, 9BLU

  • PubMed Abstract: 

    Maintenance of protein homeostasis is necessary for cell viability and depends on a complex network of chaperones and co-chaperones, including the heat-shock protein 70 (Hsp70) system. In human mitochondria, mitochondrial Hsp70 (mortalin) and the nucleotide exchange factor (GrpEL1) work synergistically to stabilize proteins, assemble protein complexes, and facilitate protein import. However, our understanding of the molecular mechanisms guiding these processes is hampered by limited structural information. To elucidate these mechanistic details, we used cryoEM to determine structures of full-length human mortalin-GrpEL1 complexes in previously unobserved states. Our structures and molecular dynamics simulations allow us to delineate specific roles for mortalin-GrpEL1 interfaces and to identify steps in GrpEL1-mediated nucleotide and substrate release by mortalin. Subsequent analyses reveal conserved mechanisms across bacteria and mammals and facilitate a complete understanding of sequential nucleotide and substrate release for the Hsp70 chaperone system.


  • Organizational Affiliation
    • Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Stress-70 protein, mitochondrial594Homo sapiensMutation(s): 1 
Gene Names: HSPA9GRP75HSPA9Bmt-HSP70
EC: 3.6.4.10
UniProt & NIH Common Fund Data Resources
Find proteins for P38646 (Homo sapiens)
Explore P38646 
Go to UniProtKB:  P38646
PHAROS:  P38646
GTEx:  ENSG00000113013 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38646
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
GrpE protein homolog 1, mitochondrial
B, C
161Homo sapiensMutation(s): 1 
Gene Names: GRPEL1GREPEL1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HAV7 (Homo sapiens)
Explore Q9HAV7 
Go to UniProtKB:  Q9HAV7
PHAROS:  Q9HAV7
GTEx:  ENSG00000109519 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HAV7
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Substrate peptide7Homo sapiensMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.38 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC4.3.1
MODEL REFINEMENTPHENIX1.21

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R35GM138206-04
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5T32GM139795-03

Revision History  (Full details and data files)

  • Version 1.0: 2025-01-15
    Type: Initial release