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The HECT E3 ubiquitin ligase Rsp5 is important for ubiquitin homeostasis in yeast
Author(s) -
Krsmanović Tamara,
Kölling Ralf
Publication year - 2004
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2004.10.006
Subject(s) - ubiquitin ligase , ubiquitin , nedd4 , microbiology and biotechnology , dna ligase , chemistry , biology , biochemistry , enzyme , gene
The HECT E3 ubiquitin ligase Rsp5, a yeast member of the Nedd4 family, has been implicated in many different aspects of cell physiology. Here, we present evidence that Rsp5 function is important for ubiquitin homeostasis. Several observations suggest that ubiquitin is limiting in the rsp5‐1 mutant. Reduced synthesis of ubiquitin appears to contribute to ubiquitin depletion. A transient inhibition of general protein synthesis is observed in a wildtype strain upon heat‐shock. While the wildtype cells quickly recover from this transient arrest, the rsp5‐1 cells remain arrested. This suggests that Rsp5 is important for recovery from heat‐induced protein synthesis arrest. Our results suggest that rsp5 phenotypes should be interpreted with caution, since some of the phenotypes could be simply the result of ubiquitin limitation.