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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...

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...

Co-activators and Co-repressors

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...

Co-activators and Co-repressors

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...

RNA Polymerase II Accessory Proteins

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

Nucleosome Remodeling

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...

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Related Experiment Video

Updated: Jun 23, 2026

CD Spectroscopy to Study DNA-Protein Interactions

CD Spectroscopy to Study DNA-Protein Interactions

Published on: February 10, 2022

Arc-repressor dimerization on DNA: folding rate enhancement by colocalization.

Amir Marcovitz¹, Yaakov Levy

¹Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.

Biophysical Journal

|May 20, 2009

Summary

DNA binding accelerates Arc repressor protein refolding by promoting monomer colocalization. Shorter DNA fragments (30 bp) are most effective, while longer or single-stranded DNA influences folding rates differently, highlighting DNA

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Last Updated: Jun 23, 2026

CD Spectroscopy to Study DNA-Protein Interactions

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Published on: February 10, 2022

Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes

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CRISPR-Mediated Reorganization of Chromatin Loop Structure

CRISPR-Mediated Reorganization of Chromatin Loop Structure

Published on: September 14, 2018

Area of Science:

Biophysics
Computational Biology
Molecular Biology

Background:

Multimeric proteins regulate cellular processes through combinatorial control.
Dimeric transcription factors binding DNA are key to eukaryotic gene expression.
Arc-repressor refolding is enhanced by DNA and polyanions.

Purpose of the Study:

Investigate Arc repressor dimerization on DNA for microscopic insights.
Understand advantages of DNA complex formation over monomeric proteins.
Examine Arc monomer assembly kinetics with single- and double-stranded DNA (ssDNA/dsDNA).

Main Methods:

Computational coarse-grained model simulating protein dynamics.
Electrostatic forces dictating protein-DNA interactions.
Analysis of Arc monomer assembly in low-salt environments.

Main Results:

Electrostatic interactions with dsDNA colocalize unfolded Arc monomers, accelerating refolding.
Arc monomers bind dsDNA nonspecifically, using 1D diffusion for dimerization.
Optimal refolding observed with 30 bp DNA; longer DNA reduces efficiency due to poor colocalization.
ssDNA leads to faster Arc folding than dsDNA of equivalent length due to enhanced colocalization.

Conclusions:

DNA colocalization is crucial for accelerating biological self-assembly processes.
ssDNA and dsDNA differentially impact Arc refolding rates, cooperativity, and transition states.
Microscopic insights into DNA-mediated protein assembly dynamics.