1PD7: Extended SID of Mad1 bound to the PAH2 domain of mSin3B

Sin3 forms the scaffold for a multiprotein corepressor complex that silences transcription via the action of histone deacetylases. Sin3 is recruited to the DNA by several DNA binding repressors, such as the helix-loop-helix proteins of the Mad family. Here, we elaborate on the Mad-Sin3 interaction based on a binding study, solution structure, and dynamics of the PAH2 domain of mSin3 in complex to an extended Sin3 interacting domain (SID) of 24 residues of Mad1. We show that SID residues Met7 and Glu23, outside the previously defined minimal binding motif, mediate additional hydrophobic and electrostatic interactions with PAH2. On the basis of these results we propose an extended consensus sequence describing the PAH2-SID interaction specifically for the Mad family, showing that residues outside the hydrophobic core of the SID interact with PAH2 and modulate binding affinity to appropriate levels.
PDB ID: 1PD7Download
MMDB ID: 26076
PDB Deposition Date: 2003/5/19
Updated in MMDB: 2007/11
Experimental Method:
solution nmr
Source Organism:
Mus musculus
Similar Structures:
Molecular Components in 1PD7
Label Count Molecule
Proteins (2 molecules)
Sin3b Protein(Gene symbol: Sin3b)
Molecule annotation
Mad1(Gene symbol: MXD1)
Molecule annotation
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Citing MMDB