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- W2082002010 abstract "Poly(ADP-ribose) polymerases (PARPs) comprise a growing family of enzymes known to be involved in genotoxic signaling and metabolic regulation. One of the latest family members, tankyrase 1, was shown to be involved in maintenance of telomere integrity. Here we expressed full-length tankyrase 1 and a fragment, termed T-PARP, spanning the poly(ADP-ribose) polymerase domain and characterized the enzymatic properties of the two proteins. Both, tankyrase 1 and T-PARP catalyze an auto poly(ADP-ribosyl)ation reaction with comparable catalytic activity. In contrast, (ADP-ribosyl)ation of TRF1, a previously described substrate, is strongly performed only by the full-length enzyme but not by T-PARP. Characterization of the poly(ADP-ribose) products reveals that tankyrase 1 synthesizes polymers with an average chain length of 20 units and no detectable branching of the polymers. Finally, we show that the catalytic efficiency of tankyrase 1, as expressed by the k(cat)/K(m) value, is approximately 150-fold lower compared to the basal activity of the poly(ADP-ribose) polymerase, PARP 1." @default.
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- W2082002010 date "2002-10-01" @default.
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- W2082002010 title "Functional Characterization of the Poly(ADP-ribose) Polymerase Activity of Tankyrase 1, a Potential Regulator of Telomere Length" @default.
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- W2082002010 doi "https://doi.org/10.1016/s0022-2836(02)00946-4" @default.
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