5Z8Q

Solution structure of the SBDalpha domain of yeast Ssa1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The C-terminal GGAP motif of Hsp70 mediates substrate recognition and stress response in yeast.

Gong, W.Hu, W.Xu, L.Wu, H.Wu, S.Zhang, H.Wang, J.Jones, G.W.Perrett, S.

(2018) J. Biol. Chem. 293: 17663-17675

  • DOI: 10.1074/jbc.RA118.002691
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The allosteric coupling of the highly conserved nucleotide- and substrate-binding domains of Hsp70 has been studied intensively. In contrast, the role of the disordered, highly variable C-terminal region of Hsp70 remains unclear. In many eukaryotic H ...

    The allosteric coupling of the highly conserved nucleotide- and substrate-binding domains of Hsp70 has been studied intensively. In contrast, the role of the disordered, highly variable C-terminal region of Hsp70 remains unclear. In many eukaryotic Hsp70s, the extreme C-terminal EEVD motif binds to the tetratricopeptide-repeat domains of Hsp70 co-chaperones. Here, we discovered that the TVEEVD sequence of Saccharomyces cerevisiae cytoplasmic Hsp70 (Ssa1) functions as a SUMO-interacting motif. A second C-terminal motif of ∼15 amino acids between the α-helical lid and the extreme C terminus, previously identified in bacterial and eukaryotic organellar Hsp70s, is known to enhance chaperone function by transiently interacting with folding clients. Using structural analysis, interaction studies, fibril formation assays, and in vivo functional assays, we investigated the individual contributions of the α-helical bundle and the C-terminal disordered region of Ssa1 in the inhibition of fibril formation of the prion protein Ure2. Our results revealed that although the α-helical bundle of the Ssa1 substrate-binding domain (SBDα) does not directly bind to Ure2, the SBDα enhances the ability of Hsp70 to inhibit fibril formation. We found that a 20-residue C-terminal motif in Ssa1, containing GGAP and GGAP-like tetrapeptide repeats, can directly bind to Ure2, the Hsp40 co-chaperone Ydj1, and α-synuclein, but not to the SUMO-like protein SMT3 or BSA. Deletion or substitution of the Ssa1 GGAP motif impaired yeast cell tolerance to temperature and cell-wall damage stress. This study highlights that the C-terminal GGAP motif of Hsp70 is important for substrate recognition and mediation of the heat shock response.


    Organizational Affiliation

    the University of the Chinese Academy of Sciences, Beijing 100049, China, and.,From the National Laboratory of Biomacromolecules, Chinese Academy of Sciences Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.,the Department of Biology, Maynooth University, Maynooth, W23 W6R7, Kildare, Ireland.,the Department of Biology, Maynooth University, Maynooth, W23 W6R7, Kildare, Ireland Gary.Jones@leedsbeckett.ac.uk.,From the National Laboratory of Biomacromolecules, Chinese Academy of Sciences Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China, sarah.perrett@cantab.net.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat shock protein SSA1
A
101Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SSA1
Find proteins for P10591 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P10591
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
the National Key R&D Program of ChinaChina2017YFA0504000
the National Natural Science Foundation of ChinaChina31570780
the National Natural Science Foundation of ChinaChina31200578
the National Natural Science Foundation of ChinaChina31470747
the National Natural Science Foundation of ChinaChina31770829
the National Natural Science Foundation of ChinaChina31300631
the National Natural Science Foundation of ChinaChina21673278
the Beijing Natural Science FoundationChina5172026

Revision History 

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2018-10-10
    Type: Data collection, Database references, Structure summary
  • Version 1.2: 2018-11-28
    Type: Data collection, Database references, Structure summary