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- EMDB-44506: Cryo-EM co-structure of AcrB with CU244 -

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Basic information

Entry
Database: EMDB / ID: EMD-44506
TitleCryo-EM co-structure of AcrB with CU244
Map data
Sample
  • Complex: H6PD
    • Protein or peptide: Multidrug efflux pump subunit AcrB
  • Ligand: 1,2-Distearoyl-sn-glycerophosphoethanolamine
  • Ligand: (2S)-1-{[(1R,5R)-3-azabicyclo[3.1.0]hexan-6-yl]amino}-3-(3,5-dichlorophenoxy)propan-2-ol
  • Ligand: water
KeywordsAcrB Multidrug Efflux Pump / TRANSLOCASE
Function / homology
Function and homology information


xenobiotic detoxification by transmembrane export across the cell outer membrane / efflux pump complex / periplasmic side of plasma membrane / xenobiotic transmembrane transporter activity / efflux transmembrane transporter activity / outer membrane-bounded periplasmic space / membrane / identical protein binding / plasma membrane
Similarity search - Function
Hydrophobe/amphiphile efflux-1 HAE1 / Acriflavin resistance protein / Multidrug efflux transporter AcrB TolC docking domain, DN/DC subdomains / AcrB/AcrD/AcrF family
Similarity search - Domain/homology
Multidrug efflux pump subunit AcrB
Similarity search - Component
Biological speciesHomo sapiens (human) / Escherichia coli K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.44 Å
AuthorsSu CC
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: mBio / Year: 2023
Title: Bacterial efflux pump modulators prevent bacterial growth in macrophages and under broth conditions that mimic the host environment.
Authors: Samual C Allgood / Chih-Chia Su / Amy L Crooks / Christian T Meyer / Bojun Zhou / Meredith D Betterton / Michael R Barbachyn / Edward W Yu / Corrella S Detweiler /
Abstract: New approaches for combating microbial infections are needed. One strategy for disrupting pathogenesis involves developing compounds that interfere with bacterial virulence. A critical molecular ...New approaches for combating microbial infections are needed. One strategy for disrupting pathogenesis involves developing compounds that interfere with bacterial virulence. A critical molecular determinant of virulence for Gram-negative bacteria are efflux pumps of the resistance-nodulation-division family, which includes AcrAB-TolC. We previously identified small molecules that bind AcrB, inhibit AcrAB-TolC, and do not appear to damage membranes. These efflux pump modulators (EPMs) were discovered in an in-cell screening platform called SAFIRE (Screen for Anti-infectives using Fluorescence microscopy of IntracellulaR Enterobacteriaceae). SAFIRE identifies compounds that disrupt the growth of a Gram-negative human pathogen, serotype Typhimurium (. Typhimurium), in macrophages. We used medicinal chemistry to iteratively design ~200 EPM35 analogs and test them for activity in SAFIRE, generating compounds with nanomolar potency. Analogs were demonstrated to bind AcrB in a substrate binding pocket by cryo-electron microscopy. Despite having amphipathic structures, the EPM analogs do not disrupt membrane voltage, as monitored by FtsZ localization to the cell septum. The EPM analogs had little effect on bacterial growth in standard Mueller Hinton Broth. However, under broth conditions that mimic the micro-environment of the macrophage phagosome, is required for growth, the EPM analogs are bacteriostatic, and the EPM analogs increase the potency of antibiotics. These data suggest that under macrophage-like conditions, the EPM analogs prevent the export of a toxic bacterial metabolite(s) through AcrAB-TolC. Thus, compounds that bind AcrB could disrupt infection by specifically interfering with the export of bacterial toxic metabolites, host defense factors, and/or antibiotics.IMPORTANCEBacterial efflux pumps are critical for resistance to antibiotics and for virulence. We previously identified small molecules that inhibit efflux pumps (efflux pump modulators, EPMs) and prevent pathogen replication in host cells. Here, we used medicinal chemistry to increase the activity of the EPMs against pathogens in cells into the nanomolar range. We show by cryo-electron microscopy that these EPMs bind an efflux pump subunit. In broth culture, the EPMs increase the potency (activity), but not the efficacy (maximum effect), of antibiotics. We also found that bacterial exposure to the EPMs appear to enable the accumulation of a toxic metabolite that would otherwise be exported by efflux pumps. Thus, inhibitors of bacterial efflux pumps could interfere with infection not only by potentiating antibiotics, but also by allowing toxic waste products to accumulate within bacteria, providing an explanation for why efflux pumps are needed for virulence in the absence of antibiotics.
History
DepositionApr 18, 2024-
Header (metadata) releaseMay 8, 2024-
Map releaseMay 8, 2024-
UpdateMay 8, 2024-
Current statusMay 8, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44506.png

Downloads & links

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Map

FileDownload / File: emd_44506.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 400 pix.
= 428. Å		1.07 Å/pix.
x 400 pix.
= 428. Å		1.07 Å/pix.
x 400 pix.
= 428. Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.4
Minimum - Maximum-2.368536 - 3.345385
Average (Standard dev.)0.0001943049 (±0.10497802)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 428.00003 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_44506_additional_1.map
Projections & Slices
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Density Histograms

Histogram

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Half map: #1

Fileemd_44506_half_map_1.map
Projections & Slices
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Histogram

