The approximately 142 kDa Tankyrase protein is ubiquitously expressed in mammalian cells and is localized to human telomeres. It has homology to ankyrins and to the catalytic domain of poly (adenosine diphosphate-ribose) polymerase (PARP). Tankyrase binds to TRF1 (telomeric repeat binding factor-1), which negatively regulates the maintenance of telomere length.
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