Prosaposin, also known as PSAP, is a protein which in humans is encoded by the PSAP gene. This highly conserved glycoprotein 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.
Background References
1. Lin ZH et al. PSAP intronic variants around saposin D domain and Parkinson\'s disease. Brain. 2021 Feb
2. Zhao YW et al. PSAP variants in Parkinson\'s disease: a large cohort study in Chinese mainland population. Brain. 2021 Apr
Western blot analysis of PSAP on different lysates with Rabbit anti-PSAP antibody (HA722322) at 1/1,000 dilution.
Lane 1: HepG2 cell lysate Lane 2: U-2 OS cell lysate Lane 3: U-87 MG cell lysate Lane 4: A549 cell lysate Lane 5: SK-Br-3 cell lysate Lane 6: LNCaP cell lysate Lane 7: MCF7 cell lysate
Lysates/proteins at 20 µg/Lane.
Predicted band size: 58 kDa Observed band size: 80 kDa
Exposure time: 14 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA722322) at 1/1,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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