1HX1 image
Deposition Date 2001-01-11
Release Date 2001-03-07
Last Version Date 2024-11-13
Entry Detail
PDB ID:
1HX1
Title:
CRYSTAL STRUCTURE OF A BAG DOMAIN IN COMPLEX WITH THE HSC70 ATPASE DOMAIN
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.27
R-Value Work:
0.23
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Heat shock 70 kDa protein 8
Gene (Uniprot):HSPA8
Chain IDs:A
Chain Length:400
Number of Molecules:1
Biological Source:Bos taurus
Polymer Type:polypeptide(L)
Molecule:BAG family molecular chaperone regulator 1
Gene (Uniprot):BAG1
Chain IDs:B
Chain Length:114
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structure of a Bag/Hsc70 complex: convergent functional evolution of Hsp70 nucleotide exchange factors.
Science 291 1553 1557 (2001)
PMID: 11222862 DOI: 10.1126/science.1057268

Abstact

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.

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Primary Citation of related structures