{"product_id":"rat-igg-fab-fragment-bhp10506048","title":"Rat IgG Fab fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat immunoglobulin G (IgG) is purified from Rat serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fab):\u003c\/strong\u003e Contains antigen-binding domains without Fc, useful for Fc-independent binding comparisons.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment antigen-binding\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eAntigen-binding comparisons that minimize Fc-mediated effects (e.g., Fc receptor engagement or complement activation).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFab fragments lack Fc-mediated interactions; binding behavior may differ from full-length IgG due to avidity and geometry changes.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052975055213,"sku":"CSB-NP006901r-10MG","price":2400.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975087981,"sku":"CSB-NP006901r-1MG","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP006901r-SDS.jpg?v=1772166487","url":"https:\/\/www.ebiohippo.com\/products\/rat-igg-fab-fragment-bhp10506048","provider":"BioHippo","version":"1.0","type":"link"}