6PXK image
Entry Detail
PDB ID:
6PXK
Keywords:
HYDROLASE
Title:
3.65 Angstroms resolution structure of HslU with an axial-channel plug
Biological Source:
Source Organism:
Escherichia coli
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2019-07-26
Release Date:
2020-07-29
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.65 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 1 2 1
6PXK validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:ATP-dependent protease ATPase subunit HslU
Chain IDs:A (auth: G), B (auth: H), C (auth: I), D (auth: J), E (auth: K), F (auth: L), G (auth: A), H (auth: B), I (auth: C), J (auth: D), K (auth: E), L (auth: F)
Chain Length:448
Number of Molecules:12
Biological Source:Escherichia coli
UniProt ID:P0A6H5 Pfam ID:PF00004, PF07724 EC:3.4.25.2
Polymer Type:polypeptide(L)
Description:unidentified alpha helical sequence
Chain IDs:M (auth: X)
Chain Length:16
Number of Molecules:1
Biological Source:Escherichia coli
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
ADP
SO4
Primary Citation
Heat activates the AAA+ HslUV protease by melting an axial autoinhibitory plug.
Cell Rep 34 108639 108639 (2021)
PMID: 33472065 DOI: 10.1016/j.celrep.2020.108639

Abstact

At low temperatures, protein degradation by the AAA+ HslUV protease is very slow. New crystal structures reveal that residues in the intermediate domain of the HslU6 unfoldase can plug its axial channel, blocking productive substrate binding and subsequent unfolding, translocation, and degradation by the HslV12 peptidase. Biochemical experiments with wild-type and mutant enzymes support a model in which heat-induced melting of this autoinhibitory plug activates HslUV proteolysis.

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Primary Citation of related structures
6PXK