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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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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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Structural and Functional Insights into Viral Programmed Ribosomal Frameshifting.

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Summary
This summary is machine-generated.

Programmed -1 ribosomal frameshifting (-1PRF) allows RNA viruses to regulate protein production. Recent structural and molecular studies reveal surprising complexity in this essential viral strategy.

Keywords:
HIVSARS-CoV-2frameshiftpseudoknotribosometranslation

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Area of Science:

  • Molecular Biology
  • Virology
  • Structural Biology

Background:

  • Ribosomes accurately translate messenger RNA (mRNA) during protein synthesis, with spontaneous errors being rare.
  • Programmed -1 ribosomal frameshifting (-1PRF) is a high-frequency, programmed ribosomal slip backward by one nucleotide on mRNA.
  • RNA viruses utilize -1PRF to control viral protein stoichiometry during genome translation.

Purpose of the Study:

  • To summarize recent advances in understanding programmed -1 ribosomal frameshifting.
  • To explore the structural diversity and mechanistic complexity of -1PRF.
  • To evaluate the utility of a general model for -1PRF.

Main Methods:

  • X-ray crystallography and cryo-electron microscopy (cryo-EM) for structural analysis.
  • Deep sequencing and single-molecule approaches for mechanistic insights.
  • Characterization of molecular players in isolation and within the elongating ribosome.

Main Results:

  • Revealed unexpected structural diversity in -1PRF mechanisms.
  • Demonstrated significant mechanistic complexity across different model systems.
  • Detailed characterization of key molecular players involved in -1PRF.

Conclusions:

  • Programmed -1 ribosomal frameshifting is a complex and diverse regulatory mechanism exploited by RNA viruses.
  • Recent structural and molecular studies have significantly advanced our understanding of -1PRF.
  • The concept of a general model for -1PRF is being re-evaluated in light of new findings.