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Nuclear export factor RBM15 facilitates the access of DBP5 to mRNA

Andrei S Zolotukhin1, Hiroaki Uranishi, Susan Lindtner

  • 1Human Retrovirus Pathogenesis Section, National Cancer Institute-Frederick, Frederick, MD 21702-1201, USA.

Nucleic Acids Research
|September 30, 2009
PubMed

Insights

The protein RBM15 helps the RNA helicase DBP5 interact with messenger RNA (mRNA) export complexes. This interaction is crucial for moving mRNA from the nucleus to the cytoplasm, ensuring proper gene expression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Messenger RNA (mRNA) export is a fundamental process for gene expression, mediated by the NXF1 receptor.
  • The DEAD-box RNA helicase Dbp5 is known to be essential for mRNA export, likely by dissociating export factors from mRNA.
  • The precise mechanism by which Dbp5 recognizes mRNA-export complexes remains unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism by which Dbp5 recognizes mRNA-export complexes.
  • To investigate the role of RBM15 in the interaction between Dbp5 and mRNA export machinery.

Main Methods:

  • In vivo binding assays to detect interactions between RBM15, DBP5, and NXF1.
  • Immunofluorescence microscopy to determine the subcellular localization of RBM15, DBP5, and NXF1.
  • Gene silencing (siRNA) to assess the functional requirement of RBM15 in mRNA export.
  • Analysis of mRNA levels in the cytoplasm and nucleus following RBM15 depletion.

Main Results:

  • RBM15 specifically binds to human DBP5 and facilitates its direct contact with mRNA in vivo.
  • RBM15 localizes to the nuclear envelope and extensively colocalizes with DBP5 and NXF1.
  • Silencing of RBM15 results in reduced mRNA levels in the cytoplasm and accumulation in the nucleus.
  • RBM15 is essential for the efficient export of both general and specific endogenous mRNA transcripts.

Conclusions:

  • RBM15 acts as a crucial adaptor protein at the nuclear pore complex.
  • RBM15 facilitates the recognition of NXF1-mRNP complexes by DBP5 during mRNA translocation.
  • RBM15 plays a vital role in ensuring directional and efficient mRNA export from the nucleus to the cytoplasm.

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