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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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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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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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RNA Structure01:19

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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.
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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Functional redundancy in tRNA dihydrouridylation.

Claudia Sudol1,2, Lea-Marie Kilz3, Virginie Marchand4,5

  • 1Sorbonne Université, CNRS, Institut de Biologie Paris Seine, Biology of Aging and Adaptation, Paris 75252, France.

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Bacillus subtilis uses two enzymes, DusB1 and DusB2, for dihydrouridine (D) modification in transfer RNA (tRNA), revealing functional redundancy crucial for bacterial growth at low temperatures.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Microbiology

Background:

  • Dihydrouridine (D) is a prevalent modified base in transfer RNA (tRNA).
  • Mechanisms of D biosynthesis, especially in prokaryotes, are not well understood.

Purpose of the Study:

  • Investigate D biosynthesis pathways in Bacillus subtilis.
  • Elucidate the roles of DusB1 and DusB2 enzymes in tRNA modification.
  • Determine the functional significance of D modification for bacterial growth.

Main Methods:

  • Genetic analysis
  • Biochemical assays
  • Epitranscriptomic approaches
  • tRNA-wide D-mapping

Main Results:

  • Identified two FMN-dependent flavoproteins, DusB1 and DusB2, responsible for D formation in B. subtilis tRNA.
  • DusB1 modifies multiple sites (17, 20, 20a, 47), while DusB2 targets positions 20 and 20a, indicating functional redundancy.
  • DusB2 shows higher efficiency and can compensate for DusB1 activity under certain conditions.
  • D modification is essential for B. subtilis growth at suboptimal temperatures.

Conclusions:

  • B. subtilis employs a redundant enzymatic system (DusB1 and DusB2) for widespread dihydrouridylation of tRNA.
  • Functional redundancy in tRNA modification contributes to bacterial adaptation and survival.
  • This study enhances understanding of D modification in prokaryotes and its physiological relevance.