8G7O

ATP- and mtHsp10-bound mtHsp60 V72I focus


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Asymmetric apical domain states of mitochondrial Hsp60 coordinate substrate engagement and chaperonin assembly.

Braxton, J.R.Shao, H.Tse, E.Gestwicki, J.E.Southworth, D.R.

(2023) bioRxiv 

  • DOI: https://doi.org/10.1101/2023.05.15.540872
  • Primary Citation of Related Structures:  
    8G7J, 8G7K, 8G7L, 8G7M, 8G7N, 8G7O

  • PubMed Abstract: 

    The mitochondrial chaperonin, mtHsp60, promotes the folding of newly imported and transiently misfolded proteins in the mitochondrial matrix, assisted by its co-chaperone mtHsp10. Despite its essential role in mitochondrial proteostasis, structural insights into how this chaperonin binds to clients and progresses through its ATP-dependent reaction cycle are not clear. Here, we determined cryo-electron microscopy (cryo-EM) structures of a hyperstable disease-associated mtHsp60 mutant, V72I, at three stages in this cycle. Unexpectedly, client density is identified in all states, revealing interactions with mtHsp60's apical domains and C-termini that coordinate client positioning in the folding chamber. We further identify a striking asymmetric arrangement of the apical domains in the ATP state, in which an alternating up/down configuration positions interaction surfaces for simultaneous recruitment of mtHsp10 and client retention. Client is then fully encapsulated in mtHsp60/mtHsp10, revealing prominent contacts at two discrete sites that potentially support maturation. These results identify a new role for the apical domains in coordinating client capture and progression through the cycle, and suggest a conserved mechanism of group I chaperonin function.


  • Organizational Affiliation

    Graduate Program in Chemistry and Chemical Biology; University of California, San Francisco; San Francisco, CA 94158, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
60 kDa heat shock protein, mitochondrial
A, B, C, D, E
A, B, C, D, E, F, G
527Homo sapiensMutation(s): 1 
Gene Names: HSPD1HSP60
EC: 5.6.1.7
UniProt & NIH Common Fund Data Resources
Find proteins for P10809 (Homo sapiens)
Explore P10809 
Go to UniProtKB:  P10809
PHAROS:  P10809
GTEx:  ENSG00000144381 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10809
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
10 kDa heat shock protein, mitochondrial
H, I, J, K, L
H, I, J, K, L, M, N
100Homo sapiensMutation(s): 0 
Gene Names: HSPE1
UniProt & NIH Common Fund Data Resources
Find proteins for P61604 (Homo sapiens)
Explore P61604 
Go to UniProtKB:  P61604
PHAROS:  P61604
GTEx:  ENSG00000115541 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61604
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-07-12
    Type: Initial release
  • Version 1.1: 2024-06-19
    Changes: Data collection