Ac-Lys-pNA is an N-acetylated lysine derivative bearing a p-nitroanilide (pNA) reporter, classed as an amino acid amide substrate with a lysine side chain that terminates in an amine functionality. The molecule contains an acetyl-protected α-amino group, a free carboxamide at the pNA terminus, and the ε-amino side chain of lysine, enabling it to act as a chromogenic leaving-group conjugate in assays that monitor amide-bond cleavage by release of p-nitroaniline. In biochemical and analytical workflows, Ac-Lys-pNA is employed as a substrate analog for enzyme activity measurements and method development where the appearance of the pNA chromophore provides a readout tied to lysine-directed specificity and peptide-bond-like scission at the acyl-amide linkage.
Ac-Lys-pNA is an N-acetylated lysine derivative bearing a para-nitroanilide (pNA) reporter on the lysine side chain, providing a chromogenic substrate format commonly used to monitor proteolytic activity. The pNA group releases a measurable yellow chromophore upon enzymatic cleavage, making this reagent valuable for kinetics work that links substrate turnover to absorbance readouts. Its defined lysine-based structure supports straightforward assay design in enzymology and screening workflows where lysine-selective cleavage or lysine-dependent protease behavior is evaluated.
1. Protease Activity Assays
Ac-Lys-pNA is widely used as a chromogenic substrate in enzymology to quantify protease activity by tracking the liberation of p-nitroaniline (pNA) via UV-Vis absorbance. Researchers in biochemistry and assay development use it for time-course and dose-response measurements, including comparative studies of enzyme variants, buffer conditions, and inhibitor effects in plate-based formats. The N-acetylated lysine context and the side-chain-linked pNA reporter help standardize substrate structure across experiments, supporting reproducible kinetic analysis for lysine-associated proteolysis.
2. Enzyme Kinetics Screening
Ac-Lys-pNA supports high-throughput screening and kinetic characterization where rapid signal generation is required to rank relative catalytic performance. Protein engineering groups and enzymology labs employ this substrate to generate initial rate data, evaluate substrate concentration dependence, and compare cleavage efficiencies across related proteases or engineered mutants. Because the readout is directly tied to cleavage of the pNA reporter, it fits workflows that prioritize consistent assay signal over more complex detection schemes.
3. Protease Inhibitor Profiling
Ac-Lys-pNA is used to assess how small molecules, peptide-like inhibitors, or chemical modulators affect protease-mediated cleavage through changes in chromophore formation. Medicinal chemistry and chemical biology teams incorporate this substrate into inhibitor profiling experiments to obtain relative potency and to support structure-activity relationship studies using a lysine-linked cleavage motif. The defined reporter chemistry enables straightforward interpretation of inhibition trends from absorbance-based kinetics, facilitating iterative optimization of candidate inhibitors in early discovery settings.
4. Analytical Method Development
Ac-Lys-pNA is also used as a practical reagent for developing and validating chromogenic protease assay conditions, including selecting measurement wavelengths, optimizing reaction timing, and establishing calibration behavior for pNA-based detection. Analytical chemistry and protein science laboratories use it to standardize assay performance across instruments and to troubleshoot variability arising from enzyme handling, buffer composition, or substrate preparation. This makes the reagent useful not only for routine activity checks, but also for establishing robust protocols for downstream screening campaigns.
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