Suc-ala-ala-pro-glu-pna is a chromogenic tetrapeptide containing a p-nitroaniline reporter group that monitors enzymatic cleavage. The sequence provides a defined recognition motif for catalytic analysis. Researchers employ it in specificity mapping, kinetic assays, and structural-functional correlation. Its succinylation enhances substrate solubility.
CAT No: R2250
CAS No:108929-37-9
Synonyms/Alias:SUC-ALA-ALA-PRO-GLU-PNA;108929-37-9;Suc-AAPE-pNA;(4S)-4-[[(2S)-1-[(2S)-2-[[(2S)-2-(3-carboxypropanoylamino)propanoyl]amino]propanoyl]pyrrolidine-2-carbonyl]amino]-5-(4-nitroanilino)-5-oxopentanoic acid;MFCD00238356;HY-P4482;DA-58146;FS110775;CS-0654438;(S)-4-((S)-1-((S)-2-((S)-2-(3-carboxypropanamido)propanamido)propanoyl)pyrrolidine-2-carboxamido)-5-(4-nitrophenylamino)-5-oxopentanoic acid;
Suc-ala-ala-pro-glu-pna, also known as succinyl-alanyl-alanyl-prolyl-glutamyl-p-nitroanilide, is a synthetic chromogenic peptide substrate widely utilized in biochemical research. Characterized by its specific amino acid sequence conjugated to a p-nitroanilide (pNA) group, this compound is designed to facilitate sensitive, quantitative detection of protease activity in vitro. The succinyl group at the N-terminus enhances substrate specificity, while the pNA moiety allows for straightforward spectrophotometric analysis upon enzymatic cleavage. Its structure enables researchers to monitor enzyme kinetics in real time, supporting a range of investigative and diagnostic protocols in laboratory settings. The versatility and stability of Suc-ala-ala-pro-glu-pna make it a valuable tool for probing enzymatic mechanisms, screening inhibitors, and characterizing proteolytic pathways across various fields of life sciences.
Enzyme Activity Assays: Suc-ala-ala-pro-glu-pna serves as a reliable substrate for measuring the activity of serine proteases, particularly those with specificity for the pro-glu bond. Upon enzymatic cleavage, the release of p-nitroaniline produces a distinct yellow color, which can be quantitatively measured at 405 nm using a spectrophotometer. This colorimetric change provides a direct and efficient means for researchers to assess enzyme kinetics, determine substrate specificity, and evaluate the effects of potential modulators or inhibitors in high-throughput screening formats. The substrate's defined sequence and chromogenic response streamline assay development and facilitate reproducibility in comparative studies.
Protease Inhibitor Screening: In drug discovery and biochemical research, succinylated peptide substrates like Suc-ala-ala-pro-glu-pna are instrumental for evaluating the efficacy of protease inhibitors. By incorporating this substrate into standardized assay protocols, scientists can monitor the degree of inhibition exerted by candidate molecules, as the reduction in p-nitroaniline release directly correlates with inhibitor potency. This approach enables rapid identification and optimization of lead compounds targeting serine proteases, supporting the advancement of therapeutic research and the elucidation of enzyme-inhibitor interaction mechanisms.
Enzyme Kinetics and Mechanistic Studies: The defined composition of Suc-ala-ala-pro-glu-pna makes it an excellent probe for investigating the kinetic parameters of proteolytic enzymes. Researchers can use it to determine essential values such as Km and Vmax, providing insights into enzyme efficiency and substrate affinity. By varying substrate concentrations and experimental conditions, it is possible to elucidate catalytic mechanisms, characterize enzyme mutants, and compare the functional properties of homologous proteases from different organisms. The chromogenic nature of the substrate ensures that these studies are both sensitive and amenable to real-time data collection.
Quality Control in Bioproduction: In the context of biotechnology and pharmaceutical manufacturing, chromogenic substrates like Suc-ala-ala-pro-glu-pna are frequently utilized for routine quality control of enzyme preparations. By integrating this substrate into batch testing, manufacturers can verify the presence, concentration, and activity of specific proteases used in production processes. This application ensures consistency and reliability in enzyme-based formulations, supporting downstream applications such as protein hydrolysis, peptide synthesis, and bioprocess optimization.
Educational and Training Laboratories: The user-friendly, colorimetric properties of Suc-ala-ala-pro-glu-pna make it an ideal tool for teaching laboratories focused on enzymology and protein chemistry. Students and trainees can visually observe enzyme-catalyzed reactions, practice spectrophotometric techniques, and gain hands-on experience with kinetic analysis using this substrate. Its robust performance and clear readouts enhance the learning experience, fostering a deeper understanding of biochemical principles and experimental methodologies.
Research into proteolytic pathways: Beyond its established applications in enzymology and inhibitor screening, Suc-ala-ala-pro-glu-pna is increasingly leveraged for mapping proteolytic pathways in complex biological samples. By tracking the cleavage of this substrate in tissue extracts, cell lysates, or purified systems, scientists can profile the activity of specific proteases under various physiological or experimental conditions. This approach aids in the identification of novel regulatory mechanisms, supports biomarker discovery, and contributes to the broader understanding of protease function in health and disease. In summary, Suc-ala-ala-pro-glu-pna stands as a versatile and indispensable reagent, empowering researchers to advance knowledge across enzymology, drug development, bioprocessing, and scientific education.
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