Members of this family of proteins are involved in regulating inorganic phosphate transport, as well as telomere length regulation and maintenance [1, 2, 3, 4]. Family members such as SND3 (SRP-independent targeting protein 3, encoded by PHO88, also known as YBR106W) is localized to the endoplasmic reticulum (ER). SND3 works together with SND1 and SND2; these proteins function in parallel with the SRP and GET pathways to target a broad range of substrates to the ER. The SND proteins constitute an alternative targeting route to the ER [5]. SND3/PHO88 was first identified as a Saccharomyces cerevisiae protein involved in inorganic phosphate transport [1]. Functional analysis revealed that Loss of SND3 has been shown to affect secretion of the yeast acid phosphatase [5].

1: A putative membrane protein, Pho88p, involved in inorganic phosphate transport in Saccharomyces cerevisiae. Yompakdee C, Ogawa N, Harashima S, Oshima Y; Mol Gen Genet. 1996;251:580-590. PMID:8709965

2: The proteome of Saccharomyces cerevisiae mitochondria. Sickmann A, Reinders J, Wagner Y, Joppich C, Zahedi R, Meyer HE, Schonfisch B, Perschil I, Chacinska A, Guiard B, Rehling P, Pfanner N, Meisinger C; Proc Natl Acad Sci U S A. 2003;100:13207-13212. PMID:14576278

3: Toward the complete yeast mitochondrial proteome: multidimensional separation techniques for mitochondrial proteomics. Reinders J, Zahedi RP, Pfanner N, Meisinger C, Sickmann A; J Proteome Res. 2006;5:1543-1554. PMID:16823961

4: Telomere length as a quantitative trait: genome-wide survey and genetic mapping of telomere length-control genes in yeast. Gatbonton T, Imbesi M, Nelson M, Akey JM, Ruderfer DM, Kruglyak L, Simon JA, Bedalov A; PLoS Genet. 2006;2:e35. PMID:16552446

5: The SND proteins constitute an alternative targeting route to the endoplasmic reticulum. Aviram N, Ast T, Costa EA, Arakel EC, Chuartzman SG, Jan CH, Hassdenteufel S, Dudek J, Jung M, Schorr S, Zimmermann R, Schwappach B, Weissman JS, Schuldiner M; Nature. 2016;540:134-138. PMID:27905431