Jox T, Buxa MK, Bohla D, Ullah I, Mačinković I, Brehm A, Bartkuhn M, Renkawitz R. Drosophila CP190- and dCTCF-mediated enhancer blocking is augmented by SUMOylation.
Epigenetics Chromatin 2017;
10:32. [PMID:
28680483 PMCID:
PMC5496309 DOI:
10.1186/s13072-017-0140-6]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 06/27/2017] [Indexed: 12/02/2022] Open
Abstract
Background
Chromatin insulators shield promoters and chromatin domains from neighboring enhancers or chromatin regions with opposing activities. Insulator-binding proteins and their cofactors mediate the boundary function. In general, covalent modification of proteins by the small ubiquitin-like modifier (SUMO) is an important mechanism to control the interaction of proteins within complexes.
Results
Here we addressed the impact of dSUMO in respect of insulator function, chromatin binding of insulator factors and formation of insulator speckles in Drosophila. SUMOylation augments the enhancer blocking function of four different insulator sequences and increases the genome-wide binding of the insulator cofactor CP190.
Conclusions
These results indicate that enhanced chromatin binding of SUMOylated CP190 causes fusion of insulator speckles, which may allow for more efficient insulation.
Electronic supplementary material
The online version of this article (doi:10.1186/s13072-017-0140-6) contains supplementary material, which is available to authorized users.
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