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How transcriptional activators bind target proteins.

S Hermann1, K D Berndt, A P Wright

  • 1Department of Natural Sciences, Södertörns högskola, Box 4101, S-14104 Huddinge, Sweden. Stefan.Hermann@sh.se

The Journal of Biological Chemistry
|August 22, 2001
PubMed
Summary
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The proto-oncogene c-Myc

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • The proto-oncogene c-Myc regulates cellular processes by controlling target genes.
  • c-Myc protein interacts with transcription factors like TATA-binding protein (TBP) via its transactivation domain (TAD).

Purpose of the Study:

  • To investigate the interaction between the c-Myc transactivation domain (TAD) and TATA-binding protein (TBP).
  • To elucidate the mechanism and structural requirements for c-Myc TAD binding to TBP.

Main Methods:

  • Analysis of c-Myc TAD length requirements for TBP binding.
  • Characterization of the kinetic and thermodynamic properties of the c-Myc TAD-TBP interaction.
  • Investigation of the nature of interactions (ionic, polar, hydrophobic) during complex formation.

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Main Results:

  • An extended c-Myc TAD length is necessary for TBP binding, unlike other activators.
  • The c-Myc TAD-TBP interaction is a multi-step process.
  • Initial complex formation involves ionic/polar interactions, followed by a slow, hydrophobic-driven conversion to a stable complex.

Conclusions:

  • The findings reveal specific requirements for c-Myc TAD binding to TBP.
  • A two-stage model (rapid low-affinity, slow high-affinity) describes the interaction.
  • Proposed models offer a universal paradigm for activator-target factor interactions in gene regulation.