[pThr3]-CDK5 Substrate is an effective Phospho-Thr3CDK5 Substrate. [pThr3]-CDK5 Substrate is derived from the sequence of the histone H1 peptide that docks in the active site of CDK5. [pThr3]-CDK5 Substrate is phosphorylated by CDK5 with a Km value of 6 µM.
[pThr3]-CDK5 Substrate is a synthetic peptide designed as a selective substrate for cyclin-dependent kinase 5 (CDK5), an essential serine/threonine kinase involved in neuronal signaling, cell cycle regulation, and neurodegenerative disease mechanisms. As a phosphorylated peptide with threonine at position 3, it serves as a valuable biochemical tool for probing kinase-substrate interactions, facilitating the study of phosphorylation dynamics, and enabling precise quantification of CDK5 activity in vitro. Its sequence and phosphorylation state are optimized to mimic physiological substrates, making it highly relevant for research focused on kinase signaling pathways and post-translational modifications in cellular systems.
Kinase activity assays: The peptide is widely utilized as a model substrate in in vitro kinase assays to measure the enzymatic activity of CDK5 and related kinases. By providing a specific phosphorylation site, it enables researchers to monitor enzyme kinetics, determine substrate specificity, and evaluate the effects of modulators or inhibitors on CDK5-mediated phosphorylation. Use of this substrate supports quantitative assessment of kinase function in both basic research and drug discovery contexts, particularly when screening for novel kinase inhibitors or activators.
Signal transduction studies: In cellular and biochemical investigations, the substrate aids in dissecting the molecular mechanisms underlying CDK5-dependent signaling cascades. Its defined sequence allows for precise mapping of phosphorylation events, thereby facilitating the analysis of downstream signaling pathways regulated by CDK5. This is especially valuable in neurobiology, where aberrant CDK5 activity is implicated in neuronal development, synaptic function, and neurodegenerative disorders such as Alzheimer's disease.
Phosphorylation site mapping: The substrate's design, featuring a phosphorylated threonine residue, is advantageous in studies focused on identifying and characterizing phosphorylation sites within proteins. It serves as a positive control or calibration standard in mass spectrometry-based phosphoproteomics, helping to validate analytical workflows and improve the accuracy of site-specific phosphorylation detection. Researchers leverage this property to refine protocols for mapping kinase-substrate relationships and quantifying phosphorylation stoichiometry in complex samples.
Enzyme inhibitor screening: The peptide is an effective tool for high-throughput screening of small molecule libraries aimed at identifying inhibitors or activators of CDK5. Its use in biochemical assays allows for rapid and reproducible evaluation of compound efficacy, selectivity, and mechanism of action. This application is particularly relevant in pharmaceutical research, where modulation of CDK5 activity represents a potential strategy for targeting pathological signaling in neurological and oncological diseases.
Peptide-based assay development: The substrate supports the development and optimization of peptide-based assays for kinase research and diagnostic applications. Its well-characterized phosphorylation motif enables the design of robust, reproducible assay platforms, including fluorescence, radiometric, and immunodetection formats. By serving as a reference standard or assay component, it contributes to the validation of experimental systems and enhances the reliability of quantitative measurements in kinase biology studies.
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