Abstract
Tankyrase 1 (TNKS) and tankyrase 2 (TNKS2) belong to the poly(ADP-ribose) polymerase family of proteins, which use nicotinamide adenine dinucleotide to modify substrate proteins with ADP-ribose modifications. Emerging evidence has revealed the pathological relevance of TNKS and TNKS2, and identified these two enzymes as potential drug targets. However, the cellular functions and regulatory mechanisms of TNKS/2 are still largely unknown. Through a proteomic analysis, we defined the protein-protein interaction network for human TNKS/2 and revealed more than 100 high-confidence interacting proteins with numerous biological functions in this network. Finally, through functional validation, we uncovered a role for TNKS/2 in peroxisome homeostasis and determined that this function is independent of TNKS enzyme activities. Our proteomic study of the TNKS/2 protein interaction network provides a rich resource for further exploration of tankyrase functions in numerous cellular processes.
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