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Co-purification of a small RNA species with multicatalytic proteinase (proteasome) from rat liver

H E Skilton1, I C Eperon, A J Rivett

  • 1Department of Biochemistry, University of Leicester, UK.

FEBS Letters
|February 25, 1991
PubMed

Insights

Multicatalytic proteinase (MCP) particles from rat liver consistently co-purify with a distinct RNA molecule. This finding suggests the existence of multiple MCP populations within rat liver cells.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Conflicting findings exist regarding RNA presence in prosomes, proteasomes, or multicatalytic proteinase (MCP) particles.
  • Understanding the composition of MCP is crucial for elucidating its cellular functions.

Purpose of the Study:

  • To investigate the consistent presence and nature of RNA within rat liver MCP particles.
  • To resolve discrepancies in previous studies concerning RNA association with MCP.

Main Methods:

  • Isolation of MCP from rat liver using four distinct purification protocols.
  • Analysis of co-purifying nucleic acids using gel electrophoresis and size determination.

Main Results:

  • A prominent RNA band, approximately 80 nucleotides in length, was consistently detected in all MCP preparations.
  • The molar ratio of detected RNA to MCP particles was less than one molecule per particle.

Conclusions:

  • Rat liver MCP particles are associated with a specific small RNA molecule.
  • The low RNA-to-MCP ratio suggests the presence of at least two distinct MCP populations in rat liver cells: one RNA-containing and one RNA-lacking.

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