Xaa-Pro dipeptidase, also known as prolidase, is an enzyme that in humans is encoded by the PEPD gene. Prolidase is an enzyme in humans that plays a crucial role in protein metabolism and collagen recycling through the catalysis of the rate-limiting step in these chemical reactions. This enzyme is coded by the gene PEPD (peptidase D), located on chromosome 19. Serum prolidase activity is also currently being explored as a biomarker for diseases. Xaa-Pro dipeptidase is a cytosolic dipeptidase that hydrolyzes dipeptides with proline or hydroxyproline at the carboxy terminus (but not Pro-Pro). It is important in collagen metabolism because of the high levels of imino acids. Mutations at the PEPD locus cause prolidase deficiency. This is characterised by Iminodipeptidurea, skin ulcers, mental retardation and recurrent infections. Serum prolidase falls into the category of proteases, specifically exopeptidases. These EC numbers range from 3.4.11 to 3.4.19.
Background References
1. Pellegrinelli V et al. Dysregulation of macrophage PEPD in obesity determines adipose tissue fibro-inflammation and insulin resistance. Nat Metab. 2022 Apr
2. Baisya R et al. PEPD-Related Prolidase Deficiency Presenting as Hyper-immunoglobulin E Syndrome. J Clin Immunol. 2022 May
Western blot analysis of PRD on different lysates with Rabbit anti-PRD antibody (HA722411) at 1/1,000 dilution.
Lane 1: SK-Br-3 cell lysate Lane 2: HEK-293 cell lysate Lane 3: HeLa cell lysate Lane 4: SH-SY5Y cell lysate
Lysates/proteins at 15 µg/Lane.
Predicted band size: 55 kDa Observed band size: 55 kDa
Exposure time: 9 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 (HA722411) 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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