Cold Temperature Induces the Reprogramming of Proteolytic Pathways in Yeast

J Biol Chem. 2016 Jan 22;291(4):1664-75. doi: 10.1074/jbc.M115.698662. Epub 2015 Nov 24.

Abstract

Despite much evidence of the involvement of the proteasome-ubiquitin signaling system in temperature stress response, the dynamics of the ubiquitylome during cold response has not yet been studied. Here, we have compared quantitative ubiquitylomes from a strain deficient in proteasome substrate recruitment and a reference strain during cold response. We have observed that a large group of proteins showing increased ubiquitylation in the proteasome mutant at low temperature is comprised by reverses suppressor of Ty-phenotype 5 (Rsp5)-regulated plasma membrane proteins. Analysis of internalization and degradation of plasma membrane proteins at low temperature showed that the proteasome becomes determinant for this process, whereas, at 30 °C, the proteasome is dispensable. Moreover, our observations indicate that proteasomes have increased capacity to interact with lysine 63-polyubiquitylated proteins during low temperature in vivo. These unanticipated observations indicate that, during cold response, there is a proteolytic cellular reprogramming in which the proteasome acquires a role in the endocytic-vacuolar pathway.

Keywords: Can1; Itr1; Rad23; Rpn10; endocytosis; low temperature; proteasome; protein degradation; ubiquitin; vacuole.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cold Temperature
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism
  • Proteasome Endopeptidase Complex / genetics
  • Proteasome Endopeptidase Complex / metabolism
  • Proteolysis
  • Saccharomyces cerevisiae / enzymology
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Ubiquitin / metabolism

Substances

  • Membrane Proteins
  • Saccharomyces cerevisiae Proteins
  • Ubiquitin
  • Proteasome Endopeptidase Complex