Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Prosaposin also known as PSAP is a protein which in humans is encoded by the PSAP gene. This gene encodes a highly conserved glycoprotein which is a precursor for 4 cleavage products: saposins A, B, C, and D. Saposin is an acronym for Sphingolipid Activator PrO[S]teINs. Each domain of the precursor protein is approximately 80 amino acid residues long with nearly identical placement of cysteine residues and glycosylation sites. Saposins A-D localize primarily to the lysosomal compartment where they facilitate the catabolism of glycosphingolipids with short oligosaccharide groups. The precursor protein exists both as a secretory protein and as an integral membrane protein and has neurotrophic activities. Saposins A-D are required for the hydrolysis of certain sphingolipids by specific lysosomal hydrolases.

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