TNKS1BP1, has a calculated molecular mass of 182 kD. It is predicted to contain 2 basic regions at its N and C termini and a large internal acidic region. The C terminus also contains 2 potential nuclear localization signals. Northern blot analysis detected transcripts of 7, 4.4, and 2.3 kb in multiple tissues, with highest expression in testis, ovary, and lung, and minimal expression in brain and peripheral blood leukocytes. By immunolocalization of endogenous TAB182 in 2 human cell lines, Seimiya and Smith (2002) found TAB182 in the cytoplasm, where it colocalized with cortical actin, and in the nucleus. The nuclear staining was similar to that found for heterochromatin proteins. In a synchronized population of HeLa cells, TAB182 associated with chromosomes throughout mitosis.
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