Abstract:
:In human cells DNA damage caused by UV light is mainly repaired by the nucleotide excision repair pathway. This mechanism involves dual incisions on both sides of the damage catalyzed by two nucleases. In mammalian cells XPG cleaves 3' of the DNA lesion while the ERCC1-XPF complex makes the 5' incision. The amino acid sequence of the human excision repair protein ERCC1 is homologous with the fission yeast Swi10 protein. In order to test whether these proteins are functional homologues, we overexpressed the human gene in a Schizosaccharomyces pombe swi10 mutant. A swi10 mutation has a pleiotropic effect: it reduces the frequency of mating type switching (a mitotic transposition event from a silent cassette into the expression site) and causes increased UV sensitivity. We found that the full-length ERCC1 gene only complements the transposition defect of the fission yeast mutant, while a C-terminal truncated ERCC1 protein also restores the DNA repair capacity of the yeast cells. Using the two-hybrid system of Saccharomyces cerevisiae we show that only the truncated human ERCC1 protein is able to interact with the S . pombe Rad16 protein, which is the fission yeast homologue of human XPF. This is the first example yet known that a human gene can correct a yeast mutation in nucleotide excision repair.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Rödel C,Jupitz T,Schmidt Hdoi
10.1093/nar/25.14.2823subject
Has Abstractpub_date
1997-07-15 00:00:00pages
2823-7issue
14eissn
0305-1048issn
1362-4962pii
gka452journal_volume
25pub_type
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