1S5R

Solution Structure of HBP1 SID-mSin3A PAH2 Complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: The submitted conformers are the 20 structures with the lowest restraint energies, restraint violations, and RMS deviations from ideal covalent geometry. 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

HBP1 and Mad1 repressors bind the Sin3 corepressor PAH2 domain with opposite helical orientations.

Swanson, K.A.Knoepfler, P.S.Huang, K.Kang, R.S.Cowley, S.M.Laherty, C.D.Eisenman, R.N.Radhakrishnan, I.

(2004) Nat.Struct.Mol.Biol. 11: 738-746

  • DOI: 10.1038/nsmb798
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Recruitment of the histone deacetylase (HDAC)-associated Sin3 corepressor is an obligatory step in many eukaryotic gene silencing pathways. Here we show that HBP1, a cell cycle inhibitor and regulator of differentiation, represses transcription in a ...

    Recruitment of the histone deacetylase (HDAC)-associated Sin3 corepressor is an obligatory step in many eukaryotic gene silencing pathways. Here we show that HBP1, a cell cycle inhibitor and regulator of differentiation, represses transcription in a HDAC/Sin3-dependent manner by targeting the mammalian Sin3A (mSin3A) PAH2 domain. HBP1 is unrelated to the Mad1 repressor for which high-resolution structures in complex with PAH2 have been described. We show that like Mad1, the HBP1 transrepression domain binds through a helical structure to the hydrophobic cleft of mSin3A PAH2. Notably, the HBP1 helix binds PAH2 in a reversed orientation relative to Mad1 and, equally unexpectedly, this is correlated with a chain reversal of the minimal Sin3 interaction motifs. These results not only provide insights into how multiple, unrelated transcription factors recruit the same coregulator, but also have implications for how sequence similarity searches are conducted.


    Organizational Affiliation

    Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, Illinois 60208-3500, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
high mobility group box transcription factor 1
A
23Mus musculusMutation(s): 0 
Gene Names: Hbp1
Find proteins for Q8R316 (Mus musculus)
Go to UniProtKB:  Q8R316
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sin3a protein
B
89Mus musculusMutation(s): 0 
Gene Names: Sin3a (Kiaa4126)
Find proteins for Q60520 (Mus musculus)
Go to UniProtKB:  Q60520
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: The submitted conformers are the 20 structures with the lowest restraint energies, restraint violations, and RMS deviations from ideal covalent geometry. 
  • Olderado: 1S5R Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-07-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance