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- EMDB-45078: E.coli GroEL + PBZ1587 inhibitor -

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Basic information

Entry
Database: EMDB / ID: EMD-45078
TitleE.coli GroEL + PBZ1587 inhibitor
Map data
Sample
  • Complex: E.coli GroEL + PBZ1587 inhibitor
    • Protein or peptide: 60 kDa chaperonin
  • Ligand: N-(2-{4-[4-(aminomethyl)benzene-1-sulfonamido]phenyl}-1,3-benzoxazol-5-yl)-5-chlorothiophene-2-sulfonamide
KeywordsGroEL / Inhibitor / Chaperone
Function / homology
Function and homology information


GroEL-GroES complex / chaperonin ATPase / mitochondrial unfolded protein response / protein import into mitochondrial intermembrane space / chaperone cofactor-dependent protein refolding / positive regulation of interferon-alpha production / isomerase activity / ATP-dependent protein folding chaperone / positive regulation of interleukin-6 production / positive regulation of type II interferon production ...GroEL-GroES complex / chaperonin ATPase / mitochondrial unfolded protein response / protein import into mitochondrial intermembrane space / chaperone cofactor-dependent protein refolding / positive regulation of interferon-alpha production / isomerase activity / ATP-dependent protein folding chaperone / positive regulation of interleukin-6 production / positive regulation of type II interferon production / unfolded protein binding / positive regulation of T cell activation / protein-folding chaperone binding / response to heat / protein refolding / ATP binding / metal ion binding
Similarity search - Function
Chaperonin Cpn60, conserved site / Chaperonins cpn60 signature. / Chaperonin Cpn60/GroEL / GroEL-like equatorial domain superfamily / TCP-1-like chaperonin intermediate domain superfamily / GroEL-like apical domain superfamily / TCP-1/cpn60 chaperonin family / Chaperonin Cpn60/GroEL/TCP-1 family
Similarity search - Domain/homology
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.26 Å
AuthorsWatson ER / Lander GC
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS095892 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)S10OD021634 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM120350 United States
CitationJournal: J Am Chem Soc / Year: 2024
Title: Bis-sulfonamido-2-phenylbenzoxazoles Validate the GroES/EL Chaperone System as a Viable Antibiotic Target.
Authors: Jack Godek / Jared Sivinski / Edmond R Watson / Felicidad Lebario / Wenli Xu / Mckayla Stevens / Christopher J Zerio / Andrew J Ambrose / Xiaoyi Zhu / Carlee A Trindl / Donna D Zhang / ...Authors: Jack Godek / Jared Sivinski / Edmond R Watson / Felicidad Lebario / Wenli Xu / Mckayla Stevens / Christopher J Zerio / Andrew J Ambrose / Xiaoyi Zhu / Carlee A Trindl / Donna D Zhang / Steven M Johnson / Gabriel C Lander / Eli Chapman /
Abstract: We recently reported on small-molecule inhibitors of the GroES/GroEL chaperone system as potential antibiotics against and the ESKAPE pathogens but were unable to establish GroES/GroEL as the ...We recently reported on small-molecule inhibitors of the GroES/GroEL chaperone system as potential antibiotics against 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 -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, . 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 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.
History
DepositionMay 25, 2024-
Header (metadata) releaseAug 7, 2024-
Map releaseAug 7, 2024-
UpdateAug 7, 2024-
Current statusAug 7, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_45078.png

Downloads & links

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Map

FileDownload / File: emd_45078.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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AxesZ (Sec.)Y (Row.)X (Col.)
1.15 Å/pix.
x 256 pix.
= 294.4 Å		1.15 Å/pix.
x 256 pix.
= 294.4 Å		1.15 Å/pix.
x 256 pix.
= 294.4 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.15 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.236
Minimum - Maximum-1.5461197 - 2.7916226
Average (Standard dev.)0.0033708848 (±0.106642075)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 294.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_45078_additional_1.map
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Half map: #2

Fileemd_45078_half_map_1.map
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Half map: #1

Fileemd_45078_half_map_2.map
Projections & Slices
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Sample components

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Entire : E.coli GroEL + PBZ1587 inhibitor

EntireName: E.coli GroEL + PBZ1587 inhibitor
Components
  • Complex: E.coli GroEL + PBZ1587 inhibitor
    • Protein or peptide: 60 kDa chaperonin
  • Ligand: N-(2-{4-[4-(aminomethyl)benzene-1-sulfonamido]phenyl}-1,3-benzoxazol-5-yl)-5-chlorothiophene-2-sulfonamide

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Supramolecule #1: E.coli GroEL + PBZ1587 inhibitor

SupramoleculeName: E.coli GroEL + PBZ1587 inhibitor / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: 60 kDa chaperonin

MacromoleculeName: 60 kDa chaperonin / type: protein_or_peptide / ID: 1 / Number of copies: 14 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 57.391711 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAAKDVKFGN DARVKMLRGV NVLADAVKVT LGPKGRNVVL DKSFGAPTIT KDGVSVAREI ELEDKFENMG AQMVKEVASK ANDAAGDGT TTATVLAQAI ITEGLKAVAA GMNPMDLKRG IDKAVTAAVE ELKALSVPCS DSKAIAQVGT ISANSDETVG K LIAEAMDK ...String:
MAAKDVKFGN DARVKMLRGV NVLADAVKVT LGPKGRNVVL DKSFGAPTIT KDGVSVAREI ELEDKFENMG AQMVKEVASK ANDAAGDGT TTATVLAQAI ITEGLKAVAA GMNPMDLKRG IDKAVTAAVE ELKALSVPCS DSKAIAQVGT ISANSDETVG K LIAEAMDK VGKEGVITVE DGTGLQDELD VVEGMQFDRG YLSPYFINKP ETGAVELESP FILLADKKIS NIREMLPVLE AV AKAGKPL LIIAEDVEGE ALATLVVNTM RGIVKVAAVK APGFGDRRKA MLQDIATLTG GTVISEEIGM ELEKATLEDL GQA KRVVIN KDTTTIIDGV GEEAAIQGRV AQIRQQIEEA TSDYDREKLQ ERVAKLAGGV AVIKVGAATE VEMKEKKARV EDAL HATRA AVEEGVVAGG GVALIRVASK LADLRGQNED QNVGIKVALR AMEAPLRQIV LNCGEEPSVV ANTVKGGDGN YGYNA ATEE YGNMIDMGIL DPTKVTRSAL QYAASVAGLM ITTECMVTDL PKNDAADLGA AGGMGGMGGM GGMM

UniProtKB: Chaperonin GroEL

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Macromolecule #2: N-(2-{4-[4-(aminomethyl)benzene-1-sulfonamido]phenyl}-1,3-benzoxa...

MacromoleculeName: N-(2-{4-[4-(aminomethyl)benzene-1-sulfonamido]phenyl}-1,3-benzoxazol-5-yl)-5-chlorothiophene-2-sulfonamide
type: ligand / ID: 2 / Number of copies: 7 / Formula: A1AS6
Molecular weightTheoretical: 575.079 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 62.5 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.26 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 20659
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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