Protein SSX4
Protein SSX4 (61-80) is a synthetic peptide fragment corresponding to amino acids 61 through 80 of the synovial sarcoma, X breakpoint 4 (SSX4) protein. This region of the SSX4 protein is of significant interest in molecular and cellular biology due to its involvement in chromatin remodeling and transcriptional regulation, as well as its association with certain oncogenic processes. The peptide serves as a valuable tool for dissecting the structure-function relationships within the SSX4 protein, enabling researchers to explore its role in gene expression and epigenetic control. By providing a defined segment of the native sequence, Protein SSX4 (61-80) facilitates targeted studies into protein-protein interactions, post-translational modifications, and immunological recognition.
Epitope mapping: The SSX4 (61-80) peptide is widely utilized in epitope mapping experiments aimed at characterizing antibody specificity and binding sites. Researchers can employ this defined peptide region to identify immunodominant epitopes within the SSX4 protein, which is particularly relevant for understanding immune recognition in the context of tumor-associated antigens. Such mapping supports the development of highly specific antibodies for research and diagnostic applications, as well as the elucidation of immune response mechanisms against SSX family proteins.
Protein interaction studies: As a discrete segment of the SSX4 sequence, this peptide is instrumental in investigating protein-protein interactions involving SSX4 and its cellular partners. By serving as a molecular probe in pull-down assays, surface plasmon resonance, or other biophysical techniques, it allows scientists to pinpoint binding interfaces and decipher the structural determinants governing SSX4's association with chromatin modifiers, transcription factors, or other regulatory proteins. These insights contribute to a deeper understanding of the molecular networks in which SSX4 participates.
Post-translational modification analysis: The 61-80 region of SSX4 may harbor potential sites for phosphorylation, acetylation, or other post-translational modifications. Synthetic peptides corresponding to this region are frequently used as substrates in in vitro modification assays, enabling the identification and functional assessment of specific modification sites. Such studies provide valuable data on how post-translational modifications influence SSX4 activity, stability, and its interaction landscape within the cell.
Structural and functional assays: The defined sequence of the SSX4 (61-80) peptide makes it suitable for structural analysis using techniques such as circular dichroism, NMR spectroscopy, or crystallography of peptide complexes. Investigating the conformational properties of this peptide fragment can reveal secondary structure elements or motifs critical for SSX4's biological function. Functional assays using the peptide also help delineate the minimal sequence requirements for specific biological activities associated with the SSX4 protein.
Immunoassay development: Due to its specificity and defined length, the SSX4 (61-80) peptide is frequently incorporated into immunoassay platforms, including ELISA and western blot protocols, as a standard or calibrator for the detection of SSX4-specific antibodies. Its use enhances assay sensitivity and specificity by providing a well-characterized antigenic determinant, supporting the accurate quantification of antibody responses in research settings. This application is essential for laboratories focused on cancer immunology, biomarker discovery, and antibody validation related to the SSX protein family.
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5. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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