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- EMDB-29648: Cryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synt... -

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Basic information

Entry
Database: EMDB / ID: EMD-29648
TitleCryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase FO region
Map dataCryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase FO region (sharpened)
Sample
  • Complex: SQ31f-bound Mycobacterium smegmatis ATP synthase FO region
    • Protein or peptide: ATP synthase subunit c
    • Protein or peptide: ATP synthase subunit a
    • Protein or peptide: ATP synthase subunit b
    • Protein or peptide: ATP synthase subunit b-delta
  • Ligand: 3-[4-(morpholin-4-yl)phenyl]-4-{[(pyridin-2-yl)methyl]amino}cyclobut-3-ene-1,2-dione
KeywordsATP synthase / mycobacterial / inhibitor / tuberculosis / antibiotic / HYDROLASE / TRANSLOCASE-INHIBITOR complex
Function / homology
Function and homology information


proton-transporting ATP synthase complex, coupling factor F(o) / proton-transporting ATP synthase activity, rotational mechanism / hydrolase activity / lipid binding / plasma membrane
Similarity search - Function
ATP synthase, F0 complex, subunit b, bacterial / F-type ATP synthase subunit B-like, membrane domain superfamily / : / ATP synthase, F0 complex, subunit A, bacterial/chloroplast / ATP synthase, F0 complex, subunit b/b', bacterial/chloroplast / ATP synthase B/B' CF(0) / ATP synthase, F0 complex, subunit C, bacterial/chloroplast / ATP synthase, F0 complex, subunit A / ATP synthase, F0 complex, subunit A, active site / ATP synthase, F0 complex, subunit A superfamily ...ATP synthase, F0 complex, subunit b, bacterial / F-type ATP synthase subunit B-like, membrane domain superfamily / : / ATP synthase, F0 complex, subunit A, bacterial/chloroplast / ATP synthase, F0 complex, subunit b/b', bacterial/chloroplast / ATP synthase B/B' CF(0) / ATP synthase, F0 complex, subunit C, bacterial/chloroplast / ATP synthase, F0 complex, subunit A / ATP synthase, F0 complex, subunit A, active site / ATP synthase, F0 complex, subunit A superfamily / ATP synthase A chain / ATP synthase a subunit signature. / ATPase, OSCP/delta subunit / ATP synthase delta (OSCP) subunit / ATP synthase, F0 complex, subunit C / F1F0 ATP synthase subunit C superfamily / ATP synthase, F0 complex, subunit C, DCCD-binding site / ATP synthase c subunit signature. / V-ATPase proteolipid subunit C-like domain / F/V-ATP synthase subunit C superfamily / ATP synthase subunit C
Similarity search - Domain/homology
ATP synthase subunit b-delta / ATP synthase subunit b / ATP synthase subunit c / ATP synthase subunit a
Similarity search - Component
Biological speciesMycolicibacterium smegmatis MC2 155 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsCourbon GM / Rubinstein JL
Funding support Canada, 1 items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)PJT162186 Canada
CitationJournal: EMBO J / Year: 2023
Title: Mechanism of mycobacterial ATP synthase inhibition by squaramides and second generation diarylquinolines.
Authors: Gautier M Courbon / Paul R Palme / Lea Mann / Adrian Richter / Peter Imming / John L Rubinstein /
Abstract: Mycobacteria, such as Mycobacterium tuberculosis, depend on the activity of adenosine triphosphate (ATP) synthase for growth. The diarylquinoline bedaquiline (BDQ), a mycobacterial ATP synthase ...Mycobacteria, such as Mycobacterium tuberculosis, depend on the activity of adenosine triphosphate (ATP) synthase for growth. The diarylquinoline bedaquiline (BDQ), a mycobacterial ATP synthase inhibitor, is an important medication for treatment of drug-resistant tuberculosis but suffers from off-target effects and is susceptible to resistance mutations. Consequently, both new and improved mycobacterial ATP synthase inhibitors are needed. We used electron cryomicroscopy and biochemical assays to study the interaction of Mycobacterium smegmatis ATP synthase with the second generation diarylquinoline TBAJ-876 and the squaramide inhibitor SQ31f. The aryl groups of TBAJ-876 improve binding compared with BDQ, while SQ31f, which blocks ATP synthesis ~10 times more potently than ATP hydrolysis, binds a previously unknown site in the enzyme's proton-conducting channel. Remarkably, BDQ, TBAJ-876, and SQ31f all induce similar conformational changes in ATP synthase, suggesting that the resulting conformation is particularly suited for drug binding. Further, high concentrations of the diarylquinolines uncouple the transmembrane proton motive force while for SQ31f they do not, which may explain why high concentrations of diarylquinolines, but not SQ31f, have been reported to kill mycobacteria.
History
DepositionJan 31, 2023-
Header (metadata) releaseFeb 15, 2023-
Map releaseFeb 15, 2023-
UpdateJun 19, 2024-
Current statusJun 19, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_29648.png

Downloads & links

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Map

FileDownload / File: emd_29648.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase FO region (sharpened)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.03 Å/pix.
x 320 pix.
= 329.6 Å		1.03 Å/pix.
x 320 pix.
= 329.6 Å		1.03 Å/pix.
x 320 pix.
= 329.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.03 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.44
Minimum - Maximum-3.9263673 - 8.285923
Average (Standard dev.)0.013921129 (±0.1693313)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 329.59998 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Cryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase...

Fileemd_29648_half_map_1.map
AnnotationCryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase FO region (Half A)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Cryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase...

