Classic Review,predominant egg-white protein

Ovalbumin peptides are fragments derived from ovalbumin (OVA), the most abundant protein found in egg whites, typically comprising 55-65% of the total protein content. This protein, known scientifically as Protein. Ovalbumin, is a glycoprotein with a molecular weight of approximately 43 kDa and belongs to the serpin superfamily. Its widespread presence and well-characterized nature have made ovalbumin a cornerstone in immunological studies, particularly as a model antigen. The exploration of ovalbumin peptides is crucial for understanding immune responses, developing diagnostic tools, and advancing therapeutic strategies.

Key Ovalbumin Peptides and Their Significance

Research into ovalbumin peptides has identified several specific sequences with significant immunological relevance. Among these, the OVA 323-339 peptide (ISQAVHAAHAEINEAGR) stands out. This ovalbumin protein Ova (323-339) is a well-established, major MHC class II-restricted T-cell epitope. It is frequently used for studies of immunological allergic responses such as asthma and food allergies. The Ova (323-339) peptide is an epitope of interest from the egg white albumen and is recognized for its role in eliciting immune reactions. Studies have shown that this peptide is responsible for a significant portion of isolated BALB/c mouse responses.

Another critical ovalbumin peptide is the OVA 257-264 peptide, also known as SIINFEKL. This ovalbumin-derived peptide is a class I (Kb)-restricted peptide epitope of ovalbumin (OVA). It arises from the natural processing of ovalbumin in H-2b mouse cells and is recognized by CD8+ T cells. The OVA257-264 peptide is extensively used to stimulate ovalbumin-specific T cells and to evaluate new vaccine adjuvants. It is also known to arise from natural processing of ovalbumin in H-2b mouse cells, and cytotoxic T lymphocytes (CTLs) from these mice can recognize it. The ovalbumin epitope SIINFEKL has demonstrated the ability to self-assemble, which is an area of ongoing research.

Applications of Ovalbumin Peptides in Research

The utility of ovalbumin peptides extends across various research disciplines. They are indispensable in immunology for:

* Studying T-cell Activation: Ovalbumin peptides, particularly OVA peptide (323-339), are critical in immunological studies as a model antigen for investigating CD4+ T cell activation and immune responses. The Ova (323-339) peptide binds to MHC class II molecules, facilitating T-cell recognition. Furthermore, ovalbumin(323-339) peptide binding to the major histocompatibility complex (MHC) has been shown to induce distinct T-cell responses depending on how the peptide binds.

* Allergy Research: Given that ovalbumin (OVA) is a major allergen protein present in egg whites, its derived peptides are invaluable for understanding the mechanisms of allergic sensitization and reactions. Researchers utilize these peptides to investigate IgE responses, CD4+ T cells response, immediate cutaneous hypersensitivity, and airway inflammation.

* Model Antigen for Immune Profiling: Ovalbumin itself has been used since the early 1900s as an antigen to study antibody-antigen interactions. Today, ovalbumin peptides continue to serve as a consistent and reliable model antigen, aiding in immune profiling and the development of new immunological assays.

* Vaccine Development: The ability of specific ovalbumin peptides to induce robust T-cell responses makes them useful tools for testing the efficacy of novel vaccine formulations and adjuvants.

* Inducing Immune Responses: Ovalbumin is an antigen that can be used to induce cystitis by initially sensitizing animals to the antigen and subsequently injecting it into the bladder, demonstrating its capacity to provoke localized immune reactions.

Sourcing and Characterization of Ovalbumin Peptides

Companies specializing in immunological reagents offer a range of ovalbumin peptides. These are often provided as lyophilized peptides, ensuring stability and ease of use. For instance, PepTivator Ovalbumin is a product that consists of a pool of lyophilized peptides, typically 15-mer sequences with an 11 amino acid overlap, designed for immunological stimulation.

The precise sequence and chemical properties of these ovalbumin peptides are well-documented. For example, the Ovalbumin peptide | C74H120N26O25 is identified with a specific chemical formula, and detailed information on its structure, chemical names, physical and chemical properties, classification, patents, and literature is available through resources like PubChem. The OVA 323-339 peptide (sequence: ISQAVHAAHAEINEAGR) is a **prom