title: PARP-1 regulates chromatin structure and transcription through a KDM5B-dependent pathway.
abstract: PARP-1 is an abundant nuclear enzyme that regulates gene expression, although the underlying mechanisms are unclear. We examined the interplay between PARP-1, histone 3 lysine 4 trimethylation (H3K4me3), and linker histone H1 in the chromatin-dependent control of transcription. We show that PARP-1 is required for a series of molecular outcomes at the promoters of PARP-1-regulated genes, leading to a permissive chromatin environment that allows loading of the RNA Pol II machinery. PARP-1 does so by (1) preventing demethylation of H3K4me3 through the PARylation, inhibition, and exclusion of the histone demethylase KDM5B; and (2) promoting the exclusion of H1 and the opening of promoter chromatin. Upon depletion of PARP-1, these outcomes do not occur efficiently. Interestingly, cellular signaling pathways can use the regulated depletion of PARP-1 to modulate these chromatin-related molecular outcomes. Collectively, our results help to elucidate the roles of PARP-1 in the regulation of chromatin structure and transcription.
authors.affiliation: Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Raga
authors.initials: R
authors.lastname: Krishnakumar
authors.forename: W Lee
authors.initials: WL
authors.lastname: Kraus
mesh_terms: D045744:Cell Line, Tumor; D002843:Chromatin / Q000201:enzymology* / Q000235:genetics; D005786:Gene Expression Regulation / Q000502:physiology*; D006657:Histones / Q000235:genetics / Q000378:metabolism; D006801:Humans; D056484:Jumonji Domain-Containing Histone Demethylases; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000502:physiology*; D012319:RNA Polymerase II / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D014158:Transcription, Genetic / Q000502:physiology*
chemical_list: D002843:Chromatin; D006657:Histones; D009687:Nuclear Proteins; D012097:Repressor Proteins; D056484:Jumonji Domain-Containing Histone Demethylases; C119611:KDM5B protein, human; C499320:PARP1 protein, human; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; D012319:RNA Polymerase II