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Related Concept Videos

Initiation of Translation02:33

Initiation of Translation

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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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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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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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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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Related Experiment Video

Updated: Aug 12, 2025

An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics

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Single-molecule visualization of mRNA circularization during translation.

Byungju Kim1, Jincheol Seol2, Yoon Ki Kim3

  • 1Department of Physics, Pohang University of Science & Technology (POSTECH), Pohang, 37673, Republic of Korea.

Experimental & Molecular Medicine
|January 31, 2023
PubMed
Summary

Single-molecule imaging challenges the traditional mRNA circularization theory in translation. This research explores new insights into translation regulation and ribosome recycling.

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Related Experiment Videos

Last Updated: Aug 12, 2025

An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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Probing mRNA Kinetics in Space and Time in Escherichia coli using Two-Color Single-Molecule Fluorescence In Situ Hybridization
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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Translation is a fundamental biological process regulated by intricate molecular interactions.
  • The prevailing theory suggests mRNA circularization, via eukaryotic initiation factor 4E (eIF4E)-eukaryotic initiation factor 4G (eIF4G)-poly(A)-binding protein (PABP) interactions, enhances translation and ribosome recycling.

Purpose of the Study:

  • To investigate the mechanisms of mRNA circularization and its role in translation.
  • To present findings from single-molecule fluorescence imaging that challenge established models.
  • To explore new insights into translation regulation.

Main Methods:

  • Single-molecule fluorescence imaging techniques were employed for in vitro and live-cell studies.
  • Analysis of complex data to visualize dynamic molecular interactions during translation.

Main Results:

  • Observed complex data that contradicts the traditional functional circularization theory of mRNA.
  • Visualized dynamic aspects of translation initiation and mRNA-ribosome interactions.

Conclusions:

  • Single-molecule imaging provides novel perspectives on mRNA circularization and translation.
  • Further research is needed to fully understand the implications of these findings for translation regulation and ribosome dynamics.