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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0200 | ||||||||||||
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Title | human STEAP4 bound to NADPH, FAD and heme. | ||||||||||||
![]() | None | ||||||||||||
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Function / homology | ![]() ferric-chelate reductase (NADPH) / ferric-chelate reductase (NADPH) activity / cupric reductase (NADH) activity / iron import into cell / copper ion import / fat cell differentiation / protein homotrimerization / FAD binding / early endosome membrane / electron transfer activity ...ferric-chelate reductase (NADPH) / ferric-chelate reductase (NADPH) activity / cupric reductase (NADH) activity / iron import into cell / copper ion import / fat cell differentiation / protein homotrimerization / FAD binding / early endosome membrane / electron transfer activity / endosome / Golgi membrane / heme binding / extracellular exosome / nucleoplasm / membrane / metal ion binding / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.8 Å | ||||||||||||
![]() | Oosterheert W / van Bezouwen LS / Rodenburg RNP / Forster F / Mattevi A / Gros P | ||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Cryo-EM structures of human STEAP4 reveal mechanism of iron(III) reduction. Authors: Wout Oosterheert / Laura S van Bezouwen / Remco N P Rodenburg / Joke Granneman / Friedrich Förster / Andrea Mattevi / Piet Gros / ![]() ![]() Abstract: Enzymes of the six-transmembrane epithelial antigen of the prostate (STEAP) family reduce Fe and Cu ions to facilitate metal-ion uptake by mammalian cells. STEAPs are highly upregulated in several ...Enzymes of the six-transmembrane epithelial antigen of the prostate (STEAP) family reduce Fe and Cu ions to facilitate metal-ion uptake by mammalian cells. STEAPs are highly upregulated in several types of cancer, making them potential therapeutic targets. However, the structural basis for STEAP-catalyzed electron transfer through an array of cofactors to metals at the membrane luminal side remains elusive. Here, we report cryo-electron microscopy structures of human STEAP4 in absence and presence of Fe-NTA. Domain-swapped, trimeric STEAP4 orients NADPH bound to a cytosolic domain onto axially aligned flavin-adenine dinucleotide (FAD) and a single b-type heme that cross the transmembrane-domain to enable electron transfer. Substrate binding within a positively charged ring indicates that iron gets reduced while in complex with its chelator. These molecular principles of iron reduction provide a basis for exploring STEAPs as therapeutic targets. | ||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 8.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.7 KB 24.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 8.6 KB | Display | ![]() |
Images | ![]() | 149.9 KB | ||
Masks | ![]() | 52.7 MB | ![]() | |
Others | ![]() ![]() ![]() | 44.5 MB 45.3 MB 45 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 393.3 KB | Display | ![]() |
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Full document | ![]() | 392.4 KB | Display | |
Data in XML | ![]() | 14.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6hd1MC ![]() 0199C ![]() 6hcyC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
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Annotation | None | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.0285 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Additional map: Unsharpened, unmasked density map of human STEAP4 bound...
File | emd_0200_additional.map | ||||||||||||
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Annotation | Unsharpened, unmasked density map of human STEAP4 bound to NADPH, FAD and heme (cofactor-bound state). Generated by 3D auto-refine in Relion2.1b1. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: First half map of human STEAP4 bound to...
File | emd_0200_half_map_1.map | ||||||||||||
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Annotation | First half map of human STEAP4 bound to NADPH, FAD and heme (cofactor-bound state). Generated by 3D auto-refine in Relion2.1b1. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Second half map of human STEAP4 bound to...
File | emd_0200_half_map_2.map | ||||||||||||
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Annotation | Second half map of human STEAP4 bound to NADPH, FAD and heme (cofactor-bound state). Generated by 3D auto-refine in Relion2.1b1. | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : homotrimer of human STEAP4.
Entire | Name: homotrimer of human STEAP4. |
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Components |
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-Supramolecule #1: homotrimer of human STEAP4.
