ISDA

Deposition Date 2011-11-20

Release Date 2011-12-28

Last Version Date 2024-05-08

Entry Detail

PDB ID:

4A8A

Keywords:

HYDROLASE/HYDROLASE

Title:

Asymmetric cryo-EM reconstruction of E. coli DegQ 12-mer in complex with lysozyme

Biological Source:

Source Organism:

ESCHERICHIA COLI (Taxon ID: 83333)
GALLUS GALLUS (Taxon ID: 9031)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

14.20 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:PERIPLASMIC PH-DEPENDENT SERINE ENDOPROTEASE DEGQ
Gene (Uniprot):degQ
Mutations:YES
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L
Chain Length:436
Number of Molecules:12
Biological Source:ESCHERICHIA COLI

UniProt ID:P39099 Pfam ID:PF13365, PF00595 EC:3.4.21.107

Protein Blast

Polymer Type:polypeptide(L)
Molecule:LYSOZYME C
Gene (Uniprot):LYZ
Chain IDs:M
Chain Length:129
Number of Molecules:1
Biological Source:GALLUS GALLUS

UniProt ID:P00698 Pfam ID:PF00062 EC:3.2.1.17

Ligand Molecules

Primary Citation

Newly Folded Substrates Inside the Molecular Cage of the Htra Chaperone Degq

Malet, H, Canellas, F, Sawa, J, Yan, J, Thalassinos, K, Ehrmann, M, Clausen, T, Saibil, H.R.Show

Nat.Struct.Mol.Biol. 19 152 ? (2012)

PMID: 22245966 DOI: 10.1038/NSMB.2210

Abstact

The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA proteins are well characterized, their chaperone activity remains poorly understood. Here we describe cryo-EM structures of Escherichia coli DegQ in its 12- and 24-mer states in complex with model substrates, providing a structural model of HtrA chaperone action. Up to six lysozyme substrates bind inside the DegQ 12-mer cage and are visualized in a close-to-native state. An asymmetric reconstruction reveals the binding of a well-ordered lysozyme to four DegQ protomers. DegQ PDZ domains are located adjacent to substrate density and their presence is required for chaperone activity. The substrate-interacting regions appear conserved in 12- and 24-mer cages, suggesting a common mechanism of chaperone function.

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Primary Citation of related structures