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- EMDB-21440: Structure of ABCG2 bound to SN38 -

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Basic information

Entry
Database: EMDB / ID: EMD-21440
TitleStructure of ABCG2 bound to SN38
Map dataCryo-EM map of ABCG2 bound to SN38
Sample
  • Complex: ABCG2 reconstituted in lipid nanodisc
    • Protein or peptide: Broad substrate specificity ATP-binding cassette transporter ABCG2
  • Ligand: CHOLESTEROL
  • Ligand: 7-ethyl-10-hydroxycamptothecin
KeywordsABCG2 / SN38 / ABC transporter / nanodisc / TRANSLOCASE
Function / homology
Function and homology information


biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / sphingolipid transporter activity / renal urate salt excretion / Abacavir transmembrane transport / urate metabolic process / urate transmembrane transporter activity / external side of apical plasma membrane ...biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / sphingolipid transporter activity / renal urate salt excretion / Abacavir transmembrane transport / urate metabolic process / urate transmembrane transporter activity / external side of apical plasma membrane / sphingolipid biosynthetic process / organic anion transport / Sphingolipid de novo biosynthesis / organic anion transmembrane transporter activity / xenobiotic transport across blood-brain barrier / transepithelial transport / export across plasma membrane / ABC-type xenobiotic transporter / Paracetamol ADME / Ciprofloxacin ADME / NFE2L2 regulating MDR associated enzymes / ABC-type xenobiotic transporter activity / Differentiation of keratinocytes in interfollicular epidermis in mammalian skin / cellular detoxification / Heme biosynthesis / Heme degradation / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / ATPase-coupled transmembrane transporter activity / transport across blood-brain barrier / mitochondrial membrane / brush border membrane / Iron uptake and transport / transmembrane transport / membrane raft / apical plasma membrane / protein homodimerization activity / ATP hydrolysis 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: 4.1 Å
AuthorsOrlando BJ / Liao M
Funding support United States, 1 items
OrganizationGrant numberCountry
American Cancer SocietyPF1721201DMC United States
CitationJournal: Nat Commun / Year: 2020
Title: ABCG2 transports anticancer drugs via a closed-to-open switch.
Authors: Benjamin J Orlando / Maofu Liao /
Abstract: ABCG2 is an ABC transporter that extrudes a variety of compounds from cells, and presents an obstacle in treating chemotherapy-resistant cancers. Despite recent structural insights, no anticancer ...ABCG2 is an ABC transporter that extrudes a variety of compounds from cells, and presents an obstacle in treating chemotherapy-resistant cancers. Despite recent structural insights, no anticancer drug bound to ABCG2 has been resolved, and the mechanisms of multidrug transport remain obscure. Such a gap of knowledge limits the development of novel compounds that block or evade this critical molecular pump. Here we present single-particle cryo-EM studies of ABCG2 in the apo state, and bound to the three structurally distinct chemotherapeutics. Without the binding of conformation-selective antibody fragments or inhibitors, the resting ABCG2 adopts a closed conformation. Our cryo-EM, biochemical, and functional analyses reveal the binding mode of three chemotherapeutic compounds, demonstrate how these molecules open the closed conformation of the transporter, and establish that imatinib is particularly effective in stabilizing the inward facing conformation of ABCG2. Together these studies reveal the previously unrecognized conformational cycle of ABCG2.
History
DepositionFeb 22, 2020-
Header (metadata) releaseMar 18, 2020-
Map releaseMay 13, 2020-
UpdateOct 9, 2024-
Current statusOct 9, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.085
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.085
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6vxj
  • Surface level: 0.085
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21440.png

Downloads & links

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Map

FileDownload / File: emd_21440.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM map of ABCG2 bound to SN38
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.23 Å/pix.
x 192 pix.
= 236.16 Å		1.23 Å/pix.
x 192 pix.
= 236.16 Å		1.23 Å/pix.
x 192 pix.
= 236.16 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.23 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.085 / Movie #1: 0.085
Minimum - Maximum-0.21361378 - 0.34661216
Average (Standard dev.)-0.000024400877 (±0.013624551)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-96-96-96
Dimensions192192192
Spacing192192192
CellA=B=C: 236.16 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.231.231.23
M x/y/z192192192
origin x/y/z0.0000.0000.000
length x/y/z236.160236.160236.160
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS-96-96-96
NC/NR/NS192192192
D min/max/mean-0.2140.347-0.000

