PTEN can bind tankyrases TNKS (TNKS1) and TNKS2. The interaction involves the tankyrase binding motif at the N-terminus of PTEN (RYQEDG). TNKS and TNKS2 poly-ADP-ribosylate (PARylate) PTEN on glutamic acid residues E40 and E150 and on aspartic acid residue D326. PTEN PARylation is a pre-requisite for RNF146-mediated ubiquitination of PTEN (Li et al. 2015).