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Conserved Binding Sites

Conserved Binding Sites

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.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

Conserved Binding Sites

Conserved Binding Sites

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.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

Ligand Binding Sites

Ligand Binding Sites

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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

Single-Strand DNA Binding Proteins

Single-Strand DNA Binding Proteins

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...

Cooperative Binding of Transcription Regulators

Cooperative Binding of Transcription Regulators

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 dimers that...

Labeling DNA Probes

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Related Experiment Video

Updated: Jun 16, 2026

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy

Published on: February 7, 2019

Specificity landscapes of DNA binding molecules elucidate biological function.

Clayton D Carlson¹, Christopher L Warren, Karl E Hauschild

¹Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA.

Proceedings of the National Academy of Sciences of the United States of America

|February 24, 2010

Summary

Synthetic DNA binders match or exceed eukaryotic protein specificity, revealing sequence context is key for genome-wide binding landscapes (genomescapes). This accelerates DNA therapeutics and understanding DNA binding specificity.

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Area of Science:

Genomics
Molecular Biology
Bioengineering

Background:

Deciphering gene regulatory networks and engineering DNA-targeting molecules is challenging due to difficulties in evaluating DNA binding molecule specificity.
Understanding the precise sequence specificities of DNA binding molecules is crucial for both biological research and therapeutic development.

Purpose of the Study:

To compare the DNA sequence specificities of various proteins and engineered DNA binding molecules across the entire sequence space.
To develop and utilize an interactive "specificity landscape" for visualizing and interpreting high-content binding data.
To explore the impact of sequence context on DNA binding energetics and its application in genome-wide binding predictions.

Main Methods:

High-throughput screening of DNA sequence specificities for diverse DNA binding molecules.
Development of an interactive "specificity landscape" visualization tool to analyze affinity and specificity across millions of DNA sequences.
Generation of predictive genome-wide binding landscapes (genomescapes) by incorporating context-dependent binding values.

Main Results:

Specificity landscapes demonstrate that synthetic DNA ligands achieve specificities comparable to or exceeding those of eukaryotic DNA binding proteins.
Identified differential specificity constraints imposed by various structural folds of natural and synthetic DNA binders.
Confirmed that the sequence context of a binding site significantly influences binding energetics, enabling more accurate genome-wide regulatory element annotation.

Conclusions:

The developed "specificity landscape" and "genomescape" approaches provide powerful tools for analyzing DNA binding specificities.
Synthetic DNA binding molecules show high potential for precision applications, matching or surpassing natural protein specificities.
This work accelerates the development of DNA therapeutics and deepens the understanding of sequence-specific DNA-protein interactions.