This entry represents a saposin-like domain found at the N-terminus of some SGNH hydrolase enzymes such as Acyloxyacyl hydrolase [1]. In this enzyme the substrate's lipid moiety is accommodated in a large hydrophobic pocket formed by the saposin and catalytic domains with a secondary acyl chain inserted into a narrow lateral hydrophobic tunnel at the active site [1].

1: Crystal structure of the mammalian lipopolysaccharide detoxifier. Gorelik A, Illes K, Nagar B; Proc Natl Acad Sci U S A. 2018;115:E896. PMID:29343645