BAIT

SIR3

CMT1, MAR2, STE8, chromatin-silencing protein SIR3, L000001896, YLR442C
Silencing protein; interacts with Sir2p, Sir4p, and histone H3 and H4 tails to establish transcriptionally silent chromatin state; required for spreading of silenced chromatin; recruited to chromatin through interaction with Rap1p; C-terminus (residues 840-978) assumes variant winged helix-turn-helix (wH) fold that mediates homodimerization, which is critical for holo-SIR complex loading; SIR3 has a paralog, ORC1, that arose from the whole genome duplication
Saccharomyces cerevisiae (S288c)
PREY

DNL4

LIG4, DNA ligase (ATP) DNL4, L000003479, YOR005C
DNA ligase required for nonhomologous end-joining (NHEJ); forms stable heterodimer with required cofactor Lif1p, interacts with Nej1p; involved in meiosis, not essential for vegetative growth; mutations in human ortholog lead to ligase IV syndrome and Dubowitz syndrome
GO Process (3)
GO Function (1)
GO Component (2)

Gene Ontology Biological Process

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

Sir3 heterochromatin protein promotes non-homologous end joining by direct inhibition of?Sae2.

Bordelet H, Costa R, Brocas C, Depagne J, Veaute X, Busso D, Batte A, Guerois R, Marcand S, Dubrana K

Heterochromatin is a conserved feature of eukaryotic chromosomes, with central roles in gene expression regulation and maintenance of genome stability. How heterochromatin proteins regulate DNA repair remains poorly described. In the yeast Saccharomyces cerevisiae, the silent information regulator (SIR) complex assembles heterochromatin-like chromatin at sub-telomeric chromosomal regions. SIR-mediated repressive chromatin limits DNA double-strand break (DSB) resection, thus protecting damaged chromosome ... [more]

EMBO J Dec. 04, 2021; 41(1);e108813 [Pubmed: 34817085]

Throughput

  • Low Throughput

Ontology Terms

  • phenotype: chromosome/plasmid maintenance (APO:0000143)

Additional Notes

  • DSB survival from Sir3 overexpression is dependent on DNL4
  • Figure 1

Curated By

  • BioGRID