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Transcriptional Regulators definitions

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  • Transcriptional Regulator
    Protein that modulates gene expression by interacting with DNA and other proteins to activate or repress transcription.
  • Promoter
    DNA sequence near a gene where RNA polymerase and general transcription factors assemble to initiate transcription.
  • Enhancer
    Distant DNA element that, when bound by activators, loops to promoters to boost transcription of specific genes.
  • Silencer
    Regulatory DNA sequence, often far from a gene, where repressors bind to inhibit transcription by looping to the promoter.
  • Insulator
    DNA element that blocks enhancers from activating genes in neighboring chromosomal regions, ensuring regulatory specificity.
  • Gene Control Region
    Entire stretch of DNA containing all regulatory elements, including promoters, enhancers, silencers, and insulators, for a gene.
  • Coactivator
    Protein that assists activators in stimulating transcription, often by interacting with RNA polymerase or modifying chromatin.
  • Corepressor
    Protein that partners with repressors to inhibit transcription, frequently by altering chromatin or blocking activator function.
  • Mediator
    Large protein complex that bridges transcriptional regulators and RNA polymerase, coordinating activation or repression.
  • Helix-Turn-Helix
    DNA binding motif with two alpha helices, one contacting DNA and the other stabilizing the interaction, common in Hox genes.
  • Zinc Finger
    DNA binding motif stabilized by zinc ions, formed by repeats of cysteine and histidine, folding into a finger-like structure.
  • Leucine Zipper
    DNA binding motif with two alpha helices that dimerize, resembling a zipper, enabling DNA interaction.
  • Helix-Loop-Helix
    DNA binding motif with two alpha helices connected by a loop, facilitating DNA binding and dimerization.
  • Sigma Subunit
    Variable component of prokaryotic RNA polymerase that determines promoter recognition and gene specificity.
  • Operon
    Cluster of functionally related genes in prokaryotes transcribed together under control of a single promoter.