Receptor-type tyrosine-protein phosphatase kappa (667-682)

Receptor-type tyrosine-protein phosphatase kappa (667-682) is a synthetic peptide fragment derived from a specific region of the receptor-type tyrosine-protein phosphatase kappa (PTPRK) protein. As a member of the protein tyrosine phosphatase family, PTPRK plays a crucial role in cellular signaling by modulating phosphorylation states of target proteins, thereby influencing processes such as cell adhesion, growth, and differentiation. The (667-682) sequence represents a defined segment within the protein, offering a valuable tool for dissecting structure-function relationships, mapping epitope regions, and supporting targeted biochemical investigations. Its precise sequence and well-characterized origin make it particularly relevant for researchers studying signal transduction pathways, protein-protein interactions, and the regulatory mechanisms of phosphatase activity in various biological systems.

Peptide mapping: In proteomics and structural biology, the (667-682) peptide fragment serves as a reference standard for peptide mapping experiments. By using this defined sequence, researchers can accurately identify and confirm the presence of PTPRK-derived peptides in complex biological samples via mass spectrometry or chromatographic techniques. This approach facilitates the characterization of post-translational modifications, the assessment of proteolytic processing sites, and the validation of protein expression profiles, thereby enhancing the reliability of protein identification workflows.

Antibody development: The synthetic peptide corresponding to residues 667-682 of PTPRK is frequently employed as an immunogen or antigen in antibody production protocols. Its unique sequence enables the generation of highly specific polyclonal or monoclonal antibodies targeting the native protein or its processed forms. These antibodies are invaluable for applications such as Western blotting, immunoprecipitation, and immunohistochemistry, where precise detection and localization of PTPRK are required to elucidate its function in cell signaling and tissue organization.

Protein interaction studies: As a defined epitope, the (667-682) peptide is instrumental in probing protein-protein interactions involving PTPRK. Researchers can utilize this fragment in binding assays, pull-down experiments, or surface plasmon resonance analyses to investigate the molecular partners and interaction domains of PTPRK. Such studies provide insights into the regulatory networks that modulate tyrosine phosphorylation and contribute to the understanding of cell-cell communication, adhesion dynamics, and signaling cascades in normal and pathological contexts.

Enzyme substrate assays: The peptide fragment is also used as a substrate or competitive inhibitor in in vitro phosphatase activity assays. By incorporating this sequence into enzymatic assays, scientists can assess the substrate specificity, catalytic efficiency, and regulatory properties of PTPRK or related phosphatases. These studies are essential for elucidating the biochemical mechanisms underlying dephosphorylation events and for screening small-molecule modulators that may influence phosphatase activity in research settings.

Epitope mapping and structural analysis: The (667-682) region provides a defined target for epitope mapping experiments aimed at delineating antibody binding sites or identifying critical residues involved in molecular recognition. By synthesizing and analyzing this peptide, structural biologists and immunologists can dissect the conformational and linear determinants of antigenicity, facilitating the rational design of peptide-based probes, vaccines, or diagnostic reagents. Such applications are key to advancing the understanding of protein structure-function relationships and the development of novel research tools.

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