Boc-Ala-Ala-Phe-pNA is a chromogenic peptide substrate with a p-nitroaniline leaving group for tracking proteolysis. The tripeptide core provides a defined recognition sequence for catalytic mapping. Researchers use it in kinetic assays, cleavage-site evaluation, and structure-activity correlation. Its Boc-protection enhances synthetic stability and controlled deprotection.
CAT No: R2251
CAS No:70968-20-6
Synonyms/Alias:Boc-Ala-Ala-Phe-pNA;70968-20-6;tert-butyl N-[(2S)-1-[[(2S)-1-[[(2S)-1-(4-nitroanilino)-1-oxo-3-phenylpropan-2-yl]amino]-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]carbamate;DTXSID201121964;FB110711;L-Phenylalaninamide, N-[(1,1-dimethylethoxy)carbonyl]-L-alanyl-L-alanyl-N-(4-nitrophenyl)-;tert-butyl (S)-1-((S)-1-((S)-1-(4-nitrophenylamino)-1-oxo-3-phenylpropan-2-ylamino)-1-oxopropan-2-ylamino)-1-oxopropan-2-ylcarbamate;
Boc-Ala-Ala-Phe-pNA, also known as N-tert-Butoxycarbonyl-L-alanyl-L-alanyl-L-phenylalanyl-p-nitroanilide, is a synthetic tripeptide substrate widely utilized in biochemical and enzymological research. Characterized by its N-terminal Boc protecting group and a p-nitroanilide chromogenic moiety at the C-terminus, this compound offers a unique combination of stability and reactivity, making it a valuable tool for the study of proteolytic enzymes. Its modular structure enables selective interaction with specific proteases, while the p-nitroanilide group facilitates straightforward detection and quantification of enzymatic activity through colorimetric assays. Researchers favor this peptide for its versatility in experimental design and its compatibility with various in vitro analytical techniques.
Enzyme Activity Assays: Boc-Ala-Ala-Phe-pNA serves as a prime substrate in chromogenic assays for determining the activity of serine proteases, particularly chymotrypsin-like enzymes. Upon enzymatic cleavage, the p-nitroanilide group is released, producing a distinct yellow color that can be measured spectrophotometrically. This reaction provides a rapid and sensitive means to monitor protease kinetics, evaluate enzyme specificity, and screen for potential protease inhibitors in drug discovery projects. The substrate's design ensures high selectivity, reducing background noise and enhancing the reliability of assay results.
Protease Specificity Studies: The synthetic tripeptide sequence of Boc-Ala-Ala-Phe-pNA allows researchers to probe the substrate preferences and cleavage patterns of various proteases. By systematically modifying the amino acid sequence or protective groups, scientists can elucidate the structural requirements for enzyme recognition and catalysis. This information is invaluable for mapping active sites, understanding enzyme-substrate interactions, and guiding the rational design of more selective inhibitors or diagnostic tools. The chromogenic nature of the pNA group further streamlines data collection and analysis.
High-Throughput Screening: In pharmaceutical and academic research, this peptide substrate is frequently integrated into high-throughput screening platforms to identify novel modulators of protease activity. Its robust colorimetric response enables automated detection and quantification of enzymatic reactions in microplate formats, significantly accelerating the pace of compound library screening. The use of Boc-Ala-Ala-Phe-pNA in such systems supports the discovery of new therapeutic candidates and the assessment of compound potency and selectivity.
Structure-Activity Relationship (SAR) Analysis: Researchers employ this chromogenic peptide to investigate the relationship between substrate structure and protease activity. By comparing the hydrolysis rates of Boc-Ala-Ala-Phe-pNA with those of structurally related analogs, scientists can identify key molecular features that influence enzyme recognition and catalytic efficiency. These insights inform the optimization of substrate design for both basic research and applied applications, such as biosensor development or industrial enzyme engineering.
Educational and Demonstrative Applications: Beyond its research utility, the peptide is commonly used in academic settings to demonstrate fundamental principles of enzyme kinetics and substrate specificity. Its straightforward colorimetric readout provides an engaging and accessible platform for teaching laboratory techniques, data analysis, and experimental design in biochemistry and molecular biology courses. The reliability and reproducibility of Boc-Ala-Ala-Phe-pNA-based assays make it an ideal choice for instructional purposes, fostering a deeper understanding of enzymatic processes among students and trainees.
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