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- EMDB-27498: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidi... -

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Basic information

Entry
Database: EMDB / ID: EMD-27498
TitleCryo-EM structure of human ferroportin/slc40 bound to minihepcidin PR73 in nanodisc
Map dataUnsharpened map of human ferroportin/slc40 bound to minihepcidin PR73
Sample
  • Complex: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidin PR73 in nanodisc
    • Protein or peptide: Solute carrier family 40 member 1
    • Protein or peptide: 11F9 light-chain
    • Protein or peptide: 11F9 heavy-chain
  • Protein or peptide: Minihepcidin PR73
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: water
KeywordsSLC40 / Fpn / ferroportin / iron / transporter / hepcidin / minihepcidin / PR73 / human / nanodisc / MEMBRANE PROTEIN
Function / homology
Function and homology information


spleen trabecula formation / iron ion export across plasma membrane / Defective SLC40A1 causes hemochromatosis 4 (HFE4) (duodenum) / Defective SLC40A1 causes hemochromatosis 4 (HFE4) (macrophages) / Defective CP causes aceruloplasminemia (ACERULOP) / Metal ion SLC transporters / iron ion transmembrane transport / lymphocyte homeostasis / iron ion transmembrane transporter activity / ferrous iron transmembrane transporter activity ...spleen trabecula formation / iron ion export across plasma membrane / Defective SLC40A1 causes hemochromatosis 4 (HFE4) (duodenum) / Defective SLC40A1 causes hemochromatosis 4 (HFE4) (macrophages) / Defective CP causes aceruloplasminemia (ACERULOP) / Metal ion SLC transporters / iron ion transmembrane transport / lymphocyte homeostasis / iron ion transmembrane transporter activity / ferrous iron transmembrane transporter activity / endothelium development / peptide hormone binding / establishment of localization in cell / Iron uptake and transport / multicellular organismal-level iron ion homeostasis / synaptic vesicle / basolateral plasma membrane / intracellular iron ion homeostasis / transcription by RNA polymerase II / apoptotic process / negative regulation of apoptotic process / positive regulation of transcription by RNA polymerase II / nucleoplasm / membrane / identical protein binding / metal ion binding / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Ferroportin-1 / Ferroportin1 (FPN1) / MFS transporter superfamily
Similarity search - Domain/homology
Solute carrier family 40 member 1
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsShen J / Wilbon AS / Pan Y / Zhou M
Funding support United States, 4 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)DK122784 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL086392 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL157473 United States
Cancer Prevention and Research Institute of Texas (CPRIT)R1223 United States
CitationJournal: PLoS Biol / Year: 2023
Title: Structural basis of ferroportin inhibition by minihepcidin PR73.
Authors: Azaan Saalim Wilbon / Jiemin Shen / Piotr Ruchala / Ming Zhou / Yaping Pan /
Abstract: Ferroportin (Fpn) is the only known iron exporter in humans and is essential for maintaining iron homeostasis. Fpn activity is suppressed by hepcidin, an endogenous peptide hormone, which inhibits ...Ferroportin (Fpn) is the only known iron exporter in humans and is essential for maintaining iron homeostasis. Fpn activity is suppressed by hepcidin, an endogenous peptide hormone, which inhibits iron export and promotes endocytosis of Fpn. Hepcidin deficiency leads to hemochromatosis and iron-loading anemia. Previous studies have shown that small peptides that mimic the first few residues of hepcidin, i.e., minihepcidins, are more potent than hepcidin. However, the mechanism of enhanced inhibition by minihepcidins remains unclear. Here, we report the structure of human ferroportin in complex with a minihepcidin, PR73 that mimics the first 9 residues of hepcidin, at 2.7 Å overall resolution. The structure reveals novel interactions that were not present between Fpn and hepcidin. We validate PR73-Fpn interactions through binding and transport assays. These results provide insights into how minihepcidins increase inhibition potency and will guide future development of Fpn inhibitors.
History
DepositionJul 7, 2022-
Header (metadata) releaseDec 7, 2022-
Map releaseDec 7, 2022-
UpdateNov 15, 2023-
Current statusNov 15, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27498.png

Downloads & links

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Map

FileDownload / File: emd_27498.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationUnsharpened map of human ferroportin/slc40 bound to minihepcidin PR73
Voxel sizeX=Y=Z: 1.1 Å
Density
Contour LevelBy AUTHOR: 0.38
Minimum - Maximum-0.5465213 - 1.8263304
Average (Standard dev.)0.012258119 (±0.07497974)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 220.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half A map of human ferroportin/slc40 bound to minihepcidin PR73

Fileemd_27498_half_map_1.map
AnnotationHalf_A map of human ferroportin/slc40 bound to minihepcidin PR73
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half B map of human ferroportin/slc40 bound to minihepcidin PR73

Fileemd_27498_half_map_2.map
AnnotationHalf_B map of human ferroportin/slc40 bound to minihepcidin PR73
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of human ferroportin/slc40 bound to minihepcidi...

