Crystal structure of the co-translational Hsp70 chaperone Ssb in the ATP-bound, open conformation

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Interaction of the cotranslational Hsp70 Ssb with ribosomal proteins and rRNA depends on its lid domain.

Gumiero, A.Conz, C.Gese, G.V.Zhang, Y.Weyer, F.A.Lapouge, K.Kappes, J.von Plehwe, U.Schermann, G.Fitzke, E.Wolfle, T.Fischer, T.Rospert, S.Sinning, I.

(2016) Nat Commun 7: 13563-13563

  • DOI: https://doi.org/10.1038/ncomms13563
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cotranslational chaperones assist in de novo folding of nascent polypeptides in all organisms. In yeast, the heterodimeric ribosome-associated complex (RAC) forms a unique chaperone triad with the Hsp70 homologue Ssb. We report the X-ray structure of full length Ssb in the ATP-bound open conformation at 2.6 Å resolution and identify a positively charged region in the α-helical lid domain (SBDα), which is present in all members of the Ssb-subfamily of Hsp70s. Mutational analysis demonstrates that this region is strictly required for ribosome binding. Crosslinking shows that Ssb binds close to the tunnel exit via contacts with both, ribosomal proteins and rRNA, and that specific contacts can be correlated with switching between the open (ATP-bound) and closed (ADP-bound) conformation. Taken together, our data reveal how Ssb dynamics on the ribosome allows for the efficient interaction with nascent chains upon RAC-mediated activation of ATP hydrolysis.

  • Organizational Affiliation

    Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, D-79104 Freiburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein
A, B
621Thermochaetoides thermophila DSM 1495Mutation(s): 0 
Gene Names: CTHT_0058460SSB1
Find proteins for G0SCU5 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719))
Explore G0SCU5 
Go to UniProtKB:  G0SCU5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0SCU5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.93α = 90
b = 128.24β = 93.22
c = 79.68γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-16
    Type: Initial release
  • Version 1.1: 2016-12-07
    Changes: Database references