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- PDB-8dl6: Cryo-EM structure of human ferroportin/slc40 bound to Ca2+ in nanodisc -

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Basic information

Entry
Database: PDB / ID: 8dl6
TitleCryo-EM structure of human ferroportin/slc40 bound to Ca2+ in nanodisc
Components
  • 11F9 heavy-chain
  • 11F9 light-chain
  • Solute carrier family 40 member 1
KeywordsMEMBRANE PROTEIN / SLC40 / Fpn / ferroportin / iron transporter / calcium / Ca2+ / human / nanodisc
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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsShen, J. / Wilbon, A.S. / Pan, Y. / Zhou, M.
Funding support United States, 4items
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: Elife / Year: 2023
Title: Mechanism of Ca transport by ferroportin.
Authors: Jiemin Shen / Azaan Saalim Wilbon / Ming Zhou / Yaping Pan /
Abstract: Ferroportin (Fpn) is a transporter that releases ferrous ion (Fe) from cells and is important for homeostasis of iron in circulation. Export of one Fe by Fpn is coupled to import of two H to maintain ...Ferroportin (Fpn) is a transporter that releases ferrous ion (Fe) from cells and is important for homeostasis of iron in circulation. Export of one Fe by Fpn is coupled to import of two H to maintain charge balance. Here, we show that human Fpn (HsFpn) binds to and mediates Ca transport. We determine the structure of Ca-bound HsFpn and identify a single Ca binding site distinct from the Fe binding sites. Further studies validate the Ca binding site and show that Ca transport is not coupled to transport of another ion. In addition, Ca transport is significantly inhibited in the presence of Fe but not vice versa. Function of Fpn as a Ca uniporter may allow regulation of iron homeostasis by Ca.
History
DepositionJul 7, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 25, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Solute carrier family 40 member 1
C: 11F9 light-chain
D: 11F9 heavy-chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)112,7364
Polymers112,6963
Non-polymers401
Water181
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Solute carrier family 40 member 1 / Ferroportin-1 / Iron-regulated transporter 1


Mass: 63386.621 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC40A1, FPN1, IREG1, SLC11A3, MSTP079 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9NP59
#2: Antibody 11F9 light-chain


Mass: 23493.885 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)
#3: Antibody 11F9 heavy-chain


Mass: 25815.039 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)
#4: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY

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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

ComponentName: Cryo-EM structure of human ferroportin/slc40 bound to Ca2+ in nanodisc
Type: COMPLEX / Entity ID: #1-#3 / Source: MULTIPLE SOURCES
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 305 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: SPOT SCAN
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 437959 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0136303
ELECTRON MICROSCOPYf_angle_d0.8718604
ELECTRON MICROSCOPYf_dihedral_angle_d4.253925
ELECTRON MICROSCOPYf_chiral_restr0.0431035
ELECTRON MICROSCOPYf_plane_restr0.0061091

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