Kemptide (Phospho-Ser5) is a phosphate acceptor peptide that serves as a specific substrate for cAMP-dependent protein kinase (PKA).
CAT No: R1467
Kemptide Phospho-Ser5 is a synthetic peptide derivative characterized by the phosphorylation of its serine residue at the fifth position. As a modified form of the well-known Kemptide sequence, it serves as a highly specific substrate for investigating phosphorylation-dependent processes. The addition of a phosphate group at the serine-5 position imparts unique biochemical properties, making it a valuable molecular tool for dissecting protein kinase activity, substrate specificity, and signaling pathway modulation. Its defined structure and modification status allow researchers to precisely interrogate the functional consequences of serine phosphorylation, which is central to numerous cellular regulation mechanisms.
Kinase substrate assays: As a phospho-serine-containing peptide, Kemptide Phospho-Ser5 is widely employed as a reference or control substrate in kinase activity assays. Its defined phosphorylation state enables the assessment of kinase specificity and efficiency, particularly for kinases that recognize or are regulated by phosphorylated serine motifs. By comparing the enzymatic processing of the phosphorylated versus non-phosphorylated forms, researchers can elucidate substrate preferences, catalytic mechanisms, and the impact of phosphorylation on enzyme recognition.
Signal transduction research: The peptide is instrumental in studies of signal transduction pathways, especially those involving serine/threonine kinases. Its phosphorylated serine residue serves as a mimic of post-translationally modified protein segments, allowing the dissection of downstream signaling events. Researchers utilize this peptide to probe the role of serine phosphorylation in cellular communication, regulatory feedback loops, and the dynamic modulation of protein-protein interactions within signaling cascades.
Phosphatase characterization: The presence of a phospho-serine residue makes this peptide a suitable substrate for serine/threonine phosphatase assays. By monitoring the dephosphorylation of Kemptide Phospho-Ser5, investigators can quantify phosphatase activity, determine enzyme kinetics, and study substrate selectivity. This application is particularly relevant for elucidating the regulatory mechanisms that control phosphorylation cycles and for screening potential phosphatase modulators in biochemical research.
Antibody validation: In immunological studies, Kemptide Phospho-Ser5 provides a robust tool for validating the specificity of phospho-serine antibodies. By serving as a defined epitope, it allows researchers to confirm antibody recognition of phosphorylated serine motifs, distinguish between phosphorylated and non-phosphorylated states, and optimize immunodetection protocols. This application is critical for ensuring the reliability of phospho-specific antibody reagents in western blotting, immunoprecipitation, and related assays.
Peptide-protein interaction analysis: The phosphorylated peptide is also valuable for investigating interactions between phospho-serine-containing motifs and phospho-binding domains such as 14-3-3 proteins or WW domains. By incorporating Kemptide Phospho-Ser5 into binding studies, researchers can map interaction sites, quantify binding affinities, and explore the structural basis for phospho-dependent recognition. These insights contribute to a deeper understanding of how serine phosphorylation orchestrates complex protein interaction networks within the cell.
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