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Supplemental data

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Additional map: Unfiltered and unsharpened cryo-EM map of ABCG2 bound to SN38

Fileemd_21440_additional.map
AnnotationUnfiltered and unsharpened cryo-EM map of ABCG2 bound to SN38
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : ABCG2 reconstituted in lipid nanodisc

EntireName: ABCG2 reconstituted in lipid nanodisc
Components
  • Complex: ABCG2 reconstituted in lipid nanodisc
    • Protein or peptide: Broad substrate specificity ATP-binding cassette transporter ABCG2
  • Ligand: CHOLESTEROL
  • Ligand: 7-ethyl-10-hydroxycamptothecin

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Supramolecule #1: ABCG2 reconstituted in lipid nanodisc

SupramoleculeName: ABCG2 reconstituted in lipid nanodisc / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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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: 72.385852 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSSSNVEVFI PVSQGNTNGF PATASNDLKA FTEGAVLSFH NICYRVKLKS GFLPCRKPVE KEILSNINGI MKPGLNAILG PTGGGKSSL LDVLAARKDP SGLSGDVLIN GAPRPANFKC NSGYVVQDDV VMGTLTVREN LQFSAALRLA TTMTNHEKNE R INRVIQEL ...String:
MSSSNVEVFI PVSQGNTNGF PATASNDLKA FTEGAVLSFH NICYRVKLKS GFLPCRKPVE KEILSNINGI MKPGLNAILG PTGGGKSSL LDVLAARKDP SGLSGDVLIN GAPRPANFKC NSGYVVQDDV VMGTLTVREN LQFSAALRLA TTMTNHEKNE R INRVIQEL GLDKVADSKV GTQFIRGVSG GERKRTSIGM ELITDPSILF LDEPTTGLDS STANAVLLLL KRMSKQGRTI IF SIHQPRY SIFKLFDSLT LLASGRLMFH GPAQEALGYF ESAGYHCEAY NNPADFFLDI INGDSTAVAL NREEDFKATE IIE PSKQDK PLIEKLAEIY VNSSFYKETK AELHQLSGGE KKKKITVFKE ISYTTSFCHQ LRWVSKRSFK NLLGNPQASI AQII VTVVL GLVIGAIYFG LKNDSTGIQN RAGVLFFLTT NQCFSSVSAV ELFVVEKKLF IHEYISGYYR VSSYFLGKLL SDLLP MRML PSIIFTCIVY FMLGLKPKAD AFFVMMFTLM MVAYSASSMA LAIAAGQSVV SVATLLMTIC FVFMMIFSGL LVNLTT IAS WLSWLQYFSI PRYGFTALQH NEFLGQNFCP GLNATGNNPC NYATCTGEEY LVKQGIDLSP WGLWKNHVAL ACMIVIF LT IAYLKLLFLK KYS

UniProtKB: Broad substrate specificity ATP-binding cassette transporter ABCG2

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Macromolecule #2: CHOLESTEROL

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

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #3: 7-ethyl-10-hydroxycamptothecin

MacromoleculeName: 7-ethyl-10-hydroxycamptothecin / type: ligand / ID: 3 / Number of copies: 1 / Formula: RS4
Molecular weightTheoretical: 392.405 Da
Chemical component information

ChemComp-RS4:
7-ethyl-10-hydroxycamptothecin / antineoplastic, inhibitor*YM

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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

Concentration1.2 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
150.0 mMNaClsodium chloride
25.0 mMC4H11NO3Tris base
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 92 % / Instrument: GATAN CRYOPLUNGE 3

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Electron microscopy

MicroscopeFEI POLARA 300
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average exposure time: 8.0 sec. / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 31000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.0 mm
Sample stageCooling holder cryogen: NITROGEN
Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C2 (2 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 97737
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0) / Details: Relion
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL
Output model

PDB-6vxj:
Structure of ABCG2 bound to SN38

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