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Dbp5, Gle1-IP6 and Nup159: a working model for mRNP export

Andrew W Folkmann1, Kristen N Noble, Charles N Cole

  • 1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA.

Nucleus (Austin, Tex.)
|November 9, 2011
PubMed

Insights

Messenger ribonucleoprotein particles (mRNPs) undergo dynamic remodeling during gene expression. This study updates the model for the DEAD-box protein Dbp5 cycle during messenger RNA export through the nuclear pore complex.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Messenger ribonucleoprotein particles (mRNPs) are dynamic complexes essential for gene expression.
  • The composition of RNA-binding proteins in mRNPs changes throughout transcription, processing, export, and translation.
  • Nuclear pore complex (NPC) export involves the DEAD-box protein Dbp5, activated by Gle1-IP6.

Purpose of the Study:

  • To provide an updated model of the Dbp5 cycle during mRNP export through the NPC.
  • To integrate recent findings on Dbp5 function, regulation, and mechanism.
  • To establish a framework for future research on mRNP export.

Main Methods:

  • In vitro biochemical assays
  • X-ray crystallography
  • In vivo phenotypic analysis

Main Results:

  • Detailed mechanistic insights into Dbp5 RNP remodeling.
  • Elucidation of Gle1-IP6's role in stimulating Dbp5 ATPase activity.
  • Identification of Nup159 as a novel regulator of Dbp5.

Conclusions:

  • An updated model for the Dbp5 cycle during mRNP export is proposed.
  • This model incorporates recent data on Dbp5 regulation and function.
  • The proposed model serves as a foundation for future investigations into mRNP biogenesis and export.

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