Cyclin-A1 (271-279)

Cyclin-A1 (271-279) is a synthetic peptide fragment derived from the C-terminal region of the human Cyclin-A1 protein, a member of the cyclin family integral to cell cycle regulation. As a short peptide corresponding to residues 271 through 279, it encompasses a sequence implicated in protein-protein interactions relevant to cell cycle progression and checkpoint control. Cyclin-A1 itself plays a pivotal role in regulating the transition through S phase and G2/M phases in germ cells and certain somatic tissues, making its peptide fragments valuable molecular tools for dissecting regulatory mechanisms in cell biology. The precise and defined nature of this peptide enables researchers to investigate specific functional motifs, interaction domains, and post-translational modification sites within the Cyclin-A1 protein context.

Peptide mapping: In proteomics and protein characterization studies, the 271-279 fragment of Cyclin-A1 serves as a reference standard for peptide mapping and mass spectrometric analyses. Its defined sequence allows for the validation of enzymatic digestion protocols, assessment of protein processing, and identification of Cyclin-A1-derived peptides in complex biological samples. Researchers employ this peptide as a calibration standard or as a spike-in control to enhance the specificity and sensitivity of targeted proteomic workflows.

Antibody epitope validation: The defined sequence of the Cyclin-A1 (271-279) peptide is frequently used to validate the specificity of antibodies raised against Cyclin-A1. By employing this fragment in enzyme-linked immunosorbent assays (ELISA), western blotting, or immunoprecipitation experiments, scientists can confirm antibody binding to the intended epitope. Such validation is crucial for ensuring the reliability of immunodetection methods in studies of Cyclin-A1 expression, localization, and function.

Protein interaction studies: As a motif involved in Cyclin-A1's regulatory interactions, the 271-279 peptide fragment is utilized in in vitro binding assays to probe protein-protein interactions. By immobilizing the peptide or introducing it as a competitor, investigators can map binding partners, define interaction domains, and elucidate mechanisms of cell cycle control. These studies provide insights into how Cyclin-A1 interfaces with cyclin-dependent kinases (CDKs) and other regulatory proteins during cell division.

Kinase substrate analysis: The peptide sequence corresponding to Cyclin-A1 residues 271-279 can be employed as a substrate in kinase assays to investigate post-translational modifications, such as phosphorylation. By incubating the peptide with candidate kinases, researchers can determine substrate specificity, map modification sites, and study the regulatory consequences of phosphorylation on Cyclin-A1 function. Such assays are instrumental in elucidating signaling pathways governing cell cycle checkpoints.

Peptide-based inhibitor screening: Due to its role in mediating protein interactions, the 271-279 fragment serves as a template for the design and screening of small molecules or peptides that modulate Cyclin-A1 activity. High-throughput screening platforms utilize this fragment to identify compounds that disrupt or enhance Cyclin-A1-dependent processes, supporting the discovery of novel biochemical probes for cell cycle research. The availability of this synthetic peptide thus facilitates the development of targeted modulators for fundamental studies in cell biology and biochemistry.

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