Macromolecule Content

• Total Structure Weight: 17447.94 
• Atom Count: 1225 
• Residue Count: 159 
• Unique protein chains: 1

2K27

Solution structure of Human Pax8 Paired Box Domain

• DOI: 10.2210/pdb2K27/pdb
• BMRB: 15693

• Classification: TRANSCRIPTION REGULATOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2008-03-26 Released: 2008-09-30 
• Deposition Author(s): Codutti, L., Esposito, G., Corazza, A., Fogolari, F., Tell, G., Vascotto, C., van Ingen, H., Boelens, R., Viglino, P., Quadrifoglio, F.

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Experimental Data Snapshot

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

Literature

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

• PubMed: 18829450 
• DOI: 10.1074/jbc.M805717200


• 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Paired box protein Pax-8	A	159	Homo sapiens	Mutation(s): 0  Gene Names: PAX8
Find proteins for Q06710 (Homo sapiens) Go to Gene View: PAX8 Go to UniProtKB:  Q06710

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 300 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• Olderado: 2K27 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-03-26 
• Released Date: 2008-09-30 
• Deposition Author(s): Codutti, L., Esposito, G., Corazza, A., Fogolari, F., Tell, G., Vascotto, C., van Ingen, H., Boelens, R., Viglino, P., Quadrifoglio, F.

Revision History 

• Version 1.0: 2008-09-30
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Version format compliance