Anti-PSAP Rabbit Monoclonal Antibody (KD Validated) for WB, IHC-P, ELISA - P07602

Core Product Specifications and Parameters

Biological Background: PSAP Function and Localization

• Prosaposin (PSAP) is a precursor protein that is proteolytically cleaved to yield four homologous saposin peptides (saposin A, B, C, and D), each functioning as non-enzymatic activator proteins for specific lysosomal sphingolipid-degrading enzymes.
• Saposins facilitate the hydrolysis of sphingolipids by extracting lipid substrates from membranes and presenting them to their respective enzymes, with distinct but partially overlapping lipid and enzyme specificities among family members.
• PSAP also behaves as a myelinotrophic and neurotrophic factor, mediating its effects through G protein-coupled receptors GPR37 and GPR37L1, leading to receptor internalization and ERK phosphorylation signaling.
• As an essential lysosomal cofactor, PSAP/saposins activate various enzymes: galactocerebrosidase (GALC) for galactosylceramide, arylsulfatase A for sulfatides, beta-galactosidase for GM1 gangliosides, alpha-galactosidase A for globotriaosylceramide, and acid beta-glucosylceramidase (glucocerebrosidase) for glucosylceramide.
• Saposin D primarily stimulates acid ceramidase and acid sphingomyelinase, with ceramide catabolism being its main physiological role.
• Subcellularly, prosaposin is localized in lysosomes and is also secreted; it is involved in glycosphingolipid metabolism and has been implicated in neurodegenerative disorders such as Gaucher disease, Parkinson disease, and metachromatic leukodystrophy.
• The protein undergoes alternative splicing and contains disulfide bonds; its molecular weight is approximately 58 kDa.

Experimental Guidance and Technical Tips

• This monoclonal antibody was generated using a recombinant fragment corresponding to amino acids 275–524, which encompasses the saposin B, C, D domains; therefore, it may detect both full-length prosaposin and its processed saposin forms in relevant sample types.
• For Western blotting, the predicted molecular weight of full-length prosaposin is 58 kDa; additional bands corresponding to individual saposins (~10–15 kDa) may be observed depending on lysosomal processing. Consider optimizing sample preparation and loading conditions.
• For immunohistochemistry, validate in tissues known to express high levels of PSAP, such as brain, kidney, and spleen, and consider lysosomal enrichment markers for colocalization.
• For ELISA, pair with a carefully selected capture antibody or antigen standard, and validate in the relevant sample system to ensure specificity and sensitivity.

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