BAIT
SIR2
MAR1, NAD-dependent histone deacetylase SIR2, L000001895, YDL042C
Conserved NAD+ dependent histone deacetylase of the Sirtuin family; involved in regulation of lifespan; plays roles in silencing at HML, HMR, telomeres, and the rDNA locus; negatively regulates initiation of DNA replication; functions as a regulator of autophagy like mammalian homolog SIRT1, and also of mitophagy; SIR2 has a paralog, HST1, that arose from the whole genome duplication
GO Process (8)
GO Function (5)
GO Component (6)
Gene Ontology Biological Process
- chromatin assembly or disassembly [IDA]
- chromatin silencing at rDNA [IMP]
- chromatin silencing at silent mating-type cassette [IMP]
- chromatin silencing at telomere [IMP]
- chronological cell aging [IMP]
- negative regulation of DNA recombination [IGI]
- negative regulation of DNA replication [IMP]
- replicative cell aging [IMP]
Gene Ontology Molecular Function
Gene Ontology Cellular Component
Saccharomyces cerevisiae (S288c)
PREY
FUN30
DNA-dependent ATPase FUN30, L000000645, YAL019W
Snf2p family member with ATP-dependent chromatin remodeling activity; has a role in silencing at the mating type locus, telomeres and centromeres; enriched at centromeres and is required for correct chromatin structure around centromeres, as well as at the boundary element of the silent HMR; recruited to DNA double-strand breaks (DSBs) where it promotes 5' strand resection of DSBs; potential Cdc28p substrate
GO Process (7)
GO Function (3)
GO Component (4)
Gene Ontology Biological Process
- ATP-dependent chromatin remodeling [IMP]
- DNA double-strand break processing [IMP]
- chromatin silencing at rDNA [IMP]
- chromatin silencing at silent mating-type cassette [IMP]
- chromatin silencing at telomere [IMP]
- heterochromatin assembly involved in chromatin silencing [IMP]
- heterochromatin maintenance involved in chromatin silencing [IGI, IMP]
Gene Ontology Molecular Function
Gene Ontology Cellular Component
Saccharomyces cerevisiae (S288c)
Phenotypic Suppression
A genetic interaction is inferred when mutation or over expression of one gene results in suppression of any phenotype (other than lethality/growth defect) associated with mutation or over expression of another gene.
Publication
Sir2 and Fun30 regulate ribosomal DNA replication timing via MCM helicase positioning and nucleosome occupancy.
The association between late replication timing and low transcription rates in eukaryotic heterochromatin is well known, yet the specific mechanisms underlying this link remain uncertain. In Saccharomyces cerevisiae, the histone deacetylase Sir2 is required for both transcriptional silencing and late replication at the repetitive ribosomal DNA (rDNA) arrays. We have previously reported that in the absence of SIR2, a de-repressed ... [more]
Elife Jan. 20, 2025; 13(); [Pubmed: 39831552]
Throughput
- Low Throughput
Ontology Terms
- cell cycle progression (APO:0000253)
Additional Notes
- fun30 deletion suppresses the increase in activated rDNA origins caused by sir2 deletion
Curated By
- BioGRID