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An Oligonucleotide-based Tandem RNA Isolation Procedure to Recover Eukaryotic mRNA-Protein Complexes
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Sequence-specific RNA binding mediated by the RNase PH domain of components of the exosome

John R Anderson1, Devi Mukherjee, Karthika Muthukumaraswamy

  • 1Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado 80523, USA.

RNA (New York, N.Y.)
|August 17, 2006
PubMed

Insights

The RNase PH domain of PM-Scl-75 binds AU-rich elements in RNA. This domain and similar ones from other proteins show affinity for U- and AU-rich sequences, impacting RNA biology.

Area of Science:

  • Molecular Biology
  • RNA Biology
  • Protein Domains

Background:

  • The human exosome complex, including PM-Scl-75, is crucial for RNA maturation and mRNA decay.
  • PM-Scl-75 was previously shown to interact with RNAs containing AU-rich instability elements.

Purpose of the Study:

  • To identify the specific domain responsible for PM-Scl-75's sequence-specific RNA binding.
  • To investigate the RNA-binding capabilities of RNase PH domains from various proteins.

Main Methods:

  • Deletion mutant analysis of PM-Scl-75 to pinpoint the RNA-binding domain.
  • Biochemical assays to assess binding affinities of different RNase PH domains to AU-rich RNAs.
  • Competition assays using homopolymeric RNAs to characterize binding specificity.

Main Results:

  • A 266 amino acid fragment, the RNase PH domain, mediates sequence-specific binding to AU-rich elements.
  • RNase PH domains from OIP2, RRP41, and E. coli polynucleotide phosphorylase also bind AU-rich RNAs with comparable affinities.
  • Poly(U) efficiently competed the binding of the PM-Scl-75 RNase PH domain, while other homopolymers did not.

Conclusions:

  • RNase PH domains generally exhibit affinity for U- and AU-rich RNA sequences.
  • These findings expand the known functions of proteins containing RNase PH domains in RNA biology.

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