title: Histone H3 lysine 14 (H3K14) acetylation facilitates DNA repair in a positioned nucleosome by stabilizing the binding of the chromatin Remodeler RSC (Remodels Structure of Chromatin).
abstract: Histone H3 acetylation is induced by UV damage in yeast and may play an important role in regulating the repair of UV photolesions in nucleosome-loaded genomic loci. However, it remains elusive how H3 acetylation facilitates repair. We generated a strongly positioned nucleosome containing homogeneously acetylated H3 at Lys-14 (H3K14ac) and investigated possible mechanisms by which H3K14 acetylation modulates repair. We show that H3K14ac does not alter nucleosome unfolding dynamics or enhance the repair of UV-induced cyclobutane pyrimidine dimers by UV photolyase. Importantly, however, nucleosomes with H3K14ac have a higher affinity for purified chromatin remodeling complex RSC (Remodels the Structure of Chromatin) and show greater cyclobutane pyrimidine dimer repair compared with unacetylated nucleosomes. Our study indicates that, by anchoring RSC, H3K14 acetylation plays an important role in the unfolding of strongly positioned nucleosomes during repair of UV damage.
authors: From Biochemistry and Biophysics, School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-7520.
authors: Ming-Rui
authors: MR
authors: Duan
authors: Michael J
authors: MJ
authors: Smerdon
mesh_terms: D000107:Acetylation / Q000528:radiation effects; D001483:Base Sequence; D042002:Chromatin Assembly and Disassembly; D004260:DNA Repair; D004271:DNA, Fungal / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D006657:Histones / Q000737:chemistry / Q000378:metabolism*; D008239:Lysine / Q000737:chemistry / Q000378:metabolism*; D008958:Models, Molecular; D009707:Nucleosomes / Q000737:chemistry / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000378:metabolism* / Q000528:radiation effects; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism*; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D004271:DNA, Fungal; D004268:DNA-Binding Proteins; D006657:Histones; D009707:Nucleosomes; C103337:RSC complex, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D008239:Lysine
keywords: Chromatin Histone Modification; Chromatin Remodeling; DNA Damage; DNA Repair; Nucleosome; UV Photolyase; Ultraviolet Radiation