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 
  • R-Value Observed: 0.212 

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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
  • Primary Citation of Related Structures:  
    4X82

  • 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 critical role of the ECD is manifested by disease-causing mutations on ZIP4, a representative LIV-1 protein ...

    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 Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Zinc transporter ZIP4B [auth A], A [auth B]287Pteropus alectoMutation(s): 0 
Gene Names: PAL_GLEAN10010497
Find proteins for L5KLU7 (Pteropus alecto)
Explore L5KLU7 
Go to UniProtKB:  L5KLU7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.212 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.182α = 90
b = 68.731β = 95.79
c = 93.971γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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