Supramolecule | Name: homotrimer of human STEAP4. / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() |
Molecular weight | Theoretical: 152 KDa |
-Macromolecule #1: Metalloreductase STEAP4
Macromolecule | Name: Metalloreductase STEAP4 / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO EC number: Oxidoreductases; Oxidizing metal ions; With NAD+ or NADP+ as acceptor |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 52.036 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MEKTCIDALP LTMNSSEKQE TVCIFGTGDF GRSLGLKMLQ CGYSVVFGSR NPQKTTLLPS GAEVLSYSEA AKKSGIIIIA IHREHYDFL TELTEVLNGK ILVDISNNLK INQYPESNAE YLAHLVPGAH VVKAFNTISA WALQSGALDA SRQVFVCGND S KAKQRVMD ...String: MEKTCIDALP LTMNSSEKQE TVCIFGTGDF GRSLGLKMLQ CGYSVVFGSR NPQKTTLLPS GAEVLSYSEA AKKSGIIIIA IHREHYDFL TELTEVLNGK ILVDISNNLK INQYPESNAE YLAHLVPGAH VVKAFNTISA WALQSGALDA SRQVFVCGND S KAKQRVMD IVRNLGLTPM DQGSLMAAKE IEKYPLQLFP MWRFPFYLSA VLCVFLFFYC VIRDVIYPYV YEKKDNTFRM AI SIPNRIF PITALTLLAL VYLPGVIAAI LQLYRGTKYR RFPDWLDHWM LCRKQLGLVA LGFAFLHVLY TLVIPIRYYV RWR LGNLTV TQAILKKENP FSTSSAWLSD SYVALGILGF FLFVLLGITS LPSVSNAVNW REFRFVQSKL GYLTLILCTA HTLV YGGKR FLSPSNLRWY LPAAYVLGLI IPCTVLVIKF VLIMPCVDNT LTRIRQGWER NSKH |
-Macromolecule #2: NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
Macromolecule | Name: NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / type: ligand / ID: 2 / Number of copies: 3 / Formula: NAP |
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Molecular weight | Theoretical: 743.405 Da |
Chemical component information | ![]() ChemComp-NAP: |
-Macromolecule #3: PROTOPORPHYRIN IX CONTAINING FE
Macromolecule | Name: PROTOPORPHYRIN IX CONTAINING FE / type: ligand / ID: 3 / Number of copies: 3 / Formula: HEM |
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Molecular weight | Theoretical: 616.487 Da |
Chemical component information | ![]() ChemComp-HEM: |
-Macromolecule #4: FLAVIN-ADENINE DINUCLEOTIDE
Macromolecule | Name: FLAVIN-ADENINE DINUCLEOTIDE / type: ligand / ID: 4 / Number of copies: 3 / Formula: FAD |
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Molecular weight | Theoretical: 785.55 Da |
Chemical component information | ![]() ChemComp-FAD: |
-Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 3 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Macromolecule #6: (2R)-3-(phosphonooxy)propane-1,2-diyl dihexanoate
Macromolecule | Name: (2R)-3-(phosphonooxy)propane-1,2-diyl dihexanoate / type: ligand / ID: 6 / Number of copies: 3 / Formula: 44E |
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Molecular weight | Theoretical: 368.36 Da |
Chemical component information | ![]() ChemComp-44E: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 4 mg/mL | ||||||||||||
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Buffer | pH: 5.5 Component:
Details: 25 mM MES pH 5.5 200 mM NaCl 0.08% digitonin (w/v) | ||||||||||||
Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK IV / Details: blot time 4seconds blot force 0. | ||||||||||||
Details | human STEAP4 was purified from the HEK293 GNTI- cell membrane through Strep-affinity chromatography and size-exclusion chromatography (SEC). After SEC in digitonin, the sample was monodisperse. Cofactors NADPH and FAD were added before grid freezing. |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Specialist optics | Energy filter - Slit width: 20 eV |
Details | 200 kV Talos Arctica at Utrecht University, the Netherlands. |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Digitization - Frames/image: 1-24 / Number grids imaged: 1 / Number real images: 2321 / Average exposure time: 6.0 sec. / Average electron dose: 45.5 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 130000 |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |