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Citation
Zolotarev, N., Maksimenko, O., Kyrchanova, O., Sokolinskaya, E., Osadchiy, I., Girardot, C., Bonchuk, A., Ciglar, L., Furlong, E.E.M., Georgiev, P. (2017). Opbp is a new architectural/insulator protein required for ribosomal gene expression.  Nucleic Acids Res. 45(21): 12285--12300.
FlyBase ID
FBrf0237459
Publication Type
Research paper
Abstract

A special class of poorly characterized architectural proteins is required for chromatin topology and enhancer-promoter interactions. Here, we identify Opbp as a new Drosophila architectural protein, interacting with CP190 both in vivo and in vitro. Opbp binds to a very restrictive set of genomic regions, through a rare sequence specific motif. These sites are co-bound by CP190 in vivo, and generally located at bidirectional promoters of ribosomal protein genes. We show that Opbp is essential for viability, and loss of opbp function, or destruction of its motif, leads to reduced ribosomal protein gene expression, indicating a functional role in promoter activation. As characteristic of architectural/insulator proteins, the Opbp motif is sufficient for distance-dependent reporter gene activation and enhancer-blocking activity, suggesting an Opbp-mediated enhancer-promoter interaction. Rather than having a constitutive role, Opbp represents a new type of architectural protein with a very restricted, yet essential, function in regulation of housekeeping gene expression.

PubMed ID
PubMed Central ID
PMC5716193 (PMC) (EuropePMC)
Associated Information
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Secondary IDs
    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Nucleic Acids Res.
    Title
    Nucleic Acids Research
    Publication Year
    1974-
    ISBN/ISSN
    0305-1048
    Data From Reference
    Genes (13)
    Physical Interactions (4)
    Cell Lines (1)