1SB0

Solution structure of the KIX domain of CBP bound to the transactivation domain of c-Myb


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • 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

Solution Structure of the KIX Domain of CBP Bound to the Transactivation Domain of c-Myb

Zor, T.De Guzman, R.N.Dyson, H.J.Wright, P.E.

(2004) J.Mol.Biol. 337: 521-534

  • DOI: 10.1016/j.jmb.2004.01.038

  • PubMed Abstract: 
  • The hematopoietic transcription factor c-Myb activates transcription of target genes through direct interactions with the KIX domain of the co-activator CBP. The solution structure of the KIX domain in complex with the activation domain of c-Myb reve ...

    The hematopoietic transcription factor c-Myb activates transcription of target genes through direct interactions with the KIX domain of the co-activator CBP. The solution structure of the KIX domain in complex with the activation domain of c-Myb reveals a helical structure very similar to that adopted by KIX in complex with the phosphorylated kinase inducible domain (pKID) of CREB. While pKID contains two helices, alphaA and alphaB, which interact with KIX, the structure of bound c-Myb reveals a single bent amphipathic helix that binds in the same hydrophobic groove as the alphaB helix of pKID. The affinity of c-Myb for KIX is lower than that of pKID, and relies more heavily on optimal interactions of the single helix of c-Myb with residues in the hydrophobic groove. In particular, a deep hydrophobic pocket in KIX accounts for more than half the interactions with c-Myb observed by NMR. A bend in the alpha-helix of c-Myb enables a critical leucine side-chain to penetrate into this pocket more deeply than the equivalent leucine residue of pKID. The components that mediate the higher affinity of pKID for KIX, i.e. the phosphate group and the alphaA helix, are absent from c-Myb. Results from isothermal titration calorimetry, together with the structural data, point to a key difference between the two complexes in optimal pH for binding, as a result of differential pH-dependent interactions with histidine residues of KIX. These results explain the structural and thermodynamic basis for the observed constitutive versus inducible activation properties of c-Myb and CREB.


    Organizational Affiliation

    Department of Molecular Biology and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
protein CBP
A
87Mus musculusMutation(s): 0 
Gene Names: Crebbp (Cbp)
EC: 2.3.1.48
Find proteins for P45481 (Mus musculus)
Go to UniProtKB:  P45481
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
protein c-Myb
B
25Mus musculusMutation(s): 0 
Gene Names: Myb
Find proteins for P06876 (Mus musculus)
Go to UniProtKB:  P06876
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1SB0 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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