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- PDB-6hco: Cryo-EM structure of the ABCG2 E211Q mutant bound to estrone 3-su... -

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Basic information

Entry
Database: PDB / ID: 6hco
TitleCryo-EM structure of the ABCG2 E211Q mutant bound to estrone 3-sulfate and 5D3-Fab
Components
  • 5D3-Fab heavy chain
  • 5D3-Fab light chain
  • ATP-binding cassette sub-family G member 2
KeywordsMEMBRANE PROTEIN / Multidrug transporter / cancer
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
estrone 3-sulfate / Broad substrate specificity ATP-binding cassette transporter ABCG2
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.58 Å
AuthorsManolaridis, I. / Jackson, S.M. / Taylor, N.M.I. / Kowal, J. / Stahlberg, H. / Locher, K.P.
Funding support Switzerland, 2items
OrganizationGrant numberCountry
Swiss National Science Foundation Switzerland
ETH-22-14-1 Switzerland
CitationJournal: Nature / Year: 2018
Title: Cryo-EM structures of a human ABCG2 mutant trapped in ATP-bound and substrate-bound states.
Authors: Ioannis Manolaridis / Scott M Jackson / Nicholas M I Taylor / Julia Kowal / Henning Stahlberg / Kaspar P Locher /
Abstract: ABCG2 is a transporter protein of the ATP-binding-cassette (ABC) family that is expressed in the plasma membrane in cells of various tissues and tissue barriers, including the blood-brain, blood- ...ABCG2 is a transporter protein of the ATP-binding-cassette (ABC) family that is expressed in the plasma membrane in cells of various tissues and tissue barriers, including the blood-brain, blood-testis and maternal-fetal barriers. Powered by ATP, it translocates endogenous substrates, affects the pharmacokinetics of many drugs and protects against a wide array of xenobiotics, including anti-cancer drugs. Previous studies have revealed the architecture of ABCG2 and the structural basis of its inhibition by small molecules and antibodies. However, the mechanisms of substrate recognition and ATP-driven transport are unknown. Here we present high-resolution cryo-electron microscopy (cryo-EM) structures of human ABCG2 in a substrate-bound pre-translocation state and an ATP-bound post-translocation state. For both structures, we used a mutant containing a glutamine replacing the catalytic glutamate (ABCG2), which resulted in reduced ATPase and transport rates and facilitated conformational trapping for structural studies. In the substrate-bound state, a single molecule of estrone-3-sulfate (ES) is bound in a central, hydrophobic and cytoplasm-facing cavity about halfway across the membrane. Only one molecule of ES can bind in the observed binding mode. In the ATP-bound state, the substrate-binding cavity has collapsed while an external cavity has opened to the extracellular side of the membrane. The ATP-induced conformational changes include rigid-body shifts of the transmembrane domains, pivoting of the nucleotide-binding domains (NBDs), and a change in the relative orientation of the NBD subdomains. Mutagenesis and in vitro characterization of transport and ATPase activities demonstrate the roles of specific residues in substrate recognition, including a leucine residue that forms a 'plug' between the two cavities. Our results show how ABCG2 harnesses the energy of ATP binding to extrude ES and other substrates, and suggest that the size and binding affinity of compounds are important for distinguishing substrates from inhibitors.
History
DepositionAug 15, 2018Deposition site: PDBE / Processing site: PDBE
Revision 1.0Nov 7, 2018Provider: repository / Type: Initial release
Revision 1.1Nov 21, 2018Group: Data collection / Database references / Category: citation
Item: _citation.journal_id_ISSN / _citation.journal_volume ..._citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Dec 18, 2019Group: Other / Category: atom_sites / cell
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _cell.Z_PDB
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.pdbx_formal_charge / _atom_site.type_symbol / _chem_comp.name / _chem_comp.type / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _entity.type / _pdbx_struct_assembly_gen.asym_id_list / _struct_conn.pdbx_role / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation

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Structure visualization

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  • Deposited structure unit
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Structure viewerMolecule:
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Assembly

Deposited unit
A: ATP-binding cassette sub-family G member 2
C: 5D3-Fab light chain
D: 5D3-Fab heavy chain
E: 5D3-Fab light chain
F: 5D3-Fab heavy chain
B: ATP-binding cassette sub-family G member 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)242,8649
Polymers241,6656
Non-polymers1,1993
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area12440 Å2
ΔGint-61 kcal/mol
Surface area64230 Å2
MethodPISA

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Components

#1: Protein ATP-binding cassette sub-family G member 2 / Breast cancer resistance protein / CDw338 / Mitoxantrone resistance-associated protein / Placenta- ...Breast cancer resistance protein / CDw338 / Mitoxantrone resistance-associated protein / Placenta-specific ATP-binding cassette transporter / Urate exporter


Mass: 73394.758 Da / Num. of mol.: 2 / Mutation: E211Q
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ABCG2, ABCP, BCRP, BCRP1, MXR / Cell line (production host): HEK293 EBNA / Production host: Homo sapiens (human) / References: UniProt: Q9UNQ0
#2: Antibody 5D3-Fab light chain


Mass: 23594.016 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Cell line (production host): Hybridoma / Production host: Mus musculus (house mouse)
#3: Antibody 5D3-Fab heavy chain


Mass: 23843.633 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Cell line (production host): Hybridoma / Production host: Mus musculus (house mouse)
#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Mass: 424.401 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#5: Chemical ChemComp-FY5 / estrone 3-sulfate / Estrone sulfate


Mass: 350.429 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C18H22O5S / Comment: medication, hormone*YM

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1nanodisc-reconsituted ABCG2 E211Q mutant bound to estrone 3-sulfate and 5D3-FabCOMPLEX#1-#30NATURAL
2ABCG2 E211Q mutantCOMPLEX#11RECOMBINANT
35D3-FabCOMPLEX#2-#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
13Mus musculus (house mouse)10090
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDCell
13Mus musculus (house mouse)10090
22Homo sapiens (human)9606HEK293 EBNA
Buffer solutionpH: 7.5
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingAverage exposure time: 0.2 sec. / Electron dose: 100 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 3984
Image scansMovie frames/image: 50

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
IDNameCategory
2SerialEMimage acquisition
7Cootmodel fitting
9PHENIXmodel refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 42790 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00912625
ELECTRON MICROSCOPYf_angle_d1.0117121
ELECTRON MICROSCOPYf_dihedral_angle_d7.4467392
ELECTRON MICROSCOPYf_chiral_restr0.0591958
ELECTRON MICROSCOPYf_plane_restr0.0072132

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