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Related Concept Videos

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.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Translation01:31

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Transcription01:17

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Transcription is the synthesis of RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
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Transcription Elongation Factors02:35

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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
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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...
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Xenopus laevis as a Model to Identify Translation Impairment
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Translation selectively destroys non-functional transcription complexes.

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Summary

Translation actively removes stalled transcription complexes from damaged DNA. Ribosomes distinguish between stalled and paused complexes, ensuring only stalled ones are cleared, preventing genome conflicts.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transcription elongation can stall at DNA lesions, requiring removal of the transcription elongation complex (EC) for DNA repair.
  • Coupling of transcription and translation in bacteria is a known phenomenon.

Purpose of the Study:

  • To investigate the role of translation in dislodging stalled transcription elongation complexes (ECs) from damaged DNA templates.
  • To determine if ribosomes can differentiate between stalled and paused ECs.
  • To elucidate the mechanisms by which stalled ECs are cleared from the genome.

Main Methods:

  • In vitro transcription assays
  • Ribosome pausing and dislodging experiments
  • Analysis of RNA polymerase Trigger Loop function
  • Investigating the roles of UvrD and Mfd in transcription-coupled DNA repair

Main Results:

  • Translation actively dislodges stalled ECs from damaged DNA, while paused ECs are supported by ribosomes.
  • Ribosomes exhibit kinetic and functional discrimination between stalled and paused ECs, mediated by the RNA polymerase Trigger Loop.
  • Transcription-coupled DNA repair factors Mfd and UvrD interact with translation to clear stalled ECs, and ribosomes eliminate misincorporated ECs.

Conclusions:

  • Coupling to translation is a primary mechanism for clearing non-functional transcription elongation complexes (ECs) from the genome.
  • This process ensures selective removal of stalled ECs, preventing potential conflicts with DNA replication.
  • The ribosome's ability to discriminate and dislodge stalled ECs highlights a crucial aspect of genome maintenance in bacteria.