BAIT
TOP1
MAK1, MAK17, DNA topoisomerase 1, L000002319, YOL006C
Topoisomerase I; nuclear enzyme that relieves torsional strain in DNA by cleaving and re-sealing the phosphodiester backbone; relaxes both positively and negatively supercoiled DNA; functions in replication, transcription, and recombination; role in processing ribonucleoside monophosphates in genomic DNA into irreversible single-strand breaks
GO Process (9)
GO Function (2)
GO Component (3)
Gene Ontology Biological Process
- DNA strand elongation involved in DNA replication [IMP]
- DNA topological change [IDA, IMP]
- chromatin assembly or disassembly [IMP]
- chromatin silencing at rDNA [IMP]
- mitotic chromosome condensation [IGI, IMP]
- nuclear migration [IGI, IMP]
- regulation of mitotic recombination [IMP]
- regulation of transcription from RNA polymerase II promoter [IMP]
- transcription elongation from RNA polymerase II promoter [IMP]
Gene Ontology Molecular Function
Saccharomyces cerevisiae (S288c)
PREY
RNH1
L000001653, YMR234W
Ribonuclease H1; able to bind double-stranded RNAs and RNA-DNA hybrids; associates with RNAse polymerase I.
GO Process (1)
GO Function (1)
GO Component (2)
Gene Ontology Biological Process
Gene Ontology Molecular Function
Saccharomyces cerevisiae (S288c)
Synthetic Lethality
A genetic interaction is inferred when mutations or deletions in separate genes, each of which alone causes a minimal phenotype, result in lethality when combined in the same cell under a given condition.
Publication
Loss of Topoisomerase I leads to R-loop-mediated transcriptional blocks during ribosomal RNA synthesis.
Pre-rRNA transcription by RNA Polymerase I (Pol I) is very robust on active rDNA repeats. Loss of yeast Topoisomerase I (Top1) generated truncated pre-rRNA fragments, which were stabilized in strains lacking TRAMP (Trf4/Trf5-Air1/Air2-Mtr4 polyadenylation complexes) or exosome degradation activities. Loss of both Top1 and Top2 blocked pre-rRNA synthesis, with pre-rRNAs truncated predominately in the 18S 5' region. Positive supercoils in ... [more]
Genes Dev. Jul. 15, 2010; 24(14);1546-58 [Pubmed: 20634320]
Throughput
- Low Throughput
Ontology Terms
- phenotype: inviable (APO:0000112)
- phenotype: rna accumulation (APO:0000224)
- phenotype: protein/peptide distribution (APO:0000209)
Additional Notes
- conditional triple mutants show decreased RNA synthesis and polymerase pileups
- genetic complex
- triple mutants are synthetic lethal
Curated By
- BioGRID