Fileemd_29648_half_map_2.map
AnnotationCryo-EM structure of SQ31f-bound Mycobacterium smegmatis ATP synthase FO region (Half B)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : SQ31f-bound Mycobacterium smegmatis ATP synthase FO region

EntireName: SQ31f-bound Mycobacterium smegmatis ATP synthase FO region
Components
  • Complex: SQ31f-bound Mycobacterium smegmatis ATP synthase FO region
    • Protein or peptide: ATP synthase subunit c
    • Protein or peptide: ATP synthase subunit a
    • Protein or peptide: ATP synthase subunit b
    • Protein or peptide: ATP synthase subunit b-delta
  • Ligand: 3-[4-(morpholin-4-yl)phenyl]-4-{[(pyridin-2-yl)methyl]amino}cyclobut-3-ene-1,2-dione

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Supramolecule #1: SQ31f-bound Mycobacterium smegmatis ATP synthase FO region

SupramoleculeName: SQ31f-bound Mycobacterium smegmatis ATP synthase FO region
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)

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Macromolecule #1: ATP synthase subunit c

MacromoleculeName: ATP synthase subunit c / type: protein_or_peptide / ID: 1 / Number of copies: 9 / Enantiomer: LEVO
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 8.597982 KDa
SequenceString:
MDLDPNAIIT AGALIGGGLI MGGGAIGAGI GDGIAGNALI SGIARQPEAQ GRLFTPFFIT VGLVEAAYFI NLAFMALFVF ATPGLQ

UniProtKB: ATP synthase subunit c

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Macromolecule #2: ATP synthase subunit a

MacromoleculeName: ATP synthase subunit a / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 27.568482 KDa
SequenceString: MLAAEEGGAA IHVGHHTLVF ELFGMTFNGD TILATAVTAV IVIALAFYLR AKVTSTGVPS GVQLFWEALT IQMRQQIEGS IGMKIAPFV LPLSVTIFVF ILISNWLAVL PLQYGGADGA AAELYKAPAS DINFVLALAL FVFVCYHAAG IWRRGIVGHP I KVVKGHVA ...String:
MLAAEEGGAA IHVGHHTLVF ELFGMTFNGD TILATAVTAV IVIALAFYLR AKVTSTGVPS GVQLFWEALT IQMRQQIEGS IGMKIAPFV LPLSVTIFVF ILISNWLAVL PLQYGGADGA AAELYKAPAS DINFVLALAL FVFVCYHAAG IWRRGIVGHP I KVVKGHVA FLAPINIVEE LAKPISLALR LFGNIFAGGI LVALIAMFPW YIQWFPNAVW KTFDLFVGLI QAFIFSLLTI LY FSQSMEL DHEDH

UniProtKB: ATP synthase subunit a

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Macromolecule #3: ATP synthase subunit b

MacromoleculeName: ATP synthase subunit b / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 17.636701 KDa
SequenceString:
MGEFSATILA ASQAAEEGGG GSNFLIPNGT FFAVLIIFLI VLGVISKWVV PPISKVLAER EAMLAKTAAD NRKSAEQVAA AQADYEKEM AEARAQASAL RDEARAAGRS VVDEKRAQAS GEVAQTLTQA DQQLSAQGDQ VRSGLESSVD GLSAKLASRI L GVDVNSGG TQ

UniProtKB: ATP synthase subunit b

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Macromolecule #4: ATP synthase subunit b-delta

MacromoleculeName: ATP synthase subunit b-delta / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 47.504723 KDa
SequenceString: MSIFIGQLIG FAVIAFIIVK WVVPPVRTLM RNQQEAVRAA LAESAEAAKK LADADAMHAK ALADAKAESE KVTEEAKQDS ERIAAQLSE QAGSEAERIK AQGAQQIQLM RQQLIRQLRT GLGAEAVNKA AEIVRAHVAD PQAQSATVDR FLSELEQMAP S SVVIDTAA ...String:
MSIFIGQLIG FAVIAFIIVK WVVPPVRTLM RNQQEAVRAA LAESAEAAKK LADADAMHAK ALADAKAESE KVTEEAKQDS ERIAAQLSE QAGSEAERIK AQGAQQIQLM RQQLIRQLRT GLGAEAVNKA AEIVRAHVAD PQAQSATVDR FLSELEQMAP S SVVIDTAA TSRLRAASRQ SLAALVEKFD SVAGGLDADG LTNLADELAS VAKLLLSETA LNKHLAEPTD DSAPKVRLLE RL LSDKVSA TTLDLLRTAV SNRWSTESNL IDAVEHTARL ALLKRAEIAG EVDEVEEQLF RFGRVLDAEP RLSALLSDYT TPA EGRVAL LDKALTGRPG VNQTAAALLS QTVGLLRGER ADEAVIDLAE LAVSRRGEVV AHVSAAAELS DAQRTRLTEV LSRI YGRPV SVQLHVDPEL LGGLSITVGD EVIDGSIASR LAAAQTGLPD

UniProtKB: ATP synthase subunit b-delta

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Macromolecule #5: 3-[4-(morpholin-4-yl)phenyl]-4-{[(pyridin-2-yl)methyl]amino}cyclo...

MacromoleculeName: 3-[4-(morpholin-4-yl)phenyl]-4-{[(pyridin-2-yl)methyl]amino}cyclobut-3-ene-1,2-dione
type: ligand / ID: 5 / Number of copies: 1 / Formula: SQC
Molecular weightTheoretical: 349.383 Da
Chemical component information

ChemComp-SQC:
3-[4-(morpholin-4-yl)phenyl]-4-{[(pyridin-2-yl)methyl]amino}cyclobut-3-ene-1,2-dione

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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

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 54.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.9 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 228696
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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