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Transcription in Prokaryotes01:28

Transcription in Prokaryotes

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Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow...
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Bacterial Transcription01:53

Bacterial Transcription

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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.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Prokaryotic Transcriptional Activators and Repressors01:58

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
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Prokaryotic Transcriptional Activators and Repressors01:58

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Overview of Archaea01:29

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Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
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Application of Biolayer Interferometry BLI for Studying Protein-Protein Interactions in Transcription
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Archaeal transcription.

Breanna R Wenck1, Thomas J Santangelo1

  • 1Department of Biochemistry and Molecular Biology, Colorado State University , Fort Collins, CO, USA.

Transcription
|October 28, 2020
PubMed
Summary
This summary is machine-generated.

Archaea utilize unique gene expression regulation, blending bacterial and eukaryotic strategies. Recent studies reveal a complete archaeal transcription cycle with complex post-initiation controls.

Keywords:
ArchaeaEtaFttARNA polymeraseSpt4/5TFSarchaeal histonestranscription

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Gene expression regulation in Archaea is complex, involving a mix of universal, archaeal-specific, and shared mechanisms with bacteria and eukaryotes.
  • Archaea possess transcription components homologous to eukaryotes and employ a simplified eukaryotic-like initiation, alongside bacterial-like promoter and elongation controls.

Purpose of the Study:

  • To review the complete archaeal transcription cycle.
  • To highlight recent findings in archaeal transcription research.
  • To detail the post-initiation regulation of archaeal transcription.

Main Methods:

  • Review of existing literature and recent findings in archaeal transcription.
  • Analysis of biochemical and genetic techniques used to study gene expression.
  • Synthesis of information on archaeal transcription initiation, elongation, and termination.

Main Results:

  • A comprehensive understanding of the complete archaeal transcription cycle has been established.
  • Emerging archaeal-specific regulatory strategies complement shared bacterial and eukaryotic mechanisms.
  • Significant advancements in understanding post-initiation regulation of archaeal transcription have been made.

Conclusions:

  • Archaea exhibit a unique and intricate system of gene expression regulation.
  • The interplay of archaeal-specific, bacterial-like, and eukaryotic-like mechanisms creates a complex regulatory landscape.
  • Ongoing research continues to expand our knowledge of archaeal transcription control.