Receptor tyrosine-protein kinase erbB-2 (665-673)

Receptor tyrosine-protein kinase erbB-2 (665-673) is a synthetic peptide corresponding to amino acid residues 665 through 673 of the human HER2/neu (erbB-2) protein. As a segment derived from the intracellular domain of the erbB-2 receptor tyrosine kinase, this peptide is of particular interest in molecular and cellular biology research focused on signal transduction, protein-protein interactions, and post-translational modification analyses. The sequence represents a region implicated in regulatory phosphorylation events and downstream effector recruitment, making it a valuable reagent for dissecting the biochemical mechanisms underlying HER2-mediated signaling pathways.

Peptide mapping and epitope characterization: Researchers utilize this peptide as a defined epitope for mapping antibody binding sites and characterizing the specificity of monoclonal and polyclonal antibodies directed against HER2/neu. By providing a precise peptide sequence from the cytoplasmic tail of the receptor, it enables detailed studies of antibody recognition, which is essential for developing and validating immunodetection reagents and for investigating the molecular determinants of immune recognition in experimental systems.

Kinase substrate assays: The 665-673 peptide serves as a model substrate in in vitro kinase assays designed to probe the enzymatic activity of kinases that target the erbB-2 cytoplasmic domain. Its defined sequence allows for the examination of phosphorylation kinetics, substrate specificity, and the identification of phosphorylation sites, thereby facilitating the study of intracellular signaling cascades and the regulatory mechanisms controlling receptor activation and downstream signaling events.

Protein-protein interaction studies: The synthetic peptide is employed in binding assays to elucidate interactions between the erbB-2 intracellular region and cytoplasmic adaptor proteins, phosphatases, or other signaling molecules. By using the peptide in pull-down assays, surface plasmon resonance, or other biophysical techniques, scientists can quantitatively and qualitatively assess how specific motifs within the receptor mediate recruitment of downstream effectors, contributing to a deeper understanding of signal propagation and network dynamics.

Phosphorylation site analysis: The defined sequence of erbB-2 (665-673) is frequently used as a standard or reference in mass spectrometry-based phosphoproteomics workflows. Its utility includes serving as a positive control for method development, calibration, and validation of analytical protocols aimed at detecting and quantifying phosphorylation on tyrosine or serine/threonine residues. This supports high-confidence identification of post-translational modifications in complex biological samples.

Peptide-based inhibitor screening: The erbB-2 (665-673) peptide provides a template for the rational design and screening of small molecules or peptidomimetics that can modulate interactions or enzymatic modifications at this region of the receptor. By mimicking a critical segment of the receptor's intracellular domain, the peptide facilitates assays to identify candidate inhibitors of protein-protein interactions or kinase activity, supporting early-stage drug discovery and mechanistic studies in cellular signaling research.

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