1S5Q

Solution Structure of Mad1 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.

    Related Citations: 
    • Solution Structure of the Interacting Domains of the Mad-Sin3 Complex: Implications for Recruitment of a Chromatin-Modifying Complex
      Brubaker, K.,Cowley, S.M.,Huang, K.,Loo, L.,Yochum, G.S.,Ayer, D.E.,Eisenman, R.N.,Radhakrishnan, I.
      (2000) Cell 103: 655

    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
MAD protein
A
16Homo sapiensGene Names: MXD1 (MAD)
Find proteins for Q05195 (Homo sapiens)
Go to Gene View: MXD1
Go to UniProtKB:  Q05195
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sin3a protein
B
89Mus musculusGene 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: 1S5Q Olderado

Structure Validation

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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