Hst3 is turned over by a replication stress-responsive SCF(Cdc4) phospho-degron.

Abstract	Hst3 is the histone deacetylase that removes histone H3K56 acetylation. H3K56 acetylation is a cell-cycle- and damage-regulated chromatin marker, and proper regulation of H3K56 acetylation is important for replication, genomic stability, chromatin assembly, and the response to and recovery from DNA damage. Understanding the regulation of enzymes that regulate H3K56 acetylation is of great interest, because the loss of H3K56 acetylation leads to genomic instability. HST3 is controlled at both the transcriptional and posttranscriptional level. Here, we show that Hst3 is targeted for turnover by the ubiquitin ligase SCF(Cdc4) after phosphorylation of a multisite degron. In addition, we find that Hst3 turnover increases in response to replication stress in a Rad53-dependent way. Turnover of Hst3 is promoted by Mck1 activity in both conditions. The Hst3 degron contains two canonical Cdc4 phospho-degrons, and the phosphorylation of each of these is required for efficient turnover both in an unperturbed cell cycle and in response to replication stress.
Authors	Ellen R Edenberg, Ajay A Vashisht, Benjamin R Topacio, James A Wohlschlegel, David P Toczyski
Journal	Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 111 Issue 16 Pg. 5962-7 (Apr 22 2014) ISSN: 1091-6490 [Electronic] United States
PMID	24715726 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
Chemical References	CDC4 protein, S cerevisiae Cell Cycle Proteins F-Box Proteins Histones Saccharomyces cerevisiae Proteins Ubiquitin-Protein Ligases Hst3 protein, S cerevisiae Histone Deacetylases Lysine
Topics	Acetylation Cell Cycle Proteins (metabolism) DNA Damage DNA Replication F-Box Proteins (metabolism) Histone Deacetylases (chemistry, metabolism) Histones (metabolism) Lysine (metabolism) Phosphorylation Proteolysis Saccharomyces cerevisiae (metabolism) Saccharomyces cerevisiae Proteins (chemistry, metabolism) Stress, Physiological Substrate Specificity Ubiquitin-Protein Ligases (metabolism)

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