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Sem1: a versatile "molecular glue"?

Marius Boulos Faza1, Stefan Kemmler, Vikram Govind Panse

  • 1Institute of Biochemistry (IBC), ETH Zürich, Zürich, Switzerland.

Nucleus (Austin, Tex.)
|February 18, 2011
PubMed
Summary
This summary is machine-generated.

Sem1 protein, beyond its proteasome role, is crucial for mRNA export and DNA organization. It functions within the TREX-2 complex, impacting transcription and genomic stability.

Keywords:
BRCA2COP9Dss1Sem1TREX-2gene gatinggenome instabilitymRNA exportproteasome

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Sem1/Dss1 is a conserved protein, known as a proteasome subunit and a stabilizer of BRCA2 in mammals.
  • Previous research established Sem1's role in proteasome function and BRCA2 stabilization.

Purpose of the Study:

  • To investigate the non-proteasomal functions of Sem1.
  • To elucidate Sem1's role in mRNA export and its association with other protein complexes.

Main Methods:

  • Investigated Sem1's role independent of the proteasome regulatory particle (RP).
  • Analyzed Sem1's association with the TREX-2 complex and the COP9 signalosome.
  • Assessed the impact of Sem1 on mRNA export, transcription elongation, and genomic stability.

Main Results:

  • Sem1 functions independently of the proteasome RP in mRNA export.
  • Sem1 is a component of the nuclear pore-associated TREX-2 complex, involved in DNA locus relocalization.
  • Sem1 is required for efficient mRNA export, transcription elongation, and maintaining genomic stability.
  • Sem1 also associates with the COP9 signalosome, involved in de-neddylation.

Conclusions:

  • Sem1 exhibits a versatile, non-proteasomal role in nuclear processes.
  • Sem1 is a key regulator of mRNA export, transcription, and genomic integrity via the TREX-2 complex.
  • Sem1's association with multiple complexes suggests a broader regulatory function in diverse cellular pathways.