ISDA

Entry Detail

PDB ID:

6PXL

Keywords:

HYDROLASE

Title:

3.74 Angstroms resolution structure of HlsU 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:

3.74 Å

R-Value Free:

0.26

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

C 1 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:ATP-dependent protease ATPase subunit HslU
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L
Chain Length:448
Number of Molecules:12
Biological Source:Escherichia coli

UniProt ID:P0A6H5 Pfam ID:PF00004, PF07724 EC:3.4.25.2

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.

Baytshtok, V, Fei, X, Shih, T.T, Grant, R.A, Santos, J.C, Baker, T.A, Sauer, R.T.Show

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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Protein

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Disease

Primary Citation of related structures