3CQX

Chaperone Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis of nucleotide exchange and client binding by the Hsp70 cochaperone Bag2

Xu, Z.Page, R.C.Gomes, M.M.Kohli, E.Nix, J.C.Herr, A.B.Patterson, C.Misra, S.

(2008) Nat Struct Mol Biol 15: 1309-1317

  • DOI: 10.1038/nsmb.1518
  • Primary Citation of Related Structures:  
    3CQX, 3D0T

  • PubMed Abstract: 
  • Cochaperones are essential for Hsp70- and Hsc70-mediated folding of proteins and include nucleotide-exchange factors (NEFs) that assist protein folding by accelerating ADP-ATP exchange on Hsp70. The cochaperone Bag2 binds misfolded Hsp70 clients and also acts as an NEF, but the molecular basis for its function is unclear ...

    Cochaperones are essential for Hsp70- and Hsc70-mediated folding of proteins and include nucleotide-exchange factors (NEFs) that assist protein folding by accelerating ADP-ATP exchange on Hsp70. The cochaperone Bag2 binds misfolded Hsp70 clients and also acts as an NEF, but the molecular basis for its function is unclear. We show that, rather than being a member of the Bag domain family, Bag2 contains a new type of Hsp70 NEF domain, which we call the 'brand new bag' (BNB) domain. Free and Hsc70-bound crystal structures of Bag2-BNB show its dimeric structure, in which a flanking linker helix and loop bind to Hsc70 to promote nucleotide exchange. NMR analysis demonstrates that the client binding sites and Hsc70-interaction sites of the Bag2-BNB overlap, and that Hsc70 can displace clients from Bag2-BNB, indicating a distinct mechanism for the regulation of Hsp70-mediated protein folding by Bag2.


    Organizational Affiliation

    Department of Molecular Cardiology, Lerner Research Institute, NB50, 9500 Euclid Avenue, The Cleveland Clinic, Cleveland, Ohio 44195, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Heat shock cognate 71 kDa proteinA, B386Mus musculusMutation(s): 0 
Gene Names: Hspa8Hsc70Hsc73
UniProt
Find proteins for P63017 (Mus musculus)
Explore P63017 
Go to UniProtKB:  P63017
Entity Groups  
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UniProt GroupP63017
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BAG family molecular chaperone regulator 2C, D88Mus musculusMutation(s): 0 
Gene Names: Bag2
UniProt & NIH Common Fund Data Resources
Find proteins for Q91YN9 (Mus musculus)
Explore Q91YN9 
Go to UniProtKB:  Q91YN9
IMPC:  MGI:1891254
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ91YN9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.846α = 90
b = 105.808β = 90
c = 210.683γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
PHASERphasing
CNSrefinement
PDB_EXTRACTdata extraction
d*TREKdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance