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Related Concept Videos

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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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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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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Riboswitches01:56

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity
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Transfer RNA modifications and cellular thermotolerance.

Takayuki Ohira1, Tsutomu Suzuki1

  • 1Department of Chemistry and Biotechnology, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Molecular Cell
|January 5, 2024
PubMed
Summary
This summary is machine-generated.

Transfer RNA (tRNA) modifications are crucial for gene expression and cellular function. Thermophiles utilize unique tRNA modifications to adapt and survive at high temperatures.

Keywords:
RNA modificationcellular thermotolerancetRNAthermophile

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA molecules undergo post-transcriptional modifications to achieve diverse functions.
  • Transfer RNA (tRNA) exhibits a wide variety and large number of modifications, essential for genetic code decoding and structural stability.
  • Alterations in tRNA modifications impact tRNA structure, function, and gene expression regulation.

Purpose of the Study:

  • To review the history and recent findings on tRNA modifications in thermophilic organisms.
  • To explore the functions and biogenesis of specific tRNA modifications contributing to thermotolerance.
  • To understand how dynamic regulation of tRNA modifications enhances fitness in extreme environments.

Main Methods:

  • Literature review of historical and current research on tRNA modifications.
  • Analysis of studies focusing on thermophilic organisms and their unique tRNA modification patterns.
  • Examination of research on the biogenesis pathways of temperature-responsive tRNA modifications.

Main Results:

  • Thermophiles possess characteristic tRNA modifications that are dynamically regulated with temperature changes.
  • These modifications are vital for maintaining tRNA structure and function under high-temperature stress.
  • Specific tRNA modifications contribute significantly to the cellular thermotolerance of thermophiles.

Conclusions:

  • T tRNA modifications play a critical role in the adaptation of thermophiles to extreme temperatures.
  • Understanding these modifications provides insights into cellular survival mechanisms in harsh environments.
  • Further research into tRNA modification biogenesis can reveal novel strategies for enhancing cellular robustness.