9C0C image
Deposition Date 2024-05-25
Release Date 2024-08-07
Last Version Date 2024-08-14
Entry Detail
PDB ID:
9C0C
Keywords:
Title:
E.coli GroEL apoenzyme
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.41 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:60 kDa chaperonin
Gene (Uniprot):groL
Chain IDs:A, B (auth: N), C (auth: B), D (auth: H), E (auth: C), F (auth: I), G (auth: D), H (auth: J), I (auth: E), J (auth: K), K (auth: F), L, M (auth: G), N (auth: M)
Chain Length:548
Number of Molecules:14
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Bis-sulfonamido-2-phenylbenzoxazoles Validate the GroES/EL Chaperone System as a Viable Antibiotic Target.
J.Am.Chem.Soc. 146 20845 20856 (2024)
PMID: 39041457 DOI: 10.1021/jacs.4c05057

Abstact

We recently reported on small-molecule inhibitors of the GroES/GroEL chaperone system as potential antibiotics against Escherichia coli and the ESKAPE pathogens but were unable to establish GroES/GroEL as the cellular target, leading to cell death. In this study, using two of our most potent bis-sulfonamido-2-phenylbenzoxazoles (PBZs), we established the binding site of the PBZ molecules using cryo-EM and found that GroEL was the cellular target responsible for the mode of action. Cryo-EM revealed that PBZ1587 binds at the GroEL ring-ring interface (RRI). A cellular reporter assay confirmed that PBZ1587 engaged GroEL in cells, but cellular rescue experiments showed potential off-target effects. This prompted us to explore a closely related analogue, PBZ1038, which is also bound to the RRI. Biochemical characterization showed potent inhibition of Gram-negative chaperonins but much lower potency of chaperonin from a Gram-positive organism, Enterococcus faecium. A cellular reporter assay showed that PBZ1038 also engaged GroEL in cells and that the cytotoxic phenotype could be rescued by a chromosomal copy of E. faecium GroEL/GroES or by expressing a recalcitrant RRI mutant. These data argue that PBZ1038's antimicrobial action is exerted through inhibition of GroES/GroEL, validating this chaperone system as an antibiotic target.

Legend

Protein

Chemical

Disease

Primary Citation of related structures