3D0T

Structure of the BNB domain of the Hsp70 cochaperone Bag2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.253 

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

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BAG family molecular chaperone regulator 2
A, B, C, D
88Mus musculusGene Names: Bag2
Find proteins for Q91YN9 (Mus musculus)
Go to UniProtKB:  Q91YN9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.253 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 104.680α = 90.00
b = 104.680β = 90.00
c = 164.300γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
PHENIXphasing
d*TREKdata scaling
d*TREKdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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