Protein RER1 (UniProt:O15258)
RER1 protein (80-91) is a synthetic peptide fragment corresponding to amino acids 80 through 91 of the RER1 protein, a membrane protein involved in the retention and retrieval of endoplasmic reticulum (ER) resident proteins. This peptide segment is of particular interest in studies investigating the mechanisms of ER-Golgi trafficking, protein localization signals, and the molecular determinants of intracellular sorting. As a research tool, it enables the dissection of sequence-specific interactions and functional motifs within the RER1 protein, supporting a range of biochemical and cell biological investigations into protein quality control and membrane protein trafficking pathways.
Peptide mapping: The RER1 (80-91) peptide is valuable for peptide mapping experiments aimed at elucidating the structural and functional domains of the full-length RER1 protein. By isolating and characterizing this specific segment, researchers can identify critical motifs responsible for the protein's retention and retrieval functions within the ER-Golgi interface. Such mapping helps clarify how sequence-specific features contribute to the sorting and localization of membrane proteins, facilitating a deeper understanding of intracellular trafficking mechanisms.
Protein-protein interaction studies: This peptide serves as a defined probe for investigating the molecular interactions between RER1 and its binding partners. By using the 80-91 fragment in binding assays, pull-down experiments, or surface plasmon resonance studies, scientists can assess the affinity and specificity of interactions mediated by this region. Insights gained from these studies inform models of ER retention signal recognition and contribute to the broader understanding of protein sorting and quality control networks within the secretory pathway.
Antibody production and epitope mapping: The defined sequence of RER1 (80-91) is frequently employed as an immunogen or as a target in epitope mapping assays. Generating polyclonal or monoclonal antibodies against this peptide enables the selective detection of RER1 or its processed fragments in various biological samples. Additionally, mapping antibody recognition sites within this region aids in the development of highly specific detection reagents for immunoblotting, immunoprecipitation, or immunofluorescence applications.
Peptide-based functional assays: Incorporating the RER1 (80-91) peptide into functional assays allows researchers to dissect the contribution of this motif to ER retention and protein retrieval processes. By introducing the peptide into in vitro systems or cellular models, it becomes possible to competitively inhibit or mimic native protein interactions, thereby elucidating the mechanistic basis of RER1-mediated sorting. Such assays support the validation of sequence determinants required for proper localization and trafficking of ER-resident proteins.
Analytical standards for mass spectrometry: The well-defined nature of the RER1 (80-91) peptide makes it an excellent standard or calibration reference in mass spectrometric analyses. Its use facilitates the accurate identification and quantification of RER1-derived peptides in complex proteomic samples, supporting studies of protein expression, post-translational modifications, or degradation pathways. Employing this peptide as a standard enhances confidence in peptide identification workflows and supports rigorous proteomic investigations.
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