Putative regulatory subunit of protein phosphatase 6 (PP6) that may be involved in the recognition of phosphoprotein substrates. Involved in the PP6-mediated dephosphorylation of NFKBIE opposing its degradation in response to TNF-alpha. Selectively inhibits the phosphatase activity of PPP1C. Targets PPP1C to modulate HNRPK phosphorylation. ANKRD28 selectively regulated phosphorylation of hnRNP-K at ser284, an effect that was enhanced in vivo by an S1013A/S1017A double mutant, suggesting that ANKRD28 targets PP1 in a regulated manner to dephosphorylate hnRNP-K selectively at ser284.
