[pTyr5] EGFR (988-993) is derived from the autophosphorylation site (Tyr992) of epidermal growth factor receptor (EGFR 988-993). [pTyr5] EGFR (988-993) is often complexed with the catalytically inactive protein-tyrosine phosphate 1B (PTP1B).
[pTyr5] EGFR 988-993 is a synthetic peptide corresponding to amino acid residues 988 to 993 of the human epidermal growth factor receptor (EGFR), incorporating a phosphorylated tyrosine at position 5. As a phosphopeptide, it represents a critical segment of the EGFR cytoplasmic domain, a region pivotal for receptor-mediated signal transduction and protein-protein interactions following tyrosine kinase activation. The inclusion of a site-specific phosphotyrosine enables researchers to investigate the molecular mechanisms underlying EGFR signaling, which is central to diverse cellular processes such as proliferation, differentiation, and migration. Owing to its precise sequence and post-translational modification, [pTyr5] EGFR 988-993 serves as a valuable biochemical tool for dissecting the role of phosphorylation in EGFR function and downstream signaling pathways.
Signal transduction research: In cell signaling studies, this phosphorylated EGFR peptide is frequently used to elucidate the binding specificity of SH2 (Src homology 2) and PTB (phosphotyrosine-binding) domain-containing proteins. By mimicking a physiologically relevant phosphotyrosine motif within EGFR, the peptide facilitates in vitro binding assays, competition experiments, and affinity enrichment protocols, enabling detailed analysis of protein recruitment events that occur upon EGFR activation. Such investigations are critical for mapping the molecular circuitry of receptor tyrosine kinase pathways and for identifying key effectors involved in signal propagation.
Kinase substrate profiling: The defined sequence and phosphorylation state of [pTyr5] EGFR 988-993 make it an ideal substrate or control in kinase activity assays. Researchers employ this peptide to assess the substrate specificity of tyrosine kinases, evaluate kinase inhibitors, or calibrate phospho-specific detection reagents. Its use supports quantitative and qualitative analyses of enzymatic activity, providing insights into the regulatory mechanisms that modulate EGFR phosphorylation dynamics in cellular and biochemical systems.
Antibody validation and assay development: The peptide is a critical reagent for the validation and characterization of phospho-specific antibodies targeting EGFR phosphotyrosine sites. By serving as a positive control in immunoassays, such as ELISA or Western blotting, it allows for the assessment of antibody selectivity and sensitivity toward the phosphorylated epitope. This application is essential for developing robust detection tools for monitoring EGFR activation status in experimental models.
Proteomics and mass spectrometry: In proteomic workflows, [pTyr5] EGFR 988-993 is utilized as a reference standard or spike-in control for optimizing phosphopeptide enrichment, chromatographic separation, and mass spectrometric detection. Its defined sequence and phosphorylation facilitate method development for the identification and quantification of phosphotyrosine-containing peptides in complex biological samples. These studies support the broader effort to map phosphorylation networks and understand post-translational modifications in cellular signaling.
Peptide-protein interaction studies: The site-specific phosphorylation within this EGFR segment enables precise investigation of molecular interactions between EGFR-derived motifs and downstream signaling proteins. Researchers use the peptide in surface plasmon resonance, isothermal titration calorimetry, or pull-down assays to characterize binding affinities, kinetics, and specificity of interaction partners. Such experiments are instrumental in delineating the structural and functional consequences of tyrosine phosphorylation within the EGFR signaling axis, thereby advancing the understanding of receptor-mediated cellular responses.
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