+Open data
-Basic information
Entry | Database: PDB / ID: 8p8a | ||||||
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Title | Structure of 5D3-Fab and nanobody(Nb17)-bound ABCG2 | ||||||
Components |
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Keywords | MEMBRANE PROTEIN | ||||||
Function / homology | Function and homology information biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / sphingolipid transporter activity / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport ...biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / sphingolipid transporter activity / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport / external side of apical plasma membrane / sphingolipid biosynthetic process / organic anion transmembrane transporter activity / Sphingolipid de novo biosynthesis / xenobiotic transport across blood-brain barrier / export across plasma membrane / ABC-type xenobiotic transporter / Paracetamol ADME / transepithelial transport / Ciprofloxacin ADME / cellular detoxification / ABC-type xenobiotic transporter activity / NFE2L2 regulating MDR associated enzymes / Heme biosynthesis / Heme degradation / efflux transmembrane transporter activity / xenobiotic 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 / protein homodimerization activity / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / plasma membrane Similarity search - Function | ||||||
Biological species | Mus musculus (house mouse) Lama glama (llama) Homo sapiens (human) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å | ||||||
Authors | Irobalieva, R.N. / Manolaridis, I. / Jackson, S.M. / Ni, D. / Pardon, E. / Stahlberg, H. / Steyaert, J. / Locher, K.P. | ||||||
Funding support | Switzerland, 1items
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Citation | Journal: J Mol Biol / Year: 2023 Title: Structural Basis of the Allosteric Inhibition of Human ABCG2 by Nanobodies. Authors: Rossitza N Irobalieva / Ioannis Manolaridis / Scott M Jackson / Dongchun Ni / Els Pardon / Henning Stahlberg / Jan Steyaert / Kaspar P Locher / Abstract: ABCG2 is an ATP-binding cassette transporter that exports a wide range of xenobiotic compounds and has been recognized as a contributing factor for multidrug resistance in cancer cells. Substrate and ...ABCG2 is an ATP-binding cassette transporter that exports a wide range of xenobiotic compounds and has been recognized as a contributing factor for multidrug resistance in cancer cells. Substrate and inhibitor interactions with ABCG2 have been extensively studied and small molecule inhibitors have been developed that prevent the export of anticancer drugs from tumor cells. Here, we explore the potential for inhibitors that target sites other than the substrate binding pocket of ABCG2. We developed novel nanobodies against ABCG2 and used functional analyses to select three inhibitory nanobodies (Nb8, Nb17 and Nb96) for structural studies by single particle cryo-electron microscopy. Our results showed that these nanobodies allosterically bind to different regions of the nucleotide binding domains. Two copies of Nb8 bind to the apex of the NBDs preventing them from fully closing. Nb17 binds near the two-fold axis of the transporter and interacts with both NBDs. Nb96 binds to the side of the NBD and immobilizes a region connected to key motifs involved in ATP binding and hydrolysis. All three nanobodies prevent the transporter from undergoing conformational changes required for substrate transport. These findings advance our understanding of the molecular basis of modulation of ABCG2 by external binders, which may contribute to the development of a new generation of inhibitors. Furthermore, this is the first example of modulation of human multidrug resistance transporters by nanobodies. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8p8a.cif.gz | 302.9 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8p8a.ent.gz | 244 KB | Display | PDB format |
PDBx/mmJSON format | 8p8a.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/p8/8p8a ftp://data.pdbj.org/pub/pdb/validation_reports/p8/8p8a | HTTPS FTP |
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-Related structure data
Related structure data | 17543MC 8p7wC 8p8jC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Antibody | Mass: 23594.016 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Mus musculus (house mouse) / Production host: Mus musculus (house mouse) #2: Antibody | Mass: 17508.617 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Mus musculus (house mouse) / Production host: Mus musculus (house mouse) #3: Antibody | | Mass: 13384.795 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Lama glama (llama) / Production host: Escherichia coli (E. coli) #4: Protein | Mass: 72385.852 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: ABCG2, ABCP, BCRP, BCRP1, MXR / Production host: Homo sapiens (human) References: UniProt: Q9UNQ0, ABC-type xenobiotic transporter #5: Polysaccharide | Source method: isolated from a genetically manipulated source Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Structure of nanobody (Nb8)-bound ABCG2 / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT |
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Source (natural) | Organism: Homo sapiens (human) |
Source (recombinant) | Organism: Homo sapiens (human) |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE-PROPANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: TFS KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2400 nm / Nominal defocus min: 600 nm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Electron dose: 72 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||
3D reconstruction | Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 109985 / Symmetry type: POINT | ||||||||||||||||
Atomic model building | Space: REAL |