2KAK

Solution structure of the beta-E-domain of wheat Ec-1 metallothionein


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The beta(E)-domain of wheat E(c)-1 metallothionein: a metal-binding domain with a distinctive structure.

Peroza, E.A.Schmucki, R.Guntert, P.Freisinger, E.Zerbe, O.

(2009) J Mol Biol 387: 207-218

  • DOI: 10.1016/j.jmb.2009.01.035
  • Primary Citation of Related Structures:  
    2KAK

  • PubMed Abstract: 
  • Metallothioneins (MTs) are ubiquitous cysteine-rich proteins with a high affinity for divalent metal ions such as Zn(II), Cu(I), and Cd(II) that are involved in metal ion homeostasis and detoxification, as well as protection against reactive oxygen species ...

    Metallothioneins (MTs) are ubiquitous cysteine-rich proteins with a high affinity for divalent metal ions such as Zn(II), Cu(I), and Cd(II) that are involved in metal ion homeostasis and detoxification, as well as protection against reactive oxygen species. Here we show the NMR solution structure of the beta(E)-domain of the early cysteine-labeled protein (E(c)-1) from wheat (beta(E)-E(c)-1), which represents the first three-dimensional structure of a plant MT. The beta(E)-domain comprises the 51 C-terminal residues of E(c)-1 and exhibits a distinctive unprecedented structure with two separate metal-binding centers, a mononuclear Zn(II) binding site constituted by two cysteine and two highly conserved histidine residues as found in certain zinc-finger motifs, and a cluster formed by three Zn(II) ions coordinated by nine Cys residues that resembles the cluster in the beta-domain of vertebrate MTs. Cys-metal ion connectivities were determined by exhaustive structure calculations for all 7560 possible configurations of the three-metal cluster. Backbone dynamics investigated by (15)N relaxation experiments support the results of the structure determination in that beta(E)-E(c)-1 is a rigidly folded polypeptide. To further investigate the influence of metal ion binding on the stability of the structure, we replaced Zn(II) with Cd(II) ions and examined the effects of metal ion release on incubation with a metal ion chelator.


    Organizational Affiliation

    Institute of Inorganic Chemistry, University of Zürich, Zürich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EC protein I/IIA53Triticum aestivumMutation(s): 0 
UniProt
Find proteins for P30569 (Triticum aestivum)
Explore P30569 
Go to UniProtKB:  P30569
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UniProt GroupP30569
Protein Feature View
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  • Reference Sequence
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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 2KAK Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-02-19
    Changes: Data collection, Database references, Derived calculations, Other