ABF1-binding sites promote efficient global genome nucleotide excision repair.
Global genome nucleotide excision repair (GG-NER) removes DNA damage from nontranscribing DNA. In Saccharomyces cerevisiae, the RAD7 and RAD16 genes are specifically required for GG-NER. We have reported that autonomously replicating sequence-binding factor 1 (ABF1) protein forms a stable complex with Rad7 and Rad16 proteins. ABF1 functions in transcription, replication, gene silencing, and NER in yeast. Here we show that binding of ABF1 to its DNA recognition sequence found at multiple genomic locations promotes efficient GG-NER in yeast. Mutation of the I silencer ABF1-binding site at the HMLalpha locus caused loss of ABF1 binding, which resulted in a domain of reduced GG-NER efficiency on one side of the ABF1-binding site. During GG-NER, nucleosome positioning at this site was not altered, and this correlated with an inability of the GG-NER complex to reposition nucleosomes in vitro.We discuss how the GG-NER complex might facilitate GG-NER while preventing unregulated gene transcription during this process.
Yu
Shirong
S
Department of Pathology, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4XN, United Kingdom.
Smirnova
Julia B
JB
Friedberg
Errol C
EC
Stillman
Bruce
B
Akiyama
Masahiro
M
Owen-Hughes
Tom
T
Waters
Raymond
R
Reed
Simon H
SH
D001665:Binding Sites; D004260:DNA Repair / Q000235:genetics*; D004271:DNA, Fungal / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D016681:Genome, Fungal / Q000235:genetics*; D009154:Mutation / Q000235:genetics; D009707:Nucleosomes / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
C061886:ABF1 protein, S cerevisiae; D004271:DNA, Fungal; D004268:DNA-Binding Proteins; D009707:Nucleosomes; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors