1KY9 image
Deposition Date 2002-02-04
Release Date 2002-04-03
Last Version Date 2024-11-13
Entry Detail
PDB ID:
1KY9
Keywords:
Title:
Crystal Structure of DegP (HtrA)
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.80 Å
R-Value Free:
0.27
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 63 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PROTEASE DO
Gene (Uniprot):degP
Mutations:S210A
Chain IDs:A, B
Chain Length:448
Number of Molecules:2
Biological Source:Escherichia coli
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Crystal structure of DegP (HtrA) reveals a new protease-chaperone machine.
Nature 416 455 459 (2002)
PMID: 11919638 DOI: 10.1038/416455a

Abstact

Molecular chaperones and proteases monitor the folded state of other proteins. In addition to recognizing non-native conformations, these quality control factors distinguish substrates that can be refolded from those that need to be degraded. To investigate the molecular basis of this process, we have solved the crystal structure of DegP (also known as HtrA), a widely conserved heat shock protein that combines refolding and proteolytic activities. The DegP hexamer is formed by staggered association of trimeric rings. The proteolytic sites are located in a central cavity that is only accessible laterally. The mobile side-walls are constructed by twelve PDZ domains, which mediate the opening and closing of the particle and probably the initial binding of substrate. The inner cavity is lined by several hydrophobic patches that may act as docking sites for unfolded polypeptides. In the chaperone conformation, the protease domain of DegP exists in an inactive state, in which substrate binding in addition to catalysis is abolished.

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