Solution structure of Human Pax8 Paired Box Domain

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


The Solution Structure of DNA-free Pax-8 Paired Box Domain Accounts for Redox Regulation of Transcriptional Activity in the Pax Protein Family.

Codutti, L.van Ingen, H.Vascotto, C.Fogolari, F.Corazza, A.Tell, G.Quadrifoglio, F.Viglino, P.Boelens, R.Esposito, G.

(2008) J Biol Chem 283: 33321-33328

  • DOI: https://doi.org/10.1074/jbc.M805717200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Pax-8 is a transcription factor belonging to the PAX genes superfamily and its crucial role has been proven both in embryo and in the adult organism. Pax-8 activity is regulated via a redox-based mechanism centered on the glutathionylation of specific cysteines in the N-terminal region (Cys45 and Cys57). These residues belong to a highly evolutionary conserved DNA binding site: the Paired Box (Prd) domain. Crystallographic protein-DNA complexes of the homologues Pax-6 and Pax-5 showed a bipartite Prd domain consisting of two helix-turn-helix (HTH) motifs separated by an extended linker region. Here, by means of nuclear magnetic resonance, we show for the first time that the HTH motifs are largely defined in the unbound Pax-8 Prd domain. Our findings contrast with previous induced fit models, in which Pax-8 is supposed to largely fold upon DNA binding. Importantly, our data provide the structural basis for the enhanced chemical reactivity of residues Cys45 and Cys57 and explain clinical missense mutations that are not obviously related to the DNA binding interface of the paired box domain. Finally, sequence conservation suggests that our findings could be a general feature of the Pax family transcription factors.

  • Organizational Affiliation

    Dipartimento di Scienze e Tecnologie Biomediche, Università degli Studi di Udine, p.le Kolbe 4, 33100 Udine, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Paired box protein Pax-8159Homo sapiensMutation(s): 0 
Gene Names: PAX8
UniProt & NIH Common Fund Data Resources
Find proteins for Q06710 (Homo sapiens)
Explore Q06710 
Go to UniProtKB:  Q06710
PHAROS:  Q06710
GTEx:  ENSG00000125618 
Entity Groups  
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UniProt GroupQ06710
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-30
    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
  • Version 1.3: 2023-06-14
    Changes: Database references, Other