This is a middle domain of lipins. Overall the enzyme acts as a magnesium-dependent phosphatidate phosphatase enzyme that catalyses the conversion of phosphatidic acid to diacylglycerol during triglyceride, phosphatidylcholine and phosphatidylethanolamine biosynthesis. EC:5.2.1.8.

1: Three mammalian lipins act as phosphatidate phosphatases with distinct tissue expression patterns. Donkor J, Sariahmetoglu M, Dewald J, Brindley DN, Reue K; J Biol Chem. 2007;282:3450-3457. PMID:17158099

2: Nuclear envelope phosphatase 1-regulatory subunit 1 (formerly TMEM188) is the metazoan Spo7p ortholog and functions in the lipin activation pathway. Han S, Bahmanyar S, Zhang P, Grishin N, Oegema K, Crooke R, Graham M, Reue K, Dixon JE, Goodman JM; J Biol Chem. 2012;287:3123-3137. PMID:22134922