Carcinoembryonic antigen-related cell adhesion molecule 5 (691-699)

Carcinoembryonic antigen-related cell adhesion molecule 5 (691-699) is a synthetic peptide fragment derived from the CEACAM5 protein, a member of the immunoglobulin superfamily prominently expressed in various epithelial tissues. This peptide sequence corresponds to amino acids 691 through 699 of the CEACAM5 molecule, a region implicated in mediating cell-cell adhesion and intercellular signaling processes. As a research tool, the peptide provides a focused means to interrogate the functional domains of CEACAM5, supporting the exploration of its structural, biochemical, and cellular roles in both normal physiology and pathological contexts. The specific sequence offers a valuable resource for studies aiming to dissect the molecular mechanisms underlying cell adhesion, signal transduction, and protein-protein interactions involving the CEACAM family.

Epitope mapping: The 691-699 peptide fragment is frequently employed in epitope mapping studies to identify antibody binding sites within the CEACAM5 protein. By using this defined sequence, researchers can generate or test monoclonal and polyclonal antibodies for specificity, affinity, and cross-reactivity. Such investigations are critical for the development of high-precision immunological reagents, which are essential in applications ranging from basic research to the creation of diagnostic assays targeting CEACAM5-expressing cells.

Protein-protein interaction studies: As a functional motif within the larger CEACAM5 molecule, this peptide serves as a model system to analyze direct and indirect interactions with binding partners. Employing the 691-699 sequence in affinity chromatography, pull-down assays, or surface plasmon resonance enables the elucidation of molecular contacts, binding affinities, and the structural determinants that govern cell adhesion processes. Insights gained from these studies contribute to a deeper understanding of CEACAM-mediated signaling networks and their regulation.

Peptide-based assay development: The synthetic peptide is a versatile standard for the design and validation of quantitative and qualitative assays. Its defined structure allows for the calibration of mass spectrometry-based detection systems, the establishment of enzyme-linked immunosorbent assays (ELISAs), and the optimization of immunodetection protocols. Such applications are vital for accurately monitoring CEACAM5-related activity, expression levels, or peptide processing events in complex biological samples.

Cellular functional analysis: Incorporation of the 691-699 peptide into in vitro cell culture experiments provides a means to investigate the biological consequences of CEACAM5 domain engagement. Researchers utilize the peptide to probe signaling pathways, modulate cell adhesion properties, or assess the impact on cellular differentiation and migration. These functional studies are instrumental in clarifying the physiological and pathological roles of specific CEACAM5 regions, advancing the understanding of epithelial cell biology.

Structural and conformational studies: The defined nine-amino-acid sequence presents a tractable system for biophysical analyses, including nuclear magnetic resonance (NMR) spectroscopy, circular dichroism, and computational modeling. Investigations using the peptide can reveal secondary structure tendencies, conformational flexibility, and critical residues responsible for molecular recognition. Such data underpin rational design efforts in peptide engineering, inhibitor development, and the creation of molecular probes targeting CEACAM5-related pathways.

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