Ac-ANW-AMC is a fluorogenic peptide substrate and used for measuring chymotrypsin-like activity of the immunoproteasome.This substrate is specific to the immunoproteasome, and is not hydrolyzed efficiently by the constitutive proteasome. Cleavage of this peptide by the immunoproteasome or other enzymes liberates the fluorophore AMC causing a strong fluorescent signal which is detected at an Excitation wavelength of 345nm and Emission wavelength of 445nm.
Ac-Ala-Asn-Trp-AMC (Ac-ANW-AMC) is a synthetic peptide substrate featuring an N-terminal acetyl group, a tripeptide core of alanine, asparagine, and tryptophan, and a C-terminal 7-amino-4-methylcoumarin (AMC) fluorophore. Its design leverages the biochemical specificity of short peptide sequences conjugated to a fluorescent leaving group, making it a valuable tool in enzymology and protease research. By incorporating the AMC moiety, Ac-ANW-AMC enables sensitive detection of enzymatic cleavage events, facilitating quantitative analysis in a variety of biochemical and cell-based assays. The compound's modular structure and fluorogenic properties position it as a reliable substrate for advancing studies in enzyme kinetics, substrate specificity, and high-throughput screening.
Enzyme Activity Assays: As a fluorogenic peptide substrate, Ac-ANW-AMC is widely utilized for measuring the activity of proteases and peptidases that recognize and cleave its specific peptide sequence. Upon enzymatic hydrolysis, the AMC group is released, resulting in a pronounced increase in fluorescence that can be quantitatively monitored. This feature enables researchers to conduct real-time kinetic analyses of enzyme activity, determine catalytic parameters, and compare the efficiency of different proteolytic enzymes under controlled experimental conditions.
Substrate Specificity Profiling: The tripeptide sequence of Ac-ANW-AMC allows it to serve as a probe for mapping the substrate preferences of proteolytic enzymes. By incorporating defined amino acids at each position, the substrate supports systematic investigation into the sequence selectivity of target enzymes. Such studies are instrumental in characterizing enzyme-substrate interactions, elucidating cleavage site preferences, and guiding the rational design of inhibitors or alternative substrates for biochemical research.
High-Throughput Screening Applications: The robust fluorescent signal generated by AMC release makes this substrate highly suitable for high-throughput screening (HTS) platforms. In drug discovery and enzyme inhibitor development, Ac-ANW-AMC can be incorporated into automated assay formats to rapidly evaluate large compound libraries for modulators of protease activity. Its compatibility with microplate readers and standardized assay protocols streamlines workflow and enhances the reliability of screening campaigns.
Mechanistic Enzymology Studies: Researchers employ Ac-ANW-AMC in detailed mechanistic studies to dissect the catalytic pathways and intermediate steps involved in peptide bond hydrolysis. The ability to monitor substrate turnover in real time provides insight into transient enzyme-substrate complexes, reaction intermediates, and the influence of cofactors or allosteric modulators. Such mechanistic data are critical for advancing fundamental understanding of proteolytic processes and for informing the engineering of enzymes with tailored properties.
Cell-Free and Cell-Based Assays: The fluorogenic nature of Ac-ANW-AMC supports its use in both purified enzyme systems and more complex biological extracts. In cell-free assays, it provides a controlled environment for precise quantification of protease activity, while in cell-based models, it can reveal proteolytic dynamics within physiological or pathological contexts. The versatility of this substrate thus extends to diverse research areas, including signal transduction, protein turnover, and post-translational modification studies, where sensitive detection of enzyme activity is required.
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