1XF7

High Resolution NMR Structure of the Wilms' Tumor Suppressor Protein (WT1) Finger 3


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 40 
  • 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

Why zinc fingers prefer zinc: ligand-field symmetry and the hidden thermodynamics of metal ion selectivity

Lachenmann, M.J.Ladbury, J.E.Dong, J.Huang, K.Carey, P.Weiss, M.A.

(2004) Biochemistry 43: 13910-13925

  • DOI: 10.1021/bi0491999

  • PubMed Abstract: 
  • The zinc finger, a motif of protein-nucleic acid recognition broadly conserved among eukaryotes, is a globular minidomain containing a tetrahedral metal-binding site. Preferential coordination of Zn(2+) (relative to Co(2+)) is proposed to reflect dif ...

    The zinc finger, a motif of protein-nucleic acid recognition broadly conserved among eukaryotes, is a globular minidomain containing a tetrahedral metal-binding site. Preferential coordination of Zn(2+) (relative to Co(2+)) is proposed to reflect differences in ligand-field stabilization energies (LFSEs) due to complete or incomplete occupancy of d orbitals. LFSE predicts that the preference for Zn(2+) should be purely enthalpic in accord with calorimetric studies of a high-affinity consensus peptide (CP-1; Blasie, C. A., and Berg, J. (2002) Biochemistry 41, 15068-73). Despite its elegance, the general predominance of LFSE is unclear as (i) the magnitude by which CP-1 prefers Zn(2+) is greater than that expected and (ii) the analogous metal ion selectivity of a zinc metalloenzyme (carbonic anhydrase) is driven by changes in entropy rather than enthalpy. Because CP-1 was designed to optimize zinc binding, we have investigated the NMR structure and metal ion selectivity of a natural finger of lower stability derived from human tumor-suppressor protein WT1. Raman spectroscopy suggests that the structure of the WT1 domain is unaffected by interchange of Zn(2+) and Co(2+). As in CP-1, preferential binding of Zn(2+) (relative to Co(2+)) is driven predominantly by differences in enthalpy, but in this case the enthalpic advantage is less than that predicted by LFSE. A theoretical framework is presented to define the relationship between LFSE and other thermodynamic factors, such as metal ion electroaffinities, enthalpies of hydration, and the topography of the underlying folding landscape. The contribution of environmental coupling to entropy-enthalpy compensation is delineated in a formal thermodynamic cycle. Together, these considerations indicate that LFSE provides an important but incomplete description of the stringency and thermodynamic origin of metal-ion selectivity.


    Organizational Affiliation

    Department of Biochemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-4935, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Wilms' Tumor Protein
A
29Homo sapiensMutation(s): 2 
Gene Names: WT1
Find proteins for P19544 (Homo sapiens)
Go to Gene View: WT1
Go to UniProtKB:  P19544
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 1XF7 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-12-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance