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tRNA Activation02:26

tRNA Activation

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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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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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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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ATP Synthase: Structure01:18

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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Valine tRNA levels and availability regulate complex I assembly in leukaemia.

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Deregulation of transfer RNA (tRNA) biogenesis fuels cancer. Restricting dietary valine impairs leukemia cell growth by targeting mitochondrial energy production, offering a novel therapeutic strategy for T-ALL.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Metabolic Pathways

Background:

  • Deregulation of transfer RNA (tRNA) biogenesis is implicated in cancer progression.
  • The specific mechanisms and consequences of tRNA deregulation in tumorigenesis remain unclear.
  • T cell acute lymphoblastic leukemia (T-ALL) relies on specific oncogenic pathways for growth.

Purpose of the Study:

  • To investigate the role of tRNA biogenesis in T-ALL pathogenesis.
  • To identify mechanisms by which tRNA deregulation contributes to leukemia.
  • To explore therapeutic strategies targeting tRNA metabolism in T-ALL.

Main Methods:

  • CRISPR-Cas9 screening to identify genes involved in tRNA biogenesis.
  • Analysis of valine tRNA synthetase expression and its regulation by NOTCH1.
  • In vivo studies involving dietary valine restriction in mouse models.
  • Assessment of mitochondrial complex I assembly and oxidative phosphorylation.
  • Genome-wide CRISPR-Cas9 loss-of-function screens under varying valine conditions.

Main Results:

  • Altered valine tRNA biogenesis enhances mitochondrial bioenergetics in T-ALL.
  • NOTCH1 upregulates valine aminoacyl tRNA synthetase, linking oncogenic programs to tRNA supply.
  • Dietary valine restriction reduces leukemia burden and improves survival in mice.
  • Valine restriction impairs mitochondrial complex I assembly and oxidative phosphorylation.
  • Genetic or pharmacological targeting of SLC7A5 and BCL2 synergizes with valine restriction to inhibit T-ALL growth.

Conclusions:

  • tRNA deregulation is a critical adaptation in T-ALL pathogenesis.
  • Targeting tRNA biogenesis, specifically valine metabolism, offers a potential therapeutic avenue.
  • Dietary interventions represent a promising strategy for treating blood malignancies.