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Related Experiment Videos

Position and sequence requirements for poly(A) length regulation by the poly(A) limiting element.

J D Gupta1, H Gu, D R Schoenberg

  • 1Department of Molecular and Cellular Biochemistry, The Ohio State University, Columbus 43210, USA.

RNA (New York, N.Y.)
|July 17, 2001
PubMed
Summary
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The poly(A)-limiting element (PLE) controls pre-mRNA poly(A) tail length. Its location in the terminal exon is crucial for this function, with a pyrimidine-rich region being essential. A specific protein binds to functional PLEs.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Processing

Background:

  • The poly(A)-limiting element (PLE) is a cis-acting sequence that limits poly(A) tail length on pre-mRNA to less than 20 nucleotides.
  • Functional PLEs are found in various genes, indicating a widespread regulatory mechanism.

Purpose of the Study:

  • To further define the positional requirements for poly(A) length regulation by the PLE.
  • To identify the core sequence responsible for PLE function.
  • To investigate the protein interactions involved in PLE-mediated regulation.

Main Methods:

  • Deletion and modification of introns and splice sites.
  • Mutagenesis of the PLE sequence.
  • UV crosslinking assays with Hela nuclear extract.

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Main Results:

  • Poly(A) length control is dependent on the PLE's presence in the terminal exon; relocation to upstream exons or introns abolishes control.
  • Altering spacing between the PLE and splice sites or polyadenylation signals does not affect regulation.
  • A pyrimidine-rich region within the PLE is critical for its function.
  • A 62-kDa protein in Hela nuclear extract specifically binds to functional PLE RNA.

Conclusions:

  • The terminal exon localization is essential for poly(A) length control by the PLE.
  • The 5' pyrimidine-rich portion of the PLE is a key functional component.
  • A specific protein interaction likely mediates the PLE's regulatory activity.