EntireName: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidin PR73 in nanodisc
Components
  • Complex: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidin PR73 in nanodisc
    • Protein or peptide: Solute carrier family 40 member 1
    • Protein or peptide: 11F9 light-chain
    • Protein or peptide: 11F9 heavy-chain
  • Protein or peptide: Minihepcidin PR73
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: water

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Supramolecule #1: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidi...

SupramoleculeName: Cryo-EM structure of human ferroportin/slc40 bound to minihepcidin PR73 in nanodisc
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Solute carrier family 40 member 1

MacromoleculeName: Solute carrier family 40 member 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 63.386621 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MTRAGDHNRQ RGCCGSLADY LTSAKFLLYL GHSLSTWGDR MWHFAVSVFL VELYGNSLLL TAVYGLVVAG SVLVLGAIIG DWVDKNARL KVAQTSLVVQ NVSVILCGII LMMVFLHKHE LLTMYHGWVL TSCYILIITI ANIANLASTA TAITIQRDWI V VVAGEDRS ...String:
MTRAGDHNRQ RGCCGSLADY LTSAKFLLYL GHSLSTWGDR MWHFAVSVFL VELYGNSLLL TAVYGLVVAG SVLVLGAIIG DWVDKNARL KVAQTSLVVQ NVSVILCGII LMMVFLHKHE LLTMYHGWVL TSCYILIITI ANIANLASTA TAITIQRDWI V VVAGEDRS KLANMNATIR RIDQLTNILA PMAVGQIMTF GSPVIGCGFI SGWNLVSMCV EYVLLWKVYQ KTPALAVKAG LK EEETELK QLNLHKDTEP KPLEGTHLMG VKDSNIHELE HEQEPTCASQ MAEPFRTFRD GWVSYYNQPV FLAGMGLAFL YMT VLGFDC ITTGYAYTQG LSGSILSILM GASAITGIMG TVAFTWLRRK CGLVRTGLIS GLAQLSCLIL CVISVFMPGS PLDL SVSPF EDIRSRFIQG ESITPTKIPE ITTEIYMSNG SNSANIVPET SPESVPIISV SLLFAGVIAA RIGLWSFDLT VTQLL QENV IESERGIING VQNSMNYLLD LLHFIMVILA PNPEAFGLLV LISVSFVAMG HIMYFRFAQN TLGNKLFACG PDAKEV RKE NQANTSVVEN LYFQ

UniProtKB: Solute carrier family 40 member 1

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Macromolecule #2: 11F9 light-chain

MacromoleculeName: 11F9 light-chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.493885 KDa
SequenceString: DIVMTQSQKF MSTSVGDRVS ITCKASQNVG TAVAWYQKKP GQSPKLLIYS ASNRYSGVPD RFTGSGSGTD FTLTISNMQS EDLADYFCQ QYGSYPLTFG SGTKLEIKEA EAAPTVSIFP PSSEQLTSGG ASVVCFLNNF YPKDINVKWK IDGSERQNGV L NSWTDQDS ...String:
DIVMTQSQKF MSTSVGDRVS ITCKASQNVG TAVAWYQKKP GQSPKLLIYS ASNRYSGVPD RFTGSGSGTD FTLTISNMQS EDLADYFCQ QYGSYPLTFG SGTKLEIKEA EAAPTVSIFP PSSEQLTSGG ASVVCFLNNF YPKDINVKWK IDGSERQNGV L NSWTDQDS KDSTYSMSST LTLTKDEYER HNSYTCEATH KTSTSPIVKS FNRNE

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Macromolecule #3: 11F9 heavy-chain

MacromoleculeName: 11F9 heavy-chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 25.815039 KDa
SequenceString: MKCSWVIFFL MAVVTGVNSE VQLQQSGAEL VRPGALVKLS CKASGFNIKD YYMHWVKERP EQGLEWIGWI DPENGNTIYD PKFQGKASI TADTSSNTAY LQLSSLTSED TAVYYCARKR GYYGPYFDYW GQGTTLTVSS KTTAPSVYPL APVCGDTTGS S VTLGCLVK ...String:
MKCSWVIFFL MAVVTGVNSE VQLQQSGAEL VRPGALVKLS CKASGFNIKD YYMHWVKERP EQGLEWIGWI DPENGNTIYD PKFQGKASI TADTSSNTAY LQLSSLTSED TAVYYCARKR GYYGPYFDYW GQGTTLTVSS KTTAPSVYPL APVCGDTTGS S VTLGCLVK GYFPEPVTLT WNSGSLSSGV HTFPAVLQSG LYTLSSSVTV TSSTWPSQSI TCNVAHPASS TKVDKKIEPA

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Macromolecule #4: Minihepcidin PR73

MacromoleculeName: Minihepcidin PR73 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 1.736198 KDa
SequenceString:
(SQ6)TH(2GX)(EOE)RCR(3FB)(ACA) (SOW)(SQI)

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Macromolecule #5: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 5 / Number of copies: 2 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM / POPC

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Macromolecule #6: water

MacromoleculeName: water / type: ligand / ID: 6 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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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

Concentration10 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 305 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 162586

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