Regulatory subunit of protein phosphatase 6 (PP6). May function as a scaffolding PP6 subunit. Involved in the PP6-mediated dephosphorylation of NFKBIE opposing its degradation in response to TNF-alpha. Protein phosphatase 6 (PP6) holoenzyme is proposed to be a heterotrimeric complex formed of the catalytic subunit, a SAPS domain-containing subunit (PP6R) and an ankyrin repeat-domain containing regulatory subunit (ARS). Interacts with PPP6C and NFKBIE. Interacts with ANKRD28, ANKRD44 and ANKRD52. Ubiquitous with higher expression in testis. Belongs to the SAPS family. Extended N-terminus.