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- EMDB-16069: ABCG2 turnover-1 state with tariquidar bound -

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Basic information

Entry
Database: EMDB / ID: EMD-16069
TitleABCG2 turnover-1 state with tariquidar bound
Map data
Sample
  • Complex: ABCG2 in complex with Tariquidar under turnover condition
    • Protein or peptide: Broad substrate specificity ATP-binding cassette transporter ABCG2
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: CHOLESTEROL
  • Ligand: tariquidar
Function / homology
Function and homology information


biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport / external side of apical plasma membrane ...biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport / external side of apical plasma membrane / organic anion transmembrane transporter activity / xenobiotic transport across blood-brain barrier / export across plasma membrane / ABC-type xenobiotic transporter / Paracetamol ADME / Ciprofloxacin ADME / transepithelial transport / cellular detoxification / ABC-type xenobiotic transporter activity / NFE2L2 regulating MDR associated enzymes / Heme biosynthesis / Heme degradation / lipid transport / xenobiotic transmembrane transporter activity / efflux transmembrane transporter activity / transport across blood-brain barrier / ATPase-coupled transmembrane transporter activity / mitochondrial membrane / brush border membrane / Iron uptake and transport / transmembrane transport / membrane raft / apical plasma membrane / ATP hydrolysis activity / protein homodimerization activity / nucleoplasm / ATP binding / identical protein binding / plasma membrane
Similarity search - Function
ABC transporter family G domain / ABC-2 type transporter / ABC-2 type transporter / ABC-2 type transporter / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Broad substrate specificity ATP-binding cassette transporter ABCG2
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsYu Q / Kowal J / Tajkhorshid E / Locher KP
Funding support Switzerland, United States, 3 items
OrganizationGrant numberCountry
Swiss National Science FoundationNCCR TransCure Switzerland
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P41- GM104601 United States
National Institutes of Health/Office of the DirectorR01-GM123455 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Differential dynamics and direct interaction of bound ligands with lipids in multidrug transporter ABCG2.
Authors: Ali Rasouli / Qin Yu / Sepehr Dehghani-Ghahnaviyeh / Po-Chao Wen / Julia Kowal / Kaspar P Locher / Emad Tajkhorshid /
Abstract: ABCG2 is an ATP-binding cassette (ABC) transporter that extrudes a wide range of xenobiotics and drugs from the cell and contributes to multidrug resistance in cancer cells. Following our recent ...ABCG2 is an ATP-binding cassette (ABC) transporter that extrudes a wide range of xenobiotics and drugs from the cell and contributes to multidrug resistance in cancer cells. Following our recent structural characterization of topotecan-bound ABCG2, here, we present cryo-EM structures of ABCG2 under turnover conditions in complex with a special modulator and slow substrate, tariquidar, in nanodiscs. The structures reveal that similar to topotecan, tariquidar induces two distinct ABCG2 conformations under turnover conditions (turnover-1 and turnover-2). μs-scale molecular dynamics simulations of drug-bound and apo ABCG2 in native-like lipid bilayers, in both topotecan- and tariquidar-bound states, characterize the ligand size as a major determinant of its binding stability. The simulations highlight direct lipid-drug interactions for the smaller topotecan, which exhibits a highly dynamic binding mode. In contrast, the larger tariquidar occupies most of the available volume in the binding pocket, thus leaving little space for lipids to enter the cavity and interact with it. Similarly, when simulating ABCG2 in the apo inward-open state, we also observe spontaneous penetration of phospholipids into the binding cavity. The captured phospholipid diffusion pathway into ABCG2 offers a putative general path to recruit any hydrophobic/amphiphilic substrates directly from the membrane. Our simulations also reveal that ABCG2 rejects cholesterol as a substrate, which is omnipresent in plasma membranes that contain ABCG2. At the same time, cholesterol is found to prohibit the penetration of phospholipids into ABCG2. These molecular findings have direct functional ramifications on ABCG2's function as a transporter.
History
DepositionOct 31, 2022-
Header (metadata) releaseJan 11, 2023-
Map releaseJan 11, 2023-
UpdateJan 11, 2023-
Current statusJan 11, 2023Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_16069.png

