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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

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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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Transfer RNA Synthesis02:36

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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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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Translation01:31

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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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From DNA to Protein03:06

From DNA to Protein

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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Leaky Scanning02:28

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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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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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Anticodon stem-loop tRNA modifications influence codon decoding and frame maintenance during translation.

Tyler J Smith1, Rachel N Giles1, Kristin S Koutmou1

  • 1University of Michigan, Department of Chemistry, 930 N University, Ann Arbor, MI 48109, USA.

Seminars in Cell & Developmental Biology
|June 29, 2023
PubMed
Summary
This summary is machine-generated.

Transfer RNAs (tRNAs) feature numerous chemical modifications, especially in the anticodon stem-loop (ASL). These modifications are vital for accurate protein synthesis by influencing mRNA codon recognition and reading frame maintenance.

Keywords:
DecodingFrameshiftingRNA modificationTranslationtRNA

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNAs are essential for protein synthesis, with transfer RNAs (tRNAs) being highly modified molecules.
  • tRNAs contain over 90 distinct chemical modifications that stabilize structure and enhance function.
  • Anticodon stem-loop (ASL) modifications are particularly important for accurate translation and protein homeostasis.

Purpose of the Study:

  • To review the molecular consequences of tRNA ASL modifications.
  • To examine the role of these modifications in mRNA codon recognition and reading frame maintenance.

Main Methods:

  • Literature review of existing biochemical and biophysical studies.
  • Analysis of the impact of specific ASL modifications on translation steps.

Main Results:

  • tRNA ASL modifications differentially influence discrete steps in the translation pathway.
  • These modifications are crucial for ensuring rapid and accurate protein translation.

Conclusions:

  • tRNA ASL modifications are critical for maintaining cellular health and ensuring accurate protein synthesis.
  • Understanding these modifications provides insight into fundamental biological processes.