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Half map: #2

Fileemd_44506_half_map_2.map
Projections & Slices
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Sample components

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Entire : H6PD

EntireName: H6PD
Components
  • Complex: H6PD
    • Protein or peptide: Multidrug efflux pump subunit AcrB
  • Ligand: 1,2-Distearoyl-sn-glycerophosphoethanolamine
  • Ligand: (2S)-1-{[(1R,5R)-3-azabicyclo[3.1.0]hexan-6-yl]amino}-3-(3,5-dichlorophenoxy)propan-2-ol
  • Ligand: water

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Supramolecule #1: H6PD

SupramoleculeName: H6PD / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Multidrug efflux pump subunit AcrB

MacromoleculeName: Multidrug efflux pump subunit AcrB / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 113.66518 KDa
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
SequenceString: MPNFFIDRPI FAWVIAIIIM LAGGLAILKL PVAQYPTIAP PAVTISASYP GADAKTVQDT VTQVIEQNMN GIDNLMYMSS NSDSTGTVQ ITLTFESGTD ADIAQVQVQN KLQLAMPLLP QEVQQQGVSV EKSSSSFLMV VGVINTDGTM TQEDISDYVA A NMKDAISR ...String:
MPNFFIDRPI FAWVIAIIIM LAGGLAILKL PVAQYPTIAP PAVTISASYP GADAKTVQDT VTQVIEQNMN GIDNLMYMSS NSDSTGTVQ ITLTFESGTD ADIAQVQVQN KLQLAMPLLP QEVQQQGVSV EKSSSSFLMV VGVINTDGTM TQEDISDYVA A NMKDAISR TSGVGDVQLF GSQYAMRIWM NPNELNKFQL TPVDVITAIK AQNAQVAAGQ LGGTPPVKGQ QLNASIIAQT RL TSTEEFG KILLKVNQDG SRVLLRDVAK IELGGENYDI IAEFNGQPAS GLGIKLATGA NALDTAAAIR AELAKMEPFF PSG LKIVYP YDTTPFVKIS IHEVVKTLVE AIILVFLVMY LFLQNFRATL IPTIAVPVVL LGTFAVLAAF GFSINTLTMF GMVL AIGLL VDDAIVVVEN VERVMAEEGL PPKEATRKSM GQIQGALVGI AMVLSAVFVP MAFFGGSTGA IYRQFSITIV SAMAL SVLV ALILTPALCA TMLKPIAKGD HGEGKKGFFG WFNRMFEKST HHYTDSVGGI LRSTGRYLVL YLIIVVGMAY LFVRLP SSF LPDEDQGVFM TMVQLPAGAT QERTQKVLNE VTHYYLTKEK NNVESVFAVN GFGFAGRGQN TGIAFVSLKD WADRPGE EN KVEAITMRAT RAFSQIKDAM VFAFNLPAIV ELGTATGFDF ELIDQAGLGH EKLTQARNQL LAEAAKHPDM LTSVRPNG L EDTPQFKIDI DQEKAQALGV SINDINTTLG AAWGGSYVND FIDRGRVKKV YVMSEAKYRM LPDDIGDWYV RAADGQMVP FSAFSSSRWE YGSPRLERYN GLPSMEILGQ AAPGKSTGEA MELMEQLASK LPTGVGYDWT GMSYQERLSG NQAPSLYAIS LIVVFLCLA ALYESWSIPF SVMLVVPLGV IGALLAATFR GLTNDVYFQV GLLTTIGLSA KNAILIVEFA KDLMDKEGKG L IEATLDAV RMRLRPILMT SLAFILGVMP LVISTGAGSG AQNAVGTGVM GGMVTATVLA IFFVPVFFVV VRRRFSRKNE DI EHSHTVD HH

UniProtKB: Multidrug efflux pump subunit AcrB

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Macromolecule #2: 1,2-Distearoyl-sn-glycerophosphoethanolamine

MacromoleculeName: 1,2-Distearoyl-sn-glycerophosphoethanolamine / type: ligand / ID: 2 / Number of copies: 2 / Formula: 3PE
Molecular weightTheoretical: 748.065 Da
Chemical component information

ChemComp-3PE:
1,2-Distearoyl-sn-glycerophosphoethanolamine / phospholipid*YM / Phosphatidylethanolamine

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Macromolecule #3: (2S)-1-{[(1R,5R)-3-azabicyclo[3.1.0]hexan-6-yl]amino}-3-(3,5-dich...

MacromoleculeName: (2S)-1-{[(1R,5R)-3-azabicyclo[3.1.0]hexan-6-yl]amino}-3-(3,5-dichlorophenoxy)propan-2-ol
type: ligand / ID: 3 / Number of copies: 1 / Formula: A1AOF
Molecular weightTheoretical: 317.211 Da

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Macromolecule #4: water

MacromoleculeName: water / type: ligand / ID: 4 / Number of copies: 5 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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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

Concentration0.5 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
DetailsThis is from a heterogeneous and impure protein sample.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 29.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL / In silico model: ab initio reconstruction by cryosparc
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.44 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 162048

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Atomic model buiding 1

RefinementProtocol: AB INITIO MODEL
Output model

PDB-9bft:
Cryo-EM co-structure of AcrB with CU244

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