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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Coordination of Gene Expression Processes in Bacteria01:29

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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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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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RNA polymerase efficiently transcribes through DNA-scaffolded, cooperative bacteriophage repressor complexes.

Yue Lu1, Zsuzsanna Voros1, Gustavo Borjas1

  • 1Physics Department, Emory University, Atlanta, GA, USA.

FEBS Letters
|July 12, 2022
PubMed
Summary

DNA-binding repressors, like phage 186 CI and lambda CI, do not effectively block transcription by Escherichia coli RNA polymerase (RNAP), even when forming DNA loops or scaffolds.

Keywords:
atomic force microscopybacteriophage repressorsroadblock efficiencytopologytranscription

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Area of Science:

  • Molecular biology
  • Biophysics
  • Genetics

Background:

  • DNA-binding proteins play crucial roles in gene regulation.
  • Protein-DNA interactions can form complex structures like loops and scaffolds.
  • Understanding how these structures affect DNA transcription is vital.

Purpose of the Study:

  • To investigate the impact of DNA-scaffolded and DNA-looped repressor complexes on transcription elongation by RNA polymerase.
  • To determine if high-affinity repressor binding translates to effective transcriptional roadblocks.

Main Methods:

  • Utilized atomic force microscopy to visualize and measure transcription elongation.
  • Studied complexes formed by phage 186 CI repressor and phage lambda CI repressor with DNA.
  • Assessed the interference of RNAP transcription through both unlooped and looped/wrapped protein-DNA structures.

Main Results:

  • Phage 186 CI and lambda CI repressors bound to unlooped DNA showed minimal interference with RNA polymerase (RNAP) transcription.
  • Wrapped and looped DNA topologies induced by these repressors did not significantly impede RNAP transcription.
  • High-affinity binding of these repressors did not result in effective roadblocks to transcription.

Conclusions:

  • Cooperative binding of protein oligomers to DNA, forming scaffolds or loops, does not necessarily create significant roadblocks for transcription.
  • Escherichia coli RNA polymerase can efficiently transcribe DNA even in the presence of high-affinity, structurally organized repressor complexes.
  • The effectiveness of transcriptional repression is context-dependent and not solely determined by binding affinity or DNA topology.