Inner centromere protein (48-56)

Inner centromere protein (48-56) is a synthetic peptide fragment corresponding to amino acids 48 through 56 of the inner centromere protein (INCENP), a critical component of the chromosomal passenger complex. As a peptide compound, it is widely utilized in biochemical and cell biology research to probe the structural and functional aspects of centromere activity, mitotic regulation, and chromosomal segregation. The sequence-specific nature of this peptide allows for targeted studies of protein-protein interactions, phosphorylation events, and post-translational modifications that are central to the regulation of mitosis and chromosome stability.

Peptide mapping: The use of the INCENP (48-56) fragment enables researchers to map interaction domains within the chromosomal passenger complex, particularly in dissecting the binding interfaces between INCENP and other regulatory proteins such as Aurora B kinase, Survivin, and Borealin. By introducing this peptide in binding assays or competition experiments, investigators can delineate the minimal sequence requirements for complex formation, offering insights into the molecular determinants of centromere function during cell division.

Antibody epitope characterization: This peptide fragment serves as a defined antigenic sequence for generating and validating antibodies specific to the inner centromere protein. Employing the synthetic peptide as an immunogen or as a positive control in immunoassays allows scientists to assess antibody specificity, cross-reactivity, and affinity. Such applications are crucial for the development of high-quality reagents for immunofluorescence, western blotting, and immunoprecipitation studies targeting centromere-associated proteins.

Phosphorylation studies: The defined sequence of INCENP (48-56) provides a valuable substrate for in vitro kinase assays, particularly for characterizing the phosphorylation dynamics mediated by Aurora B and related kinases. By incorporating the peptide into enzymatic assays, researchers can quantitatively assess kinase activity, substrate specificity, and the impact of post-translational modifications on centromere function. This approach supports detailed mechanistic investigations into the regulation of mitotic progression and chromosomal stability.

Peptide-functional assays: As a representative segment of the inner centromere protein, this peptide is often employed in functional assays to perturb or mimic specific protein interactions within the centromere complex. Introducing the peptide into cell-free systems or cellular extracts can competitively inhibit endogenous protein interactions, thereby elucidating the functional consequences of disrupting centromere assembly or chromosomal passenger complex activity. Such studies are instrumental in unraveling the molecular underpinnings of mitosis and chromosome segregation.

Analytical standards: The synthetic peptide also serves as a reference standard in mass spectrometry-based proteomic analyses. Its well-defined sequence and physicochemical properties make it suitable for calibrating instruments, validating peptide identification workflows, and quantifying endogenous INCENP-derived peptides in complex biological samples. Utilizing this peptide as an analytical standard enhances the reliability and reproducibility of targeted proteomic studies focused on cell division and chromosomal dynamics.

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