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- W2018020379 abstract "Tankyrase 1, a human telomeric poly(ADP-ribose) polymerase, was originally identified through its interaction with TRF1, a negative regulator of telomere length. Tankyrase 1 ADP-ribosylates TRF1 in vitro, and its overexpression induces telomere elongation in human cancer cells. In addition to its telomeric localization, tankyrase 1 resides at multiple subcellular sites, suggesting additional functions for this protein. Here we identify TAB182, a novel tankyrase 1-binding protein of 182 kDa. TAB182 displays a complex pattern of subcellular localization. TAB182 localizes to the nucleus in a heterochromatic staining pattern and to the cytoplasm, where it co-stains with the cortical actin network. TAB182 coimmunoprecipitates with tankyrase 1 from human cells and serves as an acceptor of poly(ADP-ribosyl)ation by tankyrase 1 in vitro. Like TRF1, TAB182 binds to the ankyrin domain (comprising 24 ankyrin repeats) of tankyrase 1. Surprisingly, dissection of this domain reveals multiple discrete and overlapping binding sites for TRF1 and TAB182. Thus, we demonstrate five well conserved ankyrin repeat clusters in tankyrase 1. Although each of the five ankyrin repeat clusters independently binds to TRF1, only three of the five bind toTAB182. These findings suggest that tankyrase 1 may act as a scaffold for large molecular mass complexes made up of multiple binding proteins. We discuss potential roles for tankyrase 1-mediated higher order complexes at telomeres and at other subcellular sites." @default.
- W2018020379 created "2016-06-24" @default.
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- W2018020379 date "2002-04-01" @default.
- W2018020379 modified "2023-10-06" @default.
- W2018020379 title "The Telomeric Poly(ADP-ribose) Polymerase, Tankyrase 1, Contains Multiple Binding Sites for Telomeric Repeat Binding Factor 1 (TRF1) and a Novel Acceptor, 182-kDa Tankyrase-binding Protein (TAB182)" @default.
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- W2018020379 doi "https://doi.org/10.1074/jbc.m112266200" @default.
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