Downloads & links

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Map

FileDownload / File: emd_16069.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.66 Å/pix.
x 384 pix.
= 253.44 Å		0.66 Å/pix.
x 384 pix.
= 253.44 Å		0.66 Å/pix.
x 384 pix.
= 253.44 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.66 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.24
Minimum - Maximum-0.9924699 - 1.6620375
Average (Standard dev.)0.005424803 (±0.04588587)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 253.44 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_16069_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_16069_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_16069_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : ABCG2 in complex with Tariquidar under turnover condition

EntireName: ABCG2 in complex with Tariquidar under turnover condition
Components
  • Complex: ABCG2 in complex with Tariquidar under turnover condition
    • Protein or peptide: Broad substrate specificity ATP-binding cassette transporter ABCG2
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: CHOLESTEROL
  • Ligand: tariquidar

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Supramolecule #1: ABCG2 in complex with Tariquidar under turnover condition

SupramoleculeName: ABCG2 in complex with Tariquidar under turnover condition
type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1
Details: ABCG2 was incubated with 5mM ATP, 5mM MgCl2, 0.5mM ADP, 20 uM Tariquidar at room temperature for 10 min
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 144 KDa

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Macromolecule #1: Broad substrate specificity ATP-binding cassette transporter ABCG2

MacromoleculeName: Broad substrate specificity ATP-binding cassette transporter ABCG2
type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: ABC-type xenobiotic transporter
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 73.526938 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MDYKDDDDKG SSSSNVEVFI PVSQGNTNGF PATASNDLKA FTEGAVLSFH NICYRVKLKS GFLPCRKPVE KEILSNINGI MKPGLNAIL GPTGGGKSSL LDVLAARKDP SGLSGDVLIN GAPRPANFKC NSGYVVQDDV VMGTLTVREN LQFSAALRLA T TMTNHEKN ...String:
MDYKDDDDKG SSSSNVEVFI PVSQGNTNGF PATASNDLKA FTEGAVLSFH NICYRVKLKS GFLPCRKPVE KEILSNINGI MKPGLNAIL GPTGGGKSSL LDVLAARKDP SGLSGDVLIN GAPRPANFKC NSGYVVQDDV VMGTLTVREN LQFSAALRLA T TMTNHEKN ERINRVIQEL GLDKVADSKV GTQFIRGVSG GERKRTSIGM ELITDPSILF LDEPTTGLDS STANAVLLLL KR MSKQGRT IIFSIHQPRY SIFKLFDSLT LLASGRLMFH GPAQEALGYF ESAGYHCEAY NNPADFFLDI INGDSTAVAL NRE EDFKAT EIIEPSKQDK PLIEKLAEIY VNSSFYKETK AELHQLSGGE KKKKITVFKE ISYTTSFCHQ LRWVSKRSFK NLLG NPQAS IAQIIVTVVL GLVIGAIYFG LKNDSTGIQN RAGVLFFLTT NQCFSSVSAV ELFVVEKKLF IHEYISGYYR VSSYF LGKL LSDLLPMRML PSIIFTCIVY FMLGLKPKAD AFFVMMFTLM MVAYSASSMA LAIAAGQSVV SVATLLMTIC FVFMMI FSG LLVNLTTIAS WLSWLQYFSI PRYGFTALQH NEFLGQNFCP GLNATGNNPC NYATCTGEEY LVKQGIDLSP WGLWKNH VA LACMIVIFLT IAYLKLLFLK KYS

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Macromolecule #2: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 2 / Number of copies: 2 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM / Adenosine triphosphate

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Macromolecule #3: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 3 / Number of copies: 2 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL / Cholesterol

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Macromolecule #4: tariquidar

MacromoleculeName: tariquidar / type: ligand / ID: 4 / Number of copies: 1 / Formula: R1H
Molecular weightTheoretical: 646.732 Da
Chemical component information

ChemComp-R1H:
tariquidar / inhibitor*YM / Tariquidar

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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

Concentration1 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
40.0 mMC8H18N2O4SHEPES
150.0 mMNaClSodium chloride
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE-PROPANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV
DetailsThis sample was mono-disperse

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 130000
Specialist opticsEnergy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average exposure time: 1.49 sec. / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 2939835
Startup modelType of model: EMDB MAP
EMDB ID:

12951

Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 2.15)
Final 3D classificationNumber classes: 3 / Software - Name: cryoSPARC (ver. 2.15)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 2.15)
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2.15) / Number images used: 211906

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: OTHER / Target criteria: cross-correlation coefficient
Output model

PDB-8bht:
ABCG2 turnover-1 state with tariquidar bound

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