Tetramerization domain of the Ciona intestinalis p53/p73-b transcription factor protein

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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This is version 1.2 of the entry. See complete history


Structural investigations of the p53/p73 homologs from the tunicate species Ciona intestinalis reveal the sequence requirements for the formation of a tetramerization domain.

Heering, J.Jonker, H.R.Lohr, F.Schwalbe, H.Dotsch, V.

(2016) Protein Sci 25: 410-422

  • DOI: https://doi.org/10.1002/pro.2830
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Most members of the p53 family of transcription factors form tetramers. Responsible for determining the oligomeric state is a short oligomerization domain consisting of one β-strand and one α-helix. With the exception of human p53 all other family members investigated so far contain a second α-helix as part of their tetramerization domain. Here we have used nuclear magnetic resonance spectroscopy to characterize the oligomerization domains of the two p53-like proteins from the tunicate Ciona intestinalis, representing the closest living relative of vertebrates. Structure determination reveals for one of the two proteins a new type of packing of this second α-helix on the core domain that was not predicted based on the sequence, while the other protein does not form a second helix despite the presence of crucial residues that are conserved in all other family members that form a second helix. By mutational analysis, we identify a proline as well as large hydrophobic residues in the hinge region between both helices as the crucial determinant for the formation of a second helix.

  • Organizational Affiliation

    Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, D-60438 Frankfurt/Main, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription factor protein
A, B, C, D
47Ciona intestinalisMutation(s): 0 
Gene Names: Ci-p53/p73-b
Find proteins for F6SSG7 (Ciona intestinalis)
Explore F6SSG7 
Go to UniProtKB:  F6SSG7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF6SSG7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-28
    Type: Initial release
  • Version 1.1: 2016-02-10
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other