Receptor-type tyrosine-protein kinase FLT3 (591-600)

Receptor-type tyrosine-protein kinase FLT3 (591-600) is a synthetic peptide fragment corresponding to amino acids 591 through 600 within the intracellular domain of the FLT3 protein, a member of the class III receptor tyrosine kinase family. This region is functionally significant in signal transduction pathways that regulate hematopoietic cell proliferation, differentiation, and survival. The FLT3 receptor is widely studied for its role in the regulation of early hematopoiesis and its implication in various malignancies, particularly acute myeloid leukemia (AML). As a chemically defined peptide, the 591-600 sequence provides researchers with a precise tool for dissecting the molecular interactions, phosphorylation events, and downstream signaling processes associated with FLT3 function.

Phosphorylation studies: The FLT3 (591-600) peptide is frequently utilized as a model substrate in kinase assays to investigate site-specific phosphorylation events catalyzed by FLT3 and related kinases. Its defined sequence allows for the assessment of kinase activity, substrate specificity, and the identification of regulatory residues involved in autophosphorylation or trans-phosphorylation. By enabling quantitative and qualitative analyses of phosphorylation, the peptide supports mechanistic studies of FLT3-mediated signaling cascades and the evaluation of kinase inhibitors in a controlled biochemical context.

Antibody development: Synthetic peptides derived from critical intracellular domains of receptor tyrosine kinases, such as FLT3 (591-600), are valuable immunogens for generating phospho-specific or sequence-specific antibodies. These antibodies are essential tools for detecting the activation state of FLT3 in cell lysates or tissue samples via immunoassays, including Western blotting and ELISA. The use of this peptide in antibody production facilitates the development of highly selective reagents that distinguish between phosphorylated and non-phosphorylated forms, thereby advancing studies of FLT3 signaling dynamics in both normal and disease states.

Protein-protein interaction mapping: The 591-600 region of FLT3 encompasses residues that may participate in critical protein-protein interactions within the receptor's intracellular signaling network. Employing the synthetic peptide in binding assays, such as pull-down experiments or surface plasmon resonance, enables researchers to identify and characterize adaptor proteins, phosphatases, or other regulatory molecules that associate with this specific segment. These studies contribute to a deeper understanding of FLT3 signalosome assembly and the modulation of downstream pathways.

Epitope mapping and structural studies: The defined sequence of FLT3 (591-600) serves as an effective probe for epitope mapping, allowing researchers to delineate antibody binding sites or T-cell epitopes relevant to immune recognition. In addition, the peptide can be used in structural analyses, such as NMR or crystallography, to elucidate conformational features or interaction motifs within the FLT3 intracellular domain. These applications provide valuable insights into the structural determinants underlying receptor activation, regulation, and molecular recognition.

Enzyme inhibitor screening: The FLT3 (591-600) peptide is also employed in high-throughput screening platforms designed to identify and characterize small-molecule inhibitors targeting FLT3 kinase activity. By serving as a defined substrate in enzymatic assays, the peptide enables the evaluation of compound potency, selectivity, and mechanism of action. This application is particularly relevant for drug discovery efforts focused on modulating aberrant FLT3 signaling in hematologic malignancies and related research areas.

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