FAM-SAMS incorporates a FAM fluorophore onto a SAMS peptide motif, enabling kinase-activity monitoring through fluorescence. Residue arrangement preserves phosphorylation consensus while the dye enhances detection. Researchers quantify catalytic rates and binding interactions. Applications include kinase assays, high-throughput screening, and fluorescent-substrate optimization.
FAM-SAMS is a synthetic peptide probe comprising the well-characterized SAMS peptide sequence labeled with a carboxyfluorescein (FAM) fluorescent dye at the N-terminus. As a biochemically engineered substrate, it is widely utilized in protein kinase research, particularly in the study of AMP-activated protein kinase (AMPK) activity and regulation. The incorporation of the FAM fluorophore enables sensitive detection and quantification through fluorescence-based assays, making it a valuable reagent for various applications in enzymology, high-throughput screening, and signal transduction studies. Its design reflects both sequence specificity for kinase recognition and compatibility with advanced analytical platforms, positioning it as a versatile tool in molecular and cellular research.
Kinase Activity Assays: FAM-SAMS is extensively employed as a fluorescent substrate in in vitro kinase assays, most notably for quantifying AMPK activity. The peptide's sequence is derived from the SAMS motif, which is selectively phosphorylated by AMPK and related kinases. Upon phosphorylation, the reaction can be monitored in real time or endpoint formats using fluorescence polarization, time-resolved fluorescence, or other optical readouts. This enables precise measurement of kinase activity, facilitating mechanistic studies and the identification of modulators that influence phosphorylation dynamics.
High-Throughput Screening: The fluorescent labeling of the SAMS peptide with FAM allows for its integration into high-throughput screening (HTS) platforms aimed at discovering novel kinase inhibitors or activators. The robust and sensitive fluorescence signal supports miniaturized assay formats, where changes in phosphorylation status can be rapidly detected across large compound libraries. This application is particularly valuable in drug discovery pipelines and for profiling compound selectivity against AMPK or related kinase families.
Enzyme Kinetics and Mechanistic Studies: Researchers utilize FAM-SAMS to elucidate detailed kinetic parameters of AMPK and other kinases that recognize the SAMS motif. The substrate's defined sequence and fluorescent tag enable accurate determination of enzyme turnover rates, substrate affinity (Km), and inhibitor potency (IC50) under various conditions. These kinetic analyses contribute to a deeper understanding of enzyme mechanisms, substrate specificity, and the impact of post-translational modifications on kinase function.
Signal Transduction Research: The peptide serves as a functional probe for dissecting cellular signaling pathways involving AMPK and associated kinases. By monitoring phosphorylation of the FAM-labeled substrate in cell lysates or reconstituted systems, investigators can assess pathway activation, cross-talk with other signaling cascades, and the effects of upstream regulatory events. This approach aids in mapping biochemical networks and elucidating the molecular basis of cellular energy sensing.
Fluorescence-Based Detection Method Development: The unique combination of the SAMS peptide sequence and FAM fluorophore makes this compound an ideal standard or calibration reagent for developing and validating new fluorescence-based detection methods. Researchers employ it to optimize assay conditions, benchmark instrument sensitivity, and establish dynamic ranges for quantitative kinase assays. Its predictable behavior and stable fluorescence properties contribute to reproducible and reliable assay performance in diverse research and analytical settings.
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