1HX1 | pdb_00001hx1

CRYSTAL STRUCTURE OF A BAG DOMAIN IN COMPLEX WITH THE HSC70 ATPASE DOMAIN

• PDB DOI: https://doi.org/10.2210/pdb1HX1/pdb

• Classification: CHAPERONE/CHAPERONE INHIBITOR
• Organism(s): Bos taurus, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2001-01-11 Released: 2001-03-07 
• Deposition Author(s): Sondermann, H., Scheufler, C., Moarefi, I.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 
  0.279 (Depositor), 0.278 (DCC) 
• R-Value Work: 
  0.234 (Depositor), 0.234 (DCC) 

Literature

Structure of a Bag/Hsc70 complex: convergent functional evolution of Hsp70 nucleotide exchange factors.

Sondermann, H., Scheufler, C., Schneider, C., Hohfeld, J., Hartl, F.U., Moarefi, I.

(2001) Science 291: 1553-1557

• PubMed: 11222862 
• DOI: https://doi.org/10.1126/science.1057268
• Primary Citation Related Structures: 
  1HX1


• PubMed Abstract: 
  

  Bag (Bcl2-associated athanogene) domains occur in a class of cofactors of the eukaryotic chaperone 70-kilodalton heat shock protein (Hsp70) family. Binding of the Bag domain to the Hsp70 adenosine triphosphatase (ATPase) domain promotes adenosine 5'-triphosphate-dependent release of substrate from Hsp70 in vitro. In a 1.9 angstrom crystal structure of a complex with the ATPase of the 70-kilodalton heat shock cognate protein (Hsc70), the Bag domain forms a three-helix bundle, inducing a conformational switch in the ATPase that is incompatible with nucleotide binding. The same switch is observed in the bacterial Hsp70 homolog DnaK upon binding of the structurally unrelated nucleotide exchange factor GrpE. Thus, functional convergence has allowed proteins with different architectures to trigger a conserved conformational shift in Hsp70 that leads to nucleotide exchange.

---

Organizational Affiliation: 
• Department of Cellular Biochemistry, Max-Planck-Institut für Biochemie, D-82152 Martinsried, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 57.79 kDa 
• Atom Count: 4,143 
• Modeled Residue Count: 489 
• Deposited Residue Count: 514 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Heat shock 70 kDa protein 8	A	400	Bos taurus	Mutation(s): 0  Gene Names: HSPA8, HSC70 EC: 3.6.4.10
UniProt
Find proteins for P19120 (Bos taurus) Explore P19120  Go to UniProtKB:  P19120

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
BAG family molecular chaperone regulator 1	B	114	Homo sapiens	Mutation(s): 0  Gene Names: BAG1, HAP
UniProt & NIH Common Fund Data Resources
Find proteins for Q99933 (Homo sapiens) Explore Q99933  Go to UniProtKB:  Q99933
PHAROS:  Q99933 GTEx:  ENSG00000107262

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TRS	C [auth A]	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL C4 H12 N O3 LENZDBCJOHFCAS-UHFFFAOYSA-O

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free:  0.279 (Depositor), 0.278 (DCC) 
• R-Value Work:  0.234 (Depositor), 0.234 (DCC) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 116.57	α = 90
b = 40.78	β = 114.84
c = 129.26	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
DM	model building
CNS	refinement
DM	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-03-07 
Deposition Author(s): Sondermann, H., Scheufler, C., Moarefi, I.

Revision History  

• Version 1.0: 2001-03-07
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2012-06-20
  Changes: Database references, Structure summary
• Version 1.4: 2019-12-18
  Changes: Data collection, Database references
• Version 1.5: 2024-11-13
  Changes: Data collection, Database references, Derived calculations, Structure summary