Substrate Recognition in Nuclear Protein Quality Control Degradation Is Governed by Exposed Hydrophobicity That Correlates with Aggregation and Insolubility

• Published in: The Journal of biological chemistry 2013-03, Vol.288 (9), p.6130-6139
• Main Authors: Fredrickson, Eric K., Gallagher, Pamela S., Clowes Candadai, Sarah V., Gardner, Richard G.
• Format: Article
• Language: English
• Subjects: Hydrophobic and Hydrophilic Interactions; Hydrophobicity; Insolubility; Nuclear Proteins - genetics; Nuclear Proteins - metabolism; Proteasome; Protein Degradation; Protein Folding; Protein Synthesis and Degradation; Proteolysis; Saccharomyces cerevisiae - genetics; Saccharomyces cerevisiae - metabolism; Saccharomyces cerevisiae Proteins - genetics; Saccharomyces cerevisiae Proteins - metabolism; San1; Solubility; Ubiquitin; Ubiquitin Ligase; Ubiquitin-Protein Ligases - genetics; Ubiquitin-Protein Ligases - metabolism; Ubiquitination; Ubiquitylation
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.M112.406710

Misfolded proteins present an escalating deleterious challenge to cells over the course of their lifetime. One mechanism the cell possesses to prevent misfolded protein accumulation is their destruction by protein quality control (PQC) degradation systems. In eukaryotes, PQC degradation typically proceeds via multiple ubiquitin-protein ligases that act throughout the cell to ubiquitinate misfolded proteins for proteasome degradation. What the exact feature of misfolding that each PQC ubiquitin-protein ligase recognizes in their substrates remains an open question. Our previous studies of the budding yeast nuclear ubiquitin-protein ligase San1 indicated that it recognizes exposed hydrophobicity within its substrates, with the threshold of hydrophobicity equivalent to that of 5 contiguous hydrophobic residues. Here, we uncover an additional parameter: the nature of the exposed hydrophobicity that confers San1-mediated degradation correlates with significant protein insolubility. San1 particularly targets exposed hydrophobicity that leads to insolubility and aggregation above a certain threshold. Our studies presented here provide additional insight into the details of misfolded nuclear protein recognition and demonstrate that there is selectivity for the type of exposed hydrophobicity.