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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...
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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 dimers that...
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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...
Eukaryotic Transcription Inhibitors01:52

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Cooperative Binding of Transcription Regulators02:13

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...
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Related Experiment Video

Updated: Jun 23, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

Changing the DNA-binding specificity of a repressor.

P Youderian, A Vershon, S Bouvier

    Cell
    |December 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified specific mutations in the Mnt repressor protein that alter its DNA binding specificity. This Salmonella phage P22 repressor now binds a mutated operator more strongly than the original, demonstrating a key change in its genetic recognition.

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    10:44

    In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing

    Published on: May 5, 2023

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • The Mnt repressor from Salmonella phage P22 is crucial for regulating gene expression by binding to a specific operator DNA sequence.
    • Understanding repressor-operator interactions is key to deciphering viral genetic control mechanisms.

    Purpose of the Study:

    • To investigate how specific mutations in the Mnt repressor affect its DNA binding specificity.
    • To identify the amino acid changes responsible for altered binding affinity and specificity.

    Main Methods:

    • Construction of a mutant Mnt binding site with symmetric, operator-constitutive mutations.
    • Selection of Mnt repressor mutants with altered binding preferences.
    • In vitro DNA binding assays using purified wild-type and mutant Mnt proteins.

    Main Results:

    • Mutations in the Mnt repressor's CAC codon (His6 to Pro) resulted in a significant change in DNA binding specificity.
    • Wild-type Mnt binds the wild-type operator strongly but the mutant operator with 1000-fold less affinity.
    • Mutant Mnt proteins exhibited reversed binding affinities, favoring the mutant operator.

    Conclusions:

    • The His6 to Pro substitution in the Mnt repressor is critical for its DNA binding specificity.
    • This study demonstrates how targeted mutations can reprogram repressor-DNA interactions.
    • Findings provide insights into the molecular basis of sequence recognition in phage repressors.