Acts as a scaffolding protein for phosphatase let-92 and its regulatory subunits (Probable). Probably together with let-92 and regulatory subunit sur-6, regulates centriole duplication, microtubule outgrowth and mitotic spindle stability during early embryonic cell division by preventing the degradation of sas-5 and kinase zyg-1 (PubMed:23336080, PubMed:17218259). During vulva development, may play a role with phosphatase let-92 and regulatory subunit sur-6 in the induction of vulva cell precursors by positively regulating let-60/Ras-MAP kinase signaling, probably by promoting lin-45 activation (PubMed:10521400). Plays a positive role in axon guidance probably by inhibiting phosphatase let-92 (PubMed:20392746). Part of a complex consisting of a common heterodimeric core enzyme, composed of catalytic subunit let-92 and constant regulatory subunit paa-1, that associates with a variety of regulatory subunits which confer distinct properties to the holoenzyme (PubMed:17218259, PubMed:21497766). Interacts with rsa-1 (PubMed:17218259). Localizes to P granules in embryonic cells. Each HEAT repeat appears to consist of two alpha helices joined by a hydrophilic region, the intrarepeat loop. The repeat units may be arranged laterally to form a rod-like structure. RNAi-mediated knockdown causes severe embryonic lethality (PubMed:10521400, PubMed:23336080). Causes a failure to duplicate centrioles resulting in the formation of monopolar spindles at the 2-cell embryonic stage (PubMed:21497766, PubMed:23336080). sas-5 protein levels are reduced in embryos (PubMed:21497766). The few surviving animals lack a vulva resulting from defects in vulva cell induction, vulva precursor cell (VPC) generation and in vulval execution linage (PubMed:10521400). Partially suppresses multivulva formation in a let-60 n1046 mutant background (PubMed:10521400). Belongs to the phosphatase 2A regulatory subunit A family.