Prostate-specific antigen (165-174)

Prostate-specific antigen (165-174) is a synthetic peptide fragment derived from the prostate-specific antigen (PSA) protein, a well-characterized serine protease predominantly expressed in prostate tissue. As a defined peptide sequence corresponding to residues 165 through 174 of the PSA protein, it serves as a valuable molecular tool for investigating PSA structure, function, and immunological properties. Its application spans a variety of biochemical and molecular biology research areas, offering precise control for studies that require a specific portion of the PSA molecule. The defined nature of this peptide fragment enables researchers to dissect epitope-specific interactions, elucidate enzymatic mechanisms, and develop analytical assays relevant to PSA biology.

Epitope mapping: The 165-174 region of PSA is frequently investigated for its immunogenic potential, making this peptide fragment a useful reagent in epitope mapping studies. Researchers employ it to identify and characterize antibody binding sites within the PSA molecule, facilitating the development of monoclonal and polyclonal antibodies with high specificity. By providing a defined sequence, the peptide allows for precise determination of antigenic determinants, which is critical for both basic immunology research and the optimization of antibody-based detection platforms.

Immunoassay development: The peptide is commonly utilized as a calibration or control reagent in immunoassay systems designed to detect PSA or anti-PSA antibodies. Its well-defined sequence and synthetic origin ensure reproducibility and specificity in assay development, supporting the creation of highly sensitive and selective ELISA, western blot, or immunoprecipitation protocols. The use of PSA-derived peptides as standards or controls improves assay reliability and aids in the validation of new analytical methodologies targeting PSA detection.

T-cell response studies: As a defined antigenic epitope, the PSA (165-174) peptide is instrumental in evaluating T-cell recognition and activation in vitro. Immunologists use it to stimulate peripheral blood mononuclear cells or isolated T-cell populations, enabling the assessment of antigen-specific cellular immune responses. Such studies provide insights into the immunogenicity of PSA-derived sequences, inform vaccine design research, and enhance understanding of antigen processing and presentation pathways relevant to prostate tissue antigens.

Peptide-protein interaction analysis: The 165-174 segment offers a focused probe for exploring the molecular interactions between PSA and binding partners, including endogenous inhibitors, receptors, or other regulatory proteins. By employing this peptide in binding assays or structural studies, researchers can delineate the contribution of specific amino acid residues to protein-protein interactions, advancing knowledge of PSA's functional domains and regulatory mechanisms. Such investigations contribute to a broader understanding of serine protease biology and the molecular determinants of PSA activity.

Analytical method validation: The PSA (165-174) peptide serves as a reference standard in mass spectrometry-based assays and other analytical platforms that require precise peptide identification and quantification. Its defined structure and sequence homology to native PSA facilitate the calibration of instrumentation, the assessment of peptide recovery, and the validation of sample preparation workflows. This application supports the development of robust, reproducible analytical techniques for PSA measurement in complex biological matrices, enhancing the accuracy and reliability of protein quantification in research settings.

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3. The spatiotemporal control of signalling and trafficking of the GLP-1R

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5. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate