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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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Glucose Starvation Blocks Translation at Multiple Levels.

Chen-Song Zhang1, D Grahame Hardie2, Sheng-Cai Lin1

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This summary is machine-generated.

Glucose deficiency halts protein translation and promotes cell survival. Glucose is vital for leucyl-tRNA synthetase (LARS1) activity and mTORC1 function, which are inhibited by glucose starvation via the AMPK-ULK1 pathway.

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Area of Science:

  • Cellular metabolism
  • Molecular biology
  • Biochemistry

Background:

  • Glucose is essential for cellular energy and biosynthesis.
  • Protein translation is a key cellular process regulated by nutrient availability.
  • Previous studies suggest nutrient deprivation impacts translation.

Purpose of the Study:

  • To investigate the role of glucose in regulating protein translation.
  • To elucidate the molecular mechanisms by which glucose starvation inhibits translation.
  • To examine the involvement of leucyl-tRNA synthetase (LARS1) and mTORC1 signaling.

Main Methods:

  • Cellular assays to measure translation rates.
  • Biochemical analysis of LARS1 activity and phosphorylation.
  • Western blotting to assess mTORC1 pathway activation.
  • Investigating the AMPK-ULK1 signaling pathway.

Main Results:

  • Glucose is required for full leucyl-tRNA synthetase (LARS1) activity.
  • Glucose maintains mTORC1 function through LARS1 to enhance translation.
  • Glucose starvation inhibits these effects by promoting LARS1 phosphorylation via the AMPK-ULK1 pathway.
  • Translation is inhibited at multiple levels during glucose starvation.

Conclusions:

  • Glucose is a critical regulator of protein translation.
  • The LARS1-mTORC1 axis is a key target of glucose starvation.
  • The AMPK-ULK1 pathway mediates the inhibitory effects of glucose deficiency on translation.