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Related Concept Videos

Translational Regulation01:29

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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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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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
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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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How do bacteria tune translation efficiency?

Gene-Wei Li1

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, United States.

Current Opinion in Microbiology
|January 31, 2015
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Summary
This summary is machine-generated.

Understanding bacterial translation efficiency (TE) is key for recombinant protein production. New high-throughput methods reveal mRNA secondary structure near the start codon has a mild but significant impact on TE.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Synthetic Biology

Background:

  • Bacterial protein translation rates are precisely regulated for cellular needs.
  • Recombinant protein expression in bacteria often shows unpredictable translation levels.
  • The strategy bacteria use to tune translation efficiency (TE) is not fully understood.

Purpose of the Study:

  • To explore the factors influencing bacterial translation efficiency (TE).
  • To understand the disconnect between natural and synthetic mRNA translation.
  • To provide a theoretical framework for measuring TE.

Main Methods:

  • Utilizing array-based oligonucleotide synthesis.
  • Employing ribosome profiling techniques.
  • Analyzing high-throughput study data.

Main Results:

  • Identified a statistically significant, albeit mild, contribution of mRNA secondary structure around the start codon to TE.
  • Highlighted the limitations in current understanding of TE determinants.
  • Demonstrated the utility of new high-throughput approaches.

Conclusions:

  • mRNA secondary structure near the start codon plays a role in bacterial TE.
  • Further research is needed to fully elucidate the determinants of TE.
  • Developed a theoretical framework to aid in measuring TE for improved recombinant protein expression.