Abstract:
:The transcriptional shift from repression to activation of target genes is crucial for the fidelity of Notch responses through incompletely understood mechanisms that likely involve chromatin-based control. To activate silenced genes, repressive chromatin marks are removed and active marks must be acquired. Histone H3 lysine-4 (H3K4) demethylases are key chromatin modifiers that establish the repressive chromatin state at Notch target genes. However, the counteracting histone methyltransferase required for the active chromatin state remained elusive. Here, we show that the RBP-J interacting factor SHARP is not only able to interact with the NCoR corepressor complex, but also with the H3K4 methyltransferase KMT2D coactivator complex. KMT2D and NCoR compete for the C-terminal SPOC-domain of SHARP. We reveal that the SPOC-domain exclusively binds to phosphorylated NCoR. The balance between NCoR and KMT2D binding is shifted upon mutating the phosphorylation sites of NCoR or upon inhibition of the NCoR kinase CK2β. Furthermore, we show that the homologs of SHARP and KMT2D in Drosophila also physically interact and control Notch-mediated functions in vivo Together, our findings reveal how signaling can fine-tune a committed chromatin state by phosphorylation of a pivotal chromatin-modifier.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Oswald F,Rodriguez P,Giaimo BD,Antonello ZA,Mira L,Mittler G,Thiel VN,Collins KJ,Tabaja N,Cizelsky W,Rothe M,Kühl SJ,Kühl M,Ferrante F,Hein K,Kovall RA,Dominguez M,Borggrefe Tdoi
10.1093/nar/gkw105subject
Has Abstractpub_date
2016-06-02 00:00:00pages
4703-20issue
10eissn
0305-1048issn
1362-4962pii
gkw105journal_volume
44pub_type
杂志文章abstract::We have determined the NMR solution structures of the quadruplexes formed by d(TGLGLT) and d(TL4T), where L denotes LNA (locked nucleic acid) modified G-residues. Both structures are tetrameric, parallel and right-handed and the native global fold of the corresponding DNA quadruplex is retained upon introduction of th...
journal_title:Nucleic acids research
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