4X82

Crystal Structure of the Extracellular Domain of ZIP4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insights of ZIP4 extracellular domain critical for optimal zinc transport.

Zhang, T.Sui, D.Hu, J.

(2016) Nat Commun 7: 11979-11979

  • DOI: 10.1038/ncomms11979

  • PubMed Abstract: 
  • The ZIP zinc transporter family is responsible for zinc uptake from the extracellular milieu or intracellular vesicles. The LIV-1 subfamily, containing nine out of the 14 human ZIP proteins, is featured with a large extracellular domain (ECD). The cr ...

    The ZIP zinc transporter family is responsible for zinc uptake from the extracellular milieu or intracellular vesicles. The LIV-1 subfamily, containing nine out of the 14 human ZIP proteins, is featured with a large extracellular domain (ECD). The critical role of the ECD is manifested by disease-causing mutations on ZIP4, a representative LIV-1 protein. Here we report the first crystal structure of a mammalian ZIP4-ECD, which reveals two structurally independent subdomains and an unprecedented dimer centred at the signature PAL motif. Structure-guided mutagenesis, cell-based zinc uptake assays and mapping of the disease-causing mutations indicate that the two subdomains play pivotal but distinct roles and that the bridging region connecting them is particularly important for ZIP4 function. These findings lead to working hypotheses on how ZIP4-ECD exerts critical functions in zinc transport. The conserved dimeric architecture in ZIP4-ECD is also demonstrated to be a common structural feature among the LIV-1 proteins.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Zinc transporter ZIP4
B, A
287Pteropus alectoMutation(s): 0 
Find proteins for L5KLU7 (Pteropus alecto)
Go to UniProtKB:  L5KLU7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 34.182α = 90.00
b = 68.731β = 95.79
c = 93.971γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALEPACKdata scaling
REFMACrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-06-15
    Type: Initial release
  • Version 1.1: 2017-10-18
    Type: Database references, Derived calculations