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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

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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Mutations01:35

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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The Lambda Select cII Mutation Detection System
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Published on: April 26, 2018

Anticodon loop mutations perturb reading frame maintenance by the E site tRNA.

Christina L Sanders1, Kristin J Lohr, Holly L Gambill

  • 1Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27106, USA.

RNA (New York, N.Y.)
|August 2, 2008
PubMed
Summary
This summary is machine-generated.

Mutations in transfer RNA (tRNA) anticodon loops and stems can disrupt the ribosomal reading frame. Unexpectedly, some mutations and the absence of certain nucleoside modifications did not impair tRNA’s frame-holding ability in the E site.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The ribosomal E site plays a crucial role in maintaining the translation reading frame.
  • Mutations in transfer RNA (tRNA), particularly in the anticodon loop, can significantly impact translation fidelity.
  • The amber suppressor tRNA, Su7, is a key molecule for studying these effects.

Purpose of the Study:

  • To investigate the impact of mutations in the anticodon loop and stem of the Su7 tRNA on its ability to maintain the ribosomal reading frame in the E site.
  • To assess the role of the "Hirsh" mutation in the D stem on frame maintenance.
  • To determine the effect of the absence of ms(2)io(6)A nucleoside modifications at A37 on tRNA's frame-holding capacity in the E site.

Main Methods:

  • Utilizing the Escherichia coli RF2 programmed frameshift site to quantify reading frame maintenance.
  • Introducing saturation mutations in the anticodon loop of the Su7 tRNA.
  • Introducing mutations in the anticodon stem and the D stem (Hirsh mutation) of the Su7 tRNA.
  • Analyzing the effect of removing ms(2)io(6)A nucleoside modifications at A37.

Main Results:

  • Most anticodon loop mutations increased frameshifting, suggesting decreased codon:anticodon stability, but the A site appears more sensitive to these structural changes.
  • The Hirsh mutation unexpectedly increased frameshifting from the E site, potentially by enhancing tRNA's ability to interact with the A site.
  • The absence of ms(2)io(6)A nucleoside modifications at A37 did not impair the tRNA's frame-holding ability in the E site, contrary to expectations based on its effects in other ribosomal sites.

Conclusions:

  • The ribosomal E site exhibits distinct substrate requirements compared to the A and P sites.
  • Anticodon loop structure is critical for tRNA function, but its impact on the E site's frame-holding capacity differs from its impact on other ribosomal sites.
  • The Hirsh mutation's effect suggests a complex interplay between tRNA structure, ribosomal site interactions, and translational fidelity.