5AYM

Crystal structure of a bacterial homologue of iron transporter ferroportin in outward-facing state with soaked iron


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Outward- and inward-facing structures of a putative bacterial transition-metal transporter with homology to ferroportin

Taniguchi, R.Kato, H.E.Font, J.Deshpande, C.N.Wada, M.Ito, K.Ishitani, R.Jormakka, M.Nureki, O.

(2015) Nat Commun 6: 8545-8545

  • DOI: 10.1038/ncomms9545
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In vertebrates, the iron exporter ferroportin releases Fe(2+) from cells into plasma, thereby maintaining iron homeostasis. The transport activity of ferroportin is suppressed by the peptide hormone hepcidin, which exhibits upregulated expression in ...

    In vertebrates, the iron exporter ferroportin releases Fe(2+) from cells into plasma, thereby maintaining iron homeostasis. The transport activity of ferroportin is suppressed by the peptide hormone hepcidin, which exhibits upregulated expression in chronic inflammation, causing iron-restrictive anaemia. However, due to the lack of structural information about ferroportin, the mechanisms of its iron transport and hepcidin-mediated regulation remain largely elusive. Here we report the crystal structures of a putative bacterial homologue of ferroportin, BbFPN, in both the outward- and inward-facing states. Despite undetectable sequence similarity, BbFPN adopts the major facilitator superfamily fold. A comparison of the two structures reveals that BbFPN undergoes an intra-domain conformational rearrangement during the transport cycle. We identify a substrate metal-binding site, based on structural and mutational analyses. Furthermore, the BbFPN structures suggest that a predicted hepcidin-binding site of ferroportin is located within its central cavity. Thus, BbFPN may be a valuable structural model for iron homeostasis regulation by ferroportin.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Solute carrier family 39 (Iron-regulated transporter)
A
440Bdellovibrio bacteriovorus (strain ATCC 15356 / DSM 50701 / NCIB 9529 / HD100)Mutation(s): 0 
Gene Names: slc39
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Major Facilitator Superfamily (MFS) Transporters
Protein: 
Ferroportin (FPN) Fe2+ transporter (SLC40A1) analog, outward-facing conformation
Find proteins for Q6MLJ0 (Bdellovibrio bacteriovorus (strain ATCC 15356 / DSM 50701 / NCIB 9529 / HD100))
Go to UniProtKB:  Q6MLJ0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE2
Query on FE2

Download SDF File 
Download CCD File 
A
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 57.080α = 90.00
b = 86.170β = 90.00
c = 96.710γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-11-04
    Type: Initial release