Boc-Ala-Ala-Asp-pNA couples a protected peptide segment with a chromogenic p-nitroanilide group that supports kinetic detection of cleavage events. The arrangement of alanine and aspartic acid offers insight into enzyme-substrate specificity. The Boc protecting group stabilizes the N-terminus during synthetic steps. Use spans protease assays, substrate characterization, and mechanistic analysis.
CAT No: R2434
CAS No:201732-83-4
Synonyms/Alias:Boc-Ala-Ala-Asp-pNA;201732-83-4;(3S)-3-[[(2S)-2-[[(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoyl]amino]propanoyl]amino]-4-(4-nitroanilino)-4-oxobutanoic acid;MFCD00237526;SCHEMBL2523119;HY-P4453;DA-51275;FB110709;CS-0654288;
Boc-Ala-Ala-Asp-pNA is a synthetic peptide substrate widely utilized in biochemical research for its capacity to enable precise enzymatic activity assays. Structurally, it features a blocked N-terminus with a tert-butyloxycarbonyl (Boc) group, a tripeptide sequence composed of alanine-alanine-aspartic acid, and a para-nitroanilide (pNA) chromogenic tag at the C-terminus. This configuration confers both stability and functional specificity, making it particularly valuable for studies involving protease substrate specificity, kinetic profiling, and mechanistic enzyme investigations. The chromogenic pNA group allows for straightforward spectrophotometric detection, facilitating quantitative analysis of peptide bond hydrolysis events.
Enzyme activity assays: The peptide substrate is extensively employed in the development and execution of colorimetric assays to monitor the activity of serine proteases and related enzymes. Upon enzymatic cleavage at the aspartic acid-pNA bond, the release of para-nitroaniline generates a measurable yellow color, which can be quantified spectrophotometrically. This property enables researchers to determine kinetic parameters such as Km and Vmax, evaluate enzyme specificity, and screen for potential inhibitors or activators in a controlled laboratory environment.
Protease specificity studies: The defined sequence of Boc-Ala-Ala-Asp-pNA offers a valuable tool for dissecting substrate recognition patterns of various proteolytic enzymes. By analyzing the rate and efficiency of hydrolysis, investigators can elucidate the sequence preferences of target enzymes, advancing understanding of their physiological roles and contributing to the rational design of selective inhibitors. The presence of the Boc group ensures that cleavage occurs primarily at the intended peptide bond, reducing background activity and enhancing experimental resolution.
High-throughput screening: The chromogenic nature of the pNA leaving group makes this substrate highly amenable to automated and high-throughput screening platforms. Researchers in pharmaceutical and biotechnology settings leverage its rapid, colorimetric readout to evaluate large compound libraries for enzyme modulators, facilitating the identification of lead molecules for further development. The substrate's robust signal and reproducibility support efficient assay miniaturization and scalability for industrial research applications.
Peptide hydrolysis mechanism analysis: The substrate serves as a model system for investigating the catalytic mechanisms underlying peptide bond hydrolysis. Its well-defined structure and predictable cleavage site allow detailed studies of transition states, intermediate formation, and the influence of enzyme mutations on catalytic efficiency. Insights gained from such experiments inform broader understanding of proteolytic processes and support the engineering of enzymes with tailored properties for research or biotechnological use.
Analytical method development: In addition to its primary use in enzyme kinetics, the peptide is valuable for validating and optimizing analytical techniques such as HPLC, capillary electrophoresis, and mass spectrometry. Its predictable cleavage pattern and chromogenic endpoint provide a reliable standard for method calibration, sensitivity assessment, and troubleshooting of peptide analysis workflows. This versatility enhances its utility across a range of biochemical and analytical laboratories seeking to improve assay performance and data quality.
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