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Related Concept Videos

tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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...
RNA Structure01:19

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...

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Related Experiment Video

Updated: Jul 12, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses
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Published on: February 25, 2011

Mechanism of Ribosomal A1493 in Stabilizing and Rigidly Supporting the Codon-Anticodon Helix During tRNA Recognition.

Shuhao Zhang1,2, Zhen Wang3, Jie Qiao4

  • 1School of Arts and Sciences, Qingdao Binhai University, Qingdao 266555, China.

The Journal of Physical Chemistry. B
|July 10, 2026
PubMed
Summary

Ribosomes ensure accuracy in protein synthesis by monitoring codon-anticodon interactions. This study reveals how conserved nucleotide A1493 stabilizes these interactions, acting as a wedge and highlighting the ribosome

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Last Updated: Jul 12, 2026

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • The ribosome is crucial for translational accuracy, monitoring codon-anticodon interactions at the A site.
  • The precise mechanism of conserved nucleotides in this decoding process is still debated.

Purpose of the Study:

  • To investigate the role of conserved ribosomal nucleotide A1493 in codon-anticodon stability and tRNA recognition.
  • To elucidate the coupling between codon-anticodon base pair stability and A1493 dynamics.

Main Methods:

  • Molecular dynamics simulations using a tRNA recognition intermediate.
  • Systematic investigation of cognate and near-cognate tRNA systems.

Main Results:

  • A1493 stabilizes the codon-anticodon helix via an entropic mechanism, acting as a wedge.
  • Van der Waals interactions between A1493 and tRNA residue 37 are critical for A1493 flipping.
  • A1913 conformational changes suggest the large ribosomal subunit participates in tRNA recognition specificity.

Conclusions:

  • Refined understanding of how conserved ribosomal nucleotides contribute to decoding accuracy.
  • Identified A1493 as a key component stabilizing codon-anticodon interactions.
  • Highlighted the interplay between ribosomal nucleotides and tRNA structure in translational fidelity.