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Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle
10:05

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

Control of signaling in a MAP-kinase pathway by an RNA-binding protein

Susanne Prinz1, Christine Aldridge, Stephen A Ramsey

  • 1Institute for Systems Biology, Seattle, Washington, United States of America.

Plos One
|March 1, 2007
PubMed

Insights

Mpt5, a PUF-family protein, regulates yeast differentiation by repressing key components of the MAP-kinase pathway. This RNA-binding protein prevents inappropriate cell differentiation, highlighting a link between signaling and RNA regulation.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Gene Regulation

Background:

  • Signaling-protein messenger RNAs (mRNAs) often possess lengthy untranslated regions (UTRs).
  • These UTRs contain binding sites crucial for RNA-binding proteins that modulate gene expression.
  • The MAP-kinase pathway in yeast controls differentiation into the filamentous form.

Purpose of the Study:

  • To investigate the role of the PUF-family RNA-binding protein Mpt5 in regulating the yeast MAP-kinase pathway.
  • To understand how Mpt5 influences cell differentiation.

Main Methods:

  • Analysis of Mpt5's interaction with MAP-kinase pathway components.
  • Measurement of protein levels and kinase activity.
  • Assessment of Mpt5's effect on yeast differentiation.

Main Results:

  • Mpt5 was found to repress protein levels of Ste7 MAP-kinase kinase and Tec1 transcriptional activator.
  • Mpt5 negatively regulates the kinase activity of Kss1 MAP kinase.
  • Mpt5 specifically inhibits pathway output in unstimulated cells, preventing aberrant differentiation.

Conclusions:

  • Mpt5 acts as a repressor within the yeast MAP-kinase pathway, controlling filamentous differentiation.
  • This study demonstrates Mpt5's role in preventing inappropriate cell differentiation.
  • The findings suggest a potential genome-wide regulatory mechanism at the intersection of signaling networks and RNA-binding proteins.

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