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Related Experiment Videos

RNA recognition by the human polyadenylation factor CstF

Y Takagaki1, J L Manley

  • 1Department of Biological Sciences, Columbia University, New York, New York 10027, USA.

Molecular and Cellular Biology
|July 1, 1997
PubMed
Summary

The RNA binding domain of CstF-64 protein recognizes GU-rich sequences, acting as a functional downstream element for mRNA polyadenylation. This study reveals conserved and divergent recognition motifs between mammalian and yeast polyadenylation factors.

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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Biochemistry

Background:

  • mRNA polyadenylation requires specific RNA sequences: AAUAAA and a downstream element.
  • The CstF complex, particularly CstF-64, is known to interact with downstream sequences, but the precise mechanism remains unclear.

Purpose of the Study:

  • To determine if the RNA binding domain (RBD) of CstF-64 is sufficient for recognizing downstream polyadenylation elements.
  • To investigate the nature of the CstF recognition motif and compare it with yeast homologs.

Main Methods:

  • Selection-amplification (SELEX) using a glutathione S-transferase (GST)-CstF-64 RBD fusion protein.
  • In vitro binding assays with intact CstF.
  • Reconstituted CstF-dependent cleavage assays.
  • Comparative SELEX with yeast RNA15 RBD.

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Main Results:

  • The CstF-64 RBD selected and bound GU-rich sequences, confirming its role in recognizing downstream elements.
  • Selected sequences were functional in polyadenylation assays and recognized by intact CstF with high affinity.
  • Mammalian and yeast CstF homologs recognize distinct sequence motifs despite structural similarity.

Conclusions:

  • The 64K RBD of CstF is sufficient to define a functional downstream polyadenylation element.
  • GU- and U-rich sequences represent variants of a single CstF recognition motif.
  • Evolutionary divergence in RNA-binding domains leads to distinct sequence recognition in mRNA 3'-end processing.