title: p300-mediated acetylation of histone H3 lysine 56 functions in DNA damage response in mammals.
abstract: The packaging of newly replicated and repaired DNA into chromatin is crucial for the maintenance of genomic integrity. Acetylation of histone H3 core domain lysine 56 (H3K56ac) has been shown to play a crucial role in compaction of DNA into chromatin following replication and repair in Saccharomyces cerevisiae. However, the occurrence and function of such acetylation has not been reported in mammals. Here we show that H3K56 is acetylated and that this modification is regulated in a cell cycle-dependent manner in mammalian cells. We also demonstrate that the histone acetyltransferase p300 acetylates H3K56 in vitro and in vivo, whereas hSIRT2 and hSIRT3 deacetylate H3K56ac in vivo. Further we show that following DNA damage H3K56 acetylation levels increased, and acetylated H3K56, which is localized at the sites of DNA repair. It also colocalized with other proteins involved in DNA damage signaling pathways such as phospho-ATM, CHK2, and p53. Interestingly, analysis of occurrence of H3K56 acetylation using ChIP-on-chip revealed its genome-wide spread, affecting genes involved in several pathways that are implicated in tumorigenesis such as cell cycle, DNA damage response, DNA repair, and apoptosis.
authors.affiliation: Department of Biology, Institute of Life Sciences, University of Hyderabad Campus, Hyderabad 500046, India.
authors.forename: Rahul K
authors.initials: RK
authors.lastname: Vempati
authors.forename: Ranveer S
authors.initials: RS
authors.lastname: Jayani
authors.forename: Dimple
authors.initials: D
authors.lastname: Notani
authors.forename: Amrita
authors.initials: A
authors.lastname: Sengupta
authors.forename: Sanjeev
authors.initials: S
authors.lastname: Galande
authors.forename: Devyani
authors.initials: D
authors.lastname: Haldar
mesh_terms: D000107:Acetylation; D000818:Animals; D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D064447:Checkpoint Kinase 2; D004249:DNA Damage / Q000502:physiology*; D004260:DNA Repair / Q000502:physiology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D006367:HeLa Cells; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D019169:Jurkat Cells; D051379:Mice; D041681:NIH 3T3 Cells; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae; D015398:Signal Transduction / Q000502:physiology; D056565:Sirtuin 2 / Q000235:genetics / Q000378:metabolism; D056566:Sirtuin 3 / Q000235:genetics / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism; D050880:p300-CBP Transcription Factors / Q000235:genetics / Q000378:metabolism*; D000099224:p300-CBP-Associated Factor
chemical_list: D064007:Ataxia Telangiectasia Mutated Proteins; D018797:Cell Cycle Proteins; D064447:Checkpoint Kinase 2; D004268:DNA-Binding Proteins; D006657:Histones; D017346:Protein Serine-Threonine Kinases; D056565:Sirtuin 2; D056566:Sirtuin 3; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C495901:TP53 protein, human; C576324:ATM protein, human; C576325:Atm protein, mouse; C578634:CHEK2 protein, human; C578633:Chek2 protein, mouse; C474199:SIRT2 protein, human; C466093:SIRT3 protein, human