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Related Experiment Videos

Coupling of termination, 3' processing, and mRNA export.

C M Hammell1, Stefan Gross, Daniel Zenklusen

  • 1Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.

Molecular and Cellular Biology
|August 23, 2002
PubMed
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This study reveals that mRNA processing and export are coupled in yeast. Defects in 3' end processing, including polyadenylation and termination, can impair mRNA export, suggesting shared molecular machinery.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • mRNA export from the nucleus is crucial for gene expression.
  • Proper 3' end processing of mRNA, including cleavage and polyadenylation, is essential for its function and export.
  • The coupling of mRNA processing and export pathways is not fully understood.

Purpose of the Study:

  • To identify genes involved in mRNA export in Saccharomyces cerevisiae.
  • To investigate the relationship between 3' end mRNA processing and nuclear export.
  • To explore potential mechanistic links between these two processes.

Main Methods:

  • Genetic screening in yeast to isolate mutants with defects in mRNA export.
  • Analysis of mRNA 3' end processing, including polyadenylation and termination, in wild-type and mutant strains.

Related Experiment Videos

  • In vivo and in vitro assays to study protein-protein interactions and functional roles of specific factors.

    • Main Results:

    • Mutants defective in 3' end processing factors, such as poly(A) polymerase (PAP1), were identified.
    • Several mRNA export mutants exhibited defects in 3' end processing, including improper polymerase II (Pol II) termination and hyperpolyadenylation.
    • The export receptor Xpo1p was found to interact with 3' processing factors and stimulate 3' maturation in vitro.
    • Overexpression of Rat8p/Dbp5p suppressed defects in both 3' processing and mRNA export in xpo1-1 cells.

    Conclusions:

    • mRNA 3' end processing and nuclear export are mechanistically coupled processes.
    • Shared factors or pathways likely link mRNA maturation and export.
    • Xpo1p and Rat8p/Dbp5p play roles in coordinating these processes.