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Finding the right partner: science or ART?

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Researchers discovered arrestin-related proteins (ARTs) that specify which plasma membrane proteins get ubiquitinated. This process is crucial for maintaining the correct cell surface proteins in budding yeast.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Plasma membrane proteins are regulated by ubiquitination, signaling endocytosis and degradation.
  • The Rsp5 enzyme in budding yeast is responsible for this ubiquitination process.
  • Specificity in targeting plasma membrane proteins for degradation is not fully understood.

Purpose of the Study:

  • To identify novel factors that confer specificity to Rsp5-mediated ubiquitination of plasma membrane proteins.
  • To understand the role of these factors in maintaining cell surface protein homeostasis.

Main Methods:

  • Yeast genetics
  • Protein biochemistry
  • Ubiquitination assays

Main Results:

  • Identification of an arrestin-related protein (ART) family.
  • ARTs act as adaptors for the Rsp5 ubiquitin ligase.
  • ARTs confer specificity to the ubiquitination of specific plasma membrane proteins.

Conclusions:

  • ARTs are key regulators of plasma membrane protein turnover.
  • These adaptors ensure the correct repertoire of cell surface proteins is maintained.
  • Discovery provides insight into the specificity mechanisms of ubiquitin ligases.