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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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MS2-Affinity Purification Coupled with RNA Sequencing in Gram-Positive Bacteria
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Msn2 coordinates a stoichiometric gene expression program.

Jacob Stewart-Ornstein1, Christopher Nelson, Joe DeRisi

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94143,USA; Howard Hughes Medical Institute, St. Louis, MO 63110, USA; The California Institute for Quantitative Biosciences, Berkeley, CA 94720, USA.

Current Biology : CB
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

Cells precisely control gene expression using transcription factor Msn2. Low-affinity binding and competition allow graded responses to environmental stimuli, ensuring coordinated gene activation.

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Area of Science:

  • Molecular Biology
  • Systems Biology
  • Genetics

Background:

  • Cellular processes often exhibit analog responses, where output magnitude matches stimulus intensity.
  • Maintaining coherent gene expression requires proportional regulation of multiple genes across varying induction levels.
  • Current understanding of graded gene regulation strategies is incomplete.

Purpose of the Study:

  • To investigate the relationship between stress-responsive gene expression and the transcription factor Msn2.
  • To elucidate the mechanisms underlying graded gene regulation by Msn2.
  • To identify general strategies for achieving precise and proportional gene expression.

Main Methods:

  • Computational modeling
  • In vivo analyses
  • In vitro experiments

Main Results:

  • A graded relationship was observed between stress-responsive gene expression and Msn2 concentration.
  • The strategy involves noncooperative, low-affinity interactions between Msn2 and its binding sites.
  • Competition for a large number of Msn2 binding sites relative to Msn2 molecules drives the graded response.

Conclusions:

  • This strategy allows precise gene expression tuning to environmental conditions.
  • It ensures collinear activation of target genes for stoichiometric expression without extensive promoter modification.
  • The system allows for promoter activity modulation and enhances regulon evolvability.