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Pre-mRNA splicing and mRNA export linked by direct interactions between UAP56 and Aly

M L Luo1, Z Zhou, K Magni

  • 1Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Nature
|October 26, 2001
PubMed

Insights

The splicing factor UAP56 recruits the mRNA export factor Aly to the spliced mRNA-protein complex. This interaction is crucial for coupling mRNA splicing and export in vivo.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Messenger RNA (mRNA) splicing and export are coupled processes in vivo.
  • The mRNA export factor Aly is recruited to spliced mRNA-protein complexes (mRNPs) for export.
  • The mechanism of Aly recruitment to mRNPs remains unclear.

Purpose of the Study:

  • To investigate the mechanism of Aly recruitment to the spliced mRNP.
  • To identify factors involved in coupling mRNA splicing and export.

Main Methods:

  • Protein interaction studies to assess UAP56 and Aly binding.
  • Analysis of UAP56 and Aly localization within mRNPs.
  • Functional assays using dominant-negative inhibition and site-directed mutagenesis.

Main Results:

  • The DEAD-box helicase UAP56 specifically interacts with Aly.
  • UAP56 and Aly are co-localized in the spliced mRNP.
  • Excess UAP56 inhibits mRNA export and Aly recruitment.
  • A mutation in Aly disrupting UAP56 interaction prevents Aly recruitment.

Conclusions:

  • UAP56 plays a critical role in recruiting Aly to the spliced mRNP.
  • UAP56 acts as a bridge between splicing and export machineries.
  • This recruitment is essential for efficient mRNA export.

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