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Related Experiment Videos

Auto-inhibition and partner proteins, core-binding factor beta (CBFbeta) and Ets-1, modulate DNA binding by CBFalpha2

T L Gu1, T L Goetz, B J Graves

  • 1Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.

Molecular and Cellular Biology
|December 14, 1999
PubMed
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Core-binding factor alpha2 (CBFalpha2) regulation involves intramolecular inhibition and positive modulation by CBFbeta and Ets-1, impacting its DNA binding crucial for development.

Area of Science:

  • Molecular Biology
  • Transcription Factor Regulation
  • Developmental Biology

Background:

  • Core-binding factor alpha2 (CBFalpha2), also known as AML1 or PEBP2alphaB, is a key DNA-binding subunit of core-binding factors (CBFs).
  • CBFs are heterodimeric transcription factors essential for mammalian development, including hematopoiesis and bone formation.
  • CBFalpha2's Runt domain mediates DNA binding and heterodimerization with the CBFbeta subunit.

Purpose of the Study:

  • To quantify and compare the cooperative DNA binding of CBFalpha2 with its partners CBFbeta and Ets-1.
  • To identify auto-inhibitory sequences within CBFalpha2 and regulatory sequences influencing its interactions.
  • To elucidate the mechanisms of positive and negative regulation governing CBFalpha2's DNA-binding activity.

Main Methods:

Related Experiment Videos

  • Quantification of protein-protein interactions and DNA binding affinities.
  • Identification of regulatory sequences through deletion analysis.
  • Comparative analysis of cooperative DNA binding under different partnership conditions.

Main Results:

  • CBFalpha2 contains auto-inhibitory sequences within its Runt domain and C-terminal regions (after amino acid 214).
  • CBFbeta significantly enhances CBFalpha2 DNA binding (approx. 40-fold) by relieving intramolecular inhibition.
  • Ets-1 stimulates CBFalpha2 DNA binding (7- to 10-fold), with specific N-terminal and internal sequences required for this cooperation.

Conclusions:

  • CBFalpha2 activity is tightly regulated by intramolecular negative feedback and positive allosteric modulation by CBFbeta and Ets-1.
  • CBFbeta and Ets-1 act as alternative partners, differentially regulating CBFalpha2's DNA binding and heterodimerization.
  • Understanding these regulatory partnerships provides insights into the precise control of gene expression during mammalian development.