D-Lys(Z)-Pro-Arg-pNA is a luminescent substrate of activated protein C (APC).
D-Lys(Z)-Pro-Arg-pNA is a synthetic peptide substrate widely utilized in biochemical and enzymological research. Structurally, it features a protected lysine residue (D-Lys(Z)), a proline, and an arginine, with a para-nitroanilide (pNA) group at the C-terminus. This configuration is specifically designed to facilitate chromogenic detection of proteolytic activity, making the compound a valuable tool in the study of serine proteases and related enzymatic processes. The incorporation of D-amino acid and protective groups enhances its stability and selectivity, allowing for precise interrogation of enzyme specificity and catalytic mechanisms in complex biological systems.
Enzyme activity assays: A primary application of D-Lys(Z)-Pro-Arg-pNA is in quantitative measurement of protease activity, especially for enzymes such as trypsin-like serine proteases. Upon enzymatic cleavage at the arginine-pNA bond, the substrate releases the chromophore p-nitroaniline, which can be monitored spectrophotometrically. This enables researchers to determine kinetic parameters, assess substrate specificity, and evaluate enzyme inhibitors under controlled laboratory conditions. The chromogenic nature of the substrate provides a rapid, sensitive, and reproducible means of monitoring proteolytic reactions in real time.
Protease inhibitor screening: The peptide substrate is highly effective in high-throughput screening assays for the identification and characterization of protease inhibitors. By providing a reliable readout of enzymatic cleavage, it supports the evaluation of small molecules, peptides, or biological extracts for their capacity to modulate protease activity. This is particularly valuable in early-stage drug discovery and in the development of biochemical tools for dissecting proteolytic pathways, where robust and reproducible assays are essential for identifying active compounds.
Substrate specificity studies: D-Lys(Z)-Pro-Arg-pNA is frequently employed to probe the substrate preferences and cleavage site selectivity of proteolytic enzymes. Its defined sequence, including the D-amino acid and protective group, enables detailed investigation of how structural modifications influence enzyme-substrate interactions. Researchers use this information to elucidate enzyme mechanisms, map active site architecture, and inform the rational design of novel substrates or inhibitors with improved selectivity or potency.
Biochemical pathway elucidation: The substrate serves as a functional probe for mapping protease-mediated processes in cell extracts, tissue homogenates, or purified systems. By tracking the enzymatic cleavage of the peptide, scientists can dissect the roles of specific proteases within broader biological pathways, identify unknown proteolytic activities, and characterize the regulation of protease cascades. This application contributes to a deeper understanding of physiological and pathological processes involving proteolytic enzymes.
Analytical method development: D-Lys(Z)-Pro-Arg-pNA is also utilized in the validation and optimization of analytical protocols for enzyme quantification. Its well-characterized cleavage and chromogenic response make it an ideal standard for calibrating spectrophotometric assays, benchmarking assay performance, and ensuring reproducibility across experimental runs. The substrate's versatility supports its integration into diverse analytical workflows, from academic research laboratories to industrial quality control settings, where precise and reliable measurement of protease activity is required.
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