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tRNA Activation02:26

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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...
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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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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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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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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Errors in translational decoding: tRNA wobbling or misincorporation?

Xumin Ou1,2, Jingyu Cao1, Anchun Cheng1,3,4

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Errors in transfer RNA (tRNA) decoding during messenger RNA (mRNA) translation can cause mistranslation, leading to diseases. Recent advances clarify these mechanisms and their roles in viral evolution and cancer.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Genetic information flows from DNA to RNA to protein via translation.
  • Messenger RNA (mRNA) translation errors, or mistranslation, can occur.
  • While usually tolerated, high levels of mistranslation cause diseases.

Purpose of the Study:

  • To review recent progress on the mechanistic basis of erroneous mRNA decoding.
  • To discuss the consequences of mistranslation in physiology and pathology.
  • To emphasize the role of mistranslation in viral evolution and cancer development.

Main Methods:

  • Review of recent mechanistic studies on translational decoding.
  • Analysis of the impact of tRNA misdecoding and misacylation.
  • Focus on literature concerning viral evolution and cancer.

Main Results:

  • Mistranslation primarily stems from errors in tRNA decoding and misacylation.
  • The absence of specific codon-paired tRNA species exacerbates mistranslation.
  • Substantial progress has been made in understanding mistranslation mechanisms and consequences.

Conclusions:

  • Understanding mistranslation mechanisms is crucial for comprehending diseases.
  • Mistranslation plays a significant role in viral evolution.
  • Aberrant translation contributes to cancer development.