Budget Guide,SIINFEKL, a potent immunogenic peptide

The SIINFEKL peptide is a highly significant molecule in the field of immunology, particularly for its use in studying antigen presentation and T-cell responses. Derived from chicken ovalbumin protein (Uniprot P01012), this octameric peptide sequence, OVA (257-264), is a well-characterized and immunodominant epitope. Its primary utility lies in its ability to bind to the MHC class I molecule, H-2Kb, making it an invaluable tool for researchers investigating the intricacies of the adaptive immune system.

Understanding the SIINFEKL Peptide's Significance

The SIINFEKL peptide is routinely used to stimulate ovalbumin-specific T cells, specifically CD8+ T cells. This stimulation is critical for various experimental setups, including measuring antigen presentation and assessing the efficacy of new vaccine adjuvants. Researchers often employ techniques like the ELISPOT assay to quantify peptide epitope specificity and the release of IFN-γ effector cells after stimulation with the SIINFEKL peptide. This allows for a precise understanding of how the immune system recognizes and responds to specific antigens.

One of the key aspects of the SIINFEKL peptide is its interaction with the MHC class I H-2Kb molecule. The antibody 25-D1.16 is a notable tool that specifically reacts with the ovalbumin-derived peptide SIINFEKL bound to H-2Kb of MHC class I, but not with unbound H-2Kb or other MHC molecules. This specificity makes it instrumental in visualizing and quantifying peptide-MHC complexes, further enhancing the depth of immunological studies. High-purity OVA (257-264) peptide for H-2Kb research is considered the gold standard for mouse CD8+ T cell assays and immunological models.

Applications and Variations of the SIINFEKL Peptide

The applications of the SIINFEKL peptide extend to various research areas. It is frequently used to stimulate T cells in PBMCs (peripheral blood mononuclear cells) and to monitor antigen presentation using methods to monitor antigen presentation. The SIINFEKL peptide has also been studied in the context of secreted SIINFEKL from 85B-OVA BCG, which has been shown to be presented better than cytoplasmic SIINFEKL expressed by GFP-OVA BCG. This highlights the importance of antigen localization in immune responses.

Furthermore, variations of the SIINFEKL peptide are also employed in research. For instance, the OVA G4 peptide is a variant of the agonist ovalbumin (OVA) peptide SIINFEKL (257-264). Another variant, OVA-E1 peptide TFA, acts as an antagonist to SIINFEKL [OVA (257-264)]. These variants allow researchers to probe the fine details of T-cell receptor binding and activation, providing insights into agonist and antagonist effects. The G4 peptide (SIIGFEKL) is a specific example of such a variant, differing from the canonical SIINFEKL sequence.

Practical Considerations for Using SIINFEKL Peptide

For researchers working with the SIINFEKL peptide, practical considerations such as storage are important for maintaining its integrity and efficacy. Recommendations include using a manual defrost freezer and avoiding repeated freeze-thaw cycles. For short-term storage (1-2 weeks), it can be kept at 4°C; for 12 months, at -20°C; and for long-term storage, at -80°C. The SIINFEKL peptide is a potent immunogenic peptide, playing a pivotal role in immunological studies, cancer research, and vaccine development. The molecular weight of OVA 257-264: SIINFEKL is 963.2 g/mol, with a purity of ≥ 95% (UHPLC).

In summary, the SIINFEKL peptide is a cornerstone in immunological research due to its well-defined structure, its specific binding to MHC class I H-2Kb, and its ability to elicit reliable T-cell responses. Its use in various experimental settings, coupled with the availability of specific antibodies and related variants, ensures its continued importance in advancing our understanding of immune mechanisms. The OVA 257-264 (SIINFEKL) sequence is a critical element in dissecting immune recognition, making it indispensable for researchers in immunology, vaccine development, and related fields. The SIINFEKL peptide is a peptide derived from ovalbumin (ova) widely utilized in fundamental studies of antigen processing and presentation by antigen-presenting cells.