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Related Experiment Videos

CBP/p300 TAZ1 domain forms a structured scaffold for ligand binding.

Roberto N De Guzman1, Jonathan M Wojciak, Maria A Martinez-Yamout

  • 1Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Biochemistry
|January 12, 2005
PubMed
Summary

The transcriptional coactivator protein CBP and p300 TAZ domains adopt well-defined structures in solution, independent of binding partners. This finding impacts understanding of protein-protein recognition mechanisms.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Transcriptional coactivator proteins CBP and p300 contain homologous zinc-binding TAZ domains crucial for transcription factor interactions.
  • Previous studies suggested isolated p300 TAZ1 domain lacks stable structure, requiring partner binding for folding.

Purpose of the Study:

  • To investigate the structural properties of isolated CBP and p300 TAZ domains in solution.
  • To determine the three-dimensional structure of the isolated CBP TAZ1 domain and compare it to TAZ2.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine the three-dimensional structure of the isolated CBP TAZ1 domain.
  • Structural analysis in the presence and absence of binding partners and stoichiometric Zn(2+).

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Main Results:

  • Both isolated CBP and p300 TAZ domains adopt well-defined structures in solution with Zn(2+), contrary to previous reports.
  • The determined structure of the isolated CBP TAZ1 domain is consistent in the presence and absence of binding partners.
  • A key structural difference was observed in the orientation of the fourth helix between TAZ1 and TAZ2 domains.

Conclusions:

  • The isolated TAZ domains possess inherent structural stability, challenging previous molten globule hypotheses.
  • Structural differences between TAZ1 and TAZ2, particularly the fourth helix orientation, likely dictate binding specificity for distinct transcription factors.
  • This structural insight is critical for understanding the mechanisms of protein-protein recognition in transcriptional regulation.