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Related Concept Videos

Conserved Binding Sites01:49

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries
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Low affinity binding site clusters confer hox specificity and regulatory robustness.

Justin Crocker1, Namiko Abe2, Lucrezia Rinaldi2

  • 1Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, VA 20147, USA.

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|January 6, 2015
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Summary

Hox proteins like Ultrabithorax (Ubx) achieve specific gene regulation in Drosophila by binding to clusters of low-affinity DNA sites in enhancers. This enhancer architecture ensures robust gene expression across variable environments.

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Area of Science:

  • Developmental biology
  • Genetics
  • Molecular biology

Background:

  • Hox transcription factors are crucial for establishing animal body plan regional identity.
  • A key paradox is how Hox proteins, which bind similar DNA sequences in vitro, confer specific anatomical identities.
  • Understanding the regulatory mechanisms of Hox gene function is essential for developmental biology.

Purpose of the Study:

  • To investigate how the Hox protein Ultrabithorax (Ubx), in complex with Extradenticle (Exd), achieves specific DNA binding and gene regulation.
  • To elucidate the role of low-affinity binding sites within enhancers in conferring specificity and robustness to Hox gene function.
  • To examine the evolutionary conservation of enhancer architecture and its impact on gene expression.

Main Methods:

  • Analysis of Ultrabithorax (Ubx) and Extradenticle (Exd) protein binding to low-affinity DNA sites in Drosophila shavenbaby gene enhancers.
  • In vivo studies to assess the specificity and robustness of enhancer function under varying environmental conditions.
  • Comparative analysis of individual binding site conservation versus overall enhancer architecture conservation.

Main Results:

  • Ubx-Exd complexes specifically bind to clusters of very low affinity sites in the shavenbaby gene enhancers.
  • These low-affinity sites confer in vivo specificity for Ubx binding.
  • Multiple clustered sites are necessary for robust shavenbaby expression in variable environments.
  • While individual binding sites are not conserved, the clustered enhancer architecture is maintained and essential for function.

Conclusions:

  • Enhancer architecture, specifically clusters of low-affinity binding sites, is critical for achieving specific and robust Hox gene expression.
  • Natural selection acts at the enhancer level, favoring specific densities of low-affinity sites for precise developmental outcomes.
  • The study resolves the paradox of Hox protein specificity by highlighting the importance of binding site arrangement and affinity in regulatory elements.