This family consists of several ceramidases. Ceramidases are enzymes involved in regulating cellular levels of ceramides, sphingoid bases, and their phosphates, EC:3.5.1.23. This family belongs to the CREST superfamily [2], which are distantly related to the GPCRs.

1: Cloning and characterization of a novel human alkaline ceramidase. A mammalian enzyme that hydrolyzes phytoceramide. Mao C, Xu R, Szulc ZM, Bielawska A, Galadari SH, Obeid LM; J Biol Chem 2001;276:26577-26588. PMID:11356846

2: CREST--a large and diverse superfamily of putative transmembrane hydrolases. Pei J, Millay DP, Olson EN, Grishin NV; Biol Direct. 2011;6:37. PMID:21733186