This domain is involved in binding sterols. It is found in the SCP2 protein Swiss:P22307, as well as the C terminus of Swiss:P51659 the enzyme estradiol 17 beta-dehydrogenase EC:1.1.1.62. The UNC-24 protein Swiss:Q17372 contains an SPFH domain Pfam:PF01145 [2].

1: NMR determination of the secondary structure and the three-dimensional polypeptide backbone fold of the human sterol carrier protein 2. Szyperski T, Scheek S, Johansson J, Assmann G, Seedorf U, Wuthrich K; FEBS Lett 1993;335:18-26. PMID:8243660

2: The Caenorhabditis elegans behavioral gene unc-24 encodes a novel bipartite protein similar to both erythrocyte band 7.2 (stomatin) and nonspecific lipid transfer protein. Barnes TM, Jin Y, Horvitz HR, Ruvkun G, Hekimi S; J Neurochem 1996;67:46-57. PMID:8667025