9NVC | pdb_00009nvc

mjHSP16.5 24mer (+lysozyme, 75C)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanism of small heat shock protein client sequestration and induced polydispersity.

Miller, A.P.Reichow, S.L.

(2025) Nat Commun 16: 3635-3635

  • DOI: https://doi.org/10.1038/s41467-025-58964-3
  • Primary Citation of Related Structures:  
    9NV4, 9NV7, 9NV8, 9NVC, 9NVF, 9NVI, 9NVJ, 9NVK

  • PubMed Abstract: 

    Small heat shock proteins (sHSPs) act as first responders during cellular stress, sequestering destabilized proteins (clients) to prevent aggregation and facilitate refolding or degradation. This critical function, conserved across all life, is linked to proteostasis and protein misfolding diseases. However, the extreme molecular plasticity of sHSP/client complexes has limited mechanistic understanding. Here, we present high-resolution cryo-EM structures of Methanocaldococcus jannaschii sHSP (mjHSP16.5) in apo and multiple client-bound states. The ensemble reveals molecular mechanisms of client sequestration, highlighting cooperative chaperone-client interactions. Client engagement polarizes scaffold stability, promoting higher-order assembly and enhanced sequestration. Higher-order states suggest multiple sHSP/client assembly pathways, including subunit insertion at destabilized geometrical features. These findings provide critical insights into sHSP chaperone function and the interplay between polydispersity and client handling under stress.


  • Organizational Affiliation
    • Department of Chemical Physiology and Biochemistry, Oregon Health and Science University, Portland, OR, 97239, USA.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Small heat shock protein HSP16.5147Methanocaldococcus jannaschiiMutation(s): 0 
Gene Names: MJ0285
UniProt
Find proteins for Q57733 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Explore Q57733 
Go to UniProtKB:  Q57733
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ57733
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.20.1_4487

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Eye Institute (NIH/NEI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2025-04-16
    Type: Initial release
  • Version 1.1: 2025-04-30
    Changes: Data collection, Database references
  • Version 1.2: 2025-05-07
    Changes: Data collection