Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 100, Issue 13, Pages 7551-7556Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1332299100
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- NCI NIH HHS [CA24014] Funding Source: Medline
- NIGMS NIH HHS [GM60415, R01 GM060415] Funding Source: Medline
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Heterochromatin formation in yeast involves deacetylation of histones, but the precise relationship between acetylation and the association of proteins such as Sir3, Sir4, and the histone deacetylase Sir2 with chromatin is still unclear. Here we show that Sir3 protein spreads to subtelomeric DNA in cells lacking the transcription-related histone acetyltransferases GCN5 and ELP3. Spreading correlates with hypoacetylation of lysines in the histone H3 tail and results in deacetylation of lysine 16 in histone H4. De-repression of genes situated very close to the ends of the chromosomes in gcn5 elp3 suggests that Sir3 spreads into subtelomeric DNA from the tip of the telomere. Interestingly, growth defects caused by gcn5 elp3 mutation can be suppressed by SIR deletion, suggesting that Sir proteins become detrimental for growth when chromatin is severely hypoacetylated.
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