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Related Concept Videos

Conserved Binding Sites01:49

Conserved Binding Sites

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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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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Ligand Binding Sites02:40

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Ligand Binding and Linkage00:49

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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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Updated: Apr 28, 2026

Application of Biolayer Interferometry BLI for Studying Protein-Protein Interactions in Transcription
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Defining the DNA Binding Specificity of GRHL2.

Paige E Messa1, Christopher L Warren1, Noah R Nicol1

  • 1Proteovista LLC, Madison, WI 53719, USA.

Biorxiv : the Preprint Server for Biology
|April 27, 2026
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Summary

Grainyhead-like 2 (GRHL2) transcription factor binding specificity was mapped using a genomic DNA-binding array. GRHL2 prefers a specific DNA motif, with flanking sequences and dimeric binding influencing its genomic occupancy.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Grainyhead-like 2 (GRHL2) is an epithelial transcription factor with critical roles in development and disease.
  • The precise DNA sequence requirements for GRHL2 binding have not been fully elucidated.
  • Understanding GRHL2 DNA recognition is key to deciphering its regulatory functions.

Purpose of the Study:

  • To comprehensively define the DNA sequence specificity of GRHL2.
  • To investigate the impact of sequence variations and flanking regions on GRHL2 binding affinity.
  • To differentiate direct GRHL2 binding from indirect recruitment at genomic sites.

Main Methods:

  • Utilized a high-density genomic Specificity and Affinity for Protein (SNAP) DNA-binding array with over 770,000 probes.
  • Performed de novo motif analysis on high-affinity probes to identify the canonical GRHL2 binding motif.
  • Integrated SNAP array data with ChIP-seq to analyze GRHL2 binding in an endogenous genomic context.

Main Results:

  • Identified the canonical GRHL2 motif as 5'-AACCGGTT-3'.
  • Revealed sequence specificity landscapes showing tolerance variations at different motif positions and flanking sequences.
  • Demonstrated dimeric GRHL2 binding at paired motifs with specific helical spacing.
  • Differentiated direct GRHL2 binding from cofactor-mediated recruitment.

Conclusions:

  • Established the detailed sequence rules governing GRHL2 DNA recognition.
  • Highlighted the importance of flanking sequences and dimeric interactions in GRHL2 binding.
  • Provided a framework for understanding GRHL2's context-dependent regulatory roles in the genome.