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Related Concept Videos

Eukaryotic Transcription Activators02:42

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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Related Experiment Video

Updated: May 2, 2026

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
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Structural basis of Ets1 activation by Runx1.

T Shrivastava1, K Mino1, N D Babayeva1

  • 1Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA.

Leukemia
|March 21, 2014
PubMed
Summary

Runx1 transcription factor directly interacts with Ets1, activating its DNA-binding domain. This novel mechanism explains how Runx1 regulates gene expression, even in inhibited Ets1 forms, impacting hematopoiesis and leukemia.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Hematopoiesis

Background:

  • Runx1 is crucial for definitive hematopoiesis and is implicated in leukemia development.
  • Runx1 regulates gene expression through activation of Ets1 on composite DNA elements.
  • The structural basis for Ets1 activation by Runx1 has not been elucidated.

Purpose of the Study:

  • To determine the crystal structure of the Runx1-Ets1-DNA complex.
  • To elucidate the structural mechanism of Ets1 activation by Runx1.
  • To investigate the role of direct Ets1•Runx1 interaction in transcriptional regulation.

Main Methods:

  • X-ray crystallography of the ternary complex (Runx1, Ets1, TCRα enhancer DNA).
  • Structure-guided mutagenesis of Runx1.
  • DNA-binding and transcriptional assays.

Main Results:

  • The crystal structure revealed Runx1 binding to Ets1's DNA-binding domain, displacing an autoinhibitory module.
  • This interaction represents a novel mechanism for Ets1 activation.
  • Mutational studies confirmed the critical role of direct Ets1•Runx1 interaction in activating both wild-type and phosphorylated Ets1.

Conclusions:

  • Direct interaction between Runx1 and Ets1 is essential for Ets1 activation.
  • This mechanism explains how Runx1 effectively activates Ets1, including inhibited forms.
  • Findings provide insights into the regulation of hematopoiesis and potential therapeutic targets in leukemia.