This domain is found in Saccharomyces cerevisiae protein SMP2, proteins with an N-terminal lipin domain (Pfam: PF04571) [1]. SMP2 (also known as PAH1) is involved in plasmid maintenance and respiration [2], and has been identified as a Mg2+-dependent phosphatidate phosphatase (EC:3.1.3.4) that contains a haloacid dehalogenase (HAD)-like domain [4]. Lipin proteins are involved in adipose tissue development and insulin resistance [3].

1: A gene, SMP2, involved in plasmid maintenance and respiration in Saccharomyces cerevisiae encodes a highly charged protein. Irie K, Takase M, Araki H, Oshima Y; Mol Gen Genet 1993;236:283-288. PMID:8437575

2: An evolutionarily conserved fission yeast protein, Ned1, implicated in normal nuclear morphology and chromosome stability, interacts with Dis3, Pim1/RCC1 and an essential nucleoporin. Tange Y, Hirata A, Niwa O; J Cell Sci 2002;115:4375-4385. PMID:12376568

3: Insulin-stimulated phosphorylation of lipin mediated by the mammalian target of rapamycin. Huffman TA, Mothe-Satney I, Lawrence JC Jr; Proc Natl Acad Sci U S A 2002;99:1047-1052. PMID:11792863

4: The Saccharomyces cerevisiae Lipin homolog is a Mg2+-dependent phosphatidate phosphatase enzyme. Han GS, Wu WI, Carman GM; J Biol Chem. 2006;281:9210-9218. PMID:16467296