H-D-Phe-Pip-Arg-pNA.2HCl

H-D-Phe-Pip-Arg-pNA.2HCl is a synthetic peptide substrate widely utilized in biochemical research for its highly specific sequence and chromogenic reporting group. Structurally, it incorporates D-phenylalanine, pipecolic acid, and arginine residues, terminating with a para-nitroanilide (pNA) moiety that enables sensitive spectrophotometric detection. The inclusion of D-amino acids and non-standard residues imparts unique properties, making this compound especially valuable for enzymology studies and protease profiling. Its design is tailored for research applications that demand precise substrate specificity and straightforward analytical readouts, supporting investigations into proteolytic activity, enzyme kinetics, and substrate recognition.

Enzyme activity assays: The peptide substrate is extensively employed in the quantitative measurement of serine proteases, particularly those with trypsin-like specificity. Upon enzymatic cleavage at the arginine residue, the para-nitroaniline group is released, resulting in a measurable colorimetric change. This feature enables researchers to monitor enzyme kinetics in real time, facilitating detailed characterization of catalytic efficiency, substrate preference, and inhibitor potency under various experimental conditions.

Protease inhibitor screening: In the context of drug discovery and biochemical screening, this substrate serves as a robust tool for evaluating the efficacy of candidate protease inhibitors. By providing a direct and sensitive readout of proteolytic activity, it allows for the rapid assessment of inhibitor binding and mechanism of action. The substrate's defined sequence ensures selectivity for target enzymes, reducing background interference and improving the reliability of inhibitor profiling in high-throughput or mechanistic studies.

Substrate specificity profiling: Researchers use this chromogenic peptide to investigate the substrate recognition patterns of diverse proteases. The incorporation of D-phenylalanine and pipecolic acid expands the substrate's utility beyond conventional sequences, offering insights into enzyme selectivity and structural requirements for catalysis. Such studies are critical for elucidating the molecular determinants of protease-substrate interactions and for engineering enzymes with tailored specificities.

Analytical method development: The well-characterized cleavage and chromogenic response of this peptide make it ideal for the development and validation of spectrophotometric assays. Analytical laboratories leverage its consistent performance to establish standard protocols for enzyme quantification, activity monitoring, and quality control. Its use supports the creation of reproducible and sensitive assays that are essential in both academic research and industrial settings.

Biochemical pathway elucidation: The substrate's defined structure and responsive chromophore enable its application in dissecting proteolytic pathways within complex biological samples. By tracking the generation of para-nitroaniline in cell lysates, tissue extracts, or recombinant systems, scientists can map protease activity profiles, identify functional enzymes, and investigate regulatory mechanisms. These insights contribute to a deeper understanding of proteolytic regulation in physiological and experimental contexts.

1. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

2. Urinary Metabolites Associated with Blood Pressure on a Low-or High-Sodium Die

3. High fat diet and GLP-1 drugs induce pancreatic injury in mice

4. An Isolated TCR αβ Restricted by HLA-A* 02: 01/CT37 Peptide Redirecting CD8+ T Cells to Kill and Secrete IFN-γ in Response to Lung Adenocarcinoma Cell Lines

5. Identification, Localization in the Central Nervous System and Novel Myostimulatory Effect of Allatostatins in Tenebrio molitor Beetle