Centrosome-associated zinc finger protein Cp190

UniProtKB accession:  Q24478

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UniProtKB description:  Plays a central role in chromatin domain organization and boundary function through recruitment by a range of insulator DNA-binding proteins, including ZIPIC, pita, CTCF, su(Hw) and others (PubMed:25342723, PubMed:33752739). Together with pita and CTCF cooperatively binds to and regulates the activity of the Miscadastral pigmentation (MCP) insulator (PubMed:25342723). Recruitment of Cp190 together with Chro/chromator induces chromatin decondensation (PubMed:33752739). Component of the gypsy chromatin insulator complex which is required for the function of the gypsy chromatin insulator and other endogenous chromatin insulators (PubMed:15574329). Chromatin insulators are regulatory elements that establish independent domains of transcriptional activity within eukaryotic genomes. Insulators have two defining properties; they can block the communication between an enhancer and a promoter when placed between them and can also buffer transgenes from position effect variegation (PEV). Insulators are proposed to structure the chromatin fiber into independent domains of differing transcriptional potential by promoting the formation of distinct chromatin loops to form topologically associating domains (TADs). This chromatin looping may involve the formation of insulator bodies, where homotypic interactions between individual subunits of the insulator complex could promote the clustering of widely spaced insulators at the nuclear periphery. Within the gypsy insulator complex, this protein may directly bind to insulator DNA at sites distinct from those recognized by su(Hw) (PubMed:15574329). Required during embryogenesis for axial expansion, an actin/myosin dependent process that distributes the dividing nuclei along the anterior-posterior axis of the syncytial embryo (PubMed:16051175). Localizes to centrosomes and recruits CP60 during mitosis but does not appear to play a crucial role in organizing centrosomal microtubules (PubMed:14996941, PubMed:16051175).