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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs
10:37

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

Control of mRNA export and translation termination by inositol hexakisphosphate requires specific interaction with

Abel R Alcázar-Román1, Timothy A Bolger, Susan R Wente

  • 1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-8240, USA.

The Journal of Biological Chemistry
|April 8, 2010
PubMed

Insights

Inositol hexakisphosphate (IP(6)) specifically binds Gle1, a key factor in mRNA export and translation termination. This interaction is crucial for activating Dbp5 ATPase activity, ensuring proper cellular processes.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Messenger RNA (mRNA) export through the nuclear pore complex (NPC) requires soluble factors like Gle1 and inositol hexakisphosphate (IP(6)).
  • Gle1 and IP(6) activate the DEAD-box protein Dbp5, essential for mRNA export directionality and translation termination.
  • The precise in vivo interaction specificity between IP(6) and Gle1 remains unclear.

Purpose of the Study:

  • To biochemically characterize the interaction between Gle1 and IP(6).
  • To determine the relationship between IP(6)-Gle1 interaction, Dbp5 binding, and Dbp5 stimulation.
  • To investigate the in vivo role of the IP(6)-Gle1 interaction in mRNA export and translation termination.

Main Methods:

  • Biochemical assays to characterize Gle1-IP(6) binding.
  • In vitro experiments to assess Dbp5 stimulation by Gle1-IP(6) complex.
  • Analysis of Saccharomyces cerevisiae mutants with altered IP(6)-binding sites in Gle1.

Main Results:

  • Specific Gle1 residues essential for IP(6) binding were identified.
  • These residues are necessary for IP(6)-dependent stimulation of Dbp5 ATPase activity in vitro.
  • Gle1 was confirmed as the primary in vivo target of IP(6) for both mRNA export and translation termination.
  • IP(6)-binding mutants of Gle1 phenocopied IP(6) depletion effects on mRNA export and translation termination.

Conclusions:

  • Gle1 specifically binds IP(6) through identified residues.
  • This specific interaction is required for potentiation of Dbp5 ATPase activity.
  • The Gle1-IP(6) interaction is critical for both mRNA export and translation termination processes.

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