Abstract:
:We have identified two fission yeast homologs of budding yeast Rad4 and human xeroderma pigmentosum complementation group C (XP-C) correcting protein, designated Rhp4A and Rhp4B. Here we show that the rhp4 genes encode NER factors that are required for UV-induced DNA damage repair in fission yeast. The rhp4A-deficient cells but not the rhp4B-deficient cells are sensitive to UV irradiation. However, the disruption of both rhp4A and rhp4B resulted in UV sensitivity that was greater than that of the rhp4A-deficient cells, revealing that Rhp4B plays a role in DNA repair on its own. Fission yeast has two pathways to repair photolesions on DNA, namely, nucleotide excision repair (NER) and UV-damaged DNA endonuclease-dependent excision repair (UVER). Studies with the NER-deficient rad13 and the UVER-deficient (Delta)uvde mutants showed the two rhp4 genes are involved in NER and not UVER. Assessment of the ability of the various mutants to remove cyclobutane pyrimidine dimers (CPDs) from the rbp2 gene locus indicated that Rhp4A is involved in the preferential repair of lesions on the transcribed DNA strand and plays the major role in fission yeast NER. Rhp4B in contrast acts as an accessory protein in non-transcribed strand (NTS) repair.
journal_name
DNA Repair (Amst)journal_title
DNA repairauthors
Fukumoto Y,Hiyama H,Yokoi M,Nakaseko Y,Yanagida M,Hanaoka Fdoi
10.1016/s1568-7864(02)00108-8keywords:
subject
Has Abstractpub_date
2002-10-01 00:00:00pages
833-45issue
10eissn
1568-7864issn
1568-7856pii
S1568786402001088journal_volume
1pub_type
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