FliC, Serotype a (427-441), S.paratyphi A

FliC, Serotype a (427-441), S.paratyphi A is a synthetic peptide fragment derived from the flagellin protein of Salmonella Paratyphi A, specifically corresponding to residues 427 to 441 of the serotype a FliC sequence. As a defined peptide epitope, it represents a conserved region of the bacterial flagellum, a structure that plays a critical role in motility and host-pathogen interactions. Its sequence specificity and immunogenic relevance make it a valuable tool for dissecting molecular recognition events, supporting a range of research applications in microbiology, immunology, and peptide-based assay development.

Epitope mapping: Researchers utilize the 427-441 fragment of FliC to pinpoint antibody binding sites within the flagellin protein, enabling the detailed characterization of host immune responses to Salmonella Paratyphi A. By employing this peptide in immunoassays such as ELISA or western blot, investigators can identify linear B-cell epitopes, facilitating the development of precise serological tools and advancing the understanding of antigenic determinants involved in bacterial recognition.

Serological assay development: The defined sequence of this peptide makes it an ideal candidate for integration into immunodiagnostic platforms aimed at detecting anti-flagellin antibodies. Its use in microarray-based or plate-based assays enhances specificity by minimizing cross-reactivity with non-homologous flagellin sequences, thereby supporting the creation of robust, sensitive detection systems for seroepidemiological studies and laboratory surveillance of Salmonella infections.

Host-pathogen interaction studies: As a representative segment of the flagellin protein, the peptide serves as a molecular probe for investigating the mechanisms by which host cells recognize and respond to bacterial motility factors. It is particularly useful in studies examining Toll-like receptor 5 (TLR5) binding or downstream signaling events, providing insight into innate immune activation pathways triggered by conserved flagellar motifs.

Peptide structure-function analysis: The FliC (427-441) fragment offers a defined model for exploring the relationship between primary sequence, secondary structure, and biological activity in flagellin-derived peptides. Structural biologists and peptide chemists can employ it in biophysical assays, such as circular dichroism or NMR spectroscopy, to assess conformational preferences and stability, thereby informing the rational design of synthetic peptides with tailored functional properties.

Antigen presentation research: The peptide's well-characterized sequence allows immunologists to investigate its processing and presentation by antigen-presenting cells in vitro. By loading the peptide onto MHC class II molecules or using it in dendritic cell activation assays, researchers can study the dynamics of T-cell recognition and the molecular basis of adaptive immune responses to Salmonella flagellin, contributing to foundational knowledge in microbial immunology and peptide antigenicity.

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