2F05

Solution structure of free PAH2 domain of mSin3B


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Role of Structural and Dynamical Plasticity in Sin3: The Free PAH2 Domain is a Folded Module in mSin3B

van Ingen, H.Baltussen, M.A.Aelen, J.Vuister, G.W.

(2006) J.Mol.Biol. 358: 485-497

  • DOI: 10.1016/j.jmb.2006.01.100

  • PubMed Abstract: 
  • The co-repressor Sin3 is the essential scaffold protein of the Sin3/HDAC co-repressor complex, which is recruited to the DNA by a diverse group of transcriptional repressors, targeting genes involved in the regulation of the cell cycle, proliferation ...

    The co-repressor Sin3 is the essential scaffold protein of the Sin3/HDAC co-repressor complex, which is recruited to the DNA by a diverse group of transcriptional repressors, targeting genes involved in the regulation of the cell cycle, proliferation and differentiation. Sin3 contains four repeats commonly denoted as paired amphipathic helix (PAH1-4) domains that provide the principal interaction surface for various repressors. Here, we present the first structure of the free state of the PAH2 domain and discuss its implications for interaction with the repressors. The unbound conformation is very similar to the conformation observed when bound to either the Mad1 or HBP1 repressor, suggesting that the PAH2 domain serves as a template that guides proper folding of the unstructured repressor. The free PAH2 domain shows micro- to millisecond conformational exchange between the folded, major state and a partially unfolded, minor state. Upon complex formation, we observe a significant decrease in fast time-scale flexibility of local regions of the protein, correlated with the formation of intermolecular contacts, and an overall decrease in the slow time-scale conformational exchange. On the basis of our data and using a multiple sequence alignment of all PAH domains, we suggest that the PAH1, PAH2 and PAH3 domains form pre-folded binding modules in full-length Sin3 like beads-on-a-string, and act as folding templates for the interaction domains of their targets.


    Organizational Affiliation

    Department of Physical Chemistry/Biophysical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, the Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Paired amphipathic helix protein Sin3b
A
105Mus musculusMutation(s): 0 
Gene Names: Sin3b (Kiaa0700)
Find proteins for Q62141 (Mus musculus)
Go to UniProtKB:  Q62141
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2F05 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-03-28
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance