Journal article
A single amino acid change in histone H4 enhances UV survival and DNA repair in yeast
Nucleic acids research, Vol.36(11), pp.3857-3866
06/2008
Handle:
https://hdl.handle.net/2376/116993
PMID: 18508805
Abstract
Single amino acid changes at specific DNA contacts of histones H3 and H4 generate SWI/SNF-independent (Sin) mutants in yeast. We have analyzed the effect of the Sin mutation at R45 of histone H4 on cell survival following UV irradiation, nucleotide excision repair (NER) and chromatin structure. We find that this mutation renders yeast cells more resistant to UV damage and enhances NER at specific chromatin loci. In the transcriptionally silent
HML
, repressed
GAL10
and the constitutively active
RPB2
loci, H4 R45 mutants exhibit enhanced repair of UV-induced cyclobutane pyrimidine dimers (CPDs) compared to wild-type (wt). However, the H4 R45 mutation does not increase the transcription of NER genes, disrupt transcriptional silencing of the
HML
locus or alter repression in the
GAL10
locus. We have further shown that the H4 R45C mutation increases the accessibility of nucleosome DNA in chromatin to exogenous nucleases and may expedite nucleosome rearrangements during NER. Taken together, our results indicate that the increased repair observed in Sin mutants is a direct effect of the altered chromatin landscape caused by the mutation, suggesting that such subtle changes in the conserved histone residues can influence the accessibility of DNA repair factors in chromatin.
Metrics
4 Record Views
Details
- Title
- A single amino acid change in histone H4 enhances UV survival and DNA repair in yeast
- Creators
- Ronita Nag - Biochemistry and Biophysics, School of Molecular Biosciences,Washington State University, Pullman, WA 99164-4660Feng Gong - Biochemistry and Biophysics, School of Molecular Biosciences,Washington State University, Pullman, WA 99164-4660Deirdre Fahy - Biochemistry and Biophysics, School of Molecular Biosciences,Washington State University, Pullman, WA 99164-4660Michael J Smerdon - Biochemistry and Biophysics, School of Molecular Biosciences,Washington State University, Pullman, WA 99164-4660
- Publication Details
- Nucleic acids research, Vol.36(11), pp.3857-3866
- Academic Unit
- Molecular Biosciences, School of
- Publisher
- Oxford University Press
- Identifiers
- 99900548116301842
- Language
- English
- Resource Type
- Journal article