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Related Concept Videos

Initiation of Translation02:33

Initiation of Translation

39.8K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Initiation of Translation02:33

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Translation in Prokaryotes01:29

Translation in Prokaryotes

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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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Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

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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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Improving Translational Accuracy02:07

Improving Translational Accuracy

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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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Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Related Experiment Video

Updated: Mar 6, 2026

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
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Engineering bacterial translation initiation - Do we have all the tools we need?

Justin R J Vigar1, Hans-Joachim Wieden1

  • 1Alberta RNA Research and Training Institute, Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive West, Lethbridge, Alberta T1K 3M4, Canada.

Biochimica Et Biophysica Acta. General Subjects
|March 19, 2017
PubMed
Summary

Precise control over gene expression is vital for bioengineering. This review details strategies for predictable control of translation initiation in bacteria, highlighting areas for improvement in synthetic biology tools.

Keywords:
RNA engineeringRational designRiboregulationRibosome engineeringSynthetic biologyTranslation initiation

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Precise control over gene expression is critical for bioengineering applications.
  • Translation initiation is a key regulatory step in protein biosynthesis, making it a target for gene expression control.
  • Modulating mRNA-ribosome interactions offers a way to fine-tune protein production.

Purpose of the Study:

  • To outline state-of-the-art strategies for predictable control of translation initiation in bacteria.
  • To discuss current limitations and future goals in the field of synthetic gene regulation.

Main Methods:

  • Review of existing engineering tools for rational design of synthetic mRNA initiation characteristics.
  • Analysis of strategies for modulating mRNA structure (e.g., using small molecules, RNAs, RNA-binding proteins).

Main Results:

  • Translation initiation is the rate-determining step, ideal for effective regulation.
  • Engineering tools exist to design synthetic mRNA initiation, but require improvement.
  • Enhancements are needed in predictability, effectiveness, and portability of these tools.

Conclusions:

  • Predictable control over translation initiation is essential for designing reliable genetic circuits.
  • Advancements in this area will propel synthetic biology and fundamental understanding of biological processes.