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Related Concept Videos

Types of RNA01:20

Types of RNA

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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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.
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Initiation of Translation02:33

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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.
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Ribosome Profiling02:24

Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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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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Translation01:31

Translation

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Lesson: Translation
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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Decoding and Recoding of mRNA Sequences by the Ribosome.

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  • 1Department of Physical Biochemistry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany;

Annual Review of Biophysics
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Summary

Messenger RNA (mRNA) translation fidelity is crucial for cell function. Recoding events, like frameshifting, intentionally alter protein synthesis by changing ribosome dynamics based on mRNA signals and cellular genetics.

Keywords:
EF-GEF-Tuframeshiftingkineticsribosomestop codon readthroughtRNAtranslation

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Accurate protein synthesis from messenger RNA (mRNA) is vital for cellular homeostasis.
  • Ribosomes typically maintain a strict reading frame, and errors like incorrect aminoacyl-tRNA selection are rare.
  • Recoding events represent programmed deviations from canonical translation.

Purpose of the Study:

  • To review the mechanisms of canonical mRNA decoding and ribosome translocation.
  • To describe alternative pathways of translational recoding.
  • To explore the interplay between mRNA signals, ribosome dynamics, and recoding outcomes.

Main Methods:

  • Literature review of canonical decoding and recoding mechanisms.
  • Analysis of ribosome dynamics during translation.
  • Examination of mRNA sequence elements and cellular factors influencing recoding.

Main Results:

  • Canonical translation relies on precise tRNA selection and reading frame maintenance.
  • Recoding events (stop codon readthrough, frameshifting, bypassing) reprogram the ribosome.
  • Recoding is triggered by mRNA signals and modulated by cellular genetic context, leading to cell-specific expression.

Conclusions:

  • Recoding allows for the production of alternative proteins from a single mRNA.
  • Ribosome dynamics are central to the recoding process.
  • Understanding recoding provides insights into complex gene expression regulation.